I2C routines help !!!

[jsayavong]

Posted on May 25, 2006 at 01:30

I2C routines help !!!

[jsayavong]

Posted on May 25, 2006 at 01:30

Could some experts in this forum kindly

take a look at my I2C routines below.

The problems are:

config_I2C1() ..... not sure if this correct

write_I2C_configuration_PCA9555() ..... write the wrong value !!!

read_I2C_PCA9555() ..... my system hang as soon as the

function is called !!!

Here is the code:

////////////////////////////////////////////////////////////////////////

void config_I2C1(void)

{

GPIO_Config(GPIO0, I2C_SCL|I2C_SDA, GPIO_AF_OD); //Open-drain output for SCL (P0.2), SDA (P0.3)

I2C_Init(I2C1); //Initialize I2C1

I2C_FCLKConfig(I2C1); //Config I2C freq. according for FCLK freq.

I2C_OnOffConfig(I2C1, ENABLE); //Enable I2C Peripheral

I2C_SpeedConfig(I2C1,90000); //Select I2C Clock speed = 100khz

I2C_AcknowledgeConfig(I2C1, ENABLE); //Enable Acknowledge feature

}

///======================================================//

void write_I2C_configuration_PCA9555(void) // Set both PORTS as INPUT --- Send 4-bytes

{

I2C_STARTGenerate(I2C1, ENABLE); //start condition

while (I2C_FlagStatus (I2C1,DIRECT,I2C_SB) == RESET); //Check Start bit Flag

I2C_AddressSend(I2C1, 0x40, I2C_Mode7, I2C_TX); //Send PCA9555 ADX Write = 0x40

while (I2C_FlagStatus (I2C1,DIRECT,I2C_ENDAD) == RESET); //Check End-of-address xmit

I2C_FlagClear(I2C1, I2C_ENDAD); //Clear Flag

I2C_ByteSend(I2C1, 0x06); //Send CMD 0x06 -- Port Configuration

while (I2C_FlagStatus (I2C1,DIRECT,I2C_BTF) == RESET); //Check byte-transfer-finish flag

I2C_ByteSend(I2C1, 0xff); //Send 0xff -- Set Port0 as Input

while (I2C_FlagStatus (I2C1,DIRECT,I2C_BTF) == RESET); //Check byte-transfer-finish flag

I2C_ByteSend(I2C1, 0xff); //Send 0xff --Set Port1 as Input

while (I2C_FlagStatus (I2C1,DIRECT,I2C_BTF) == RESET); //Check byte-transfer-finish flag

I2C_STOPGenerate(I2C1,ENABLE); //Stop Condition

}

////=====================================================//

void read_I2C_PCA9555(void)

{

I2C_STARTGenerate(I2C1, ENABLE); //start condition

while (I2C_FlagStatus (I2C1,DIRECT,I2C_SB) == RESET);

I2C_AddressSend(I2C1, 0x40, I2C_Mode7, I2C_TX); //Send PCA9555 ADX Write = 0x40

while (I2C_FlagStatus (I2C1,DIRECT,I2C_ENDAD) == RESET);

I2C_FlagClear(I2C1, I2C_ENDAD);

I2C_ByteSend(I2C1, 0x00); //Send CMD 0x00 -- Port0 Input Register

while (I2C_FlagStatus (I2C1,DIRECT,I2C_BTF) == RESET);

I2C_STARTGenerate(I2C1, ENABLE); //Re-start condition

while (I2C_FlagStatus (I2C1,DIRECT,I2C_SB) == RESET);

I2C_AddressSend(I2C1, 0x41, I2C_Mode7, I2C_RX); //Send PCA9555 ADX Read = 0x41

while (I2C_FlagStatus (I2C1,DIRECT,I2C_ENDAD) == RESET);

I2C_FlagClear(I2C1, I2C_ENDAD);

PCA9555_port0 = I2C_ByteReceive(I2C1); //Receive 1st Byte (Port0 of PCA9555)

PCA9555_port1 = I2C_ByteReceive(I2C1); //Receive 2nd Byte (Port1 of PCA9555)

I2C_AcknowledgeConfig(I2C1, DISABLE); //none-ACK

I2C_STOPGenerate(I2C1,ENABLE); //Stop Condition

///========================================================//