#define ADDR_24CXX 0xA0
void I2C_24CXX_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
/* GPIOB Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOB, ENABLE);
/* I2C1 Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
/* Configure I2C1 pins: SCL and SDA */
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);
I2C_DeInit(I2C1);
/* I2C1 Init */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 200000;
I2C_Init(I2C1, &I2C_InitStructure);
/* I2C1 Init */
I2C_Cmd(I2C1, ENABLE);
}
//void I2C_24C512_Write(u8 RegName, u16 RegValue)
void I2C_24CXX_Write(u16 nAddr, u8* pDat, u16 nLen)
{
u16 i = 0;
/* Enable I2C1 acknowledgement if it is already disabled by other function */
I2C_AcknowledgeConfig(I2C1, ENABLE);
/*----- Transmission Phase -----*/
/* Send I2C1 START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on I2C1 EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /* EV5 */
{
}
/* Send slave address for write */
I2C_Send7bitAddress(I2C1, ADDR_24CXX, I2C_Direction_Transmitter);
/* Test on I2C1 EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* EV6 */
{
}
/* Send the high part of memory address */
/* I2C_SendData(I2C1, (u8)(nAddr>>8));
// Test on I2C1 EV8 and clear it
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) // EV8
{
}
*/
/* Send the low part of memory address */
I2C_SendData(I2C1, (u8)nAddr);
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
for(i=0;i<nLen;i++)
{
/* Send I2C1 data */
I2C_SendData(I2C1, pDat);
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
}
/* Send I2C1 STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}
void I2C_24CXX_Read(u16 nAddr, u8* pDat, u16 nLen)
{
u16 i = 0;
/* Enable I2C1 acknowledgement if it is already disabled by other function */
I2C_AcknowledgeConfig(I2C1, ENABLE);
/*----- Transmission Phase -----*/
/* Send I2C1 START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on I2C1 EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /* EV5 */
{
}
/* Send 24CXX slave address for write */
I2C_Send7bitAddress(I2C1, ADDR_24CXX, I2C_Direction_Transmitter);
/* Test on I2C1 EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* EV6 */
{
}
/* // Send the high part of memory address
I2C_SendData(I2C1, (u8)(nAddr>>8));
// Test on I2C1 EV8 and clear it
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) // EV8
{
}
*/
/* Send the low part of memory address */
I2C_SendData(I2C1, (u8)nAddr);
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
/*----- Reception Phase -----*/
/* Send Re-STRAT condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /* EV5 */
{
}
/* Send 24CXX slave address for read */
I2C_Send7bitAddress(I2C1, ADDR_24CXX, I2C_Direction_Receiver);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) /* EV6 */
{
}
for(i=0;i<nLen;i++)
{
if((i+1)>=nLen)
{
/* Disable I2C1 acknowledgement */
I2C_AcknowledgeConfig(I2C1, DISABLE);
/* Send I2C1 STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}
/* Test on EV7 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) /* EV7 */
{
}
/* Store I2C1 received data */
pDat = I2C_ReceiveData(I2C1);
}
}
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