9 years, 6 months ago.

I2C communication blocked between master and slave [NUCLEO boards]

Hello everyone, I'm trying to make 2 boards communicate but I'm facing an issue. After the second byte is sent no ack is received so the communication stops, how can i solve this?

Here is the master code:

1. include "mbed.h"

I2C i2c(PB_9,PB_8); sda, scl Serial pc(PA_2, PA_3);

const int addr = 0x78; define the I2C Address

int main() { char cmd[2]; pc.printf("INIXI"); i2c.frequency(100000); while(1) { i2c.write(addr, "xyz", 3); wait(1); } }

Here is the slave:

1. include "mbed.h"

I2CSlave slave(PB_9,PB_8); Serial pc(PA_2, PA_3); DigitalOut led1(LED1);

int main() { pc.printf("Welcome\n"); char buf[8] = {0}; char msg[] = "AHK"; int val;

slave.frequency(100000); slave.address(0x78); pc.printf("Starting program"); while (1) { int i = slave.receive(); if(i == 0) continue; pc.printf("Slave Receive: %d: \n", i); switch (i) { case I2CSlave::ReadAddressed: val = slave.write(buf, 4); Includes null char pc.printf("ReadAddressed: %d\n\r", val); break; case I2CSlave::WriteGeneral: val = slave.read(buf, 4); pc.printf("WriteGeneral: %d\n\r", val); break; case I2CSlave::WriteAddressed: val = slave.read(buf, 6); pc.printf("WriteAdressed: %s\n\r", buf); for(int i = 0; i < 8; i ++) { pc.printf(" %d \t ", buf[i]); } break; } } }

MASTER: NUCLEO-F446RE SLAVE : NUCLEO-L476RG