/* * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ #include #include #include #include #include #include "sdkconfig.h" #if CONFIG_LCD_ENABLE_DEBUG_LOG // The local log level must be defined before including esp_log.h // Set the maximum log level for this source file #define LOG_LOCAL_LEVEL ESP_LOG_DEBUG #endif #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/semphr.h" #include "esp_attr.h" #include "esp_check.h" #include "esp_pm.h" #include "esp_lcd_panel_interface.h" #include "esp_lcd_panel_rgb.h" #include "esp_lcd_panel_ops.h" #include "esp_rom_gpio.h" #include "soc/soc_caps.h" #include "esp_clk_tree.h" #include "hal/dma_types.h" #include "hal/gpio_hal.h" #include "esp_private/gdma.h" #include "driver/gpio.h" #include "esp_bit_defs.h" #include "esp_private/periph_ctrl.h" #include "esp_psram.h" #include "esp_lcd_common.h" #include "soc/lcd_periph.h" #include "hal/lcd_hal.h" #include "hal/lcd_ll.h" #include "hal/gdma_ll.h" #include "rom/cache.h" #include "esp_cache.h" #if CONFIG_LCD_RGB_ISR_IRAM_SAFE #define LCD_RGB_INTR_ALLOC_FLAGS (ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_INTRDISABLED) #else #define LCD_RGB_INTR_ALLOC_FLAGS ESP_INTR_FLAG_INTRDISABLED #endif #define RGB_LCD_PANEL_MAX_FB_NUM 3 // maximum supported frame buffer number #define RGB_LCD_PANEL_BOUNCE_BUF_NUM 2 // bounce buffer number #define RGB_LCD_PANEL_DMA_LINKS_REPLICA MAX(RGB_LCD_PANEL_MAX_FB_NUM, RGB_LCD_PANEL_BOUNCE_BUF_NUM) #define RGB_PANEL_SWAP_XY 0 #define RGB_PANEL_MIRROR_Y 1 #define RGB_PANEL_MIRROR_X 2 typedef enum { ROTATE_MASK_SWAP_XY = BIT(RGB_PANEL_SWAP_XY), ROTATE_MASK_MIRROR_Y = BIT(RGB_PANEL_MIRROR_Y), ROTATE_MASK_MIRROR_X = BIT(RGB_PANEL_MIRROR_X), } panel_rotate_mask_t; static const char *TAG = "lcd_panel.rgb"; typedef struct esp_rgb_panel_t esp_rgb_panel_t; static esp_err_t rgb_panel_del(esp_lcd_panel_t *panel); static esp_err_t rgb_panel_reset(esp_lcd_panel_t *panel); static esp_err_t rgb_panel_init(esp_lcd_panel_t *panel); static esp_err_t rgb_panel_draw_bitmap(esp_lcd_panel_t *panel, int x_start, int y_start, int x_end, int y_end, const void *color_data); static esp_err_t rgb_panel_invert_color(esp_lcd_panel_t *panel, bool invert_color_data); static esp_err_t rgb_panel_mirror(esp_lcd_panel_t *panel, bool mirror_x, bool mirror_y); static esp_err_t rgb_panel_swap_xy(esp_lcd_panel_t *panel, bool swap_axes); static esp_err_t rgb_panel_set_gap(esp_lcd_panel_t *panel, int x_gap, int y_gap); static esp_err_t rgb_panel_disp_on_off(esp_lcd_panel_t *panel, bool off); static esp_err_t lcd_rgb_panel_select_clock_src(esp_rgb_panel_t *panel, lcd_clock_source_t clk_src); static esp_err_t lcd_rgb_panel_create_trans_link(esp_rgb_panel_t *panel); static esp_err_t lcd_rgb_panel_configure_gpio(esp_rgb_panel_t *panel, const esp_lcd_rgb_panel_config_t *panel_config); static void lcd_rgb_panel_start_transmission(esp_rgb_panel_t *rgb_panel); static void lcd_default_isr_handler(void *args); struct esp_rgb_panel_t { esp_lcd_panel_t base; // Base class of generic lcd panel int panel_id; // LCD panel ID lcd_hal_context_t hal; // Hal layer object size_t data_width; // Number of data lines size_t fb_bits_per_pixel; // Frame buffer color depth, in bpp size_t num_fbs; // Number of frame buffers size_t output_bits_per_pixel; // Color depth seen from the output data line. Default to fb_bits_per_pixel, but can be changed by YUV-RGB conversion size_t sram_trans_align; // Alignment for framebuffer that allocated in SRAM size_t psram_trans_align; // Alignment for framebuffer that allocated in PSRAM int disp_gpio_num; // Display control GPIO, which is used to perform action like "disp_off" intr_handle_t intr; // LCD peripheral interrupt handle esp_pm_lock_handle_t pm_lock; // Power management lock size_t num_dma_nodes; // Number of DMA descriptors that used to carry the frame buffer uint8_t *fbs[RGB_LCD_PANEL_MAX_FB_NUM]; // Frame buffers uint8_t cur_fb_index; // Current frame buffer index uint8_t bb_fb_index; // Current frame buffer index which used by bounce buffer size_t fb_size; // Size of frame buffer int data_gpio_nums[SOC_LCD_RGB_DATA_WIDTH]; // GPIOs used for data lines, we keep these GPIOs for action like "invert_color" uint32_t src_clk_hz; // Peripheral source clock resolution esp_lcd_rgb_timing_t timings; // RGB timing parameters (e.g. pclk, sync pulse, porch width) size_t bb_size; // If not-zero, the driver uses two bounce buffers allocated from internal memory int bounce_pos_px; // Position in whatever source material is used for the bounce buffer, in pixels uint8_t *bounce_buffer[RGB_LCD_PANEL_BOUNCE_BUF_NUM]; // Pointer to the bounce buffers gdma_channel_handle_t dma_chan; // DMA channel handle esp_lcd_rgb_panel_vsync_cb_t on_vsync; // VSYNC event callback esp_lcd_rgb_panel_bounce_buf_fill_cb_t on_bounce_empty; // callback used to fill a bounce buffer rather than copying from the frame buffer void *user_ctx; // Reserved user's data of callback functions int x_gap; // Extra gap in x coordinate, it's used when calculate the flush window int y_gap; // Extra gap in y coordinate, it's used when calculate the flush window portMUX_TYPE spinlock; // to protect panel specific resource from concurrent access (e.g. between task and ISR) int lcd_clk_flags; // LCD clock calculation flags int rotate_mask; // panel rotate_mask mask, Or'ed of `panel_rotate_mask_t` struct { uint32_t disp_en_level: 1; // The level which can turn on the screen by `disp_gpio_num` uint32_t stream_mode: 1; // If set, the LCD transfers data continuously, otherwise, it stops refreshing the LCD when transaction done uint32_t fb_in_psram: 1; // Whether the frame buffer is in PSRAM uint32_t