Hopefully anyone is able to help me with my problem.
I'm currently setting um a I2C bus with a FT2232H as master and a STM32F407VGT6 (Discovery-Board) as a slave. I was able to send the slave address correctly from the master but I'm not sure if the slave is setup correctly because I dont get any ACK bit as a response from the slave. I was looking over the settings quite some times.
The start and stop conditions are sent correctly aswell.
Here is my code for the slave setup:
I2C_InitTypeDef i2c_init;
NVIC_InitTypeDef NVIC_InitStructure, NVIC_InitStructure2;
I2C_DeInit(I2C1);
I2C_SoftwareResetCmd(I2C1, ENABLE);
I2C_SoftwareResetCmd(I2C1, DISABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
gpio_init.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8;
gpio_init.GPIO_Mode = GPIO_Mode_AF;
gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
gpio_init.GPIO_PuPd = GPIO_PuPd_UP;
gpio_init.GPIO_OType = GPIO_OType_OD;
GPIO_Init(GPIOB, &gpio_init);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1); // SDA
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1); // SCL
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure2.NVIC_IRQChannel = I2C1_ER_IRQn;
NVIC_InitStructure2.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure2.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure2.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure2);
I2C_ITConfig(I2C1, I2C_IT_EVT, ENABLE);
I2C_ITConfig(I2C1, I2C_IT_ERR, ENABLE);
I2C_ITConfig(I2C1, I2C_IT_BUF, ENABLE);
i2c_init.I2C_ClockSpeed = 50000;
i2c_init.I2C_Mode = I2C_Mode_I2C;
i2c_init.I2C_DutyCycle = I2C_DutyCycle_2;
i2c_init.I2C_OwnAddress1 = 0x21;
i2c_init.I2C_Ack = I2C_Ack_Enable;
i2c_init.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &i2c_init);
I2C_StretchClockCmd(I2C1, ENABLE);
I2C_Cmd(I2C1, ENABLE);
And the address I'm sending should be correct like that. Thanks for your help :)
Edit: The problem might also be that the STM32F4 isn't reading the I2C lines. But If thats the case I have no idea which setting is wrong. Or do I need to start the peripheral in any way? I thought if the PE bit is set the I2C is running and responding automatically. Isn't that the case?
