read-byte
xod/i2c/read-byte
Reads the next byte received from an I²C device after `request` succeeded.
Possible errors:
- Can't read byte
read-byte
@/read-byte
Reads the next byte received from an I²C device after `request` succeeded.
Possible errors:
- Can't read byte
I2C@/i2c
I²C interface object
READpulse
Triggers the read. Use another `read-byte` or `request` as a source signal.
DONEpulse
Pulses when read completes successfully. When multiple bytes should be read, send it to the next `read-byte` node in a chain.
BYTEbyte
The byte read
C++ implementation
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_READ
#pragma XOD error_raise enable
node {
void evaluate(Context ctx) {
if (!isInputDirty<input_READ>(ctx))
return;
auto wire = getValue<input_I2C>(ctx);
if (!wire->available()) {
raiseError(ctx);
return;
}
auto res = wire->read();
if (res == -1) {
raiseError(ctx); // Can't read byte
return;
}
emitValue<output_BYTE>(ctx, (uint8_t)res);
emitValue<output_DONE>(ctx, 1);
}
}