/**
* Call this function to start the Transceiver without specifing new transmission data. Useful for restarting
* a transmission, or just starting the transceiver for reception. The driver will reuse the data previously put
* in the transceiver buffers. The function will hold execution (loop) until the TWI_ISR has completed with the
* previous operation, then initialize the next operation and return.
*/
void TWI_StartTransceiver(void) {
while (TWI_TransceiverBusy() ) {} // Wait until TWI is ready for next transmission.
TWI_statusReg.all = 0;
TWI_state = TWI_NO_STATE;
TWCR = (1 << TWEN) | // TWI Interface enabled.
(1 << TWIE) | (1 << TWINT) | // Enable TWI Interupt and clear the flag.
(1 << TWEA) | (0 << TWSTA) |
(0<<TWSTO) | // Prepare to ACK next time the Slave is addressed.
(0 << TWWC);
TWI_busy = 0;
}
/**
* Call this function to read out the received data from the TWI transceiver buffer. I.e. first call
* TWI_Start_Transceiver to get the TWI Transceiver to fetch data. Then Run this function to collect the
* data when they have arrived. Include a pointer to where to place the data and the number of bytes
* to fetch in the function call. The function will hold execution (loop) until the TWI_ISR has completed
* with the previous operation, before reading out the data and returning.
* If there was an error in the previous transmission the function will return the TWI State code.
*/
unsigned char TWI_GetDataFromTransceiver(uint8_t *msg, uint8_t msgSize) {
uint8_t i;
while (TWI_TransceiverBusy()) {} // Wait until TWI is ready for next transmission.
if(TWI_statusReg.lastTransOK) { // Last transmission completed successfully.
for (i = 0; i < msgSize; i++) { // Copy data from Transceiver buffer.
msg[ i ] = TWI_buf[ i ];
}
TWI_statusReg.RxDataInBuf = FALSE; // Slave Receive data has been read from buffer.
}
return(TWI_statusReg.lastTransOK);
}
extern uint8_t UpdateTime(dstime_t* current_time)
{
uint8_t result=0;
/*устанавливаем указатель DS1307
на нулевой адрес*/
twiBuf[0] = (DS1307_ADR<<1)|0; //адресный пакет
twiBuf[1] = 0; //адрес регистра
twiMsgSize = 2;
while(TWI_TransceiverBusy()); //ждем, когда TWI модуль освободится
twiState = TWI_NO_STATE ;
TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWSTA); //разрешаем прерывание и формируем состояние старт
while(TWI_TransceiverBusy());
/*считываем время с DS1307*/
twiBuf[0] = (DS1307_ADR<<1)|1;
twiMsgSize = 5;
while(TWI_TransceiverBusy()); //ждем, когда TWI модуль освободится
twiState = TWI_NO_STATE ;
TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWSTA); //разрешаем прерывание и формируем состояние старт
while(TWI_TransceiverBusy());
if(twiState == TWI_SUCCESS)
{
//if ((current_time->min != twiBuf[2]) && (current_time->hour != twiBuf[3]))
//{
//result = 1;
//}
//
current_time->min = twiBuf[2];
current_time->hour = twiBuf[3];
current_time->day = twiBuf[4];
}
return result;
}
/**
* Call this function to send a prepared message, or start the Transceiver for reception. Include
* a pointer to the data to be sent if a SLA+W is received. The data will be copied to the TWI buffer.
* Also include how many bytes that should be sent. Note that unlike the similar Master function, the
* Address byte is not included in the message buffers.
* The function will hold execution (loop) until the TWI_ISR has completed with the previous operation,
* then initialize the next operation and return.
*/
void TWI_StartTransceiverWithData(uint8_t *msg, uint8_t msgSize) {
unsigned char temp;
while (TWI_TransceiverBusy()) {} // Wait until TWI is ready for next transmission.
TWI_msgSize = msgSize; // Number of data to transmit.
for (temp = 0; temp < msgSize; temp++) { // Copy data that may be transmitted if the TWI Master requests data.
TWI_buf[ temp ] = msg[ temp ];
}
TWI_statusReg.all = 0;
TWI_state = TWI_NO_STATE;
TWCR = (1 << TWEN) | // TWI Interface enabled.
(1 << TWIE) | (1 << TWINT) | // Enable TWI Interupt and clear the flag.
(1 << TWEA) | (0 << TWSTA) |
(0 << TWSTO)| // Prepare to ACK next time the Slave is addressed.
(0 << TWWC);
TWI_busy = 1;
}
/**
* Call this function to fetch the state information of the previous operation. The function will hold execution (loop)
* until the TWI_ISR has completed with the previous operation. If there was an error, then the function
* will return the TWI State code.
*/
unsigned char TWI_GetStateInfo(void) {
while (TWI_TransceiverBusy()) {} // Wait until TWI has completed the transmission.
return (TWI_state); // Return error state.
}
