I am getting -1 on the screen when I save an unint32 and read it back? I am using BLEnano

[jay]

uint32_t value = 99999;

lcd.clear(); lcd.setPosition(0,1); lcd.printf("Writing bytes 0-16\n");

i2c.start();

data[0] = 0; data[1] = 0;
data[2] = ((value >> 24) & 0xFF); i2c.write(0xA0, data, 3); wait (0.1);

data[0] = 0; data[1] = 1;
data[2] = ((value >> 16) & 0xFF); i2c.write(0xA0, data, 3); wait (0.1);

data[0] = 0; data[1] = 2;
data[2] = ((value >> 8) & 0xFF); i2c.write(0xA0, data, 3); wait (0.1);

data[0] = 0; data[1] = 3;
data[2] = (value & 0xFF); i2c.write(0xA0, data, 3); wait (0.1);

//READ //Setting read pointer to 0 value = 0; data[0] = 0; // MSB address data[1] = 0; // LSB address

i2c.write(0xA0, data, 2);

char response[4]; i2c.read(0xA0+0x01, response, 4); value = ((response[0]<<24) | (response[1]<<16) | (response[2]<<8) | response[3]);

lcd.clear(); lcd.setPosition(0,0); lcd.printf("%d", value); wait(5);

[dingari]

I honestly don't think there is a reason to think there's a fault in the I2C implementation. Can you post your application code? Also, is there a specific reason you're using SoftI2C instead of just the I2C mbed class?

[dingari]

If you get non-zero return values from the I2C functions, that means the slave isn't responding. So it's probably a configuration issue.