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uint8_t readDS1307Register(uint8_t regAddr) {
uint8_t data;
DL_I2C_fillControllerTXFIFO(I2C_INST, ®Addr, 1);
/* Wait for I2C to be Idle */
while (!(
DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_IDLE))
;
/* Send the packet to the controller.
* This function will send Start + Stop automatically.
*/
DL_I2C_startControllerTransfer(I2C_INST, DS1307_ADDRESS,
DL_I2C_CONTROLLER_DIRECTION_TX, 1);
/* Trap if there was an error */
if (DL_I2C_getControllerStatus(I2C_INST) &
DL_I2C_CONTROLLER_STATUS_ERROR) {
/* LED will remain high if there is an error */
__BKPT(0);
}
/* Wait for I2C to be Idle */
while (!(
DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_IDLE))
;
/* Add delay between transfers */
delay_cycles(100);
/* Send a read request to Target */
DL_I2C_startControllerTransfer(I2C_INST, DS1307_ADDRESS,
DL_I2C_CONTROLLER_DIRECTION_RX, 1);
while (DL_I2C_isControllerRXFIFOEmpty(I2C_INST));
data = DL_I2C_receiveControllerData(I2C_INST);
if (DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_ERROR) {
printf("I2C Okuma Hatasi!\n");
}
return bcdToDec(data);
}
int i2c_read(I2C_Regs *i2c, uint32_t targetAddr, uint8_t *buffer, uint16_t length, uint32_t timeOut)
{
/* Wait for I2C to be Idle */
while (!(
DL_I2C_getControllerStatus(i2c) & DL_I2C_CONTROLLER_STATUS_IDLE))
;
/* Send a read request to Target */
DL_I2C_startControllerTransfer(i2c, targetAddr,
DL_I2C_CONTROLLER_DIRECTION_RX, length);
/*
* Receive all bytes from target. LED will remain high if not all bytes
* are received
*/
for (uint8_t i = 0; i < length; i++) {
uint32_t tmpCnt = timeOut;
while (DL_I2C_isControllerRXFIFOEmpty(i2c)){
tmpCnt --;
/* Receiving time out */
if (tmpCnt == 0)
return -1;
}
buffer[i] = DL_I2C_receiveControllerData(i2c);
}
return 0;
}
