annotate include/Utilities.h @ 16:670be80463a3 matrix_gpio

- analog matrixIn/matrixOut are now mapped as floats from 0 to 1
- use of an external PRU code can be enabled with -P <filename>
- 16 channels of programmable GPIO can be accessed straight from render() either writing directly to the matrixGpio[] array or using digitalWrite(),
digitalRead(), setDigitalDirection() macros from Utilities.h .

/*
 * Utilities.h
 *
 *  Created on: Oct 27, 2014
 *      Author: parallels
 */

#ifndef UTILITIES_H_
#define UTILITIES_H_

extern int gNumAudioChannels;	// How many audio channels are present
extern int gNumMatrixChannels;	// How many matrix channels are present

// Macros for accessing the matrix values: usable _only_ within render()

// Read an analog input from input pin p at frame f
#define analogRead(p, f) (matrixIn[(f)*gNumMatrixChannels + (p)])
// Write an analog output frame at output pin p, frame f, to value v
#define analogWrite(p, f, v) (matrixOut[(f)*gNumMatrixChannels + (p)] = (uint16_t)(v))

#define setBit(word,bit) ((word)|(1<<(bit)))
#define clearBit(word,bit) ((word)&~(1<<(bit)))
#define getBit(word,bit) (((word)>>(bit))&1)
#define changeBit(word,bit,value) ((clearBit((word),(bit))) | ((value)<<(bit)))
//matrixGpio API:
#define setDigitalDirection(pin,frame,direction) matrixGpio[(frame)]=changeBit(matrixGpio[(frame)],(pin),(direction))
#define digitalWriteAll(frame,value) matrixGpio[(frame)]=0xffff0000*(!(!value));
//sets the bit in the high word, clears the bit in the low word (just in case the direction was not previously set)
#define digitalWrite(pin, frame, value) matrixGpio[(frame)]=( changeBit(matrixGpio[(frame)], (pin+16), (value)) & (0xffffffff-(1<<(pin))) ) //could have been done with two subsequent assignments
#define digitalRead(pin, frame) (   getBit(matrixGpio[(frame)], pin+16) )

float map(float x, float in_min, float in_max, float out_min, float out_max);
float constrain(float x, float min_val, float max_val);

#endif /* UTILITIES_H_ */