E3 Designers / ButtonCtrl

Release 1.01

mcp23s08.cpp@0:b6d729ae4f27, 2019-07-25 (annotated)

Committer:
foxbrianr
Date:
Thu Jul 25 00:43:08 2019 +0000
Revision:
0:b6d729ae4f27
Child:
2:1d5204d29bc5
Baseline for testing

Who changed what in which revision?

UserRevisionLine numberNew contents of line
foxbrianr 0:b6d729ae4f27 1 #include "mbed.h"
foxbrianr 0:b6d729ae4f27 2 #include "mcp23s08.h"
foxbrianr 0:b6d729ae4f27 3
foxbrianr 0:b6d729ae4f27 4 #define INPUT 0
foxbrianr 0:b6d729ae4f27 5 #define OUTPUT 1
foxbrianr 0:b6d729ae4f27 6
foxbrianr 0:b6d729ae4f27 7 #define LOW 0
foxbrianr 0:b6d729ae4f27 8 #define HIGH 1
foxbrianr 0:b6d729ae4f27 9
foxbrianr 0:b6d729ae4f27 10 mcp23s08::mcp23s08(PinName mosi, PinName miso, PinName clk, PinName cs_pin,const uint8_t haenAdrs) : SPI(mosi, miso, clk), cs(cs_pin) {
foxbrianr 0:b6d729ae4f27 11 format(8, 3);
foxbrianr 0:b6d729ae4f27 12 frequency(2000000);
foxbrianr 0:b6d729ae4f27 13
foxbrianr 0:b6d729ae4f27 14 postSetup(haenAdrs);
foxbrianr 0:b6d729ae4f27 15
foxbrianr 0:b6d729ae4f27 16 }
foxbrianr 0:b6d729ae4f27 17
foxbrianr 0:b6d729ae4f27 18
foxbrianr 0:b6d729ae4f27 19 void mcp23s08::postSetup(const uint8_t haenAdrs){
foxbrianr 0:b6d729ae4f27 20 if (haenAdrs >= 0x20 && haenAdrs <= 0x23){//HAEN works between 0x20...0x23
foxbrianr 0:b6d729ae4f27 21 _adrs = haenAdrs;
foxbrianr 0:b6d729ae4f27 22 _useHaen = 1;
foxbrianr 0:b6d729ae4f27 23 } else {
foxbrianr 0:b6d729ae4f27 24 _adrs = 0;
foxbrianr 0:b6d729ae4f27 25 _useHaen = 0;
foxbrianr 0:b6d729ae4f27 26 }
foxbrianr 0:b6d729ae4f27 27 _readCmd = (_adrs << 1) | 1;
foxbrianr 0:b6d729ae4f27 28 _writeCmd = _adrs << 1;
foxbrianr 0:b6d729ae4f27 29 //setup register values for this chip
foxbrianr 0:b6d729ae4f27 30 IOCON = 0x05;
foxbrianr 0:b6d729ae4f27 31 IODIR = 0x00;
foxbrianr 0:b6d729ae4f27 32 GPPU = 0x06;
foxbrianr 0:b6d729ae4f27 33 GPIO = 0x09;
foxbrianr 0:b6d729ae4f27 34 GPINTEN = 0x02;
foxbrianr 0:b6d729ae4f27 35 IPOL = 0x01;
foxbrianr 0:b6d729ae4f27 36 DEFVAL = 0x03;
foxbrianr 0:b6d729ae4f27 37 INTF = 0x07;
foxbrianr 0:b6d729ae4f27 38 INTCAP = 0x08;
foxbrianr 0:b6d729ae4f27 39 OLAT = 0x0A;
foxbrianr 0:b6d729ae4f27 40 INTCON = 0x04;
foxbrianr 0:b6d729ae4f27 41 }
foxbrianr 0:b6d729ae4f27 42
foxbrianr 0:b6d729ae4f27 43 void mcp23s08::begin(bool protocolInitOverride) {
foxbrianr 0:b6d729ae4f27 44
foxbrianr 0:b6d729ae4f27 45 cs=1;
foxbrianr 0:b6d729ae4f27 46 wait(0.1);
foxbrianr 0:b6d729ae4f27 47 _useHaen == 1 ? writeByte(IOCON,0b00101000) : writeByte(IOCON,0b00100000);
foxbrianr 0:b6d729ae4f27 48 /*
foxbrianr 0:b6d729ae4f27 49 if (_useHaen){
foxbrianr 0:b6d729ae4f27 50 writeByte(IOCON,0b00101000);//read datasheet for details!
