Arduino-esp32: Reset ESP32 with GPIO 12 configured as OUTPUT or INPUT.

[BlackTiger44]

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Hardware:

Board: ESP32 DEVKIT V1 - DOIT
Core Installation/update date: ?11/jul/2017?
IDE name: ?Arduino IDE? ?Platform.io? ?IDF component?
Flash Frequency: ?40Mhz?
Upload Speed: ?115200?

Description:

On my ESP32 DEVKIT V1 board from DOIT, when configuring the GPIO12 (D12) as an output or as an input, the following error occurs every time I start the program

rst: 0x10 (RTCWDT_RTC_RESET), boot: 0x37 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
Falling back to built-in command interpreter.
okay

If the cable that reaches the GPIO12 (D12) is physically loosened, both configured as input and output, the ESP32 starts the program normally.

I have tried to configure GPIO12 as shown in the code below, but I can not get it to work, so any help would be welcome.

include "driver/gpio.h"

define GPIO_BIT_MASK (1ULL<

void setup()
{
app_main();
.....
}

void app_main() {
gpio_config_t io_conf;
io_conf.intr_type = GPIO_INTR_DISABLE;
io_conf.mode = GPIO_MODE_OUTPUT;
io_conf.pin_bit_mask = GPIO_BIT_MASK;
io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
gpio_config(&io_conf);
}

Thanks

BlakcTiger

[lbernstone]

GPIO12 is also MTDI, which changes the voltage of the internal LDO to 1.8V if pulled high at boot. This is also a problem for many boards that use gpio12 for the sd card (sd cards have internal pullups).

[BlackTiger44]

Thanks Ibernstone for the clarification.

Greetings BlackTiger

[lbernstone]

If that "solves" the issue, please close it.

[BlackTiger44]

..

[kraker31]

It's a clarification, that doesn't solve anything :(

[kraker31]

The best way to solve the pb should be to change the efuse configuration to force MTDI to 0 as it should be. No?

[lbernstone]

Yes
https://github.com/espressif/esp-idf/tree/master/examples/storage/sd_card#note-about-gpio12-esp32-only