Is there a way to trigger download boot mode by software?

[fanhuanji]

The only way to switch to download mode I've found was to pull some pin physically during power up.
Is there a method to trigger download mode by app?

[ESP_Sprite]

On which chip? The ESP32 doesn't have this, later chips (S2/S3, C series) sometimes do.

[fanhuanji]

On which chip? The ESP32 doesn't have this, later chips (S2/S3, C series) sometimes do.

On ESP32 S3 and C3.
Thanks for reply. Could you give some example please?
Some code snippet will help a lot.

[ESP_Sprite]

You can try:

Code: Select all

REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
esp_restart();

(Note you probably need to include some headers to make that work, I'll leave that to you.)

[fanhuanji]

You can try:

Code: Select all

REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
esp_restart();

(Note you probably need to include some headers to make that work, I'll leave that to you.)

Thanks. It works linke a charm.

Code: Select all

#include "esp_system.h"
#include "soc/rtc_cntl_reg.h"
/**
 * @brief Software triggering download mode for ESP32 S3
 * 
 */
void GoToDownloadMode(void)
{
    REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
    esp_restart();
}