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esp-idf/components/driver/ledc.c
Wangjialin 6b5e734901 driver: ledc - update fading functions, add example and doc 
1. add fading functions.
2. clear up ledc.c and ledc.h
3. update api doc.
4. add ledc example
5. edit ledc.rst and add readme for example code.
6. add s_ prefix for static global values.
7. add mutex for fade functions
8. minor changes according to the comments.
2017-01-05 17:57:52 +08:00

568 lines
24 KiB
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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <esp_types.h>
#include "esp_intr.h"
#include "esp_intr_alloc.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/xtensa_api.h"
#include "soc/gpio_sig_map.h"
#include "driver/ledc.h"
#include "soc/ledc_reg.h"
#include "soc/ledc_struct.h"
#include "esp_log.h"
static const char* LEDC_TAG = "ledc";
static portMUX_TYPE ledc_spinlock = portMUX_INITIALIZER_UNLOCKED;
#define LEDC_CHECK(a, str, ret_val) \
if (!(a)) { \
ESP_LOGE(LEDC_TAG,"%s(%d): %s", __FUNCTION__, __LINE__, str); \
return (ret_val); \
}
typedef struct {
uint16_t speed_mode;
uint16_t direction;
int target_duty;
int cycle_num;
int scale;
ledc_fade_mode_t mode;
xSemaphoreHandle ledc_fade_sem;
xSemaphoreHandle ledc_fade_mux;
} ledc_fade_t;
static ledc_fade_t* s_ledc_fade_rec = NULL;
static ledc_isr_handle_t s_ledc_fade_isr_handle = NULL;
#define LEDC_VAL_NO_CHANGE (-1)
#define LEDC_STEP_NUM_MAX (1023)
#define LEDC_DUTY_DECIMAL_BIT_NUM (4)
#define LEDC_MODE_ERR_STR "LEDC mode error"
#define LEDC_TIMER_ERR_STR "LEDC timer error"
#define LEDC_CHANNEL_ERR_STR "LEDC channel error"
#define LEDC_GPIO_OUT_ERR_STR "LEDC GPIO output number error"
#define LEDC_FADE_DIR_ERR_STR "LEDC fade direction error"
#define LEDC_FADE_SERVICE_ERR_STR "LEDC fade service not installed"
#define LEDC_FADE_TARGET_ERR_STR "LEDC fade target duty error"
#define LEDC_FADE_INSTALLED_ERR_STR "LEDC fade service already installed"
#define LEDC_FADE_MODE_ERR_STR "LEDC fade mode error"
esp_err_t ledc_timer_set(ledc_mode_t speed_mode, ledc_timer_t timer_sel, uint32_t div_num, uint32_t bit_num, ledc_clk_src_t clk_src)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(timer_sel <= LEDC_TIMER_3, LEDC_TIMER_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
LEDC.timer_group[speed_mode].timer[timer_sel].conf.div_num = div_num;
LEDC.timer_group[speed_mode].timer[timer_sel].conf.tick_sel = clk_src;
LEDC.timer_group[speed_mode].timer[timer_sel].conf.bit_num = bit_num;
if (speed_mode != LEDC_HIGH_SPEED_MODE) {
LEDC.timer_group[speed_mode].timer[timer_sel].conf.low_speed_update = 1;
}
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
static IRAM_ATTR esp_err_t ledc_duty_config(ledc_mode_t speed_mode, ledc_channel_t channel_num, int hpoint_val, uint32_t duty_val,
uint32_t duty_direction, uint32_t duty_num, uint32_t duty_cycle, uint32_t duty_scale)
{
portENTER_CRITICAL(&ledc_spinlock);
if (hpoint_val >= 0) {
LEDC.channel_group[speed_mode].channel[channel_num].hpoint.hpoint = hpoint_val;
}
LEDC.channel_group[speed_mode].channel[channel_num].duty.duty = duty_val;
LEDC.channel_group[speed_mode].channel[channel_num].conf1.val = ((duty_direction & LEDC_DUTY_INC_HSCH0_V) << LEDC_DUTY_INC_HSCH0_S) |
((duty_num & LEDC_DUTY_NUM_HSCH0_V) << LEDC_DUTY_NUM_HSCH0_S) |
((duty_cycle & LEDC_DUTY_CYCLE_HSCH0_V) << LEDC_DUTY_CYCLE_HSCH0_S) |
((duty_scale & LEDC_DUTY_SCALE_HSCH0_V) << LEDC_DUTY_SCALE_HSCH0_S);
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
