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https://github.com/espressif/esp-idf.git
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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.
This commit is contained in:
Wangjialin
@@ -16,9 +16,6 @@
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#define _DRIVER_LEDC_H_
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#include "esp_err.h"
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#include "soc/soc.h"
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#include "soc/ledc_reg.h"
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#include "soc/ledc_reg.h"
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#include "soc/ledc_struct.h"
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#include "driver/gpio.h"
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#include "driver/periph_ctrl.h"
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#include "esp_intr_alloc.h"
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@@ -68,6 +65,7 @@ typedef enum {
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LEDC_CHANNEL_5, /*!< LEDC channel 5 */
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LEDC_CHANNEL_6, /*!< LEDC channel 6 */
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LEDC_CHANNEL_7, /*!< LEDC channel 7 */
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LEDC_CHANNEL_MAX,
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} ledc_channel_t;
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typedef enum {
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@@ -79,6 +77,11 @@ typedef enum {
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LEDC_TIMER_15_BIT = 15, /*!< LEDC PWM depth 15Bit */
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} ledc_timer_bit_t;
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typedef enum {
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LEDC_FADE_NO_WAIT = 0, /*!< LEDC fade function will return immediately */
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LEDC_FADE_WAIT_DONE, /*!< LEDC fade function will block until fading to the target duty*/
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LEDC_FADE_MAX,
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} ledc_fade_mode_t;
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/**
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* @brief Configuration parameters of LEDC channel for ledc_channel_config function
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*/
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@@ -104,43 +107,39 @@ typedef struct {
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typedef intr_handle_t ledc_isr_handle_t;
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/**
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* @brief LEDC channel configuration
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* @brief LEDC channel configuration
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* Configure LEDC channel with the given channel/output gpio_num/interrupt/source timer/frequency(Hz)/LEDC depth
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*
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* User this Function, configure LEDC channel with the given channel/output gpio_num/interrupt/source timer/frequency(Hz)/LEDC depth
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* @param ledc_conf Pointer of LEDC channel configure struct
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*
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* @param ledc_conf Pointer of LEDC channel configure struct
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Parameter error
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*
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*/
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esp_err_t ledc_channel_config(ledc_channel_config_t* ledc_conf);
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/**
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* @brief LEDC timer configuration
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*
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* User this Function, configure LEDC timer with the given source timer/frequency(Hz)/bit_num
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* @brief LEDC timer configuration
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* Configure LEDC timer with the given source timer/frequency(Hz)/bit_num
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*
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* @param timer_conf Pointer of LEDC timer configure struct
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*
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_FAIL Can not find a proper pre-divider number base on the given frequency and the current bit_num.
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*
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*/
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esp_err_t ledc_timer_config(ledc_timer_config_t* timer_conf);
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/**
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* @brief LEDC update channel parameters
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* @brief LEDC update channel parameters
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* Call this function to activate the LEDC updated parameters.
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* After ledc_set_duty, ledc_set_fade, we need to call this function to update the settings.
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*
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* Call this function to activate the LEDC updated parameters.
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* After ledc_set_duty, ledc_set_fade, we need to call this function to update the settings.
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param channel LEDC channel(0-7), select from ledc_channel_t
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode,
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* now we only support high-speed mode.
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* We will access low-speed mode in next version
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* @param channel LEDC channel(0-7), select from ledc_channel_t
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*
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* @return
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* - ESP_OK Success
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@@ -150,14 +149,11 @@ esp_err_t ledc_timer_config(ledc_timer_config_t* timer_conf);
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esp_err_t ledc_update_duty(ledc_mode_t speed_mode, ledc_channel_t channel);
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/**
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* @brief LEDC stop
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*
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* Disable LEDC output, and set idle level
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* @brief LEDC stop.
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* Disable LEDC output, and set idle level
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param channel LEDC channel(0-7), select from ledc_channel_t
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*
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* @param idle_level Set output idle level after LEDC stops.
