Alternate SERCOM I2C Not Working On Pins PA08 and PA09 (4 and 3)

[DeltaAerospace]

I2C is not working using PA08 and PA09 on the ATSAMD21G18A-AU with an Arduino Zero bootloader on a custom PCB.
-Tried Modified I2C Scanner
-Normal I2C on PA22 and PA23 still work

[wltue]

Works for me. Problems could be init in the library I had a lot of issues with external libraries if != Wire'0',
If the library tries to init the Wire remove the line (.begin) and add it manually in your setup.

Try manualy, this works:

`#include <arduino.h>
#include "wiring_private.h" // for pinPeripheral() function
#include <Wire.h>

TwoWire Wire1(&sercom2, // &PERIPH_WIRE
4, // PIN_WIRE_SDA
3); // PIN_WIRE_SCL

void setup() {

// Init Wire1
Wire1.begin();
Wire1.setClock(100000);
pinPeripheral(4, PIO_SERCOM_ALT);
pinPeripheral(3, PIO_SERCOM_ALT);

Serial1.begin(115200);
}

void loop() {

Wire1.beginTransmission(0x40);

Wire1.write(0b101010); // Sends value byte
Wire1.endTransmission(); // Stop transmitting

delay(500);
}
`
(set the parameters according to your i2c chip connected)

[DeltaAerospace]

Since I posted this, I’ve got it working. Thanks for the help.

…

On Mon, May 20, 2024 at 9:06 PM tse ***@***.***> wrote: Works for me. Problems could be init in the library I had a lot of issues with external libraries if != Wire'0', If the library tries to init the Wire remove the line (.begin) and add it manually in your setup. Try manualy, this works: `#include <arduino.h> #include "wiring_private.h" // for pinPeripheral() function #include <Wire.h> TwoWire Wire1(&sercom2, // &PERIPH_WIRE 4, // PIN_WIRE_SDA 3); // PIN_WIRE_SCL void setup() { // Init Wire1 Wire1.begin(); Wire1.setClock(100000); pinPeripheral(4, PIO_SERCOM_ALT); pinPeripheral(3, PIO_SERCOM_ALT); Serial1.begin(115200); } void loop() { Wire1.beginTransmission(0x40); Wire1.write(0b101010); // Sends value byte Wire1.endTransmission(); // Stop transmitting delay(500); } ` (set the parameters according to your i2c chip connected) — Reply to this email directly, view it on GitHub <#711 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BBIOT7A4OPSUBFTENMY57VLZDLXANAVCNFSM6AAAAAA6GMLEM6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMRRHEYDKMJZGA> . You are receiving this because you authored the thread.Message ID: ***@***.***>