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fix(ledc): fix ledc driver 100% duty cycle configuration
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Update ledc duty cycle value range in doxygen.
Fix duty configuration error at 100% duty cycle for ESP32.
Improve LEDC API doxygen.

Closes #11516
Closes #12593
Closes #12083
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@songruo @espressif-bot
songruo authored and espressif-bot committed Nov 22, 2023
1 parent 6c9c30f commit c0a1d27
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Showing 6 changed files with 104 additions and 48 deletions.
103 changes: 67 additions & 36 deletions components/driver/include/driver/ledc.h
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
Expand Down Expand Up @@ -38,12 +38,12 @@ extern "C" {
*/
typedef struct {
int gpio_num; /*!< the LEDC output gpio_num, if you want to use gpio16, gpio_num = 16 */
ledc_mode_t speed_mode; /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
ledc_mode_t speed_mode; /*!< LEDC speed speed_mode, high-speed mode (only exists on esp32) or low-speed mode */
ledc_channel_t channel; /*!< LEDC channel (0 - 7) */
ledc_intr_type_t intr_type; /*!< configure interrupt, Fade interrupt enable or Fade interrupt disable */
ledc_timer_t timer_sel; /*!< Select the timer source of channel (0 - 3) */
uint32_t duty; /*!< LEDC channel duty, the range of duty setting is [0, (2**duty_resolution)] */
int hpoint; /*!< LEDC channel hpoint value, the max value is 0xfffff */
int hpoint; /*!< LEDC channel hpoint value, the range is [0, (2**duty_resolution)-1] */
struct {
unsigned int output_invert: 1;/*!< Enable (1) or disable (0) gpio output invert */
} flags; /*!< LEDC flags */
Expand All @@ -54,7 +54,7 @@ typedef struct {
* @brief Configuration parameters of LEDC Timer timer for ledc_timer_config function
*/
typedef struct {
ledc_mode_t speed_mode; /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
ledc_mode_t speed_mode; /*!< LEDC speed speed_mode, high-speed mode (only exists on esp32) or low-speed mode */
ledc_timer_bit_t duty_resolution; /*!< LEDC channel duty resolution */
ledc_timer_t timer_num; /*!< The timer source of channel (0 - 3) */
uint32_t freq_hz; /*!< LEDC timer frequency (Hz) */
Expand Down Expand Up @@ -83,7 +83,7 @@ typedef struct {
ledc_cb_event_t event; /**< Event name */
uint32_t speed_mode; /**< Speed mode of the LEDC channel group */
uint32_t channel; /**< LEDC channel (0 - LEDC_CHANNEL_MAX-1) */
uint32_t duty; /**< LEDC current duty of the channel, the range of duty is [0, (2**duty_resolution) - 1] */
uint32_t duty; /**< LEDC current duty of the channel, the range of duty is [0, (2**duty_resolution)] */
} ledc_cb_param_t;

/**
Expand Down Expand Up @@ -129,6 +129,7 @@ esp_err_t ledc_timer_config(const ledc_timer_config_t *timer_conf);

/**
* @brief LEDC update channel parameters
*
* @note Call this function to activate the LEDC updated parameters.
* After ledc_set_duty, we need to call this function to update the settings.
* And the new LEDC parameters don't take effect until the next PWM cycle.
Expand All @@ -141,7 +142,6 @@ esp_err_t ledc_timer_config(const ledc_timer_config_t *timer_conf);
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*
*/
esp_err_t ledc_update_duty(ledc_mode_t speed_mode, ledc_channel_t channel);

Expand Down Expand Up @@ -204,15 +204,17 @@ uint32_t ledc_get_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num);
/**
* @brief LEDC set duty and hpoint value
* Only after calling ledc_update_duty will the duty update.
*
* @note ledc_set_duty, ledc_set_duty_with_hpoint and ledc_update_duty are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_duty_and_update
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution) - 1]
* @param hpoint Set the LEDC hpoint value(max: 0xfffff)
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution)]
* @param hpoint Set the LEDC hpoint value, the range is [0, (2**duty_resolution)-1]
*
* @return
* - ESP_OK Success
Expand All @@ -225,6 +227,7 @@ esp_err_t ledc_set_duty_with_hpoint(ledc_mode_t speed_mode, ledc_channel_t chann
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
*
* @return
* - LEDC_ERR_VAL if parameter error
* - Others Current hpoint value of LEDC channel
Expand All @@ -235,14 +238,16 @@ int ledc_get_hpoint(ledc_mode_t speed_mode, ledc_channel_t channel);
* @brief LEDC set duty
* This function do not change the hpoint value of this channel. if needed, please call ledc_set_duty_with_hpoint.
* only after calling ledc_update_duty will the duty update.
*
* @note ledc_set_duty, ledc_set_duty_with_hpoint and ledc_update_duty are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_duty_and_update.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution) - 1]
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution)]
*
* @return
* - ESP_OK Success
Expand All @@ -268,11 +273,13 @@ uint32_t ledc_get_duty(ledc_mode_t speed_mode, ledc_channel_t channel);
/**
* @brief LEDC set gradient
* Set LEDC gradient, After the function calls the ledc_update_duty function, the function can take effect.
*
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the start of the gradient duty, the range of duty setting is [0, (2**duty_resolution) - 1]
* @param duty Set the start of the gradient duty, the range of duty setting is [0, (2**duty_resolution)]
* @param fade_direction Set the direction of the gradient
* @param step_num Set the number of the gradient
* @param duty_cycle_num Set how many LEDC tick each time the gradient lasts
Expand All @@ -298,7 +305,8 @@ esp_err_t ledc_set_fade(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Function pointer error.
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Failed to find available interrupt source
*/
esp_err_t ledc_isr_register(void (*fn)(void *), void *arg, int intr_alloc_flags, ledc_isr_handle_t *handle);