need_update_pclk: 1; // Whether to update the PCLK before start a new transaction uint32_t need_restart: 1; // Whether to restart the LCD controller and the DMA uint32_t bb_invalidate_cache: 1; // Whether to do cache invalidation in bounce buffer mode } flags; dma_descriptor_t *dma_links[RGB_LCD_PANEL_DMA_LINKS_REPLICA]; // fbs[0] <-> dma_links[0], fbs[1] <-> dma_links[1], etc dma_descriptor_t dma_restart_node; // DMA descriptor used to restart the transfer dma_descriptor_t dma_nodes[]; // DMA descriptors pool }; static esp_err_t lcd_rgb_panel_alloc_frame_buffers(const esp_lcd_rgb_panel_config_t *rgb_panel_config, esp_rgb_panel_t *rgb_panel) { bool fb_in_psram = false; size_t psram_trans_align = rgb_panel_config->psram_trans_align ? rgb_panel_config->psram_trans_align : 64; size_t sram_trans_align = rgb_panel_config->sram_trans_align ? rgb_panel_config->sram_trans_align : 4; rgb_panel->psram_trans_align = psram_trans_align; rgb_panel->sram_trans_align = sram_trans_align; // alloc frame buffer if (rgb_panel->num_fbs > 0) { // fb_in_psram is only an option, if there's no PSRAM on board, we fallback to alloc from SRAM if (rgb_panel_config->flags.fb_in_psram) { #if CONFIG_SPIRAM_USE_MALLOC || CONFIG_SPIRAM_USE_CAPS_ALLOC if (esp_psram_is_initialized()) { fb_in_psram = true; } #endif } for (int i = 0; i < rgb_panel->num_fbs; i++) { if (fb_in_psram) { // the low level malloc function will help check the validation of alignment rgb_panel->fbs[i] = heap_caps_aligned_calloc(psram_trans_align, 1, rgb_panel->fb_size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT); } else { rgb_panel->fbs[i] = heap_caps_aligned_calloc(sram_trans_align, 1, rgb_panel->fb_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA); } ESP_RETURN_ON_FALSE(rgb_panel->fbs[i], ESP_ERR_NO_MEM, TAG, "no mem for frame buffer"); } } // alloc bounce buffer if (rgb_panel->bb_size) { for (int i = 0; i < RGB_LCD_PANEL_BOUNCE_BUF_NUM; i++) { // bounce buffer must come from SRAM rgb_panel->bounce_buffer[i] = heap_caps_aligned_calloc(sram_trans_align, 1, rgb_panel->bb_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA); ESP_RETURN_ON_FALSE(rgb_panel->bounce_buffer[i], ESP_ERR_NO_MEM, TAG, "no mem for bounce buffer"); } } rgb_panel->cur_fb_index = 0; rgb_panel->bb_fb_index = 0; rgb_panel->flags.fb_in_psram = fb_in_psram; return ESP_OK; } static esp_err_t lcd_rgb_panel_destory(esp_rgb_panel_t *rgb_panel) { lcd_ll_enable_clock(rgb_panel->hal.dev, false); if (rgb_panel->panel_id >= 0) { periph_module_disable(lcd_periph_signals.panels[rgb_panel->panel_id].module); lcd_com_remove_device(LCD_COM_DEVICE_TYPE_RGB, rgb_panel->panel_id); } for (size_t i = 0; i < rgb_panel->num_fbs; i++) { if (rgb_panel->fbs[i]) { free(rgb_panel->fbs[i]); } } if (rgb_panel->bounce_buffer[0]) { free(rgb_panel->bounce_buffer[0]); } if (rgb_panel->bounce_buffer[1]) { free(rgb_panel->bounce_buffer[1]); } if (rgb_panel->dma_chan) { gdma_disconnect(rgb_panel->dma_chan); gdma_del_channel(rgb_panel->dma_chan); } if (rgb_panel->intr) { esp_intr_free(rgb_panel->intr); } if (rgb_panel->pm_lock) { esp_pm_lock_release(rgb_panel->pm_lock); esp_pm_lock_delete(rgb_panel->pm_lock); } free(rgb_panel); return ESP_OK; } esp_err_t esp_lcd_new_rgb_panel(const esp_lcd_rgb_panel_config_t *rgb_panel_config, esp_lcd_panel_handle_t *ret_panel) { #if CONFIG_LCD_ENABLE_DEBUG_LOG esp_log_level_set(TAG, ESP_LOG_DEBUG); #endif esp_err_t ret = ESP_OK; esp_rgb_panel_t *rgb_panel = NULL; ESP_GOTO_ON_FALSE(rgb_panel_config && ret_panel, ESP_ERR_INVALID_ARG, err, TAG, "invalid parameter"); ESP_GOTO_ON_FALSE(rgb_panel_config->data_width == 16 || rgb_panel_config->data_width == 8, ESP_ERR_NOT_SUPPORTED, err, TAG, "unsupported data width %d", rgb_panel_config->data_width); ESP_GOTO_ON_FALSE(!(rgb_panel_config->flags.double_fb && rgb_panel_config->flags.no_fb), ESP_ERR_INVALID_ARG, err, TAG, "double_fb conflicts with no_fb"); ESP_GOTO_ON_FALSE(!(rgb_panel_config->num_fbs > 0 && rgb_panel_config->num_fbs != 2 && rgb_panel_config->flags.double_fb), ESP_ERR_INVALID_ARG, err, TAG, "num_fbs conflicts with double_fb"); ESP_GOTO_ON_FALSE(!(rgb_panel_config->num_fbs > 0 && rgb_panel_config->flags.no_fb), ESP_ERR_INVALID_ARG, err, TAG, "num_fbs conflicts with no_fb"); ESP_GOTO_ON_FALSE(!(rgb_panel_config->flags.no_fb && rgb_panel_config->bounce_buffer_size_px == 0), ESP_ERR_INVALID_ARG, err, TAG, "must set bounce buffer if there's no frame buffer"); ESP_GOTO_ON_FALSE(!(rgb_panel_config->flags.refresh_on_demand && rgb_panel_config->bounce_buffer_size_px), ESP_ERR_INVALID_ARG, err, TAG, "refresh on demand is not supported under bounce buffer mode"); // determine number of framebuffers size_t num_fbs = 1; if (rgb_panel_config->flags.no_fb) { num_fbs = 0; } else if (rgb_panel_config->flags.double_fb) { num_fbs = 2; } else if (rgb_panel_config->num_fbs > 0) { num_fbs = rgb_panel_config->num_fbs; } ESP_GOTO_ON_FALSE(num_fbs <= RGB_LCD_PANEL_MAX_FB_NUM, ESP_ERR_INVALID_ARG, err, TAG, "too many frame buffers"); // bpp defaults to the number of data lines, but for serial RGB interface, they're not equal // e.g. for serial RGB 8-bit interface, data lines are 8, whereas the bpp is 24 (RGB888) size_t fb_bits_per_pixel = rgb_panel_config->data_width; if (rgb_panel_config->bits_per_pixel) { // override bpp if it's set fb_bits_per_pixel = rgb_panel_config->bits_per_pixel; } // calculate buffer size size_t fb_size = rgb_panel_config->timings.h_res * rgb_panel_config->timings.v_res * fb_bits_per_pixel / 8; size_t bb_size = rgb_panel_config->bounce_buffer_size_px * fb_bits_per_pixel / 8; if (bb_size) { // we want the bounce can always end in the second buffer ESP_GOTO_ON_FALSE(fb_size % (2 * bb_size) == 0, ESP_ERR_INVALID_ARG, err, TAG, "fb size must be even multiple of bounce buffer size"); } // calculate the number of DMA descriptors size_t num_dma_nodes = 0; if (bb_size) { // in bounce buffer mode, DMA is used to convey the bounce buffer, not the frame buffer. // frame buffer is copied to bounce buffer by CPU num_dma_nodes = (bb_size + DMA_DESCRIPTOR_BUFFER_MAX_SIZE - 1) / DMA_DESCRIPTOR_BUFFER_MAX_SIZE; } else { // Not bounce buffer mode, DMA descriptors need to fit the entire frame buffer num_dma_nodes = (fb_size + DMA_DESCRIPTOR_BUFFER_MAX_SIZE - 1) / DMA_DESCRIPTOR_BUFFER_MAX_SIZE; } // DMA descriptors must be placed in internal SRAM (requested by DMA) rgb_panel = heap_caps_calloc(1, sizeof(esp_rgb_panel_t) + num_dma_nodes * sizeof(dma_descriptor_t) * RGB_LCD_PANEL_DMA_LINKS_REPLICA, MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL); ESP_GOTO_ON_FALSE(rgb_panel, ESP_ERR_NO_MEM, err, TAG, "no mem for rgb panel"); rgb_panel->num_dma_nodes = num_dma_nodes; rgb_panel->num_fbs = num_fbs; rgb_panel->fb_size = fb_size; rgb_panel->bb_size = bb_size; rgb_panel->panel_id = -1; // register to platform int panel_id = lcd_com_register_device(LCD_COM_DEVICE_TYPE_RGB, rgb_panel); ESP_GOTO_ON_FALSE(panel_id >= 0, ESP_ERR_NOT_FOUND, err, TAG, "no free rgb panel slot"); rgb_panel->panel_id = panel_id; // enable APB to access LCD registers periph_module_enable(lcd_periph_signals.panels[panel_id].module); periph_module_reset(lcd_periph_signals.panels[panel_id].module); // allocate frame buffers + bounce buffers ESP_GOTO_ON_ERROR(lcd_rgb_panel_alloc_frame_buffers(rgb_panel_config, rgb_panel), err, TAG, "alloc frame buffers failed"); // initialize HAL layer, so we can call LL APIs later lcd_hal_init(&rgb_panel->hal, panel_id); // enable clock gating lcd_ll_enable_clock(rgb_panel->hal.dev, true); // set clock source ret = lcd_rgb_panel_select_clock_src(rgb_panel, rgb_panel_config->clk_src); ESP_GOTO_ON_ERROR(ret, err, TAG, "set source clock failed"); // set minimal PCLK divider // A limitation in the hardware, if the LCD_PCLK == LCD_CLK, then the PCLK polarity can't be adjustable if (!(rgb_panel_config->timings.flags.pclk_active_neg || rgb_panel_config->timings.flags.pclk_idle_high)) { rgb_panel->lcd_clk_flags |= LCD_HAL_PCLK_FLAG_ALLOW_EQUAL_SYSCLK; } // install interrupt service, (LCD peripheral shares the interrupt source with Camera by different mask) int isr_flags = LCD_RGB_INTR_ALLOC_FLAGS | ESP_INTR_FLAG_SHARED | ESP_INTR_FLAG_LOWMED; ret = esp_intr_alloc_intrstatus(lcd_periph_signals.panels[panel_id].irq_id, isr_flags, (uint32_t)lcd_ll_get_interrupt_status_reg(rgb_panel->hal.dev), LCD_LL_EVENT_VSYNC_END, lcd_default_isr_handler, rgb_panel, &rgb_panel->intr); ESP_GOTO_ON_ERROR(ret, err, TAG, "install interrupt failed"); lcd_ll_enable_interrupt(rgb_panel->hal.dev, LCD_LL_EVENT_VSYNC_END, false); // disable all interrupts lcd_ll_clear_interrupt_status(rgb_panel->hal.dev, UINT32_MAX); // clear pending interrupt // install DMA service rgb_panel->flags.stream_mode = !rgb_panel_config->flags.refresh_on_demand; ret = lcd_rgb_panel_create_trans_link(rgb_panel); ESP_GOTO_ON_ERROR(ret, err, TAG, "install DMA failed"); // configure GPIO ret = lcd_rgb_panel_configure_gpio(rgb_panel, rgb_panel_config); ESP_GOTO_ON_ERROR(ret, err, TAG, "configure GPIO failed"); // fill other rgb panel runtime parameters memcpy(rgb_panel->data_gpio_nums, rgb_panel_config->data_gpio_nums, SOC_LCD_RGB_DATA_WIDTH); rgb_panel->timings = rgb_panel_config->timings; rgb_panel->data_width = rgb_panel_config->data_width; rgb_panel->fb_bits_per_pixel = fb_bits_per_pixel; rgb_panel->output_bits_per_pixel = fb_bits_per_pixel; // by default, the output bpp is the same as the frame buffer bpp rgb_panel->disp_gpio_num = rgb_panel_config->disp_gpio_num; rgb_panel->flags.disp_en_level = !rgb_panel_config->flags.disp_active_low; rgb_panel->flags.bb_invalidate_cache = rgb_panel_config->flags.bb_invalidate_cache; rgb_panel->spinlock = (portMUX_TYPE)portMUX_INITIALIZER_UNLOCKED; // fill function table rgb_panel->base.del = rgb_panel_del; rgb_panel->base.reset = rgb_panel_reset; rgb_panel->base.init = rgb_panel_init; rgb_panel->base.draw_bitmap = rgb_panel_draw_bitmap; rgb_panel->base.disp_on_off = rgb_panel_disp_on_off; rgb_panel->base.invert_color = rgb_panel_invert_color; rgb_panel->base.mirror = rgb_panel_mirror; rgb_panel->base.swap_xy = rgb_panel_swap_xy; rgb_panel->base.set_gap = rgb_panel_set_gap; // return base class *ret_panel = &(rgb_panel->base); ESP_LOGD(TAG, "new rgb panel(%d) @%p, num_fbs=%zu, fb_size=%zu, bb0 @%p, bb1 @%p, bb_size=%zu", rgb_panel->panel_id, rgb_panel, rgb_panel->num_fbs, rgb_panel->fb_size, rgb_panel->bounce_buffer[0], rgb_panel->bounce_buffer[1], rgb_panel->bb_size); for (size_t i = 0; i < rgb_panel->num_fbs; i++) { ESP_LOGD(TAG, "fb[%zu] @%p", i, rgb_panel->fbs[i]); } return ESP_OK; err: if (rgb_panel) { lcd_rgb_panel_destory(rgb_panel); } return ret; } esp_err_t esp_lcd_rgb_panel_register_event_callbacks(esp_lcd_panel_handle_t panel, const esp_lcd_rgb_panel_event_callbacks_t *callbacks, void *user_ctx) { ESP_RETURN_ON_FALSE(panel && callbacks, ESP_ERR_INVALID_ARG, TAG, "invalid argument"); esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); #if CONFIG_LCD_RGB_ISR_IRAM_SAFE if (callbacks->on_vsync) { ESP_RETURN_ON_FALSE(esp_ptr_in_iram(callbacks->on_vsync), ESP_ERR_INVALID_ARG, TAG, "on_vsync callback not in IRAM"); } if (callbacks->on_bounce_empty) { ESP_RETURN_ON_FALSE(esp_ptr_in_iram(callbacks->on_bounce_empty), ESP_ERR_INVALID_ARG, TAG, "on_bounce_empty callback not in IRAM"); } if (user_ctx) { ESP_RETURN_ON_FALSE(esp_ptr_internal(user_ctx), ESP_ERR_INVALID_ARG, TAG, "user