public async Task <double> ReadTemperature()
{
#region bits explained
// To line everything up for ease of reading back (on byte boundary) we
// will pad the command start bit with 7 leading "0" bits
// Write 0000000S GDDDxxxx xxxxxxxx
// Read ???????? ?????N98 76543210
// S = start bit
// G = Single / Differential
// D = Chanel data
// ? = undefined, ignore
// N = 0 "Null bit"
// 9-0 = 10 data bits
// 0000 01 = 7 pad bits, start bit
// 1000 0000 = single ended, channel bit 2, channel bit 1, channel bit 0, 4 clocking bits
// 0000 0000 = 8 clocking bits
#endregion
var writeBuffer = new byte[3] {
0b00000001, 0b10000000, 0b00000000
}; /* we will hold the command to send to the chipbuild this in the constructor for the chip we are using */
var readBuffer = new byte[3] {
0b00000000, 0b00000000, 0b00000000
}; /* this is defined to hold the output data*/
Pi.Spi.Channel0Frequency = SpiChannel.MinFrequency;
readBuffer = await Pi.Spi.Channel0.SendReceiveAsync(writeBuffer);
return(SensorsHelper.ToTemperature(readBuffer));
}
public async Task <double> ReadInfrared()
{
var writeBuffer = new byte[3] {
0b00000001, 0b10100000, 0b00000000
};
var readBuffer = new byte[3] {
0b00000000, 0b00000000, 0b00000000
};
Pi.Spi.Channel0Frequency = SpiChannel.MinFrequency;
readBuffer = await Pi.Spi.Channel0.SendReceiveAsync(writeBuffer);
return(SensorsHelper.ToInfrared(readBuffer));
}
