Mark Uckermann / NbAnalogIn

Fast AnalogIn module which asks for a single non blocking reading and causes and interrupt when done.

NbAnalogIn.h@3:d4f99bc10643, 2017-04-04 (annotated)

Committer:
dontknowhow
Date:
Tue Apr 04 22:35:34 2017 +0000
Revision:
3:d4f99bc10643
Parent:
2:336af413f75c 
set interrupt priority;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dontknowhow 0:058d32b78e5d 1 #include "mbed.h"
dontknowhow 2:336af413f75c 2 #include "pinmap.h"
dontknowhow 0:058d32b78e5d 3
dontknowhow 0:058d32b78e5d 4 #ifndef NBANALOGIN_H
dontknowhow 0:058d32b78e5d 5 #define NBANALOGIN_H
dontknowhow 0:058d32b78e5d 6
dontknowhow 1:2666729acca1 7 #define ADC_BUF_SIZE 100
dontknowhow 2:336af413f75c 8 #define ADC_CHANNELS 8
dontknowhow 1:2666729acca1 9
dontknowhow 0:058d32b78e5d 10 /** Library for non blocking ADC operation
dontknowhow 0:058d32b78e5d 11 */
dontknowhow 0:058d32b78e5d 12
dontknowhow 0:058d32b78e5d 13 class NbAnalogIn{
dontknowhow 0:058d32b78e5d 14 public:
dontknowhow 1:2666729acca1 15
dontknowhow 1:2666729acca1 16
dontknowhow 0:058d32b78e5d 17 /**
dontknowhow 0:058d32b78e5d 18 * Create a NbAnalogIn object, sets up ADC
dontknowhow 2:336af413f75c 19 *
dontknowhow 2:336af413f75c 20 * @param pin AnalogIn pin to connect to
dontknowhow 0:058d32b78e5d 21 */
dontknowhow 3:d4f99bc10643 22 NbAnalogIn( PinName pin );
dontknowhow 3:d4f99bc10643 23
dontknowhow 3:d4f99bc10643 24 /**
dontknowhow 3:d4f99bc10643 25 * Set interrupt options
dontknowhow 3:d4f99bc10643 26 *
dontknowhow 3:d4f99bc10643 27 * @param irqfunc - callback function executed at the end of interrupts
dontknowhow 3:d4f99bc10643 28 * @param priority - set interrupt priority level. -1 (default) leaves them unchanged
dontknowhow 3:d4f99bc10643 29 */
dontknowhow 3:d4f99bc10643 30 void setInterrupt(void (*irqfunc)() = 0, int prio = -1);
dontknowhow 0:058d32b78e5d 31
dontknowhow 0:058d32b78e5d 32 /**
dontknowhow 0:058d32b78e5d 33 * does a single blocking read and returns a 12 bit output
dontknowhow 0:058d32b78e5d 34 */
dontknowhow 2:336af413f75c 35 int readBl();
dontknowhow 2:336af413f75c 36
dontknowhow 2:336af413f75c 37 /**
dontknowhow 2:336af413f75c 38 * starts a conversion and sets the interrupt to fire when ADC is finished
dontknowhow 2:336af413f75c 39 * the result will be put into the internal buffer
dontknowhow 2:336af413f75c 40 *
dontknowhow 2:336af413f75c 41 * @param wait - If true, wait for current adc conversion to finish,
dontknowhow 2:336af413f75c 42 * if false (default), stop the current conversion replace it
dontknowhow 2:336af413f75c 43 */
dontknowhow 2:336af413f75c 44 void triggerConv(bool wait = false);
dontknowhow 0:058d32b78e5d 45
dontknowhow 0:058d32b78e5d 46 /**
dontknowhow 2:336af413f75c 47 * checks if the buffer has new results that can be read
dontknowhow 2:336af413f75c 48 */
dontknowhow 2:336af413f75c 49 bool readable();
dontknowhow 2:336af413f75c 50
dontknowhow 2:336af413f75c 51 /**
dontknowhow 2:336af413f75c 52 * returns the next value from the buffer
dontknowhow 0:058d32b78e5d 53 */
dontknowhow 2:336af413f75c 54 int read();
dontknowhow 2:336af413f75c 55
dontknowhow 2:336af413f75c 56 /** An operator shorthand for read()
dontknowhow 2:336af413f75c 57 */
dontknowhow 2:336af413f75c 58 operator int() {
dontknowhow 2:336af413f75c 59 return read();
dontknowhow 2:336af413f75c 60 }
dontknowhow 1:2666729acca1 61
dontknowhow 0:058d32b78e5d 62
dontknowhow 0:058d32b78e5d 63 private:
dontknowhow 0:058d32b78e5d 64
dontknowhow 1:2666729acca1 65 int buffer[ADC_BUF_SIZE];
dontknowhow 1:2666729acca1 66 int write_pos; // next position to be written to
dontknowhow 1:2666729acca1 67 int read_pos; // next position to be read from
dontknowhow 1:2666729acca1 68
dontknowhow 2:336af413f75c 69 static volatile bool converting;
dontknowhow 1:2666729acca1 70
dontknowhow 2:336af413f75c 71 uint8_t channel; // channel of current object (ADC0-7)
dontknowhow 2:336af413f75c 72 void handler( int adc_result );
dontknowhow 2:336af413f75c 73
dontknowhow 2:336af413f75c 74 static void irq();
dontknowhow 2:336af413f75c 75 static NbAnalogIn* handlers[ADC_CHANNELS];
dontknowhow 1:2666729acca1 76
dontknowhow 3:d4f99bc10643 77 // custom interrupt handler which, if set, is called after the internal
dontknowhow 3:d4f99bc10643 78 // interrupt handling
dontknowhow 3:d4f99bc10643 79 void (* cirq)();
dontknowhow 1:2666729acca1 80
dontknowhow 0:058d32b78e5d 81 };
dontknowhow 1:2666729acca1 82
dontknowhow 1:2666729acca1 83
dontknowhow 0:058d32b78e5d 84 #endif