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