esp_err_t ledc_bind_channel_timer(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t timer_idx)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(timer_idx <= LEDC_TIMER_3, LEDC_TIMER_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
LEDC.channel_group[speed_mode].channel[channel].conf0.timer_sel = timer_idx;
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
esp_err_t ledc_timer_rst(ledc_mode_t speed_mode, uint32_t timer_sel)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(timer_sel <= LEDC_TIMER_3, LEDC_TIMER_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
LEDC.timer_group[speed_mode].timer[timer_sel].conf.rst = 1;
LEDC.timer_group[speed_mode].timer[timer_sel].conf.rst = 0;
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
esp_err_t ledc_timer_pause(ledc_mode_t speed_mode, uint32_t timer_sel)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(timer_sel <= LEDC_TIMER_3, LEDC_TIMER_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
LEDC.timer_group[speed_mode].timer[timer_sel].conf.pause = 1;
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
esp_err_t ledc_timer_resume(ledc_mode_t speed_mode, uint32_t timer_sel)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(timer_sel <= LEDC_TIMER_3, LEDC_TIMER_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
LEDC.timer_group[speed_mode].timer[timer_sel].conf.pause = 0;
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
static esp_err_t ledc_enable_intr_type(ledc_mode_t speed_mode, uint32_t channel, ledc_intr_type_t type)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
uint32_t value;
uint32_t intr_type = type;
portENTER_CRITICAL(&ledc_spinlock);
value = LEDC.int_ena.val;
if (intr_type == LEDC_INTR_FADE_END) {
LEDC.int_ena.val = value | BIT(LEDC_DUTY_CHNG_END_HSCH0_INT_ENA_S + channel);
} else {
LEDC.int_ena.val = ( value & ( ~( BIT(LEDC_DUTY_CHNG_END_HSCH0_INT_ENA_S + channel) ) ) );
}
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
esp_err_t ledc_isr_register(void (*fn)(void*), void * arg, int intr_alloc_flags, ledc_isr_handle_t *handle)
{
esp_err_t ret;
LEDC_CHECK(fn, "ledc isr null", ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
ret = esp_intr_alloc(ETS_LEDC_INTR_SOURCE, intr_alloc_flags, fn, arg, handle);
portEXIT_CRITICAL(&ledc_spinlock);
return ret;
}
esp_err_t ledc_timer_config(ledc_timer_config_t* timer_conf)
{
int freq_hz = timer_conf->freq_hz;
int bit_num = timer_conf->bit_num;
int timer_num = timer_conf->timer_num;
int speed_mode = timer_conf->speed_mode;
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
periph_module_enable(PERIPH_LEDC_MODULE);
if (freq_hz == 0 || bit_num == 0 || bit_num > LEDC_TIMER_15_BIT) {
ESP_LOGE(LEDC_TAG, "freq_hz=%u bit_num=%u", freq_hz, bit_num);
return ESP_ERR_INVALID_ARG;
}
if (timer_num > LEDC_TIMER_3) {
ESP_LOGE(LEDC_TAG, "invalid timer #%u", timer_num);
return ESP_ERR_INVALID_ARG;
}
esp_err_t ret = ESP_OK;
uint32_t precision = ( 0x1 << bit_num ); // 2**depth
// Try calculating divisor based on LEDC_APB_CLK
ledc_clk_src_t timer_clk_src = LEDC_APB_CLK;
// div_param is a Q10.8 fixed point value
uint64_t div_param = ( (uint64_t) LEDC_APB_CLK_HZ << 8 ) / freq_hz / precision;
if (div_param < 256) {
// divisor is too low
ESP_LOGE(LEDC_TAG, "requested frequency and bit depth can not be achieved, try reducing freq_hz or bit_num. div_param=%d",
(uint32_t ) div_param);
ret = ESP_FAIL;
}
if (div_param > LEDC_DIV_NUM_HSTIMER0_V) {
// APB_CLK results in divisor which too high. Try using REF_TICK as clock source.
