Posted on April 21, 2006 at 09:57Hallo,
I am trying to get a ST0676 connected to a STR710 working.
The first time I read for instance, the Version register of the ST0676
everything is ok, but on the second access the read bit in the address is always set.
I use the STR7x Library and the following code:
void I2cInit(I2C_TypeDef *I2Cx, int Clock)
{
I2C_Init(I2Cx);
I2C_FCLKConfig (I2C0);
I2C_OnOffConfig (I2C0, ENABLE);
I2C_SpeedConfig (I2C0, Clock);
I2C_AddressConfig (I2C0, 0x0C0, I2C_Mode7);
I2C_AcknowledgeConfig (I2C0, ENABLE);
}
int I2cRead(I2C_TypeDef *I2Cx, int cmdLen, int readLen, unsigned char *bufp)
{
I2C_Tx_Status sendaddress,bSendResult;
I2C_Rx_Status rxStatus;
int i, I2CStatus;
I2cInit(I2Cx, 4000);
I2C_STARTGenerate(I2Cx, ENABLE);
while(I2C_FlagStatus(I2Cx, DIRECT, I2C_SB ) == RESET);
I2C_AddressSend(I2Cx, bufp[0], I2C_Mode7, I2C_TX);
//Test on the status of transmission
while(sendaddress != I2C_TX_ADD_OK) {
sendaddress = I2C_TransmissionStatus(I2Cx);
}
while(I2C_FlagStatus(I2Cx, DIRECT, I2C_ENDAD) == RESET);
I2C_FlagClear(I2Cx, I2C_ENDAD);
for(i = 1; i < cmdLen; i++) {
I2C_ByteSend(I2Cx, bufp[i]) ;
//Test on the status of transmission
while(bSendResult != I2C_TX_DATA_OK) {
bSendResult = I2C_TransmissionStatus(I2Cx);
}
}
//Stop the transmission
I2C_STOPGenerate (I2Cx, ENABLE);
// delay for the ST0676
ctl_timeout_wait(DELAY(10));
I2C_STARTGenerate(I2Cx, ENABLE);
while(I2C_FlagStatus(I2Cx, DIRECT, I2C_SB ) == RESET);
// send register address
I2C_AddressSend(I2Cx, bufp[0], I2C_Mode7, I2C_RX);
//Test on the status of transmission
while(I2C_FlagStatus(I2Cx, DIRECT, I2C_ENDAD ) == RESET);
I2C_FlagClear(I2Cx, I2C_ENDAD);
for(rxStatus = 0, i = 0; i < readLen - 1; i++) {
//Test on the status of transmission
while(rxStatus != I2C_RX_DATA_OK) {
rxStatus = I2C_ReceptionStatus(I2Cx);
}
// get the byte received
bufp[i] = I2C_ByteReceive(I2Cx);
}
// receive last byte
I2C_AcknowledgeConfig (I2C0, DISABLE);
bufp[i] = I2C_ByteReceive(I2Cx);
i++;
//Stop the transmission
I2C_STOPGenerate(I2Cx, ENABLE);
I2C_OnOffConfig(I2Cx, DISABLE);
return i;
}
I hope there is anybody who give me and idea what’s wrong.
Regards,
ctk
