m b / Mbed 2 deprecated 4180Lab1

Complete

Dependencies:   mbed

MCP23S17.cpp@0:8f5b2af5e1d5, 2016-01-30 (annotated)

Committer:
mikeb
Date:
Sat Jan 30 02:21:04 2016 +0000
Revision:
0:8f5b2af5e1d5
Combining Functions;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mikeb 0:8f5b2af5e1d5 1 /* MCP23S17 - drive the Microchip MCP23S17 16-bit Port Extender using SPI
mikeb 0:8f5b2af5e1d5 2 * Copyright (c) 2010 Romilly Cocking
mikeb 0:8f5b2af5e1d5 3 * Released under the MIT License: http://mbed.org/license/mit
mikeb 0:8f5b2af5e1d5 4 *
mikeb 0:8f5b2af5e1d5 5 * version 0.4
mikeb 0:8f5b2af5e1d5 6 */
mikeb 0:8f5b2af5e1d5 7
mikeb 0:8f5b2af5e1d5 8 #include "mbed.h"
mikeb 0:8f5b2af5e1d5 9 #include "MCP23S17.h"
mikeb 0:8f5b2af5e1d5 10
mikeb 0:8f5b2af5e1d5 11 MCP23S17::MCP23S17(SPI& spi, PinName ncs, char writeOpcode) : _spi(spi), _ncs(ncs) {
mikeb 0:8f5b2af5e1d5 12 _writeOpcode = writeOpcode;
mikeb 0:8f5b2af5e1d5 13 _readOpcode = _writeOpcode | 1; // low order bit = 1 for read
mikeb 0:8f5b2af5e1d5 14 _init();
mikeb 0:8f5b2af5e1d5 15 }
mikeb 0:8f5b2af5e1d5 16
mikeb 0:8f5b2af5e1d5 17 char MCP23S17::_read(char address) {
mikeb 0:8f5b2af5e1d5 18 _ncs = 0;
mikeb 0:8f5b2af5e1d5 19 _spi.write(_readOpcode);
mikeb 0:8f5b2af5e1d5 20 _spi.write(address);
mikeb 0:8f5b2af5e1d5 21 char result = _spi.write(0);
mikeb 0:8f5b2af5e1d5 22 _ncs = 1;
mikeb 0:8f5b2af5e1d5 23 return result;
mikeb 0:8f5b2af5e1d5 24 }
mikeb 0:8f5b2af5e1d5 25
mikeb 0:8f5b2af5e1d5 26 char MCP23S17::_read(Port port, char address) {
mikeb 0:8f5b2af5e1d5 27 return _read(address + (char) port);
mikeb 0:8f5b2af5e1d5 28 }
mikeb 0:8f5b2af5e1d5 29
mikeb 0:8f5b2af5e1d5 30 void MCP23S17::_write(char address, char data) {
mikeb 0:8f5b2af5e1d5 31 _ncs = 0;
mikeb 0:8f5b2af5e1d5 32 _spi.write(_writeOpcode);
mikeb 0:8f5b2af5e1d5 33 _spi.write(address);
mikeb 0:8f5b2af5e1d5 34 _spi.write(data);
mikeb 0:8f5b2af5e1d5 35 _ncs = 1;
mikeb 0:8f5b2af5e1d5 36 }
mikeb 0:8f5b2af5e1d5 37
mikeb 0:8f5b2af5e1d5 38 void MCP23S17::_write(Port port, char address, char data) {
mikeb 0:8f5b2af5e1d5 39 _write(address + (char) port, data);
mikeb 0:8f5b2af5e1d5 40 }
mikeb 0:8f5b2af5e1d5 41
mikeb 0:8f5b2af5e1d5 42 void MCP23S17::_init() {
mikeb 0:8f5b2af5e1d5 43 _write(IOCON, (IOCON_BYTE_MODE | IOCON_HAEN )); // Hardware addressing on, operations toggle between A and B registers