foxbrianr 0:b6d729ae4f27 51 } else {
foxbrianr 0:b6d729ae4f27 52 writeByte(IOCON,0b00100000);
foxbrianr 0:b6d729ae4f27 53 }
foxbrianr 0:b6d729ae4f27 54 */
foxbrianr 0:b6d729ae4f27 55 _gpioDirection = 0xFF;//all in
foxbrianr 0:b6d729ae4f27 56 _gpioState = 0x00;//all low
foxbrianr 0:b6d729ae4f27 57 }
foxbrianr 0:b6d729ae4f27 58
foxbrianr 0:b6d729ae4f27 59
foxbrianr 0:b6d729ae4f27 60 uint8_t mcp23s08::readAddress(uint8_t addr){
foxbrianr 0:b6d729ae4f27 61 uint8_t low_byte = 0x00;
foxbrianr 0:b6d729ae4f27 62 startSend(1);
foxbrianr 0:b6d729ae4f27 63 SPI::write(addr);
foxbrianr 0:b6d729ae4f27 64 low_byte = (uint8_t)SPI::write(0x00);
foxbrianr 0:b6d729ae4f27 65 endSend();
foxbrianr 0:b6d729ae4f27 66 return low_byte;
foxbrianr 0:b6d729ae4f27 67 }
foxbrianr 0:b6d729ae4f27 68
foxbrianr 0:b6d729ae4f27 69
foxbrianr 0:b6d729ae4f27 70
foxbrianr 0:b6d729ae4f27 71 void mcp23s08::gpioPinMode(uint8_t mode){
foxbrianr 0:b6d729ae4f27 72 if (mode == INPUT){
foxbrianr 0:b6d729ae4f27 73 _gpioDirection = 0xFF;
foxbrianr 0:b6d729ae4f27 74 } else if (mode == OUTPUT){
foxbrianr 0:b6d729ae4f27 75 _gpioDirection = 0x00;
foxbrianr 0:b6d729ae4f27 76 _gpioState = 0x00;
foxbrianr 0:b6d729ae4f27 77 } else {
foxbrianr 0:b6d729ae4f27 78 _gpioDirection = mode;
foxbrianr 0:b6d729ae4f27 79 }
foxbrianr 0:b6d729ae4f27 80 writeByte(IODIR,_gpioDirection);
foxbrianr 0:b6d729ae4f27 81 }
foxbrianr 0:b6d729ae4f27 82
foxbrianr 0:b6d729ae4f27 83 void mcp23s08::gpioPinMode(uint8_t pin, bool mode){
foxbrianr 0:b6d729ae4f27 84 if (pin < 8){//0...7
foxbrianr 0:b6d729ae4f27 85 mode == INPUT ? _gpioDirection |= (1 << pin) :_gpioDirection &= ~(1 << pin);
foxbrianr 0:b6d729ae4f27 86 writeByte(IODIR,_gpioDirection);
foxbrianr 0:b6d729ae4f27 87 }
foxbrianr 0:b6d729ae4f27 88 }
foxbrianr 0:b6d729ae4f27 89
foxbrianr 0:b6d729ae4f27 90 void mcp23s08::gpioPort(uint8_t value){
foxbrianr 0:b6d729ae4f27 91 if (value == HIGH){
foxbrianr 0:b6d729ae4f27 92 _gpioState = 0xFF;
foxbrianr 0:b6d729ae4f27 93 } else if (value == LOW){
foxbrianr 0:b6d729ae4f27 94 _gpioState = 0x00;
foxbrianr 0:b6d729ae4f27 95 } else {
foxbrianr 0:b6d729ae4f27 96 _gpioState = value;
foxbrianr 0:b6d729ae4f27 97 }
foxbrianr 0:b6d729ae4f27 98 writeByte(GPIO,_gpioState);
foxbrianr 0:b6d729ae4f27 99 }
foxbrianr 0:b6d729ae4f27 100
foxbrianr 0:b6d729ae4f27 101
foxbrianr 0:b6d729ae4f27 102 uint8_t mcp23s08::readGpioPort(){
foxbrianr 0:b6d729ae4f27 103 return readAddress(GPIO);
foxbrianr 0:b6d729ae4f27 104 }
foxbrianr 0:b6d729ae4f27 105
foxbrianr 0:b6d729ae4f27 106 uint8_t mcp23s08::readGpioPortFast(){
