I2C_4 seemingly broken

[jgoney]

I posted on the forum about this here, but tl;dr is that I can't get I2C_4 to work at all. I have no problems getting I2C_1 to work (on either set of supported pins), but I2C_4 does not work for me on either pin set.

I made a Gist for it here. If anyone could try it out just to sanity check it for me, that would already be a huge help.

Please let me know if you need any additional info or context.

[AndrewCapon]

It isn't working here either if it makes you feel any better :)

Here is the test code I am using:

#define TEST_I2C 4
int main(void)
{
	hw.Init();

	I2CHandle i2c;
        I2CHandle::Config i2c_config;

#if TEST_I2C == 4
	i2c_config.periph         = I2CHandle::Config::Peripheral::I2C_4;
	i2c_config.speed          = I2CHandle::Config::Speed::I2C_100KHZ;
	i2c_config.mode           = I2CHandle::Config::Mode::I2C_MASTER;
	i2c_config.pin_config.scl = hw.GetPin(13);
	i2c_config.pin_config.sda = hw.GetPin(14);
	i2c_config.address        = 0x3C;	
#else
	i2c_config.periph         = I2CHandle::Config::Peripheral::I2C_1;
	i2c_config.speed          = I2CHandle::Config::Speed::I2C_100KHZ;
	i2c_config.mode           = I2CHandle::Config::Mode::I2C_MASTER;
	i2c_config.pin_config.scl = hw.GetPin(11);
	i2c_config.pin_config.sda = hw.GetPin(12);
	i2c_config.address        = 0x3C;	
#endif	
	i2c.Init(i2c_config);

	uint8_t data;
	while(1)
		i2c.TransmitBlocking(i2c_config.address, &data, 1, 1000); 

	return 0;
}

[AndrewCapon]

Ok, I think I have fixed it.

line 634 of i2c.cpp in libDaisy should be:

GPIO_InitStruct.Alternate = GPIO_AF6_I2C4;

not

GPIO_InitStruct.Alternate = GPIO_AF4_I2C4;

[AndrewCapon]

PR put in:

#628

[jgoney]

@AndrewCapon thanks for taking a look at this! I'll test your your fix as well on Monday. 👍🏻