I have I2C working properly, but can't seem to figure out how to recover the bus and get it to working again if I test for the presence of a device that is not on the bus and therefore I2C_Mem_Read() returns HAL_ERROR. There are other devices on the bus, but HAL_ERROR seems to be latched and calling MX_I2C4_Init() again doesn't undo it and allow a retry. The project is built with EWARM 9.30.1 and STMCubeMX 6.11.0.
Suggestions?
Background: I know this is working and checked it against an oscilloscope/protocol analyzer; what's happened is that one of my 2 I2C devices is unplugged and I want to recover from the error.
I2CResult = HAL_I2C_Mem_Write(&hi2c4, (0x22<<1)|0x01, 0x0C, 1, ExpanderConfig, 1, 100);
(device is on I2C4 pins, i2c address is 0x22, register address is 0x0C, address size is 1, we are writing 1 byte of ExpanderConfig, an array, and waiting 100ms for timeout)
I2CResult = HAL_I2C_Mem_Read(&hi2c4, 0x47<<1, 0x08, 1, BufConfig,3,100);
(reading on i2c4 pins, i2c address is 0x47, register address is 0x08, address size is 1, BufConfig is a 3 byte array, and we time out in 100ms.)