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*
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* @return
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@@ -167,14 +163,10 @@ esp_err_t ledc_update_duty(ledc_mode_t speed_mode, ledc_channel_t channel);
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esp_err_t ledc_stop(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t idle_level);
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/**
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* @brief LEDC set channel frequency(Hz)
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*
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* Set LEDC frequency(Hz)
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* @brief LEDC set channel frequency(Hz)
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param timer_num LEDC timer index(0-3), select from ledc_timer_t
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*
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* @param freq_hz Set the LEDC frequency
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*
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* @return
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@@ -188,25 +180,20 @@ esp_err_t ledc_set_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num, uint32_t
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* @brief LEDC get channel frequency(Hz)
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param timer_num LEDC timer index(0-3), select from ledc_timer_t
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*
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* @return
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* - 0 error
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* - Others Current LEDC frequency
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*
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*/
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uint32_t ledc_get_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num);
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/**
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* @brief LEDC set duty
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*
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* Set LEDC duty, After the function calls the ledc_update_duty function, the function can take effect.
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* @brief LEDC set duty
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* Only after calling ledc_update_duty will the duty update.
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param channel LEDC channel(0-7), select from ledc_channel_t
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*
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* @param duty Set the LEDC duty, the duty range is [0, (2**bit_num) - 1]
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*
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* @return
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@@ -216,37 +203,27 @@ uint32_t ledc_get_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num);
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esp_err_t ledc_set_duty(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty);
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/**
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* @brief LEDC get duty
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* @brief LEDC get duty
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param channel LEDC channel(0-7), select from ledc_channel_t
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*
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*
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* @return
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* - (-1) parameter error
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* - Others Current LEDC duty
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*
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*/
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int ledc_get_duty(ledc_mode_t speed_mode, ledc_channel_t channel);
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/**
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* @brief LEDC set gradient
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*
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* Set LEDC gradient, After the function calls the ledc_update_duty function, the function can take effect.
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* @brief LEDC set gradient
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* Set LEDC gradient, After the function calls the ledc_update_duty function, the function can take effect.
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param channel LEDC channel(0-7), select from ledc_channel_t
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*
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* @param duty Set the start of the gradient duty, the duty range is [0, (2**bit_num) - 1]
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*
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* @param gradule_direction Set the direction of the gradient
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*
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* @param step_num Set the number of the gradient
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*
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* @param duty_cyle_num Set how many LEDC tick each time the gradient lasts
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*
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* @param duty_scale Set gradient change amplitude
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*
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* @return
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@@ -257,16 +234,16 @@ esp_err_t ledc_set_fade(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t
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uint32_t step_num, uint32_t duty_cyle_num, uint32_t duty_scale);
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/**
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* @brief register LEDC interrupt handler, the handler is an ISR.
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* The handler will be attached to the same CPU core that this function is running on.
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* @brief Register LEDC interrupt handler, the handler is an ISR.
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* The handler will be attached to the same CPU core that this function is running on.
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*
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* @param fn Interrupt handler function.
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* @param arg User-supplied argument passed to the handler function.
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* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
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* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
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* @param arg Parameter for handler function
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* @param handle Pointer to return handle. If non-NULL, a handle for the interrupt will
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* be returned here.
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* @param fn Interrupt handler function.
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* @param arg User-supplied argument passed to the handler function.
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* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
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* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
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* @param arg Parameter for handler function
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* @param handle Pointer to return handle. If non-NULL, a handle for the interrupt will
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* be returned here.
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*
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* @return
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* - ESP_OK Success
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@@ -275,48 +252,38 @@ esp_err_t ledc_set_fade(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t
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esp_err_t ledc_isr_register(void (*fn)(void*), void * arg, int intr_alloc_flags, ledc_isr_handle_t *handle);
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/**
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* @brief configure LEDC settings
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* @brief Configure LEDC settings
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param timer_sel Timer index(0-3), there are 4 timers in LEDC module
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*
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* @param div_num Timer clock divide number, the timer clock is divided from the selected clock source
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*
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* @param bit_num The count number of one period, counter range is 0 ~ ((2 ** bit_num) - 1)
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*
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* @param clk_src Select LEDC source clock.
