Esp32C3 Serial1 can not use

[lybgo]

Hardware:

Board: ?ESP32C3 Dev Module?
Core Installation version: git master newest code
IDE name: ?Arduino IDE?
Flash Frequency: ?160Mhz?
Upload Speed: ?921600?
Computer OS: ?Windows 10?

Description:

When I use "Serial1.begin(9600);" ,ESP32C3 reboot forever.

Sketch: (leave the backquotes for code formatting)

//Change the code below by your sketch
#include <Arduino.h>

void setup()
{
  Serial.begin(115200);
  Serial1.begin(9600);
}

void loop()
{
}

Debug Messages:

[12:58:06.227]收←◆ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x8 (TG1WDT_SYS_RST),boot:0xc (SPI_FAST_FLASH_BOOT)
Saved PC:0x40380082
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd6100,len:0x142c
load:0x403ce000,len:0xbe8
load:0x403d0000,len:0x292c
SHA-256 comparison failed:
Calculated: 382e1807e70f49d75fc0f369b096b655db26caa90c3a4372222295c5c880921f
Expected: 128706947ac2b0450ec378f21c43b80093368c6751e585ae0d834a044d6cc793
Attempting to boot anyway...
entry 0x403ce000
I (53) boot: ESP-IDF v4.4-dev-2030-gd93887f9f-dirty 2nd stage bootloader
I (53) boot: compile time 01:17:11
I (54) boot: chip revision: 3
I (54) boot_comm: chip revision: 3, min. bootloader chip revision: 0
I (61) qio_mode: Enabling default flash chip QIO
I (65) boot.esp32c3: SPI Speed      : 80MHz
I (69) boot.esp32c3: SPI Mode       : QIO
I (72) boot.esp32c3: SPI Flash Size : 4MB
W (76) boot.esp32c3: PRO CPU has been reset by WDT.
I (81) boot: Enabling RNG early entropy source...
I (85) boot: Partition Table:
I (88) boot: ## Label            Usage          Type ST Offset   Length
I (94) boot:  0 nvs              WiFi data        01 02 00009000 00005000
I (101) boot:  1 otadata          OTA data         01 00 0000e000 00002000
I (107) boot:  2 app0             OTA app          00 10 00010000 00140000
I (114) boot:  3 app1             OTA app          00 11 00150000 00140000
I (120) boot:  4 spiffs           Unknown data     01 82 00290000 00170000
I (127) boot: End of partition table
I (130) boot_comm: chip revision: 3, min. application chip revision: 0
I (137) esp_image: segment 0: paddr=00010020 vaddr=3c030020 size=08398h ( 33688) map
I (149) esp_image: segment 1: paddr=000183c0 vaddr=3fc8a600 size=01474h (  5236) load
I (152) esp_image: segment 2: paddr=0001983c vaddr=40380000 size=067dch ( 26588) load
I (164) esp_image: segment 3: paddr=00020020 vaddr=42000020 size=20224h (131620) map
I (185) esp_image: segment 4: paddr=0004024c vaddr=403867dc size=03ce0h ( 15584) load
I (188) esp_image: segment 5: paddr=00043f34 vaddr=50000000 size=00010h (    16) load
I (192) boot: Loaded app from partition at offset 0x10000
I (194) boot: Disabling RNG early entropy source...

