Wemos D1 Mini - Build error: ld returned 1 exit status

1

Hello,
Im now try platformio with visual studio code. I use a wemos d1 mini board. Use rtos.

My code is (in main.cpp):

#include "esp_common.h"

#include "freertos/task.h"

#include "gpio.h"

void setup() {

}

void loop() {

}

Any idea?

Regards

2

Full error message and platformio.ini?

3

Hi maxgerhardt, thanks for your reply.
platformio.ini is
[env:d1_mini]

platform = espressif8266

board = d1_mini

framework = esp8266-rtos-sdk

monitor_speed=115200

Full error message:

Processing d1_mini (platform: espressif8266; board: d1_mini; framework: esp8266-rtos-sdk)
------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/espressif8266/d1_mini.html
PLATFORM: Espressif 8266 > WeMos D1 R2 and mini
HARDWARE: ESP8266 80MHz 80KB RAM (4MB Flash)
Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF MODES: FINDER(chain) COMPATIBILITY(soft)
Collected 0 compatible libraries
Scanning dependencies...
No dependencies
Linking .pioenvs\d1_mini\firmware.elf
C:\Users\info\.platformio\packages\framework-esp8266-rtos-sdk\lib\libmain.a(app_main.o): In function `uart_rx_one_char':
(.irom0.text+0x3e4): undefined reference to `user_init'
C:\Users\info\.platformio\packages\framework-esp8266-rtos-sdk\lib\libmain.a(app_main.o): In function `uart_rx_one_char':
(.irom0.text+0x3fb): undefined reference to `user_init'
C:\Users\info\.platformio\packages\framework-esp8266-rtos-sdk\lib\libmain.a(app_main.o): In function `flash_data_check':
(.irom0.text+0x57c): undefined reference to `user_rf_cal_sector_set'
C:\Users\info\.platformio\packages\framework-esp8266-rtos-sdk\lib\libmain.a(app_main.o): In function `flash_data_check':
(.irom0.text+0x6d0): undefined reference to `user_rf_cal_sector_set'
collect2.exe: error: ld returned 1 exit status
*** [.pioenvs\d1_mini\firmware.elf] Error 1
======================================================= [ERROR] Took 2.43 seconds =======================================================
The terminal process terminated with exit code: 1

Thanks!

4

You’re writing for the ESP8266 RTOS SDK, not Arduino. So your files have to be .c and you to have a function user_init() and user_rf_cal_sector_set(). See the example at platform-espressif8266/examples/esp8266-rtos-sdk-blink at develop · platformio/platform-espressif8266 · GitHub.

5

Perfect, now build correctly
But now cant work Serial.begin, Serial.print, etc. Also, is available software serial library for this sdk?
Regards

6

Probably need to look at some of the examples from the ESP8266_RTOS_SDK since you’re still thinking about Arduino-land stuff :wink: i.e. the uart_echo example should give you enough ideas on what to do for serial output… i.e. it looks like you use uart_param_config(), uart_driver_install() to set up the UART and uart_write_bytes() to write to it.