timer_clk_src = LEDC_REF_TICK;
div_param = ( (uint64_t) LEDC_REF_CLK_HZ << 8 ) / freq_hz / precision;
if (div_param < 256 || div_param > LEDC_DIV_NUM_HSTIMER0_V) {
ESP_LOGE(LEDC_TAG, "requested frequency and bit depth can not be achieved, try increasing freq_hz or bit_num. div_param=%d",
(uint32_t ) div_param);
ret = ESP_FAIL;
}
}
// set timer parameters
ledc_timer_set(speed_mode, timer_num, div_param, bit_num, timer_clk_src);
// reset timer
ledc_timer_rst(speed_mode, timer_num);
return ret;
}
esp_err_t ledc_set_pin(int gpio_num, ledc_mode_t speed_mode, ledc_channel_t ledc_channel)
{
LEDC_CHECK(ledc_channel <= LEDC_CHANNEL_7, LEDC_CHANNEL_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(GPIO_IS_VALID_OUTPUT_GPIO(gpio_num), LEDC_GPIO_OUT_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[gpio_num], PIN_FUNC_GPIO);
gpio_set_direction(gpio_num, GPIO_MODE_OUTPUT);
if (speed_mode == LEDC_HIGH_SPEED_MODE) {
gpio_matrix_out(gpio_num, LEDC_HS_SIG_OUT0_IDX + ledc_channel, 0, 0);
} else {
ESP_LOGE(LEDC_TAG, "low speed mode is not implemented");
return ESP_ERR_NOT_SUPPORTED;
}
return ESP_OK;
}
esp_err_t ledc_channel_config(ledc_channel_config_t* ledc_conf)
{
uint32_t speed_mode = ledc_conf->speed_mode;
uint32_t gpio_num = ledc_conf->gpio_num;
uint32_t ledc_channel = ledc_conf->channel;
uint32_t timer_select = ledc_conf->timer_sel;
uint32_t intr_type = ledc_conf->intr_type;
uint32_t duty = ledc_conf->duty;
LEDC_CHECK(ledc_channel <= LEDC_CHANNEL_7, LEDC_CHANNEL_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(GPIO_IS_VALID_OUTPUT_GPIO(gpio_num), LEDC_GPIO_OUT_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(timer_select <= LEDC_TIMER_3, LEDC_TIMER_ERR_STR, ESP_ERR_INVALID_ARG);
periph_module_enable(PERIPH_LEDC_MODULE);
esp_err_t ret = ESP_OK;
/*set channel parameters*/
/* channel parameters decide how the waveform looks like in one period*/
/* set channel duty, duty range is (0 ~ ((2 ** bit_num) - 1))*/
ledc_set_duty(speed_mode, ledc_channel, duty);
/*update duty settings*/
ledc_update_duty(speed_mode, ledc_channel);
/*bind the channel with the timer*/
ledc_bind_channel_timer(speed_mode, ledc_channel, timer_select);
/*set interrupt type*/
ledc_enable_intr_type(speed_mode, ledc_channel, intr_type);
ESP_LOGD(LEDC_TAG, "LEDC_PWM CHANNEL %1u|GPIO %02u|Duty %04u|Time %01u",
ledc_channel, gpio_num, duty, timer_select
);
/*set LEDC signal in gpio matrix*/
PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[gpio_num], PIN_FUNC_GPIO);
gpio_set_direction(gpio_num, GPIO_MODE_OUTPUT);
gpio_matrix_out(gpio_num, LEDC_HS_SIG_OUT0_IDX + ledc_channel, 0, 0);
return ret;
}
esp_err_t ledc_update_duty(ledc_mode_t speed_mode, ledc_channel_t channel)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(channel <= LEDC_CHANNEL_7, LEDC_CHANNEL_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