context not in internal RAM"); } #endif // CONFIG_LCD_RGB_ISR_IRAM_SAFE rgb_panel->on_vsync = callbacks->on_vsync; rgb_panel->on_bounce_empty = callbacks->on_bounce_empty; rgb_panel->user_ctx = user_ctx; return ESP_OK; } esp_err_t esp_lcd_rgb_panel_set_pclk(esp_lcd_panel_handle_t panel, uint32_t freq_hz) { ESP_RETURN_ON_FALSE(panel, ESP_ERR_INVALID_ARG, TAG, "invalid argument"); esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); // the pclk frequency will be updated in the `LCD_LL_EVENT_VSYNC_END` event handler portENTER_CRITICAL(&rgb_panel->spinlock); rgb_panel->flags.need_update_pclk = true; rgb_panel->timings.pclk_hz = freq_hz; portEXIT_CRITICAL(&rgb_panel->spinlock); return ESP_OK; } esp_err_t esp_lcd_rgb_panel_restart(esp_lcd_panel_handle_t panel) { ESP_RETURN_ON_FALSE(panel, ESP_ERR_INVALID_ARG, TAG, "invalid argument"); esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); ESP_RETURN_ON_FALSE(rgb_panel->flags.stream_mode, ESP_ERR_INVALID_STATE, TAG, "not in stream mode"); // the underlying restart job will be done in the `LCD_LL_EVENT_VSYNC_END` event handler portENTER_CRITICAL(&rgb_panel->spinlock); rgb_panel->flags.need_restart = true; portEXIT_CRITICAL(&rgb_panel->spinlock); return ESP_OK; } esp_err_t esp_lcd_rgb_panel_get_frame_buffer(esp_lcd_panel_handle_t panel, uint32_t fb_num, void **fb0, ...) { ESP_RETURN_ON_FALSE(panel, ESP_ERR_INVALID_ARG, TAG, "invalid argument"); esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); ESP_RETURN_ON_FALSE(fb_num && fb_num <= rgb_panel->num_fbs, ESP_ERR_INVALID_ARG, TAG, "invalid frame buffer number"); void **fb_itor = fb0; va_list args; va_start(args, fb0); for (int i = 0; i < fb_num; i++) { if (fb_itor) { *fb_itor = rgb_panel->fbs[i]; fb_itor = va_arg(args, void **); } } va_end(args); return ESP_OK; } esp_err_t esp_lcd_rgb_panel_refresh(esp_lcd_panel_handle_t panel) { ESP_RETURN_ON_FALSE(panel, ESP_ERR_INVALID_ARG, TAG, "invalid argument"); esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); ESP_RETURN_ON_FALSE(!rgb_panel->flags.stream_mode, ESP_ERR_INVALID_STATE, TAG, "refresh on demand is not enabled"); lcd_rgb_panel_start_transmission(rgb_panel); return ESP_OK; } esp_err_t esp_lcd_rgb_panel_set_yuv_conversion(esp_lcd_panel_handle_t panel, const esp_lcd_yuv_conv_config_t *config) { ESP_RETURN_ON_FALSE(panel, ESP_ERR_INVALID_ARG, TAG, "invalid argument"); esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); lcd_hal_context_t *hal = &rgb_panel->hal; bool en_conversion = config != NULL; // bits per pixel for different YUV sample const uint8_t bpp_yuv[] = { [LCD_YUV_SAMPLE_422] = 16, [LCD_YUV_SAMPLE_420] = 12, [LCD_YUV_SAMPLE_411] = 12, }; if (en_conversion) { if (memcmp(&config->src, &config->dst, sizeof(config->src)) == 0) { ESP_RETURN_ON_FALSE(false, ESP_ERR_INVALID_ARG, TAG, "conversion source and destination are the same"); } if (config->src.color_space == LCD_COLOR_SPACE_YUV && config->dst.color_space == LCD_COLOR_SPACE_RGB) { // YUV->RGB lcd_ll_set_convert_mode_yuv_to_rgb(hal->dev, config->src.yuv_sample); // Note, the RGB->YUV conversion only support RGB565 rgb_panel->output_bits_per_pixel = 16; } else if (config->src.color_space == LCD_COLOR_SPACE_RGB && config->dst.color_space == LCD_COLOR_SPACE_YUV) { // RGB->YUV lcd_ll_set_convert_mode_rgb_to_yuv(hal->dev, config->dst.yuv_sample); rgb_panel->output_bits_per_pixel = bpp_yuv[config->dst.yuv_sample]; } else if (config->src.color_space == LCD_COLOR_SPACE_YUV && config->dst.color_space == LCD_COLOR_SPACE_YUV) { // YUV->YUV lcd_ll_set_convert_mode_yuv_to_yuv(hal->dev, config->src.yuv_sample, config->dst.yuv_sample); rgb_panel->output_bits_per_pixel = bpp_yuv[config->dst.yuv_sample]; } else { ESP_RETURN_ON_FALSE(false, ESP_ERR_NOT_SUPPORTED, TAG, "unsupported conversion mode"); } // set conversion standard lcd_ll_set_yuv_convert_std(hal->dev, config->std); // set conversion data width lcd_ll_set_convert_data_width(hal->dev, rgb_panel->data_width); // set color range lcd_ll_set_input_color_range(hal->dev, config->src.color_range); lcd_ll_set_output_color_range(hal->dev, config->dst.color_range); } else { // output bpp equals to frame buffer bpp rgb_panel->output_bits_per_pixel = rgb_panel->fb_bits_per_pixel; } // enable or disable RGB-YUV conversion lcd_ll_enable_rgb_yuv_convert(hal->dev, en_conversion); return ESP_OK; } static esp_err_t rgb_panel_del(esp_lcd_panel_t *panel) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); int panel_id = rgb_panel->panel_id; ESP_RETURN_ON_ERROR(lcd_rgb_panel_destory(rgb_panel), TAG, "destroy rgb panel(%d) failed", panel_id); ESP_LOGD(TAG, "del rgb panel(%d)", panel_id); return ESP_OK; } static esp_err_t rgb_panel_reset(esp_lcd_panel_t *panel) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); lcd_ll_fifo_reset(rgb_panel->hal.dev); lcd_ll_reset(rgb_panel->hal.dev); return ESP_OK; } static esp_err_t rgb_panel_init(esp_lcd_panel_t *panel) { esp_err_t ret = ESP_OK; esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); // set pixel clock frequency rgb_panel->timings.pclk_hz = lcd_hal_cal_pclk_freq(&rgb_panel->hal, rgb_panel->src_clk_hz, rgb_panel->timings.pclk_hz, rgb_panel->lcd_clk_flags); // pixel clock phase and polarity lcd_ll_set_clock_idle_level(rgb_panel->hal.dev, rgb_panel->timings.flags.pclk_idle_high); lcd_ll_set_pixel_clock_edge(rgb_panel->hal.dev, rgb_panel->timings.flags.pclk_active_neg); // enable RGB mode and set data width lcd_ll_enable_rgb_mode(rgb_panel->hal.dev, true); lcd_ll_set_data_width(rgb_panel->hal.dev, rgb_panel->data_width); lcd_ll_set_phase_cycles(rgb_panel->hal.dev, 0, 0, 1); // enable data phase only // number