arduinoReadF
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## arduinoReadF

arduinoReadF — Read data from an arduino port using the Csound-Arduino protocol.

## Description

Plugin opcode in serial.

Read integer data from an arduino port with CsoundArduino protocol.

## Syntax

    kval arduinoReadF iPort, iStream1,
          iStream2, iStream3

## Performance

iPort -- port number obtained from a arduinoStart opcode.

iStream1, iStream2, iStream3 -- Numbers of the three data streams in the range 0 to 30. Each stream carries 10 bits of the 30 bits floating point result. The division is created in the Arduino sketch encapsulated in the put_float function.

kval -- floating point value read.

| Note
The value transmitted is two bits shorter in the mantissa than produced on the Arduino so there is a little error introduced.

## Examples

Here is an example of the arduinoReadF opcode. It uses the file arduinoReadF.csd.

Example 59. Example of the arduinoReadF opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    Arduino-Joystick2Csound1g-fm1-port (version with smoothing)

    - Push Joystick button to turn on note
    - Use JoystickX to offset and control the modulation index of
      the foscil opcode from 0-40 via the scale opcode
    - Use JoystickY to offset and control the Frequency of the foscil
      opcode up/down two octaves via the scale opcode

    <CsoundSynthesizer>

    <CsInstruments>

    sr = 44100
    ksmps = 441
    nchnls = 2
    0dbfs = 1

    giport init 0

    // NOTE: change USB port "/dev/cu.usbmodem1414301" to correspond
    //       with USB port used by Arduino on your system
    giport arduinoStart  "//dev/ttyACM0", 9600    // for GNULinux

    instr 1

    kk  arduinoReadF  giport, 1, 2, 3
    printks "kk=%f\n", 0.5, kk
     endin

    </CsInstruments>

    <CsScore>

    f 1 0 16384 10 1

    i 1 0 1

    e

    </CsScore>

    </CsoundSynthesizer>

    <arduinoSketch>
    // Float Example

    // John ffitch & Richard Boulanger
    // December 7, 2020

    // BreadBoard & Arduino Setup

    void setup() {
                  // NOTE: Digital pins can be either inputs or outputs.

      Serial.begin(9600);
    }

    // put_val( ) - a function to send data values to the Csound
    //              "arduinoRead" opcode
    // The first argument of the put_val function "int senChan" sets
    // the software channel number that Csound reads
    // NOTE: "senChan" does "not" define the input pin that is used on
    // the Arduino for a specific sensor
    // The specific Arduino input pin used by any sensor is assigned
    // and set elsewhere in the Arduino sketch and mapped to a
    // user-defined put_val "senChan" channel

    void put_val(int senChan, int senVal)
            // Set the Csound receive channel "senChan", and read from
            // the sensor data stream "senVal"
    {       // The packing of the data is sssssvvv 0vvvvvvv where s is a
            // senChan bit, v a senVal bit and 0 is zero` bit
      int low = senVal&0x7f;
      int hi = ((senVal>>7)&0x0f) | ((senChan&0x0f)<<4);
      Serial.write(low); Serial.write(hi);
    }

    void put_float(int senChan1, int senChan2, int senChan3, float senVal)
    {
      typedef union {
        float f;
        long i;
      } JOINT;
      JOINT x;
      x.f = senVal;
      put_val(senChan1, (x.i>> 2)& 0x3ff);
      put_val(senChan2, (x.i>>12)& 0x3ff);
      put_val(senChan3, (x.i>>22)& 0x3ff);
    }

    void loop() {

       Serial.write(0xf8);   // Synchronization Byte - (essential!) marks beginning of new serial frame

      put_float(1,2,3,1.23456789);

      delay(10);

    }

    </arduinoSketch>

## See Also

arduinoStart, arduinoStop, arduinoRead,

## Credits

Author: John ffitch
Author: Richard Boulanger
2020

New in version 6.15

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