STM32F4 I2C

[setartarney]

Posted on August 18, 2014 at 18:11

Hi, I want to communicate with an i2c eeprom, I am able to send the first data but not the second.

it seems that the buffer is full or there is another error somewere. Does anyone have an idea?

#include ''stm32f4xx.h''
#include ''stm32f4xx_i2c.h''
#include ''stm32f4xx_gpio.h''
int i;
void gpio_init()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOG, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_Init(GPIOG, &GPIO_InitStructure);
}
void set_I2C()
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);
I2C_DeInit(I2C1);
I2C_Cmd(I2C1, DISABLE);
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 10;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);
I2C_ITConfig(I2C1, I2C_IT_BUF, ENABLE);
I2C_ITConfig(I2C1, I2C_IT_ERR, ENABLE);
}
void I2C_start(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction){
// wait until I2C1 is not busy any more
while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));
// Send I2C1 START condition
I2C_GenerateSTART(I2Cx, ENABLE);
// wait for I2C1 EV5 --> Slave has acknowledged start condition
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));
// Send slave Address for write
I2C_Send7bitAddress(I2Cx, address, direction);
/* wait for I2Cx EV6, check if
* either Slave has acknowledged Master transmitter or
* Master receiver mode, depending on the transmission
* direction
*/
if(direction == I2C_Direction_Transmitter){
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
}
else if(direction == I2C_Direction_Receiver){
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
}
}
void I2C_startlec(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction){
// wait until I2C1 is not busy any more
//while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));
// Send I2C1 START condition
I2C_GenerateSTART(I2Cx, ENABLE);
// wait for I2C1 EV5 --> Slave has acknowledged start condition
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));
// Send slave Address for write
I2C_Send7bitAddress(I2Cx, address, direction);
/* wait for I2Cx EV6, check if
* either Slave has acknowledged Master transmitter or
* Master receiver mode, depending on the transmission
* direction
*/
if(direction == I2C_Direction_Transmitter){
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
}
else if(direction == I2C_Direction_Receiver){
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
}
}
void I2C_write(I2C_TypeDef* I2Cx, uint8_t data)
{
// wait for I2C1 EV8 --> last byte is still being transmitted (last byte in SR, buffer empty), next byte can already be written
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTING));
I2C_SendData(I2Cx, data);
}
uint8_t I2C_read_nack(I2C_TypeDef* I2Cx){
// disable acknowledge of received data
// nack also generates stop condition after last byte received
// see reference manual for more info
I2C_AcknowledgeConfig(I2Cx, DISABLE);
I2C_GenerateSTOP(I2Cx, ENABLE);
// wait until one byte has been received
while( !I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED) );
// read data from I2C data register and return data byte
uint8_t data = I2C_ReceiveData(I2Cx);
return data;
}
void I2C_stop(I2C_TypeDef* I2Cx){
// Send I2C1 STOP Condition after last byte has been transmitted
I2C_GenerateSTOP(I2Cx, ENABLE);
// wait for I2C1 EV8_2 --> byte has been transmitted
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}
int main(void)
{
set_I2C();
//I2C1_init(); // initialize I2C peripheral
uint8_t received_data;
I2C_start(I2C1, 0b10100000, I2C_Direction_Transmitter); // start a transmission in Master transmitter mode
I2C_write(I2C1, 0b00000000);
I2C_write(I2C1, 0b00000000);

I2C_stop(I2C1); // sto
while(1);
/*I2C_start(I2C1,0b10100000,I2C_Direction_Transmitter);
I2C_write(I2C1, 0b00000000);
I2C_write(I2C1, 0b11111111);
I2C_write(I2C1, 0b00000000);
I2C_stop(I2C1);
I2C_ClearFlag( I2C1, I2C_FLAG_BUSY);
I2C_start(I2C1, 0b10100000, I2C_Direction_Transmitter);
I2C_write(I2C1, 0b00000000);
I2C_startlec(I2C1, 0b10100001, I2C_Direction_Receiver);
I2C_read_nack(I2C1);*/
}