Hi everyone: i received in these days a custom PCB i designed based on the STM32F411 microcontroller:
I wanted to experiment with such MCUs and make a custom board with them for the first time; i was also interested in making it compatible with the arduino framework through PlatformIO as i am already experienced with that environment.
I started running some tests and i turned out that i was able to program it in DFU mode and to use the serial monitor just fine; however the problems started when i tryed to use I2C sensors like this BME280 Breackout board i got from Amazon: i started simple by connecting it up to 3V3, same GND ans the STM32 board, and SDA and SCL according to the attached PCB schematic.
I also used this code in the platformio's main.c file:
#include <Arduino.h>
#include <Wire.h>
int nDevices = 0;
void setup() {
Wire.begin(PB7, PB6);
Serial.begin(115200);
delay(100);
pinMode(PC13, OUTPUT);
Serial.println("I2C pronto!");
// Scan I2C
byte error, address;
for (address = 1; address < 127; address++) {
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0) {
Serial.print("Device found on 0x");
Serial.println(address, HEX);
nDevices++;
}
delay(5); // Add small delay between attempts
}
}
void loop() {
if(nDevices != 0){
digitalWrite(PC13, !digitalRead(PC13));
delay(1000);
} else {
Serial.println("No I2C Device Found");
delay(1000);
}
}
and this in the platformio.ini file:
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:genericSTM32F411CE]
platform = ststm32
board = genericSTM32F411CE
framework = arduino
upload_protocol = dfu
build_flags =
-D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC
-D USBCON
-D HSE_VALUE=8000000
When the code runs it basically doesn't find any I2C devices connected.
Since this is my first time working with STM32 it's i made some mistake for sure, but i can't spot it.
Any help would be apreciated.