LEDC.channel_group[speed_mode].channel[channel].conf0.sig_out_en = 1;
LEDC.channel_group[speed_mode].channel[channel].conf1.duty_start = 1;
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
esp_err_t ledc_stop(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t idle_level)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(channel <= LEDC_CHANNEL_7, LEDC_CHANNEL_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
LEDC.channel_group[speed_mode].channel[channel].conf0.idle_lv = idle_level & 0x1;
LEDC.channel_group[speed_mode].channel[channel].conf0.sig_out_en = 0;
LEDC.channel_group[speed_mode].channel[channel].conf1.duty_start = 0;
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
esp_err_t ledc_set_fade(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty, ledc_duty_direction_t fade_direction,
uint32_t step_num, uint32_t duty_cyle_num, uint32_t duty_scale)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(channel <= LEDC_CHANNEL_7, LEDC_CHANNEL_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(fade_direction <= LEDC_DUTY_DIR_INCREASE, LEDC_FADE_DIR_ERR_STR, ESP_ERR_INVALID_ARG);
if (step_num > LEDC_DUTY_NUM_HSCH0_V || duty_cyle_num > LEDC_DUTY_CYCLE_HSCH0_V || duty_scale > LEDC_DUTY_SCALE_HSCH0_V) {
ESP_LOGE(LEDC_TAG, "step_num=%u duty_cyle_num=%u duty_scale=%u", step_num, duty_cyle_num, duty_scale);
return ESP_ERR_INVALID_ARG;
}
if (s_ledc_fade_rec) {
ledc_enable_intr_type(speed_mode, channel, LEDC_INTR_DISABLE);
}
ledc_duty_config(speed_mode,
channel, //uint32_t chan_num,
0, //uint32_t hpoint_val,
duty << 4, //uint32_t duty_val,the least 4 bits are decimal part
fade_direction, //uint32_t increase,
step_num, //uint32_t duty_num,
duty_cyle_num, //uint32_t duty_cycle,
duty_scale //uint32_t duty_scale
);
return ESP_OK;
}
esp_err_t ledc_set_duty(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(channel <= LEDC_CHANNEL_7, LEDC_CHANNEL_ERR_STR, ESP_ERR_INVALID_ARG);
if (s_ledc_fade_rec) {
ledc_enable_intr_type(speed_mode, channel, LEDC_INTR_DISABLE);
}
ledc_duty_config(speed_mode,
channel, //uint32_t chan_num,
0, //uint32_t hpoint_val,
duty << 4, //uint32_t duty_val,the least 4 bits are decimal part
1, //uint32_t increase,
1, //uint32_t duty_num,
1, //uint32_t duty_cycle,
0 //uint32_t duty_scale
);
return ESP_OK;
}
int ledc_get_duty(ledc_mode_t speed_mode, ledc_channel_t channel)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, (-1));
uint32_t duty = (LEDC.channel_group[speed_mode].channel[channel].duty_rd.duty_read >> 4);
return duty;
}
esp_err_t ledc_set_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num, uint32_t freq_hz)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
portENTER_CRITICAL(&ledc_spinlock);
esp_err_t ret = ESP_OK;
uint32_t div_num = 0;
uint32_t bit_num = LEDC.timer_group[speed_mode].timer[timer_num].conf.bit_num;