of data cycles is controlled by DMA buffer size lcd_ll_enable_output_always_on(rgb_panel->hal.dev, true); // configure HSYNC, VSYNC, DE signal idle state level lcd_ll_set_idle_level(rgb_panel->hal.dev, !rgb_panel->timings.flags.hsync_idle_low, !rgb_panel->timings.flags.vsync_idle_low, rgb_panel->timings.flags.de_idle_high); // configure blank region timing lcd_ll_set_blank_cycles(rgb_panel->hal.dev, 1, 1); // RGB panel always has a front and back blank (porch region) lcd_ll_set_horizontal_timing(rgb_panel->hal.dev, rgb_panel->timings.hsync_pulse_width, rgb_panel->timings.hsync_back_porch, rgb_panel->timings.h_res * rgb_panel->output_bits_per_pixel / rgb_panel->data_width, rgb_panel->timings.hsync_front_porch); lcd_ll_set_vertical_timing(rgb_panel->hal.dev, rgb_panel->timings.vsync_pulse_width, rgb_panel->timings.vsync_back_porch, rgb_panel->timings.v_res, rgb_panel->timings.vsync_front_porch); // output hsync even in porch region lcd_ll_enable_output_hsync_in_porch_region(rgb_panel->hal.dev, true); // generate the hsync at the very beginning of line lcd_ll_set_hsync_position(rgb_panel->hal.dev, 0); // send next frame automatically in stream mode lcd_ll_enable_auto_next_frame(rgb_panel->hal.dev, rgb_panel->flags.stream_mode); // trigger interrupt on the end of frame lcd_ll_enable_interrupt(rgb_panel->hal.dev, LCD_LL_EVENT_VSYNC_END, true); // enable intr esp_intr_enable(rgb_panel->intr); // start transmission if (rgb_panel->flags.stream_mode) { lcd_rgb_panel_start_transmission(rgb_panel); } ESP_LOGD(TAG, "rgb panel(%d) start, pclk=%"PRIu32"Hz", rgb_panel->panel_id, rgb_panel->timings.pclk_hz); return ret; } __attribute__((always_inline)) static inline void copy_pixel_8bpp(uint8_t *to, const uint8_t *from) { *to++ = *from++; } __attribute__((always_inline)) static inline void copy_pixel_16bpp(uint8_t *to, const uint8_t *from) { *to++ = *from++; *to++ = *from++; } __attribute__((always_inline)) static inline void copy_pixel_24bpp(uint8_t *to, const uint8_t *from) { *to++ = *from++; *to++ = *from++; *to++ = *from++; } #define COPY_PIXEL_CODE_BLOCK(_bpp) \ switch (rgb_panel->rotate_mask) \ { \ case 0: \ { \ uint8_t *to = fb + (y_start * h_res + x_start) * bytes_per_pixel; \ for (int y = y_start; y < y_end; y++) \ { \ memcpy(to, from, copy_bytes_per_line); \ to += bytes_per_line; \ from += copy_bytes_per_line; \ } \ bytes_to_flush = (y_end - y_start) * bytes_per_line; \ flush_ptr = fb + y_start * bytes_per_line; \ } \ break; \ case ROTATE_MASK_MIRROR_X: \ for (int y = y_start; y < y_end; y++) \ { \ uint32_t index = (y * h_res + (h_res - 1 - x_start)) * bytes_per_pixel; \ for (size_t x = x_start; x < x_end; x++) \ { \ copy_pixel_##_bpp##bpp(to + index, from); \ index -= bytes_per_pixel; \ from += bytes_per_pixel; \ } \ } \ bytes_to_flush = (y_end - y_start) * bytes_per_line; \ flush_ptr = fb + y_start * bytes_per_line; \ break; \ case ROTATE_MASK_MIRROR_Y: \ { \ uint8_t *to = fb + ((v_res - 1 - y_start) * h_res + x_start) * bytes_per_pixel; \ for (int y = y_start; y < y_end; y++) \ { \ memcpy(to, from, copy_bytes_per_line); \ to -= bytes_per_line; \ from += copy_bytes_per_line; \ } \ bytes_to_flush = (y_end - y_start) * bytes_per_line; \ flush_ptr = fb + (v_res - y_end) * bytes_per_line; \ } \ break; \ case ROTATE_MASK_MIRROR_X | ROTATE_MASK_MIRROR_Y: \ for (int y = y_start; y < y_end; y++) \ { \ uint32_t index = ((v_res - 1 - y) * h_res + (h_res - 1 - x_start)) * bytes_per_pixel; \ for (size_t x = x_start; x < x_end; x++) \ { \ copy_pixel_##_bpp##bpp(to + index, from); \ index -= bytes_per_pixel; \ from += bytes_per_pixel; \ } \ } \ bytes_to_flush = (y_end - y_start) * bytes_per_line; \ flush_ptr = fb + (v_res - y_end) * bytes_per_line; \ break; \ case ROTATE_MASK_SWAP_XY: \ for (int y = y_start; y < y_end; y++) \ { \ for (int x = x_start; x < x_end; x++) \ { \ uint32_t j = y * copy_bytes_per_line + x * bytes_per_pixel - offset; \ uint32_t i = (x * h_res + y) * bytes_per_pixel; \ copy_pixel_##_bpp##bpp(to + i, from + j); \ } \ } \ bytes_to_flush = (x_end - x_start) * bytes_per_line; \ flush_ptr = fb + x_start * bytes_per_line; \ break; \ case ROTATE_MASK_SWAP_XY | ROTATE_MASK_MIRROR_X: \ for (int y = y_start; y < y_end; y++) \ { \ for (int x = x_start; x < x_end; x++) \ { \ uint32_t j = y * copy_bytes_per_line + x * bytes_per_pixel - offset; \ uint32_t i = (x * h_res + h_res - 1 - y) * bytes_per_pixel; \ copy_pixel_##_bpp##bpp(to + i, from + j); \ } \ } \ bytes_to_flush = (x_end - x_start) * bytes_per_line; \ flush_ptr = fb + x_start * bytes_per_line; \ break; \ case ROTATE_MASK_SWAP_XY | ROTATE_MASK_MIRROR_Y: \ for (int y = y_start; y < y_end; y++) \ { \ for (int x = x_start; x < x_end; x++) \ { \ uint32_t j = y * copy_bytes_per_line + x * bytes_per_pixel - offset; \ uint32_t i = ((v_res - 1 - x) * h_res + y) * bytes_per_pixel; \ copy_pixel_##_bpp##bpp(to + i, from + j); \ } \ } \ bytes_to_flush = (x_end - x_start) * bytes_per_line; \ flush_ptr = fb + (v_res - x_end) * bytes_per_line; \ break; \ case ROTATE_MASK_SWAP_XY | ROTATE_MASK_MIRROR_X | ROTATE_MASK_MIRROR_Y: \ for (int y = y_start; y < y_end; y++) \ { \ for (int x = x_start; x < x_end; x++) \ { \ uint32_t j = y * copy_bytes_per_line + x * bytes_per_pixel - offset; \ uint32_t i = ((v_res - 1 - x) * h_res + h_res - 1 - y) * bytes_per_pixel; \ copy_pixel_##_bpp##bpp(to + i, from + j); \ } \ } \ bytes_to_flush = (x_end - x_start) * bytes_per_line; \ flush_ptr = fb + (v_res - x_end) * bytes_per_line; \ break; \ default: \ break; \ } static esp_err_t rgb_panel_draw_bitmap(esp_lcd_panel_t *panel, int x_start, int y_start, int x_end, int y_end, const void *color_data) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); ESP_RETURN_ON_FALSE(rgb_panel->num_fbs > 0, ESP_ERR_NOT_SUPPORTED, TAG, "no frame buffer installed"); assert((x_start < x_end) && (y_start < y_end) && "start position must be smaller than end position"); // check if we need to copy the draw buffer (pointed by the color_data) to the driver's frame buffer bool do_copy = false; if (color_data == rgb_panel->fbs[0]) { rgb_panel->cur_fb_index = 0; } else if (color_data == rgb_panel->fbs[1]) { rgb_panel->cur_fb_index = 1; } else if (color_data == rgb_panel->fbs[2]) { rgb_panel->cur_fb_index = 2; } else { // we do the copy only if the color_data is different from either frame buffer do_copy = true; } // adjust the flush window by adding extra gap x_start += rgb_panel->x_gap; y_start += rgb_panel->y_gap; x_end += rgb_panel->x_gap; y_end += rgb_panel->y_gap; // round the boundary int h_res = rgb_panel->timings.h_res; int v_res = rgb_panel->timings.v_res; if (rgb_panel->rotate_mask & ROTATE_MASK_SWAP_XY) { x_start = MIN(x_start, v_res); x_end = MIN(x_end, v_res); y_start = MIN(y_start, h_res); y_end = MIN(y_end, h_res); } else { x_start = MIN(x_start, h_res); x_end = MIN(x_end, h_res); y_start = MIN(y_start, v_res); y_end = MIN(y_end, v_res); } int bytes_per_pixel = rgb_panel->fb_bits_per_pixel / 8; int pixels_per_line = rgb_panel->timings.h_res; uint32_t bytes_per_line = bytes_per_pixel * pixels_per_line; uint8_t *fb = rgb_panel->fbs[rgb_panel->cur_fb_index]; size_t bytes_to_flush = v_res * h_res * bytes_per_pixel; uint8_t *flush_ptr = fb; if (do_copy) { // copy the UI draw buffer into internal frame buffer const uint8_t *from = (const uint8_t *)color_data; uint32_t copy_bytes_per_line = (x_end - x_start) * bytes_per_pixel; size_t offset = y_start * copy_bytes_per_line + x_start * bytes_per_pixel; uint8_t *to = fb; if (1 == bytes_per_pixel) { COPY_PIXEL_CODE_BLOCK(8) } else if (2 == bytes_per_pixel) { COPY_PIXEL_CODE_BLOCK(16) } else if (3 == bytes_per_pixel) { COPY_PIXEL_CODE_BLOCK(24) } } // Note that if we use a bounce buffer, the data gets read by the CPU as well so no need to write back if (rgb_panel->flags.fb_in_psram && !rgb_panel->bb_size) { // CPU writes data to PSRAM through DCache, data in PSRAM might not get updated, so write back ESP_RETURN_ON_ERROR(esp_cache_msync(flush_ptr, bytes_to_flush, 0), TAG, "flush cache buffer failed"); } if (!rgb_panel->bb_size) { if (rgb_panel->flags.stream_mode) { // the DMA will convey the new frame buffer next time for (int i = 0; i < RGB_LCD_PANEL_DMA_LINKS_REPLICA; i++) { rgb_panel->dma_nodes[rgb_panel->num_dma_nodes * (i + 1) - 1].next = rgb_panel->dma_links[rgb_panel->cur_fb_index]; } } } return ESP_OK; } static esp_err_t rgb_panel_invert_color(esp_lcd_panel_t *panel, bool invert_color_data) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); int panel_id = rgb_panel->panel_id; // inverting the data line by GPIO matrix for (int i = 0; i < rgb_panel->data_width; i++) { esp_rom_gpio_connect_out_signal(rgb_panel->data_gpio_nums[i], lcd_periph_signals.panels[panel_id].data_sigs[i], invert_color_data, false); } return ESP_OK; } static esp_err_t rgb_panel_mirror(esp_lcd_panel_t *panel, bool mirror_x, bool mirror_y) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); rgb_panel->rotate_mask &= ~(ROTATE_MASK_MIRROR_X | ROTATE_MASK_MIRROR_Y); rgb_panel->rotate_mask |= (mirror_x << RGB_PANEL_MIRROR_X | mirror_y << RGB_PANEL_MIRROR_Y); return ESP_OK; } static esp_err_t rgb_panel_swap_xy(esp_lcd_panel_t *panel, bool swap_axes) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); rgb_panel->rotate_mask &= ~(ROTATE_MASK_SWAP_XY); rgb_panel->rotate_mask |= swap_axes << RGB_PANEL_SWAP_XY; return ESP_OK; } static esp_err_t rgb_panel_set_gap(esp_lcd_panel_t *panel, int x_gap, int y_gap) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); rgb_panel->x_gap = x_gap; rgb_panel->y_gap = y_gap; return ESP_OK; } static esp_err_t rgb_panel_disp_on_off(esp_lcd_panel_t *panel, bool on_off) { esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base); if (rgb_panel->disp_gpio_num < 0) { return ESP_ERR_NOT_SUPPORTED; } if (!on_off) { // turn off screen gpio_set_level(rgb_panel->disp_gpio_num, !rgb_panel->flags.disp_en_level); } else { // turn on screen gpio_set_level(rgb_panel->disp_gpio_num, rgb_panel->flags.disp_en_level); } return ESP_OK; } static esp_err_t lcd_rgb_panel_configure_gpio(esp_rgb_panel_t *panel, const esp_lcd_rgb_panel_config_t *panel_config) { int panel_id = panel->panel_id; // check validation of GPIO number bool valid_gpio = true; if (panel_config->de_gpio_num < 0) { // Hsync and Vsync are required in HV mode valid_gpio = valid_gpio && (panel_config->hsync_gpio_num >= 0) && (panel_config->vsync_gpio_num >= 0); } for (size_t i = 0; i < panel_config->data_width; i++) { valid_gpio = valid_gpio && (panel_config->data_gpio_nums[i] >= 0); } if (!valid_gpio) { return ESP_ERR_INVALID_ARG; } // connect peripheral signals via GPIO matrix for (size_t i = 0; i < panel_config->data_width; i++) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[panel_config->data_gpio_nums[i]], PIN_FUNC_GPIO); gpio_set_direction(panel_config->data_gpio_nums[i], GPIO_MODE_OUTPUT); esp_rom_gpio_connect_out_signal(panel_config->data_gpio_nums[i], lcd_periph_signals.panels[panel_id].data_sigs[i], false, false); } if (panel_config->hsync_gpio_num >= 0) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[panel_config->hsync_gpio_num], PIN_FUNC_GPIO); gpio_set_direction(panel_config->hsync_gpio_num, GPIO_MODE_OUTPUT); esp_rom_gpio_connect_out_signal(panel_config->hsync_gpio_num, lcd_periph_signals.panels[panel_id].hsync_sig, false, false); } if (panel_config->vsync_gpio_num >= 0) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[panel_config->vsync_gpio_num], PIN_FUNC_GPIO); gpio_set_direction(panel_config->vsync_gpio_num, GPIO_MODE_OUTPUT); esp_rom_gpio_connect_out_signal(panel_config->vsync_gpio_num, lcd_periph_signals.panels[panel_id].vsync_sig, false, false); } // PCLK may not be necessary in some cases (i.e. VGA output) if (panel_config->pclk_gpio_num >= 0) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[panel_config->pclk_gpio_num], PIN_FUNC_GPIO); gpio_set_direction(panel_config->pclk_gpio_num, GPIO_MODE_OUTPUT); esp_rom_gpio_connect_out_signal(panel_config->pclk_gpio_num, lcd_periph_signals.panels[panel_id].pclk_sig, false, false); } // DE signal might not be necessary for some RGB LCD if (panel_config->de_gpio_num >= 0) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[panel_config->de_gpio_num], PIN_FUNC_GPIO); gpio_set_direction(panel_config->de_gpio_num, GPIO_MODE_OUTPUT); esp_rom_gpio_connect_out_signal(panel_config->de_gpio_num, lcd_periph_signals.panels[panel_id].de_sig, false, false); } // disp enable GPIO is optional if (panel_config->disp_gpio_num >= 0) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[panel_config->disp_gpio_num], PIN_FUNC_GPIO); gpio_set_direction(panel_config->disp_gpio_num, GPIO_MODE_OUTPUT); esp_rom_gpio_connect_out_signal(panel_config->disp_gpio_num, SIG_GPIO_OUT_IDX, false, false); } return ESP_OK; } static esp_err_t lcd_rgb_panel_select_clock_src(esp_rgb_panel_t *panel, lcd_clock_source_t clk_src) { // get clock source frequency uint32_t src_clk_hz = 0; ESP_RETURN_ON_ERROR(esp_clk_tree_src_get_freq_hz((soc_module_clk_t)clk_src, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &src_clk_hz), TAG, "get clock source frequency failed"); panel->src_clk_hz = src_clk_hz; lcd_ll_select_clk_src(panel->hal.dev, clk_src); // create pm lock based on different clock source // clock sources like PLL and XTAL will be turned off in light sleep #if CONFIG_PM_ENABLE ESP_RETURN_ON_ERROR(esp_pm_lock_create(ESP_PM_NO_LIGHT_SLEEP, 0, "rgb_panel", &panel->pm_lock), TAG, "create pm lock failed"); // hold the lock during the whole lifecycle of RGB panel esp_pm_lock_acquire(panel->pm_lock); ESP_LOGD(TAG, "installed pm lock and hold the lock during the whole panel lifecycle"); #endif return ESP_OK; } static IRAM_ATTR bool lcd_rgb_panel_fill_bounce_buffer(esp_rgb_panel_t *panel, uint8_t *buffer) { bool need_yield = false; int bytes_per_pixel = panel->fb_bits_per_pixel / 8; if (panel->num_fbs == 0) { if (panel->on_bounce_empty) { // We don't have a frame buffer here; we need to call a callback to refill the bounce buffer need_yield = panel->on_bounce_empty(&panel->base, buffer, panel->bounce_pos_px, panel->bb_size, panel->user_ctx); } } else { // We do have frame buffer; copy from there. // Note: if the cache is diabled, and accessing the PSRAM by DCACHE will crash. memcpy(buffer, &panel->fbs[panel->bb_fb_index][panel->bounce_pos_px * bytes_per_pixel], panel->bb_size); if (panel->flags.bb_invalidate_cache) { // We don't need the bytes we copied from the psram anymore // Make sure that if anything happened to have changed (because the line already was in cache) we write the data back. esp_cache_msync(&panel->fbs[panel->bb_fb_index][panel->bounce_pos_px * bytes_per_pixel], (size_t)panel->bb_size, ESP_CACHE_MSYNC_FLAG_INVALIDATE); } } panel->bounce_pos_px += panel->bb_size / bytes_per_pixel; // If the bounce pos is larger than the frame buffer size, wrap around so the next isr starts pre-loading the next frame. if (panel->bounce_pos_px >= panel->fb_size / bytes_per_pixel) { panel->bounce_pos_px = 0; panel->bb_fb_index = panel->cur_fb_index; } if (panel->num_fbs > 0) { // Preload the next bit of buffer from psram Cache_Start_DCache_Preload((uint32_t)&panel->fbs[panel->bb_fb_index][panel->bounce_pos_px * bytes_per_pixel], panel->bb_size, 0); } return need_yield; } // This is called in bounce buffer mode, when one bounce buffer has been fully sent to the LCD peripheral. static IRAM_ATTR bool lcd_rgb_panel_eof_handler(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data) { esp_rgb_panel_t *panel = (esp_rgb_panel_t *)user_data; dma_descriptor_t *desc = (dma_descriptor_t *)event_data->tx_eof_desc_addr; // Figure out which bounce buffer to write to. // Note: what we receive is the *last* descriptor of this bounce buffer. int bb = (desc == &panel->dma_nodes[panel->num_dma_nodes - 1]) ? 0 : 1; return lcd_rgb_panel_fill_bounce_buffer(panel, panel->bounce_buffer[bb]); } // If we restart GDMA, many pixels already have been transferred to the LCD peripheral. // Looks like that has 16 pixels of FIFO plus one holding register. #define LCD_FIFO_PRESERVE_SIZE_PX (GDMA_LL_L2FIFO_BASE_SIZE + 1) static esp_err_t lcd_rgb_panel_create_trans_link(esp_rgb_panel_t *panel) { for (int i = 0; i < RGB_LCD_PANEL_DMA_LINKS_REPLICA; i++) { panel->dma_links[i] = &panel->dma_nodes[panel->num_dma_nodes * i]; } // chain DMA descriptors for (int i = 0; i < panel->num_dma_nodes * RGB_LCD_PANEL_DMA_LINKS_REPLICA; i++) { panel->dma_nodes[i].dw0.owner = DMA_DESCRIPTOR_BUFFER_OWNER_CPU; panel->dma_nodes[i].next = &panel->dma_nodes[i + 1]; } if (panel->bb_size) { // loop end back to start panel->dma_nodes[panel->num_dma_nodes * RGB_LCD_PANEL_BOUNCE_BUF_NUM - 1].next = &panel->dma_nodes[0]; // mount the bounce buffers to the DMA descriptors lcd_com_mount_dma_data(panel->dma_links[0], panel->bounce_buffer[0], panel->bb_size); lcd_com_mount_dma_data(panel->dma_links[1], panel->bounce_buffer[1], panel->bb_size); } else { if (panel->flags.stream_mode) { // circle DMA descriptors chain for each frame buffer for (int i = 