STM32F107 I2C Not working

[aftab_s81]

Posted on November 11, 2014 at 14:54

Hello,

I am trying to interface a MEM on I2C of STM32F My code gets stuck when I read a register in the ''I2C_Reg_Write'' function below. It sticks at ''while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));'' event. My hardware connections are fine b/c I can test the same hardware with ''mikroC for ARM'' code.

After calling ''

I2C_Initialize

'' function, when I call ''

I2C_Reg_Write

'' function, it gets stuck at line Please help me to resolve this issue. Here is the I2C code. I have also attached the CoIDE project.

#include ''main.h''


//#define I2C_SLAVE_ADDR 0x53

//#define I2C_SPEED 100000


void I2C_Initialize(int I2C_SLAVE_ADDR, unsigned long I2C_SPEED)

{

GPIO_InitTypeDef GPIO_InitStructure;

I2C_InitTypeDef I2C_InitStructure;


// I2C @ PORTB. I2C_SCL=PB6, I2C_SDA=PB7.

RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);


RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;

GPIO_Init(GPIOB, &GPIO_InitStructure);


// reset i2c1

//RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, DISABLE);

//RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);


I2C_DeInit(I2C1);


// I2C configuration

I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;

I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;

I2C_InitStructure.I2C_OwnAddress1 = 0x00; //I2C_SLAVE_ADDR;

I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;

I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;


// Apply I2C configuration

I2C_Init(I2C1, &I2C_InitStructure);

// I2C Peripheral Enable

I2C_Cmd(I2C1, ENABLE);

}


char I2C_Reg_Read(uint8_t SensorAdd, uint8_t regAdd)

{

char I2C_Data;

// Send START condition

I2C_GenerateSTART(I2C1, ENABLE);

// Test on EV5 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

// Send sensor address

I2C_Send7bitAddress(I2C1, SensorAdd, I2C_Direction_Transmitter);

// Test on EV6 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

// Send register address

I2C_SendData(I2C1, regAdd);

// Test on EV8 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

// Send START condition a second time

I2C_GenerateSTART(I2C1, ENABLE);

// Test on EV5 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

// Send Sensor address for read

I2C_Send7bitAddress(I2C1, SensorAdd, I2C_Direction_Receiver);

// Test on EV6 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

// While there is data to be read

// Read a byte

if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))

{

//putsUSART(''something received..'');


I2C_Data = I2C_ReceiveData(I2C1);

// send acknowledge

//I2C_AcknowledgeConfig(I2C1, ENABLE);

I2C_AcknowledgeConfig(I2C1, DISABLE);

// send stop signal

I2C_GenerateSTOP(I2C1, ENABLE);



}

else {

I2C_Data = 0;

}


return I2C_Data;

}


void I2C_Reg_Write(uint8_t SensorAdd, uint8_t regAdd, uint16_t ByteToWrite)

{

//while(!I2C_CheckEvent(I2C1, I2C_E));

// Send START condition

I2C_GenerateSTART(I2C1, ENABLE);

// Test on EV5 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

// Send sensor address

I2C_Send7bitAddress(I2C1, SensorAdd, I2C_Direction_Transmitter);

// Test on EV6 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

// Send register address

I2C_SendData(I2C1, regAdd);

// Test on EV8 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

// send reg data

I2C_SendData(I2C1, ByteToWrite);

// Test on EV8 and clear it

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

// Send STOP Condition

I2C_GenerateSTOP(I2C1, ENABLE);

}

#i2c #stm32f017

[Amel NASRI]

Posted on November 12, 2014 at 16:25

What is about the I2C flags?

-Mayla-

[aftab_s81]

Posted on November 13, 2014 at 06:11

Mayla,

What do you mean by that? Please elaborate what specific information do I need to provide here.