#include "GPIO.h"

#include "I2C.h"

#include "stm32f4xx_gpio.h"

#include "stm32f4xx_i2c.h"

volatile unsigned short recieve[1024];

volatile int i = 1, x = 0;

void setup(I2C_TypeDef* I2Cx)

{

I2C_AcknowledgeConfig(I2Cx, ENABLE);

while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

I2C_GenerateSTART(I2Cx, ENABLE);

while(!I2C_GetFlagStatus(I2Cx, I2C_FLAG_SB));

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2Cx,0x6B<<1,I2C_Direction_Transmitter);

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_SendData(I2Cx, 0x00);

while(!I2C_GetFlagStatus(I2Cx,I2C_FLAG_TXE));

I2C_SendData(I2Cx,0x28);

while(!I2C_GetFlagStatus(I2Cx,I2C_FLAG_TXE));

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_GenerateSTOP(I2Cx, ENABLE);

while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_STOPF)); // stop bit flag

for(x = 0;x < 0xFFFFF;x++); //Delay

}

short read8(I2C_TypeDef* I2Cx){

uint8_t msb=0, lsb=0;

unsigned char dummy1;

unsigned short data;

I2C_AcknowledgeConfig(I2Cx, ENABLE);

while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

I2C_GenerateSTART(I2Cx, ENABLE);

while(!I2C_GetFlagStatus(I2Cx, I2C_FLAG_SB));

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2Cx,0x6B<<1,I2C_Direction_Transmitter);

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_SendData(I2Cx,0x28);

while(!I2C_GetFlagStatus(I2Cx,I2C_FLAG_TXE));

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_GenerateSTART(I2Cx, ENABLE);

while(!I2C_GetFlagStatus(I2Cx, I2C_FLAG_SB));

I2C_Send7bitAddress(I2Cx, 0x6B<<1, I2C_Direction_Receiver);

while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

msb = I2C_ReceiveData(I2Cx);

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));

I2C_NACKPositionConfig(I2Cx, I2C_NACKPosition_Current);

I2C_AcknowledgeConfig(I2Cx, DISABLE);

lsb = I2C_ReceiveData(I2Cx);

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));

//dummy1 = I2C_ReceiveData(I2Cx);

//while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));

I2C_GenerateSTOP(I2Cx, ENABLE);

while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_STOPF));

data = msb<<8;

data |= lsb;

return data;

}

void write8(I2C_TypeDef* I2Cx,uint8_t reg, uint8_t addr)

{

I2C_AcknowledgeConfig(I2Cx,ENABLE);

while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

I2C_GenerateSTART(I2Cx,ENABLE);

while(!I2C_GetFlagStatus(I2Cx, I2C_FLAG_SB));

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2Cx,0x6B<<1,I2C_Direction_Transmitter);

while(!I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_SendData(I2Cx,reg);

while(!I2C_GetFlagStatus(I2Cx,I2C_FLAG_TXE));

while(!I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_SendData(I2Cx,addr);

while(!I2C_GetFlagStatus(I2Cx,I2C_FLAG_TXE));

while(!I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_GenerateSTOP(I2Cx,ENABLE);

while(I2C_GetFlagStatus(I2Cx,I2C_FLAG_STOPF));

}

int main(void)

{

I2C_Initialize(I2C2,I2C_Ack_Enable,I2C_AcknowledgedAddress_7bit, 100000, I2C_DutyCycle_2, I2C_Mode_I2C, 0x00);

setup(I2C2);

write8(I2C2,0x20,0x0F);

unsigned short temp = 0;

while(1)

{

temp = read8(I2C2);

if(recieve[i-1] != temp){

recieve[i++] = temp;

if(i == 1024){

i = 0;

}

}

}

}