uint32_t timer_source_clk = LEDC.timer_group[speed_mode].timer[timer_num].conf.tick_sel;
uint32_t precision = ( 0x1 << bit_num );
if (timer_source_clk == LEDC_APB_CLK) {
div_num = ( (uint64_t) LEDC_APB_CLK_HZ << 8 ) / freq_hz / precision;
} else {
div_num = ( (uint64_t) LEDC_REF_CLK_HZ << 8 ) / freq_hz / precision;
}
if (div_num <= 256 || div_num > LEDC_DIV_NUM_HSTIMER0) {
ESP_LOGE(LEDC_TAG, "div param err,div_param=%u", div_num);
ret = ESP_FAIL;
}
LEDC.timer_group[speed_mode].timer[timer_num].conf.div_num = div_num;
portEXIT_CRITICAL(&ledc_spinlock);
return ret;
}
uint32_t ledc_get_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num)
{
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ( 0 ));
portENTER_CRITICAL(&ledc_spinlock);
uint32_t freq = 0;
uint32_t timer_source_clk = LEDC.timer_group[speed_mode].timer[timer_num].conf.tick_sel;
uint32_t bit_num = LEDC.timer_group[speed_mode].timer[timer_num].conf.bit_num;
uint32_t div_num = LEDC.timer_group[speed_mode].timer[timer_num].conf.div_num;
uint32_t precision = ( 0x1 << bit_num );
if (timer_source_clk == LEDC_APB_CLK) {
freq = ( (uint64_t) LEDC_APB_CLK_HZ << 8 ) / precision / div_num;
} else {
freq = ( (uint64_t) LEDC_REF_CLK_HZ << 8 ) / precision / div_num;
}
portEXIT_CRITICAL(&ledc_spinlock);
return freq;
}
void IRAM_ATTR ledc_fade_isr()
{
int i;
portBASE_TYPE HPTaskAwoken = pdFALSE;
uint32_t intr_status = LEDC.int_st.val; //read LEDC interrupt status.
LEDC.int_clr.val = intr_status; //clear LEDC interrupt status.
for (i = 0; i < 8; i++) {
if (intr_status & BIT(LEDC_DUTY_CHNG_END_HSCH0_INT_ST_S + i)) {
int speed_mode = s_ledc_fade_rec[i].speed_mode;
int duty_cur = LEDC.channel_group[speed_mode].channel[i].duty_rd.duty_read >> LEDC_DUTY_DECIMAL_BIT_NUM;
if (duty_cur == s_ledc_fade_rec[i].target_duty) {
if(s_ledc_fade_rec[i].mode == LEDC_FADE_WAIT_DONE) {
xSemaphoreGiveFromISR(s_ledc_fade_rec[i].ledc_fade_sem, &HPTaskAwoken);
if(HPTaskAwoken == pdTRUE) {
portYIELD_FROM_ISR() ;
}
}
continue;
}
int duty_tar = s_ledc_fade_rec[i].target_duty;
int scale = s_ledc_fade_rec[i].scale;
if (scale == 0) {
continue;
}
int cycle = s_ledc_fade_rec[i].cycle_num;
int delta = s_ledc_fade_rec[i].direction == LEDC_DUTY_DIR_DECREASE ? duty_cur - duty_tar : duty_tar - duty_cur;
int step = delta / scale > LEDC_STEP_NUM_MAX ? LEDC_STEP_NUM_MAX : delta / scale;
if (delta > scale) {
ledc_duty_config(
speed_mode,
i,
LEDC_VAL_NO_CHANGE,
duty_cur << LEDC_DUTY_DECIMAL_BIT_NUM,
s_ledc_fade_rec[i].direction,
step,
cycle,
scale);
} else {
ledc_duty_config(
speed_mode,
i,
LEDC_VAL_NO_CHANGE,
duty_tar << LEDC_DUTY_DECIMAL_BIT_NUM,
s_ledc_fade_rec[i].direction,
1,
1,
0);
}
LEDC.channel_group[speed_mode].channel[i].conf1.duty_start = 1;
}
}
LEDC.int_clr.val = intr_status; //clear LEDC interrupt status.
