request
xod/i2c/request
Requests N bytes from a given slave I²C device.
Possible errors:
— Invalid I2C address
request
@/request
Requests N bytes from a given slave I²C device.
Possible errors:
— Invalid I2C address
I2C@/i2c
I2C interface object
ADDRbyte
Slave device I²C address to request from
Nnumber
Number of bytes to request
SENDpulse
Sends the request
DONEpulse
Pulses when the request is successfully send. Send it to a `read-byte`.
C++ implementation
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_SEND
#pragma XOD error_raise enable
node {
void evaluate(Context ctx) {
if (!isInputDirty<input_SEND>(ctx))
return;
auto wire = getValue<input_I2C>(ctx);
auto addr = (uint8_t)getValue<input_ADDR>(ctx);
auto nBytes = (uint8_t)getValue<input_N>(ctx);
if (addr > 127) {
raiseError(ctx); // Invalid I2C address
return;
}
wire->requestFrom(addr, nBytes);
emitValue<output_DONE>(ctx, 1);
}
}