mirror of
https://github.com/espressif/esp-idf.git
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91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "unity.h"
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#include "soc/soc_caps.h"
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#include "esp_private/esp_clk.h"
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#include "esp_private/spi_flash_os.h"
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#include "driver/mcpwm_cap.h"
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#include "driver/mcpwm_sync.h"
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#include "driver/gpio.h"
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#include "test_mcpwm_utils.h"
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static bool IRAM_ATTR test_capture_callback_iram_safe(mcpwm_cap_channel_handle_t cap_channel, const mcpwm_capture_event_data_t *edata, void *user_data)
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{
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uint32_t *cap_value = (uint32_t *)user_data;
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if (edata->cap_edge == MCPWM_CAP_EDGE_NEG) {
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cap_value[1] = edata->cap_value;
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} else {
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cap_value[0] = edata->cap_value;
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}
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return false;
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}
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static void IRAM_ATTR test_mcpwm_capture_gpio_simulate(int gpio_sig)
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{
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// disable flash cache
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spi_flash_guard_get()->start();
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gpio_set_level(gpio_sig, 1);
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esp_rom_delay_us(1000);
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gpio_set_level(gpio_sig, 0);
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// enable flash cache
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spi_flash_guard_get()->end();
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}
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TEST_CASE("mcpwm_capture_iram_safe", "[mcpwm]")
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{
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printf("install mcpwm capture timer\r\n");
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mcpwm_cap_timer_handle_t cap_timer = NULL;
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mcpwm_capture_timer_config_t cap_timer_config = {
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.clk_src = MCPWM_CAPTURE_CLK_SRC_APB,
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.group_id = 0,
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};
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TEST_ESP_OK(mcpwm_new_capture_timer(&cap_timer_config, &cap_timer));
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const int cap_gpio = 0;
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// put the GPIO into a preset state
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gpio_set_level(cap_gpio, 0);
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printf("install mcpwm capture channel\r\n");
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mcpwm_cap_channel_handle_t pps_channel;
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mcpwm_capture_channel_config_t cap_chan_config = {
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.gpio_num = cap_gpio,
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.prescale = 1,
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.flags.pos_edge = true,
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.flags.neg_edge = true,
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.flags.io_loop_back = true, // so we can use GPIO functions to simulate the external capture signal
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.flags.pull_up = true,
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};
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TEST_ESP_OK(mcpwm_new_capture_channel(cap_timer, &cap_chan_config, &pps_channel));
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printf("install callback for capture channel\r\n");
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mcpwm_capture_event_callbacks_t cbs = {
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.on_cap = test_capture_callback_iram_safe,
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};
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uint32_t cap_value[2] = {0};
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TEST_ESP_OK(mcpwm_capture_channel_register_event_callbacks(pps_channel, &cbs, cap_value));
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printf("enable and start capture timer\r\n");
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TEST_ESP_OK(mcpwm_capture_timer_enable(cap_timer));
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TEST_ESP_OK(mcpwm_capture_timer_start(cap_timer));
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printf("disable cache, simulate GPIO capture signal\r\n");
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test_mcpwm_capture_gpio_simulate(cap_gpio);
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printf("capture value: Pos=%u, Neg=%u\r\n", cap_value[0], cap_value[1]);
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// Capture timer is clocked from APB by default
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uint32_t clk_src_res = esp_clk_apb_freq();
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TEST_ASSERT_UINT_WITHIN(2000, clk_src_res / 1000, cap_value[1] - cap_value[0]);
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printf("uninstall capture channel and timer\r\n");
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TEST_ESP_OK(mcpwm_del_capture_channel(pps_channel));
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TEST_ESP_OK(mcpwm_capture_timer_disable(cap_timer));
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TEST_ESP_OK(mcpwm_del_capture_timer(cap_timer));
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}
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