}
esp_err_t ledc_set_fade_with_time(ledc_mode_t speed_mode, ledc_channel_t channel, int target_duty, int max_fade_time_ms)
{
int timer_sel = LEDC.channel_group[speed_mode].channel[channel].conf0.timer_sel;
int max_duty = ( 1 << ( LEDC.timer_group[speed_mode].timer[timer_sel].conf.bit_num ) ) - 1;
LEDC_CHECK(target_duty <= max_duty, LEDC_FADE_TARGET_ERR_STR, ESP_ERR_INVALID_ARG);
uint32_t freq = ledc_get_freq(speed_mode, timer_sel);
int duty_cur = LEDC.channel_group[speed_mode].channel[channel].duty_rd.duty_read >> LEDC_DUTY_DECIMAL_BIT_NUM;
int duty_delta = target_duty > duty_cur ? target_duty - duty_cur : duty_cur - target_duty;
if (duty_delta == 0) {
return ESP_OK;
}
int total_cycles = max_fade_time_ms * freq / 1000;
int scale, cycle_num;
if (total_cycles > duty_delta) {
scale = 1;
cycle_num = total_cycles / duty_delta;
} else {
cycle_num = 1;
scale = ( duty_delta + total_cycles - 1 ) / total_cycles;
}
return ledc_set_fade_with_step(speed_mode, channel, target_duty, scale, cycle_num);
}
esp_err_t ledc_set_fade_with_step(ledc_mode_t speed_mode, ledc_channel_t channel, int target_duty, int scale, int cycle_num)
{
LEDC_CHECK(s_ledc_fade_rec != NULL, LEDC_FADE_SERVICE_ERR_STR, ESP_ERR_INVALID_STATE);
LEDC_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, LEDC_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
LEDC_CHECK(channel < LEDC_CHANNEL_MAX, LEDC_CHANNEL_ERR_STR, ESP_ERR_INVALID_ARG);
int timer_sel = LEDC.channel_group[speed_mode].channel[channel].conf0.timer_sel;
int max_duty = (1 << (LEDC.timer_group[speed_mode].timer[timer_sel].conf.bit_num)) - 1;
LEDC_CHECK(target_duty <= max_duty, LEDC_FADE_TARGET_ERR_STR, ESP_ERR_INVALID_ARG);
//disable the interrupt, so the operation will not mess up
ledc_enable_intr_type(speed_mode, channel, LEDC_INTR_DISABLE);
portENTER_CRITICAL(&ledc_spinlock);
int duty_cur = LEDC.channel_group[speed_mode].channel[channel].duty_rd.duty_read >> LEDC_DUTY_DECIMAL_BIT_NUM;
int duty_delta = target_duty > duty_cur ? target_duty - duty_cur : duty_cur - target_duty;
if (duty_delta == 0) {
return ESP_OK;
}
s_ledc_fade_rec[channel].speed_mode = speed_mode;
s_ledc_fade_rec[channel].target_duty = target_duty;
s_ledc_fade_rec[channel].cycle_num = cycle_num;
s_ledc_fade_rec[channel].scale = scale;
int step_num;
if (duty_cur > target_duty) {
s_ledc_fade_rec[channel].direction = LEDC_DUTY_DIR_DECREASE;
step_num = ( duty_cur - target_duty ) / scale;
step_num = step_num > LEDC_STEP_NUM_MAX ? LEDC_STEP_NUM_MAX : step_num;
} else {
s_ledc_fade_rec[channel].direction = LEDC_DUTY_DIR_INCREASE;
step_num = ( target_duty - duty_cur ) / scale;
step_num = step_num > LEDC_STEP_NUM_MAX ? LEDC_STEP_NUM_MAX : step_num;
}
portEXIT_CRITICAL(&ledc_spinlock);
ledc_set_fade(
speed_mode,
channel,
duty_cur,
