//Same as the previous function, except that it reads multiple registers and stores them in data
//The code must ensure that *data is large enough to contain all read data
void DS1307RegisterRMult(uint8_t FirstReg, uint8_t NumReg, uint8_t *data){//Read from arbitrary number of registers
TWIStart();
TWIWrite(DS1307ADDRESS | (0 << 0));
TWIWrite(FirstReg);
TWIStart();
TWIWrite(DS1307ADDRESS | (1 << 0));
for(uint8_t i = 0; i < (NumReg - 1); i++){
data[i] = TWIReadACK();
}
data[NumReg] = TWIReadNACK();
}
void TWIRead(uint8_t address, uint8_t *data, uint8_t length)
{
//Start comms
TWIStart();
//Address slave for reading
TWIAddress(address, 0x01);
//Do not read last byte with ack
for(unsigned int ii = 0; ii < length; ++ii)
{
*data++ = TWIReadACK();
}
//Read last bit with nack
*data = TWIReadNACK();
//Generate stop
TWIStop();
}
// Gets the current percentage of the battery
void getBatteryPercentage(void){
TWIStart();
TWIWrite(DS2782EAddress);
// Average current
TWIWrite(0x10); // Current accumulation
TWIStart();
//Check status
TWIWrite(DS2782EAddress|0b00000001);
vcc = TWIReadACK() << 8;//}
vcc += TWIReadNACK();
vcc = vcc*(0.3125); // 6.25uVh/Rsns = 6.25u/20mOhm = 0.0003125Ah = 0.3125mAh = 1/3.2 = 312uA
vcc = (vcc * 100) / 300; // Converting to % (assumming 373mAh = 100% from experiment
TWIStop();
}
uint16_t ReadTemp(uint8_t var){
uint8_t addr = 0x90;
uint8_t regPtr = 0x00;
addr = addr & 0xFE;
TWIStart();
TWIWrite(addr);
TWIWrite(regPtr);
TWIStart();
TWIWrite(addr | 0x01);
uint8_t data1 = TWIReadACK();
uint8_t data2 = TWIReadNACK();
TWIStop();
uint8_t val = (data1 & 0x7F )<<1;
uint8_t add = (data2 & 0x80)>>7;
uint8_t sign = (data1 & 0x80)>>7;
uint16_t res = val | add;
res = res | ((uint16_t)sign) << 8;
return res;
}
uint16_t ReadWord( uint8_t deviceAddr, uint8_t regPtr ){
uint16_t data = 0;
uint8_t * datal = ((uint8_t*)&data);
uint8_t * datah = (((uint8_t*)&data)+1); // Step a bit forward, just like using an array
uint8_t reply;
int i = 0;
// Write Device Addr
// Device addr is built according to the scheme:
// 0011,A2,A1,A0,RW
// 0011 = 0x30
// A2,A1,A0 Mask = 0x0E
uint8_t addr = 0;
addr = 0x90 | ( deviceAddr & 0x0E );
// Set RW Bit for Reading
// addr = addr | 0x0C;
// addr = addr | 0x80;
// Write Device Addr, WRITING
i = 0;
for( ; i < RETRIES; i++ ){
TWIStart();
if ((reply = TWIGetStatus()) != TW_START){
TWIStop();
return ERROR;
}
TWIWrite(addr & 0xFE);
reply = TWIGetStatus();
if (reply == TW_MT_SLA_ACK){ // READ an ACK
break;
}else if (reply == TW_MT_SLA_NACK || reply == TW_MT_ARB_LOST ){
continue;
}else{
TWIStop();
return ERROR;
}
if( i == RETRIES -1 ){
TWIStop();
return ERROR;
}
}
// Write Register Addr
TWIWrite(regPtr);
reply = TWIGetStatus();
if (reply != TW_MT_DATA_ACK){ // READ an ACK
TWIStop();
return ERROR;
}
TWIStart();
TWIWrite(addr | 0x01);
//*datah = TWIReadACK();
uint8_t data1 = TWIReadACK();
if ((reply = TWIGetStatus()) != TW_MR_DATA_ACK){ // READ an ACK
TWIStop();
return ERROR;
}
//*datal = TWIReadNACK();
uint8_t data2 = TWIReadNACK();
if ((reply = TWIGetStatus()) != TW_MR_DATA_NACK){ // READ an ACK
TWIStop();
return ERROR;
}
TWIStop();
return data;
}
