Posted on April 20, 2013 at 00:46Thanks for the clue.
I've done my lesson and calculated proper? values for the I2Cx_TIMINGR register basing on the examples from RM0316.
I'm trying to setup STM32F3 (discovery board) as slave in the interrupt mode (400KHz bus, hardware pullups) but interrupt is never called.
Could you please take a look at the excerpt from code.
static void I2C_Config(void)
{
//I2C_DeInit(I2C1); //Deinit and reset the I2C to avoid it locking up
//I2C_SoftwareResetCmd(I2C1);
/* Enable UART clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); // enabled in TIM_Config also
/* Reset I2Cx IP */
//RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
/* Release reset signal of I2Cx IP */
//RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
GPIO_InitTypeDef GPIO_InitStructure;
/* PB6 - SCL; PB7 - SDA */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_4);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_4);
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_InitTypeDef I2C_InitStructure;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = 0x50330309; // 400KHz | 8MHz-0x00310309; 16MHz-0x10320309; 48MHz-50330309
I2C_Init(I2C1, &I2C_InitStructure);
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the SPI interrupt priority */
NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable I2C */
I2C_Cmd(I2C1, ENABLE);
/* Enable Interrupts */
I2C_ITConfig(I2C1, I2C_IT_ADDRI | I2C_IT_RXI, ENABLE);
}
void I2C1_EV_IRQHandler(void)
{
...
}
Regards,
cholo
