Closed
Description
Board
ESP32 Dev Board
Device Description
Terminal adapter
Hardware Configuration
GPIO 5,2,14 were tested out
Version
latest master (checkout manually)
IDE Name
Arduion IDE
Operating System
Linux Mint
Flash frequency
40 MHz
PSRAM enabled
yes
Upload speed
115200
Description
I am not sure if this is a software or hardware issue.
I was testing out different combinations of frequency and ledc resolution and duty cycle. I wanted to set resolution to LEDC_TIMER_1_BIT and duty to 1 (50%) and then to vary frequency from really low (few Hz to MHz).
What I noticed was that combination LEDC_TIMER_1_BIT and duty of 1 does not work for low frequencies below 489 Hz. I don't understand why. Is that a software or hardware issue? In technical documentation there is no information about this. An answer to this issue would be sufficient.
Sketch
#include "driver/ledc.h"
#if defined (ESP32)
#define LEDC_TIMER LEDC_TIMER_0
#define LEDC_MODE LEDC_HIGH_SPEED_MODE
#define LEDC_CHANNEL LEDC_CHANNEL_0
#define LEDC_DUTY_RES LEDC_TIMER_1_BIT // Set duty resolution to 13 bits
#define LEDC_DUTY 1 // Set duty to 50%. (2 ** 8) * 50% = 4096
#define LEDC_FREQUENCY 1 // Frequency in Hertz. Set frequency at 4 kHz
#endif
#define LED_GPIO 5
void setup() {
#if defined (ESP32)
ledc_timer_config_t ledc_timer = {
.speed_mode = LEDC_MODE,
.duty_resolution = LEDC_DUTY_RES,
.timer_num = LEDC_TIMER,
.freq_hz = LEDC_FREQUENCY, // Set output frequency at 5 kHz
.clk_cfg = LEDC_AUTO_CLK
};
ledc_channel_config_t ledc_channel = {
.gpio_num = LED_GPIO,
.speed_mode = LEDC_MODE,
.channel = LEDC_CHANNEL,
.intr_type = LEDC_INTR_DISABLE,
.timer_sel = LEDC_TIMER,
.duty = LEDC_DUTY, // Set duty to 0%
.hpoint = 0 //phase shift
};
ledc_timer_config(&ledc_timer);
ledc_channel_config(&ledc_channel);
#endif
}
void loop() {
}Debug Message
No message.
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- I confirm I have checked existing issues, online documentation and Troubleshooting guide.