void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
/* Just call into the Altera support function, which has its own parameters,
so the parameters passed in here are not used. */
( void ) pxPort;
uart0_print( ( char * ) pcString );
}
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
{
char cOutBytes[ 2 ];
/* Just call into the Altera support function, which has its own parameters,
so the parameters passed in here are not used. */
( void ) pxPort;
cOutBytes[ 0 ] = cOutChar;
cOutBytes[ 1 ] = 0x00;
uart0_print( cOutBytes );
return pdPASS;
}
uint16_t max31855_read()
{
MAX31855_t max31855;
uint8_t data[4];
//Switch CS to low to initiate data transfer
MAX31855_CS_PORT &= ~(1<<MAX_31855_CS_PIN_1);
//Get bits D31 to D24
spi_master_transmit(0xFF);
data[0] = SPDR;
//Get bits D23 to D16
spi_master_transmit(0xFF);
data[1] = SPDR;
//Get bits D15 to D8
spi_master_transmit(0xFF);
data[2] = SPDR;
//Get bits D7 to D0
spi_master_transmit(0xFF);
data[3] = SPDR;
//Switch CS back to high to end data transfer
MAX31855_CS_PORT |= (1<<MAX_31855_CS_PIN_1);
#ifdef DEBUG_BUILD
char buffer[8];
uart0_print("Raw Value: ");
itoa(data[0], buffer, 16); uart0_print(buffer); uart0_print(" ");
itoa(data[1], buffer, 16); uart0_print(buffer); uart0_print(" ");
itoa(data[2], buffer, 16); uart0_print(buffer); uart0_print(" ");
itoa(data[3], buffer, 16); uart0_print(buffer); uart0_print(" ");
uart0_print(", ");
#endif
//The two most significant bytes hold the thermocouple temp
max31855.thermocoupleTemp = ((data[0]<<8)|(data[1]));
//Check if the value is negative
if((max31855.thermocoupleTemp & 0x8000) == 0x8000)
max31855.signBit = 1;
//Check if the fault bit(Bit 16) is 1
if((max31855.thermocoupleTemp & 0x0001) == 0x0001)
{
max31855.faultBit = 1;
#ifdef DEBUG_BUILD
uart0_print("Fault Detected, ");
#endif
}
//Shift out bits D16 and D17
max31855.thermocoupleTemp = (max31855.thermocoupleTemp >> 2);
return max31855.thermocoupleTemp;
}