[12:58:07.349]收←◆ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x8 (TG1WDT_SYS_RST),boot:0xc (SPI_FAST_FLASH_BOOT)
Saved PC:0x40380082
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd6100,len:0x142c
load:0x403ce000,len:0xbe8
load:0x403d0000,len:0x292c
SHA-256 comparison failed:
Calculated: 382e1807e70f49d75fc0f369b096b655db26caa90c3a4372222295c5c880921f
Expected: 128706947ac2b0450ec378f21c43b80093368c6751e585ae0d834a044d6cc793
Attempting to boot anyway...
entry 0x403ce000
I (53) boot: ESP-IDF v4.4-dev-2030-gd93887f9f-dirty 2nd stage bootloader
I (53) boot: compile time 01:17:11
I (54) boot: chip revision: 3
I (54) boot_comm: chip revision: 3, min. bootloader chip revision: 0
I (61) qio_mode: Enabling default flash chip QIO
I (65) boot.esp32c3: SPI Speed      : 80MHz
I (69) boot.esp32c3: SPI Mode       : QIO
I (72) boot.esp32c3: SPI Flash Size : 4MB
W (76) boot.esp32c3: PRO CPU has been reset by WDT.
I (81) boot: Enabling RNG early entropy source...
I (85) boot: Partition Table:
I (88) boot: ## Label            Usage          Type ST Offset   Length
I (94) boot:  0 nvs              WiFi data        01 02 00009000 00005000
I (101) boot:  1 otadata          OTA data         01 00 0000e000 00002000
I (107) boot:  2 app0             OTA app          00 10 00010000 00140000
I (114) boot:  3 app1             OTA app          00 11 00150000 00140000
I (120) boot:  4 spiffs           Unknown data     01 82 00290000 00170000
I (127) boot: End of partition table
I (130) boot_comm: chip revision: 3, min. application chip revision: 0
I (137) esp_image: segment 0: paddr=00010020 vaddr=3c030020 size=08398h ( 33688) map
I (149) esp_image: segment 1: paddr=000183c0 vaddr=3fc8a600 size=01474h (  5236) load
I (152) esp_image: segment 2: paddr=0001983c vaddr=40380000 size=067dch ( 26588) load
I (164) esp_image: segment 3: paddr=00020020 vaddr=42000020 size=20224h (131620) map
I (185) esp_image: segment 4: paddr=0004024c vaddr=403867dc size=03ce0h ( 15584) load
I (188) esp_image: segment 5: paddr=00043f34 vaddr=50000000 size=00010h (    16) load
I (192) boot: Loaded app from partition at offset 0x10000
I (194) boot: Disabling RNG early entropy source...

[Jason2866]

Flash mode looks strange. Looks like a mismatch between mode DIO and QIO.
Try mode DOUT

[lybgo]

Flash mode looks strange. Looks like a mismatch between mode DIO and QIO.
Try mode DOUT

My test code is the following simple lines, can you tell me which code to add to solve?

void setup(){
  Serial.begin(115200);
  Serial1.begin(9600);
}
void loop(){
}

[Jason2866]

In Arduino IDE menu there should be the option to select the flash mode. I do not use Arduino IDE so maybe it is somewhere else to select the flash mode

[lybgo]

In Arduino IDE menu there should be the option to select the flash mode. I do not use Arduino IDE so maybe it is somewhere else to select the flash mode

I've tried all the Flash modes (QIO,DIO,DOUT,QOUT), but it still doesn't work out.

[atanisoft]

@lybgo Try passing in pin numbers to use for Serial1. The defaults being picked (TX:17, RX: 18) overlap with the on-board flash (at least TX does) and that is why you are seeing a consistent reboot.

Try:
Serial1.begin(9600, SERIAL_8N1, 18, 19);

Note that pins 18 and 19 are also used for USB-JTAG.

[lybgo]

@atanisoft I have tried your method, C3 will not restart constantly, but Serial1 cannot communicate, I have tried all pins (0-9,18,19).

[Eliott-17]

Same here,

Trying to use GPIO 2 & 3, nothing happend on the pins:

Serial1.begin(115200, SERIAL_8N1, RX1, TX1);
Serial1.println("BOOT");

[Eliott-17]

For the moment the only solution that I have: use function from ESP IDF into Arduino IDE, that works.

#include "C:\xxx\esp-idf\components\driver\include\driver\uart.h"

#define ECHO_UART_PORT_NUM UART_NUM_1
#define BUF_SIZE (1024)

void ESP32uart()
{
    const uart_port_t uart_num = ECHO_UART_PORT_NUM;
    uart_config_t uart_config = {
        .baud_rate = 115200,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_CTS_RTS,
       .rx_flow_ctrl_thresh = 122,
    };
    // Configure UART parameters
    ESP_ERROR_CHECK(uart_driver_install(ECHO_UART_PORT_NUM, BUF_SIZE * 2, 0, 0, NULL, 0));
    ESP_ERROR_CHECK(uart_param_config(ECHO_UART_PORT_NUM, &uart_config));
    ESP_ERROR_CHECK(uart_set_pin(ECHO_UART_PORT_NUM, 2, 3, -1, -1));
}

uart_write_bytes(ECHO_UART_PORT_NUM, &rxValue[0], 6);

[lbernstone]

You should not use headers from an external idf in arduino. #include <driver/uart.h> should work and can be trusted to not have missing or conflicting symbols.

[SuGlider]

HardwareSerial is currently under refactoring.
This will solve the current issue, as well as other problems.

Please hold for the news.
It will use IDF for future fast portability with current and new SoCs in the roadmap.

[SuGlider]

Guys, I have created a PR to solve this issues, as well as other Arduino UART issues.
I confirm that the PR solves C3 Serial1 issue.

IF you want to try it and comment on the PR, please use
https://github.com/SuGlider/arduino-esp32/tree/uart_refactoring
or PR #5549