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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* @param timer_sel Timer index(0-3), there are 4 timers in LEDC module
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* @param div_num Timer clock divide number, the timer clock is divided from the selected clock source
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* @param bit_num The count number of one period, counter range is 0 ~ ((2 ** bit_num) - 1)
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* @param clk_src Select LEDC source clock.
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*
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* @return
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* - (-1) Parameter error
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* - Other Current LEDC duty
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*
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*/
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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);
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/**
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* @brief reset LEDC timer
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* @brief Reset LEDC timer
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param timer_sel LEDC timer index(0-3), select from ledc_timer_t
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*
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*
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*/
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esp_err_t ledc_timer_rst(ledc_mode_t speed_mode, uint32_t timer_sel);
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/**
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* @brief pause LEDC timer counter
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* @brief Pause LEDC timer counter
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param timer_sel LEDC timer index(0-3), select from ledc_timer_t
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*
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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@@ -325,104 +292,96 @@ esp_err_t ledc_timer_rst(ledc_mode_t speed_mode, uint32_t timer_sel);
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esp_err_t ledc_timer_pause(ledc_mode_t speed_mode, uint32_t timer_sel);
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/**
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* @brief pause LEDC timer resume
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param timer_sel LEDC timer index(0-3), select from ledc_timer_t
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* @brief Resume LEDC timer
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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* @param timer_sel LEDC timer index(0-3), select from ledc_timer_t
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*
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*/
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esp_err_t ledc_timer_resume(ledc_mode_t speed_mode, uint32_t timer_sel);
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/**
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* @brief bind LEDC channel with the selected timer
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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*
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* @param channel LEDC channel index(0-7), select from ledc_channel_t
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*
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* @param timer_idx LEDC timer index(0-3), select from ledc_timer_t
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* @brief Bind LEDC channel with the selected timer
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode, now we only support high-speed mode. We will access low-speed mode in next version
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* @param channel LEDC channel index(0-7), select from ledc_channel_t
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* @param timer_idx LEDC timer index(0-3), select from ledc_timer_t
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t ledc_bind_channel_timer(ledc_mode_t speed_mode, uint32_t channel, uint32_t timer_idx);
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/**
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* @brief Set LEDC fade function. Should call ledc_fade_func_install() before calling this function.
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* Call ledc_fade_start() after this to start fading.
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode,
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* For now we only support high-speed mode. We will access low-speed mode soon.
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* @param channel LEDC channel index(0-7), select from ledc_channel_t
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* @param target_duty Target duty of fading.( 0 - (2 ** bit_num - 1)))
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* @param scale Controls the increase or decrease step scale.
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* @param cycle_num increase or decrease the duty every cycle_num cycles
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE Fade function not installed.
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*/
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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);
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/**
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* @brief Set LEDC fade function, with a limited time. Should call ledc_fade_func_install() before calling this function.
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* Call ledc_fade_start() after this to start fading.
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*
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* @param speed_mode Select the LEDC speed_mode, high-speed mode and low-speed mode,
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* For now we only support high-speed mode. We will access low-speed mode soon.
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* @param channel LEDC channel index(0-7), select from ledc_channel_t
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* @param target_duty Target duty of fading.( 0 - (2 ** bit_num - 1)))
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* @param max_fade_time_ms The maximum time of the fading ( ms ).
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE Fade function not installed.
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*/
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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);
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/**
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* @brief Install ledc fade function. This function will occupy interrupt of LEDC module.
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*
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* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
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* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
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*
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* @return
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* - ESP_ERR_NO_MEM No enough memory
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE Fade function already installed.
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*/
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esp_err_t ledc_fade_func_install(int intr_alloc_flags);
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/**
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* @brief Uninstall LEDC fade function.
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*
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*/
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esp_err_t ledc_bind_channel_timer(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t timer_idx);
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void ledc_fade_func_uninstall();
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/***************************EXAMPLE**********************************
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/**
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* @brief Start LEDC fading.
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*
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* @param channel LEDC channel number
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* @param wait_done Whether to block until fading done.