Expand All @@ -308,7 +316,7 @@ esp_err_t ledc_isr_register(void (*fn)(void *), void *arg, int intr_alloc_flags,
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param timer_sel Timer index (0-3), there are 4 timers in LEDC module
* @param clock_divider Timer clock divide value, the timer clock is divided from the selected clock source
* @param duty_resolution Resolution of duty setting in number of bits. The range of duty values is [0, (2**duty_resolution)]
* @param duty_resolution Resolution of duty setting in number of bits. The range is [1, SOC_LEDC_TIMER_BIT_WIDTH]
* @param clk_src Select LEDC source clock.
*
* @return
Expand Down Expand Up @@ -338,7 +346,6 @@ esp_err_t ledc_timer_rst(ledc_mode_t speed_mode, ledc_timer_t timer_sel);
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
*
*/
esp_err_t ledc_timer_pause(ledc_mode_t speed_mode, ledc_timer_t timer_sel);

Expand Down Expand Up @@ -369,81 +376,89 @@ esp_err_t ledc_bind_channel_timer(ledc_mode_t speed_mode, ledc_channel_t channel

/**
* @brief Set LEDC fade function.
*
* @note Call ledc_fade_func_install() once before calling this function.
* Call ledc_fade_start() after this to start fading.
* @note ledc_set_fade_with_step, ledc_set_fade_with_time and ledc_fade_start are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_fade_step_and_start
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode. ,
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param target_duty Target duty of fading [0, (2**duty_resolution)]
* @param scale Controls the increase or decrease step scale.
* @param cycle_num increase or decrease the duty every cycle_num cycles
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_INVALID_STATE Channel not initialized
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_with_step(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, uint32_t scale, uint32_t cycle_num);

/**
* @brief Set LEDC fade function, with a limited time.
*
* @note Call ledc_fade_func_install() once before calling this function.
* Call ledc_fade_start() after this to start fading.
* @note ledc_set_fade_with_step, ledc_set_fade_with_time and ledc_fade_start are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_fade_step_and_start
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode. ,
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param target_duty Target duty of fading [0, (2**duty_resolution)]
* @param max_fade_time_ms The maximum time of the fading ( ms ).
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_INVALID_STATE Channel not initialized
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_with_time(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, int max_fade_time_ms);

/**
* @brief Install LEDC fade function. This function will occupy interrupt of LEDC module.
*
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function already installed.
* - ESP_ERR_INVALID_ARG Intr flag error
* - ESP_ERR_NOT_FOUND Failed to find available interrupt source
* - ESP_ERR_INVALID_STATE Fade function already installed
*/
esp_err_t ledc_fade_func_install(int intr_alloc_flags);

/**
* @brief Uninstall LEDC fade function.
*
*/
void ledc_fade_func_uninstall(void);

/**
* @brief Start LEDC fading.
*
* @note Call ledc_fade_func_install() once before calling this function.
* Call this API right after ledc_set_fade_with_time or ledc_set_fade_with_step before to start fading.
* @note Starting fade operation with this API is not thread-safe, use with care.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel number
* @param fade_mode Whether to block until fading done. See ledc_types.h ledc_fade_mode_t for more info.
* Note that this function will not return until fading to the target duty if LEDC_FADE_WAIT_DONE mode is selected.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_STATE Channel not initialized or fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error.
*/
esp_err_t ledc_fade_start(ledc_mode_t speed_mode, ledc_channel_t channel, ledc_fade_mode_t fade_mode);
Expand All @@ -459,73 +474,89 @@ esp_err_t ledc_fade_start(ledc_mode_t speed_mode, ledc_channel_t channel, ledc_f
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error.
* - ESP_ERR_INVALID_STATE Channel not initialized
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_fade_stop(ledc_mode_t speed_mode, ledc_channel_t channel);
#endif //SOC_LEDC_SUPPORT_FADE_STOP

/**
* @brief A thread-safe API to set duty for LEDC channel and return when duty updated.
*
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution) - 1]
* @param hpoint Set the LEDC hpoint value(max: 0xfffff)
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution)]
* @param hpoint Set the LEDC hpoint value, the range is [0, (2**duty_resolution)-1]
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Channel not initialized
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_duty_and_update(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty, uint32_t hpoint);

/**
* @brief A thread-safe API to set and start LEDC fade function, with a limited time.
*
* @note Call ledc_fade_func_install() once, before calling this function.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param target_duty Target duty of fading [0, (2**duty_resolution)]
* @param max_fade_time_ms The maximum time of the fading ( ms ).
* @param fade_mode choose blocking or non-blocking mode
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_INVALID_STATE Channel not initialized
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_time_and_start(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, uint32_t max_fade_time_ms, ledc_fade_mode_t fade_mode);

/**
* @brief A thread-safe API to set and start LEDC fade function.
*
* @note Call ledc_fade_func_install() once before calling this function.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param target_duty Target duty of fading [0, (2**duty_resolution)]
* @param scale Controls the increase or decrease step scale.
* @param cycle_num increase or decrease the duty every cycle_num cycles
* @param fade_mode choose blocking or non-blocking mode
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_INVALID_STATE Channel not initialized
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_step_and_start(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, uint32_t scale, uint32_t cycle_num, ledc_fade_mode_t fade_mode);

/**
* @brief LEDC callback registration function
*
* @note The callback is called from an ISR, it must never attempt to block, and any FreeRTOS API called must be ISR capable.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param cbs Group of LEDC callback functions
* @param user_arg user registered data for the callback function
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_INVALID_STATE Channel not initialized
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_cb_register(ledc_mode_t speed_mode, ledc_channel_t channel, ledc_cbs_t *cbs, void *user_arg);
Expand Down

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