mikeb 0:8f5b2af5e1d5 44 }
mikeb 0:8f5b2af5e1d5 45
mikeb 0:8f5b2af5e1d5 46 void MCP23S17::direction(Port port, char direction) {
mikeb 0:8f5b2af5e1d5 47 _write(port, IODIRA, direction);
mikeb 0:8f5b2af5e1d5 48 }
mikeb 0:8f5b2af5e1d5 49
mikeb 0:8f5b2af5e1d5 50 void MCP23S17::configurePullUps(Port port, char offOrOn) {
mikeb 0:8f5b2af5e1d5 51 _write(port, GPPUA, offOrOn);
mikeb 0:8f5b2af5e1d5 52 }
mikeb 0:8f5b2af5e1d5 53
mikeb 0:8f5b2af5e1d5 54 void MCP23S17::interruptEnable(Port port, char interruptsEnabledMask) {
mikeb 0:8f5b2af5e1d5 55 _write(port, GPINTENA, interruptsEnabledMask);
mikeb 0:8f5b2af5e1d5 56 }
mikeb 0:8f5b2af5e1d5 57
mikeb 0:8f5b2af5e1d5 58 void MCP23S17::mirrorInterrupts(bool mirror) {
mikeb 0:8f5b2af5e1d5 59 char iocon = _read(IOCON);
mikeb 0:8f5b2af5e1d5 60 if (mirror) {
mikeb 0:8f5b2af5e1d5 61 iocon = iocon | INTERRUPT_MIRROR_BIT;
mikeb 0:8f5b2af5e1d5 62 } else {
mikeb 0:8f5b2af5e1d5 63 iocon = iocon & ~INTERRUPT_MIRROR_BIT;
mikeb 0:8f5b2af5e1d5 64 }
mikeb 0:8f5b2af5e1d5 65 _write(IOCON, iocon);
mikeb 0:8f5b2af5e1d5 66
mikeb 0:8f5b2af5e1d5 67 }
mikeb 0:8f5b2af5e1d5 68
mikeb 0:8f5b2af5e1d5 69 void MCP23S17::interruptPolarity(Polarity polarity) {
mikeb 0:8f5b2af5e1d5 70 char iocon = _read(IOCON);
mikeb 0:8f5b2af5e1d5 71 if (polarity == ACTIVE_LOW) {
mikeb 0:8f5b2af5e1d5 72 iocon = iocon & ~INTERRUPT_POLARITY_BIT;
mikeb 0:8f5b2af5e1d5 73 } else {
mikeb 0:8f5b2af5e1d5 74 iocon = iocon | INTERRUPT_POLARITY_BIT;
mikeb 0:8f5b2af5e1d5 75 }
mikeb 0:8f5b2af5e1d5 76 _write(IOCON, iocon);
mikeb 0:8f5b2af5e1d5 77 }
mikeb 0:8f5b2af5e1d5 78
mikeb 0:8f5b2af5e1d5 79 void MCP23S17::defaultValue(Port port, char valuesToCompare) {
mikeb 0:8f5b2af5e1d5 80 _write(port, DEFVALA, valuesToCompare);
mikeb 0:8f5b2af5e1d5 81 }
mikeb 0:8f5b2af5e1d5 82
mikeb 0:8f5b2af5e1d5 83 void MCP23S17::interruptControl(Port port, char interruptContolBits) {
mikeb 0:8f5b2af5e1d5 84 _write(port, INTCONA, interruptContolBits);
mikeb 0:8f5b2af5e1d5 85 }
mikeb 0:8f5b2af5e1d5 86
mikeb 0:8f5b2af5e1d5 87 void MCP23S17::write(Port port, char byte) {
mikeb 0:8f5b2af5e1d5 88 _write(port, OLATA, byte);
mikeb 0:8f5b2af5e1d5 89 }
mikeb 0:8f5b2af5e1d5 90
mikeb 0:8f5b2af5e1d5 91 char MCP23S17::read(Port port) {
mikeb 0:8f5b2af5e1d5 92 return _read(port, GPIOA);
mikeb 0:8f5b2af5e1d5 93 }
mikeb 0:8f5b2af5e1d5 94