int OneWire_PerformTemperatureConversion(void) {
uint8_t scratch[9];
if(resetbus()) {
xferbyte(OW_SKIP_ROM); // All devices on the bus are addressed here
xferbyte(OW_CONVERT_T);
setpin1();
BusyWait8(94000<<3); // For 9-bit resolution
for( int i = 0; i < numowdevices; i++ ) {
selectdevbyidx(i);
xferbyte(OW_READ_SCRATCHPAD);
for(uint32_t iter=0; iter<2; iter++) { // Only read two bytes
scratch[iter] = xferbyte(0xff);
//printf("%02x ",scratch[iter]);
}
int16_t tmp = scratch[1]<<8 | scratch[0];
devreadout[i] = tmp;
}
} else {
BusyWait8(94000<<3); // Maintain timing if no sensors are found for the time being
}
return numowdevices;
}
static int32_t OneWire_Work(void) {
static uint8_t mystate = 0;
uint8_t scratch[9];
int32_t retval = 0;
if (mystate == 0) {
uint32_t save = VIC_DisableIRQ();
if (resetbus()) {
xferbyte(OW_SKIP_ROM); // All devices on the bus are addressed here
xferbyte(OW_CONVERT_T);
setpin1();
//retval = TICKS_MS(94); // For 9-bit resolution
retval = TICKS_MS(100); // TC interface needs max 100ms to be ready
mystate++;
}
VIC_RestoreIRQ( save );
} else if (mystate == 1) {
for (int i = 0; i < numowdevices; i++) {
uint32_t save = VIC_DisableIRQ();
selectdevbyidx(i);
xferbyte(OW_READ_SCRATCHPAD);
for (uint32_t iter = 0; iter < 4; iter++) { // Read four bytes
scratch[iter] = xferbyte(0xff);
}
VIC_RestoreIRQ(save);
int16_t tmp = scratch[1]<<8 | scratch[0];
devreadout[i] = tmp;
tmp = scratch[3]<<8 | scratch[2];
extrareadout[i] = tmp;
}
mystate = 0;
} else {
retval = -1;
}
return retval;
}