s_ledc_fade_rec[channel].direction,
step_num,
s_ledc_fade_rec[channel].cycle_num,
s_ledc_fade_rec[channel].scale
);
ESP_LOGD(LEDC_TAG, "cur duty: %d; target: %d, step: %d, cycle: %d; scale: %d\n",
LEDC.channel_group[speed_mode].channel[channel].duty_rd.duty_read >> LEDC_DUTY_DECIMAL_BIT_NUM,
target_duty,
step_num,
s_ledc_fade_rec[channel].cycle_num,
s_ledc_fade_rec[channel].scale
);
LEDC.int_clr.val |= BIT(LEDC_DUTY_CHNG_END_HSCH0_INT_ENA_S + channel);
ledc_enable_intr_type(speed_mode, channel, LEDC_INTR_FADE_END);
return ESP_OK;
}
esp_err_t ledc_fade_func_install(int intr_alloc_flags)
{
LEDC_CHECK(s_ledc_fade_rec == NULL, LEDC_FADE_INSTALLED_ERR_STR, ESP_ERR_INVALID_STATE);
s_ledc_fade_rec = (ledc_fade_t*) calloc(LEDC_CHANNEL_MAX, sizeof(ledc_fade_t));
if (s_ledc_fade_rec == NULL) {
return ESP_ERR_NO_MEM;
}
int i = 0;
for (i = 0; i < LEDC_CHANNEL_MAX; i++) {
s_ledc_fade_rec[i].ledc_fade_sem = xSemaphoreCreateBinary();
s_ledc_fade_rec[i].ledc_fade_mux = xSemaphoreCreateMutex();
if (s_ledc_fade_rec[i].ledc_fade_sem == NULL || s_ledc_fade_rec[i].ledc_fade_mux == NULL) {
ledc_fade_func_uninstall();
return ESP_ERR_NO_MEM;
}
}
//OR intr_alloc_flags with ESP_INTR_FLAG_IRAM because the fade isr is in IRAM
ledc_isr_register(ledc_fade_isr, NULL, intr_alloc_flags | ESP_INTR_FLAG_IRAM, &s_ledc_fade_isr_handle);
return ESP_OK;
}
void ledc_fade_func_uninstall()
{
if (s_ledc_fade_rec == NULL) {
return;
}
if(s_ledc_fade_isr_handle) {
esp_intr_free(s_ledc_fade_isr_handle);
s_ledc_fade_isr_handle = NULL;
}
int i;
for (i = 0; i < LEDC_CHANNEL_MAX; i++) {
if (s_ledc_fade_rec[i].ledc_fade_sem) {
xSemaphoreHandle sem_tmp = s_ledc_fade_rec[i].ledc_fade_sem;
s_ledc_fade_rec[i].ledc_fade_sem = NULL;
vSemaphoreDelete(sem_tmp);
}
if (s_ledc_fade_rec[i].ledc_fade_mux) {
xSemaphoreHandle mux_tmp = s_ledc_fade_rec[i].ledc_fade_mux;
s_ledc_fade_rec[i].ledc_fade_mux = NULL;
vSemaphoreDelete(mux_tmp);
}
}
free(s_ledc_fade_rec);
s_ledc_fade_rec = NULL;
return;
}
esp_err_t ledc_fade_start(ledc_channel_t channel, ledc_fade_mode_t wait_done)
{
LEDC_CHECK(s_ledc_fade_rec != NULL, LEDC_FADE_SERVICE_ERR_STR, ESP_ERR_INVALID_STATE);
LEDC_CHECK(wait_done < LEDC_FADE_MAX, LEDC_FADE_MODE_ERR_STR, ESP_ERR_INVALID_ARG);
int speed_mode = s_ledc_fade_rec[channel].speed_mode;
xSemaphoreTake(s_ledc_fade_rec[channel].ledc_fade_mux, portMAX_DELAY);
if (wait_done == LEDC_FADE_WAIT_DONE) {
s_ledc_fade_rec[channel].mode = LEDC_FADE_WAIT_DONE;
ledc_update_duty(speed_mode, channel);
xSemaphoreTake(s_ledc_fade_rec[channel].ledc_fade_sem, portMAX_DELAY);
} else {
s_ledc_fade_rec[channel].mode = LEDC_FADE_NO_WAIT;
ledc_update_duty(speed_mode, channel);
}
xSemaphoreGive(s_ledc_fade_rec[channel].ledc_fade_mux);
return ESP_OK;
}
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