ESP-IDF
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Outline
#include "hal/ledc_hal.h"
#include "esp_rom_sys.h"
ledc_hal_init(ledc_hal_context_t *, ledc_mode_t)
ledc_hal_get_clk_cfg(ledc_hal_context_t *, ledc_timer_t, ledc_clk_cfg_t *)
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/hal/ledc_hal.c
 
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/* * SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ // The HAL layer for LEDC (common part) #include "hal/ledc_hal.h" #include "esp_rom_sys.h" void ledc_hal_init(ledc_hal_context_t *hal, ledc_mode_t speed_mode) { //Get hardware instance. hal->dev = LEDC_LL_GET_HW(); hal->speed_mode = speed_mode; ledc_ll_enable_mem_power(true); }{ ... } void ledc_hal_get_clk_cfg(ledc_hal_context_t *hal, ledc_timer_t timer_sel, ledc_clk_cfg_t *clk_cfg) { /* Use the following variable to retrieve the clock source used by the LEDC * hardware controller. *//* ... */ ledc_clk_src_t clk_src; /* Clock configuration to return to the driver. */ ledc_clk_cfg_t driver_clk = LEDC_AUTO_CLK; /* Get the timer-specific mux value. */ ledc_hal_get_clock_source(hal, timer_sel, &clk_src); #if SOC_LEDC_SUPPORT_REF_TICK if (clk_src == LEDC_REF_TICK) { driver_clk = LEDC_USE_REF_TICK; }{...} else #endif { /* If the timer-specific mux is not set to REF_TICK, it either means that: * - The controller is in fast mode, and thus using APB clock (driver_clk * variable's default value) * - The controller is in slow mode and so, using a global clock, * so we have to retrieve that clock here. *//* ... */ if (hal->speed_mode == LEDC_LOW_SPEED_MODE) { /* If the source clock used by LEDC hardware is not REF_TICK, it is * necessary to retrieve the global clock source used. *//* ... */ ledc_slow_clk_sel_t slow_clk; ledc_hal_get_slow_clk_sel(hal, &slow_clk); driver_clk = (ledc_clk_cfg_t)slow_clk; }{...} #if SOC_LEDC_SUPPORT_HS_MODE else { driver_clk = LEDC_USE_APB_CLK; }{...} #endif/* ... */ }{...} *clk_cfg = driver_clk; }{ ... } #if SOC_LEDC_GAMMA_CURVE_FADE_SUPPORTED void ledc_hal_get_fade_param(ledc_hal_context_t *hal, ledc_channel_t channel_num, uint32_t range, uint32_t *dir, uint32_t *cycle, uint32_t *scale, uint32_t *step) { ledc_ll_get_fade_param_range(hal->dev, hal->speed_mode, channel_num, range, dir, cycle, scale, step); }{...} /* ... */#endif
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