digipot-read-wiper
xodballxod/digipot-mcp-spi/digipot-read-wiper
Read the steps from digipot wiper
Pot2 -> true for reading the 2nd wiper.
digipot-read-wiper
@/digipot-read-wiper
Read the steps from digipot wiper
Pot2 -> true for reading the 2nd wiper.
SPI@/spi
SPI class reference
CSport
CS (chip select) pin, can be any digital pin, to allow multiple devices.
Pot2boolean
False -> Wiper 0
True -> Wiper 1 (for devices with 2 wipers)
UPDpulse
Read the Wiper
OUTnumber
DONEpulse
C++ implementation
// used for MicroChip Technology MCP413X/415X/423X/425X SPI controlled digitial potentiometers and rheostats
// Reference for Wiring: http://www.learningaboutelectronics.com/Articles/MCP4131-digital-potentiometer-circuit.php
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_UPD
#pragma XOD error_raise enable
node {
void evaluate(Context ctx) {
if (!isInputDirty<input_UPD>(ctx))
return;
static_assert(isValidDigitalPort(constant_input_CS), "must be a valid digital port");
::pinMode(constant_input_CS, OUTPUT); // set pinmode output for Chip Select
auto digipot = getValue<input_SPI>(ctx);
::digitalWrite(constant_input_CS, false); // chip select active
uint16_t address = getValue<input_Pot2>(ctx) << 12;
uint16_t command = ( (uint16_t) 0b0011 ) << 10;
// uint16_t COMMAND_MASK = 0;
// uint16_t transferByte = 0;
// digipot->transfer((uint8_t) getValue<input_Address>(ctx)); // address
//digipot->transfer16( address | (uint16_t) getValue<input_STEP>(ctx)); // value
//uint16_t data = digipot->transfer16( 0b0001110000000000 ); // value
uint8_t data = digipot->transfer16( address | command ); // value
::digitalWrite(constant_input_CS, true); // chip select unactive
emitValue<output_OUT>(ctx, data ) ;
emitValue<output_DONE>(ctx, 1);
}
}