Wire / I2C doesn't work on STM32F4 #1355
Description
Describe the bug
The Wire library doesn't work.
I'm monitoring the SDA, SCL pins with a logic analyzer and there aren't even any transitions. Both stay pulled up by the pull-up resistors.
Same result with both 1.8 and 1.9 versions of the core.
Possibly related to: #463
To Reproduce
I've tried the following combinations:
Wire, I2C1: (PB7, PB6), (PB9, PB8), (PA10, PA9)
TwoWire, I2C2: (PB11, PB10), (PB14, PB13)
Using the following code to test the library:
#include <Wire.h>
TwoWire Wire2(PB14, PB13);
HardwareSerial HWSerial2(PA3, PA2);
void setup() {
HWSerial2.begin(115200);
//Wire.setSDA(PA10);
//Wire.setSCL(PA9);
//Wire.begin();
Wire2.begin();
HWSerial2.println("\nI2C Scanner");
}
void loop() {
byte error, address;
int nDevices;
HWSerial2.println("Scanning...");
nDevices = 0;
for(address = 1; address < 127; address++) {
Wire2.beginTransmission(address);
error = Wire2.endTransmission();
if (error == 0) {
HWSerial2.print("I2C device found at address 0x");
if (address < 16)
HWSerial2.print("0");
HWSerial2.println(address, HEX);
nDevices++;
}
else if (error == 4) {
HWSerial2.print("Unknown error at address 0x");
if (address < 16)
HWSerial2.print("0");
HWSerial2.println(address, HEX);
}
}
if (nDevices == 0)
HWSerial2.println("No I2C devices found");
else
HWSerial2.println("done");
delay(1000);
}
Desktop:
- OS: Windows 10
- Arduino IDE version: 1.8.13
- STM32 core version: 1.9
- Upload method: STLink (STM32CubeProgrammer SWD)
Board:
- Name: STM32F407G-DISC1
Additional context
Using VL53L3CX board from Pololu for the test, but I don't think it's important.