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ledc: Fix the usage of ledc_ls_timer_update and ledc_timer_rst

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ledc_ls_timer_update is required only when CLK_DIV and DUTY_RES bits are changed.
Calling ledc_timer_rst while re-configure PWM frequency through ledc_set_freq can cause glitch in the signal
This commit is contained in:
Song Ruo Jing
2022-08-18 12:34:11 +08:00
parent 5666813ce0
commit 4cd54d6e32
2 changed files with 7 additions and 6 deletions
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12
components/driver/ledc.c
View File

@@ -228,7 +228,6 @@ esp_err_t ledc_timer_rst(ledc_mode_t speed_mode, ledc_timer_t timer_sel)
LEDC_CHECK(p_ledc_obj[speed_mode] != NULL, LEDC_NOT_INIT, ESP_ERR_INVALID_STATE);
portENTER_CRITICAL(&ledc_spinlock);
ledc_hal_timer_rst(&(p_ledc_obj[speed_mode]->ledc_hal), timer_sel);
ledc_ls_timer_update(speed_mode, timer_sel);
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
@@ -240,7 +239,6 @@ esp_err_t ledc_timer_pause(ledc_mode_t speed_mode, ledc_timer_t timer_sel)
LEDC_CHECK(p_ledc_obj[speed_mode] != NULL, LEDC_NOT_INIT, ESP_ERR_INVALID_STATE);
portENTER_CRITICAL(&ledc_spinlock);
ledc_hal_timer_pause(&(p_ledc_obj[speed_mode]->ledc_hal), timer_sel);
ledc_ls_timer_update(speed_mode, timer_sel);
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
@@ -252,7 +250,6 @@ esp_err_t ledc_timer_resume(ledc_mode_t speed_mode, ledc_timer_t timer_sel)
LEDC_CHECK(p_ledc_obj[speed_mode] != NULL, LEDC_NOT_INIT, ESP_ERR_INVALID_STATE);
portENTER_CRITICAL(&ledc_spinlock);
ledc_hal_timer_resume(&(p_ledc_obj[speed_mode]->ledc_hal), timer_sel);
ledc_ls_timer_update(speed_mode, timer_sel);
portEXIT_CRITICAL(&ledc_spinlock);
return ESP_OK;
}
@@ -312,8 +309,6 @@ static esp_err_t ledc_set_timer_div(ledc_mode_t speed_mode, ledc_timer_t timer_n
}
//Set the divisor
ledc_timer_set(speed_mode, timer_num, div_param, duty_resolution, timer_clk_src);
// reset the timer
ledc_timer_rst(speed_mode, timer_num);
return ESP_OK;
error:
ESP_LOGE(LEDC_TAG, "requested frequency and duty resolution can not be achieved, try reducing freq_hz or duty_resolution. div_param=%d",
@@ -348,7 +343,12 @@ esp_err_t ledc_timer_config(const ledc_timer_config_t* timer_conf)
ledc_hal_init(&(p_ledc_obj[speed_mode]->ledc_hal), speed_mode);
}
return ledc_set_timer_div(speed_mode, timer_num, timer_conf->clk_cfg, freq_hz, duty_resolution);
esp_err_t ret = ledc_set_timer_div(speed_mode, timer_num, timer_conf->clk_cfg, freq_hz, duty_resolution);
if (ret == ESP_OK) {
/* Reset the 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)

1
components/driver/test/test_ledc.c
View File

@@ -548,6 +548,7 @@ TEST_CASE("LEDC timer pause and resume", "[ledc][test_env=UT_T1_LEDC]")
printf("reset ledc timer\n");
TEST_ESP_OK(ledc_timer_rst(test_speed_mode, LEDC_TIMER_0));
vTaskDelay(100 / portTICK_RATE_MS);
count = wave_count(1000);
TEST_ASSERT_UINT32_WITHIN(5, count, 5000);
}