0; i < RGB_LCD_PANEL_DMA_LINKS_REPLICA; i++) { panel->dma_nodes[panel->num_dma_nodes * (i + 1) - 1].next = &panel->dma_nodes[panel->num_dma_nodes * i]; } } else { // one-off DMA descriptors chain for (int i = 0; i < RGB_LCD_PANEL_DMA_LINKS_REPLICA; i++) { panel->dma_nodes[panel->num_dma_nodes * (i + 1) - 1].next = NULL; } } // mount the frame buffer to the DMA descriptors for (size_t i = 0; i < panel->num_fbs; i++) { lcd_com_mount_dma_data(panel->dma_links[i], panel->fbs[i], panel->fb_size); } } // On restart, the data sent to the LCD peripheral needs to start LCD_FIFO_PRESERVE_SIZE_PX pixels after the FB start // so we use a dedicated DMA node to restart the DMA transaction // see also `lcd_rgb_panel_try_restart_transmission` memcpy(&panel->dma_restart_node, &panel->dma_nodes[0], sizeof(panel->dma_restart_node)); int restart_skip_bytes = LCD_FIFO_PRESERVE_SIZE_PX * sizeof(uint16_t); uint8_t *p = (uint8_t *)panel->dma_restart_node.buffer; panel->dma_restart_node.buffer = &p[restart_skip_bytes]; panel->dma_restart_node.dw0.length -= restart_skip_bytes; panel->dma_restart_node.dw0.size -= restart_skip_bytes; // alloc DMA channel and connect to LCD peripheral gdma_channel_alloc_config_t dma_chan_config = { .direction = GDMA_CHANNEL_DIRECTION_TX, }; ESP_RETURN_ON_ERROR(gdma_new_channel(&dma_chan_config, &panel->dma_chan), TAG, "alloc DMA channel failed"); gdma_connect(panel->dma_chan, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_LCD, 0)); gdma_transfer_ability_t ability = { .psram_trans_align = panel->psram_trans_align, .sram_trans_align = panel->sram_trans_align, }; gdma_set_transfer_ability(panel->dma_chan, &ability); // we need to refill the bounce buffer in the DMA EOF interrupt, so only register the callback for bounce buffer mode if (panel->bb_size) { gdma_tx_event_callbacks_t cbs = { .on_trans_eof = lcd_rgb_panel_eof_handler, }; gdma_register_tx_event_callbacks(panel->dma_chan, &cbs, panel); } return ESP_OK; } // reset the GDMA channel every VBlank to stop permanent desyncs from happening. // Note that this fix can lead to single-frame desyncs itself, as in: if this interrupt // is late enough, the display will shift as the LCD controller already read out the // first data bytes, and resetting DMA will re-send those. However, the single-frame // desync this leads to is preferable to the permanent desync that could otherwise // happen. It's also not super-likely as this interrupt has the entirety of the VBlank // time to reset DMA. static IRAM_ATTR void lcd_rgb_panel_try_restart_transmission(esp_rgb_panel_t *panel) { bool do_restart = false; #if CONFIG_LCD_RGB_RESTART_IN_VSYNC do_restart = true; #else portENTER_CRITICAL_ISR(&panel->spinlock); if (panel->flags.need_restart) { panel->flags.need_restart = false; do_restart = true; } portEXIT_CRITICAL_ISR(&panel->spinlock); #endif // CONFIG_LCD_RGB_RESTART_IN_VSYNC if (!do_restart) { return; } if (panel->bb_size) { // Catch de-synced frame buffer and reset if needed. if (panel->bounce_pos_px > panel->bb_size) { panel->bounce_pos_px = 0; } // Pre-fill bounce buffer 0, if the EOF ISR didn't do that already if (panel->bounce_pos_px < panel->bb_size / 2) { lcd_rgb_panel_fill_bounce_buffer(panel, panel->bounce_buffer[0]); } } gdma_reset(panel->dma_chan); // restart the DMA by a special DMA node gdma_start(panel->dma_chan, (intptr_t)&panel->dma_restart_node); if (panel->bb_size) { // Fill 2nd bounce buffer while 1st is being sent out, if needed. if (panel->bounce_pos_px < panel->bb_size) { lcd_rgb_panel_fill_bounce_buffer(panel, panel->bounce_buffer[0]); } } } static void lcd_rgb_panel_start_transmission(esp_rgb_panel_t *rgb_panel) { // reset FIFO of DMA and LCD, incase there remains old frame data gdma_reset(rgb_panel->dma_chan); lcd_ll_stop(rgb_panel->hal.dev); lcd_ll_fifo_reset(rgb_panel->hal.dev); // pre-fill bounce buffers if needed if (rgb_panel->bb_size) { rgb_panel->bounce_pos_px = 0; lcd_rgb_panel_fill_bounce_buffer(rgb_panel, rgb_panel->bounce_buffer[0]); lcd_rgb_panel_fill_bounce_buffer(rgb_panel, rgb_panel->bounce_buffer[1]); } // the start of DMA should be prior to the start of LCD engine gdma_start(rgb_panel->dma_chan, (intptr_t)rgb_panel->dma_links[rgb_panel->cur_fb_index]); // delay 1us is sufficient for DMA to pass data to LCD FIFO // in fact, this is only needed when LCD pixel clock is set too high esp_rom_delay_us(1); // start LCD engine lcd_ll_start(rgb_panel->hal.dev); } IRAM_ATTR static void lcd_rgb_panel_try_update_pclk(esp_rgb_panel_t *rgb_panel) { portENTER_CRITICAL_ISR(&rgb_panel->spinlock); if (unlikely(rgb_panel->flags.need_update_pclk)) { rgb_panel->flags.need_update_pclk = false; rgb_panel->timings.pclk_hz = lcd_hal_cal_pclk_freq(&rgb_panel->hal, rgb_panel->src_clk_hz, rgb_panel->timings.pclk_hz, rgb_panel->lcd_clk_flags); } portEXIT_CRITICAL_ISR(&rgb_panel->spinlock); } IRAM_ATTR static void lcd_default_isr_handler(void *args) { esp_rgb_panel_t *rgb_panel = (esp_rgb_panel_t *)args; bool need_yield = false; uint32_t intr_status = lcd_ll_get_interrupt_status(rgb_panel->hal.dev); lcd_ll_clear_interrupt_status(rgb_panel->hal.dev, intr_status); if (intr_status & LCD_LL_EVENT_VSYNC_END) { // call user registered callback if (rgb_panel->on_vsync) { if (rgb_panel->on_vsync(&rgb_panel->base, NULL, rgb_panel->user_ctx)) { need_yield = true; } } // check whether to update the PCLK frequency, it should be safe to update the PCLK frequency in the VSYNC interrupt lcd_rgb_panel_try_update_pclk(rgb_panel); if (rgb_panel->flags.stream_mode) { // check whether to restart the transmission lcd_rgb_panel_try_restart_transmission(rgb_panel); } } if (need_yield) { portYIELD_FROM_ISR(); } }