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*
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* ----------------EXAMPLE OF LEDC SETTING ---------------------
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* @code{c}
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* //1. enable LEDC
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* //enable LEDC module, or you can not set any register of it.
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* periph_module_enable(PERIPH_LEDC_MODULE);
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* @endcode
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*
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* @code{c}
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* //2. set LEDC timer
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* ledc_timer_config_t timer_conf = {
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* .bit_num = LEDC_TIMER_12_BIT, //set timer counter bit number
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* .freq_hz = 1000, //set frequency of pwm, here, 1000Hz
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* .speed_mode = LEDC_HIGH_SPEED_MODE, //timer mode,
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* .timer_num = LEDC_TIMER_0, //timer number
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* };
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* ledc_timer_config(&timer_conf); //setup timer.
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* @endcode
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*
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* @code{c}
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* //3. set LEDC channel
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* ledc_channel_config_t ledc_conf = {
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||||
* .channel = LEDC_CHANNEL_0; //set LEDC channel 0
|
||||
* .duty = 1000; //set the duty for initialization.(duty range is 0 ~ ((2**bit_num)-1)
|
||||
* .gpio_num = 16; //GPIO number
|
||||
* .intr_type = LEDC_INTR_FADE_END; //GPIO INTR TYPE, as an example, we enable fade_end interrupt here.
|
||||
* .speed_mode = LEDC_HIGH_SPEED_MODE; //set LEDC mode, from ledc_mode_t
|
||||
* .timer_sel = LEDC_TIMER_0; //set LEDC timer source, if different channel use one timer, the frequency and bit_num of these channels should be the same
|
||||
* }
|
||||
* ledc_channel_config(&ledc_conf); //setup the configuration
|
||||
*
|
||||
* ----------------EXAMPLE OF SETTING DUTY --- -----------------
|
||||
* @code{c}
|
||||
* ledc_channel_t ledc_channel = LEDC_CHANNEL_0; //LEDC channel(0-73)
|
||||
* uint32_t duty = 2000; //duty range is 0 ~ ((2**bit_num)-1)
|
||||
* LEDC_set_duty(LEDC_HIGH_SPEED_MODE, ledc_channel, duty); //set speed mode, channel, and duty.
|
||||
* ledc_update_duty(LEDC_HIGH_SPEED_MODE, ledc_channel); //after set duty, we need to call ledc_update_duty to update the settings.
|
||||
* @endcode
|
||||
*
|
||||
* ----------------EXAMPLE OF LEDC INTERRUPT ------------------
|
||||
* @code{c}
|
||||
* //we have fade_end interrupt and counter overflow interrupt. we just give an example of fade_end interrupt here.
|
||||
* ledc_isr_register(ledc_isr_handler, NULL, 0); //hook the isr handler for LEDC interrupt
|
||||
* @endcode
|
||||
*
|
||||
* ----------------EXAMPLE OF INTERRUPT HANDLER ---------------
|
||||
* @code{c}
|
||||
* #include "esp_attr.h"
|
||||
* void IRAM_ATTR ledc_isr_handler(void* arg) //we should add 'IRAM_ATTR' attribution when we declare the isr function
|
||||
* {
|
||||
* uint32_t intr_st = LEDC.int_st.val; //read LEDC interrupt status.
|
||||
*
|
||||
* //you will find which channels have triggered fade_end interrupt here,
|
||||
* //then, you can post some event to RTOS queue to process the event.
|
||||
* //later we will add a queue in the driver code.
|
||||
*
|
||||
* LEDC.int_clr.val = intr_st; //clear LEDC interrupt status.
|
||||
* }
|
||||
* @endcode
|
||||
*
|
||||
*--------------------------END OF EXAMPLE --------------------------
|
||||
* @return
|
||||
* - ESP_OK Success
|
||||
* - ESP_ERR_INVALID_STATE Fade function not installed.
|
||||
* - ESP_ERR_INVALID_ARG Parameter error.
|
||||
*/
|
||||
|
||||
|
||||
|
||||
esp_err_t ledc_fade_start(ledc_channel_t channel, ledc_fade_mode_t wait_done);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user