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drivers: pwm: ledc: esp32: Enable RC_FAST clock source

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RC_FAST needs to be enabled and calibrated in order to be used
as clock source. Otherwise, clock source is selected but no
PWM is generated.

Signed-off-by: Raffael Rostagno <raffael.rostagno@espressif.com>
This commit is contained in:
Raffael Rostagno 2025-06-03 16:38:56 -03:00 • committed by Daniel DeGrasse
commit 00372dd6a9
1 changed files with 16 additions and 4 deletions
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20
drivers/pwm/pwm_led_esp32.c
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@ -10,6 +10,8 @@
#include <hal/ledc_hal.h>
#include <hal/ledc_types.h>
#include <esp_clk_tree.h>
#include <soc/rtc.h>
#include <clk_ctrl_os.h>
#include <soc.h>
#include <errno.h>
@ -150,10 +152,20 @@ static int pwm_led_esp32_timer_config(struct pwm_ledc_esp32_channel_config *chan
* Try each clock source available depending on the device and channel type.
*/
for (int i = 0; i < clock_src_num; i++) {
channel->clock_src = clock_src[i];
esp_clk_tree_src_get_freq_hz(channel->clock_src,
ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED,
&channel->clock_src_hz);
if (clock_src[i] == LEDC_SLOW_CLK_RC_FAST) {
/* RC_FAST requires enabling and calibrating */
if (!rtc_dig_8m_enabled() && !periph_rtc_dig_clk8m_enable()) {
/* skip RC_FAST as clock source */
continue;
}
channel->clock_src = clock_src[i];
channel->clock_src_hz = periph_rtc_dig_clk8m_get_freq();
} else {
channel->clock_src = clock_src[i];
esp_clk_tree_src_get_freq_hz(channel->clock_src,
ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED,
&channel->clock_src_hz);
}
if (!pwm_led_esp32_calculate_max_resolution(channel)) {
return 0;
}