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Fix ledc panic’ed when wrong setup of frequency and bit width (#6371)

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* Fixed LEDC panic when wrong bit widht / frequency set.

* Fixed ledc example to be working on all SOCs
This commit is contained in:
P-R-O-C-H-Y
2022-03-10 14:30:57 +01:00
committed by GitHub
parent 02a3a71e7c
commit 66596fa581
2 changed files with 29 additions and 15 deletions
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10
libraries/ESP32/examples/AnalogOut/LEDCSoftwareFade/LEDCSoftwareFade.ino
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@ -13,8 +13,8 @@
// use first channel of 16 channels (started from zero)
#define LEDC_CHANNEL_0 0
// use 13 bit precission for LEDC timer
#define LEDC_TIMER_13_BIT 13
// use 12 bit precission for LEDC timer
#define LEDC_TIMER_12_BIT 12
// use 5000 Hz as a LEDC base frequency
#define LEDC_BASE_FREQ 5000
@ -28,8 +28,8 @@ int fadeAmount = 5; // how many points to fade the LED by
// Arduino like analogWrite
// value has to be between 0 and valueMax
void ledcAnalogWrite(uint8_t channel, uint32_t value, uint32_t valueMax = 255) {
// calculate duty, 8191 from 2 ^ 13 - 1
uint32_t duty = (8191 / valueMax) * min(value, valueMax);
// calculate duty, 4095 from 2 ^ 12 - 1
uint32_t duty = (4095 / valueMax) * min(value, valueMax);
// write duty to LEDC
ledcWrite(channel, duty);
@ -37,7 +37,7 @@ void ledcAnalogWrite(uint8_t channel, uint32_t value, uint32_t valueMax = 255) {
void setup() {
// Setup timer and attach timer to a led pin
ledcSetup(LEDC_CHANNEL_0, LEDC_BASE_FREQ, LEDC_TIMER_13_BIT);
ledcSetup(LEDC_CHANNEL_0, LEDC_BASE_FREQ, LEDC_TIMER_12_BIT);
ledcAttachPin(LED_PIN, LEDC_CHANNEL_0);
}