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How to make ESP32 output 20MHZ's clock
Posted: Tue Jan 24, 2017 12:58 am
by roctwo
Hi!
How to make ESP32 output 20MHZ's clock? And can you provide code?
Re: How to make ESP32 output 20MHZ's clock
Posted: Tue Jan 24, 2017 1:17 am
by kolban
Do you mean you want a square wave output on a GPIO pin that has a frequency of 20MHz? If so, you can likely use the PWM functions.
Re: How to make ESP32 output 20MHZ's clock
Posted: Tue Jan 24, 2017 3:27 am
by roctwo
OK ,Thank you,sorry for my bad English.I will check it
Re: How to make ESP32 output 20MHZ's clock
Posted: Thu Sep 21, 2017 6:41 pm
by ppisljar
seems pwm can only be used to generate 333k clock ... what about higher frequencies ?
Re: How to make ESP32 output 20MHZ's clock
Posted: Thu Sep 21, 2017 9:53 pm
by ESP_krzychb
roctwo wrote:How to make ESP32 output 20MHZ's clock? And can you provide code?
Below is an example how to generate 20MHz square wave at 50% duty on GPIO18.
#include "driver/ledc.h"
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_HIGH_SPEED_MODE,
.timer_num = LEDC_TIMER_0,
.bit_num = 2,
.freq_hz = 20000000
};
ledc_channel_config_t ledc_channel = {
.channel = LEDC_CHANNEL_0,
.gpio_num = 18,
.speed_mode = LEDC_HIGH_SPEED_MODE,
.timer_sel = LEDC_TIMER_0,
.duty = 2
};
void app_main()
{
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
while (1) {
;
}
}
The
LED PWM Controller can generate up to 40MHz square wave.