I've enabled the I2C controller and ask it to send a start condition on the bus, and it does, however, as soon as I write a data byte to the TX register, it releases the bus and raises an arbitration lost flag. How can this be possible when there is nothing on the bus and SDA is high the entire time?
// Enable port B clock
RCC->AHBENR |= 0x40000u;
// Set PB6 and 7 to alternate function
GPIOB->MODER |= (0x2u << GPIO_MODER_MODER6_Pos);
GPIOB->MODER |= (0x2u << GPIO_MODER_MODER7_Pos);
// Set alternate function to I2C
GPIOB->AFR[0] |= (0x4u << GPIO_AFRL_AFRL6_Pos);
// Enable I2C module clock
RCC->APB1ENR |= 0x200000;
// PRESC = 1, SCLL = 0x13, tSCLL = 20 x 250 nS = 5.0 uS, SCLH = 0xF, tSCLH = 16 x 250 nS = 4.0 uS, tSCL = 10 uS
// SDADEL = 2, tSDADEL = 2 x 250 nS = 500 nS, SDLDEL = 4, tSCLDEL = 5 x 250 nS = 1250 nS
I2C1->TIMINGR = 0x10540F13;
// Enable I2C
I2C1->CR1 = 0x01u;
// Start condition
I2C1->CR2 |= 0x52000u;