foxbrianr 0:b6d729ae4f27 107 return _gpioState;
foxbrianr 0:b6d729ae4f27 108 }
foxbrianr 0:b6d729ae4f27 109
foxbrianr 0:b6d729ae4f27 110 int mcp23s08::gpioDigitalReadFast(uint8_t pin){
foxbrianr 0:b6d729ae4f27 111 if (pin < 8){//0...7
foxbrianr 0:b6d729ae4f27 112 int temp = _gpioState & (1 << pin);
foxbrianr 0:b6d729ae4f27 113 return temp;
foxbrianr 0:b6d729ae4f27 114 } else {
foxbrianr 0:b6d729ae4f27 115 return 0;
foxbrianr 0:b6d729ae4f27 116 }
foxbrianr 0:b6d729ae4f27 117 }
foxbrianr 0:b6d729ae4f27 118
foxbrianr 0:b6d729ae4f27 119 void mcp23s08::portPullup(uint8_t data) {
foxbrianr 0:b6d729ae4f27 120 if (data == HIGH){
foxbrianr 0:b6d729ae4f27 121 _gpioState = 0xFF;
foxbrianr 0:b6d729ae4f27 122 } else if (data == LOW){
foxbrianr 0:b6d729ae4f27 123 _gpioState = 0x00;
foxbrianr 0:b6d729ae4f27 124 } else {
foxbrianr 0:b6d729ae4f27 125 _gpioState = data;
foxbrianr 0:b6d729ae4f27 126 }
foxbrianr 0:b6d729ae4f27 127 writeByte(GPPU, _gpioState);
foxbrianr 0:b6d729ae4f27 128 }
foxbrianr 0:b6d729ae4f27 129
foxbrianr 0:b6d729ae4f27 130
foxbrianr 0:b6d729ae4f27 131
foxbrianr 0:b6d729ae4f27 132
foxbrianr 0:b6d729ae4f27 133 void mcp23s08::gpioDigitalWrite(uint8_t pin, bool value){
foxbrianr 0:b6d729ae4f27 134 if (pin < 8){//0...7
foxbrianr 0:b6d729ae4f27 135 value == HIGH ? _gpioState |= (1 << pin) : _gpioState &= ~(1 << pin);
foxbrianr 0:b6d729ae4f27 136 writeByte(GPIO,_gpioState);
foxbrianr 0:b6d729ae4f27 137 }
foxbrianr 0:b6d729ae4f27 138 }
foxbrianr 0:b6d729ae4f27 139
foxbrianr 0:b6d729ae4f27 140 void mcp23s08::gpioDigitalWriteFast(uint8_t pin, bool value){
foxbrianr 0:b6d729ae4f27 141 if (pin < 8){//0...8
foxbrianr 0:b6d729ae4f27 142 value == HIGH ? _gpioState |= (1 << pin) : _gpioState &= ~(1 << pin);
foxbrianr 0:b6d729ae4f27 143 }
foxbrianr 0:b6d729ae4f27 144 }
foxbrianr 0:b6d729ae4f27 145
foxbrianr 0:b6d729ae4f27 146 void mcp23s08::gpioPortUpdate(){
foxbrianr 0:b6d729ae4f27 147 writeByte(GPIO,_gpioState);
foxbrianr 0:b6d729ae4f27 148 }
foxbrianr 0:b6d729ae4f27 149
foxbrianr 0:b6d729ae4f27 150 int mcp23s08::gpioDigitalRead(uint8_t pin){
foxbrianr 0:b6d729ae4f27 151 if (pin < 8) return (int)(readAddress(GPIO) & 1 << pin);
foxbrianr 0:b6d729ae4f27 152 return 0;
foxbrianr 0:b6d729ae4f27 153 }
foxbrianr 0:b6d729ae4f27 154
foxbrianr 0:b6d729ae4f27 155 uint8_t mcp23s08::gpioRegisterReadByte(uint8_t reg){
foxbrianr 0:b6d729ae4f27 156 uint8_t data = 0;
foxbrianr 0:b6d729ae4f27 157 startSend(1);
foxbrianr 0:b6d729ae4f27 158 SPI::write(reg);
foxbrianr 0:b6d729ae4f27 159 data = (uint8_t)SPI::write(0x00);
foxbrianr 0:b6d729ae4f27 160 endSend();
foxbrianr 0:b6d729ae4f27 161 return data;
foxbrianr 0:b6d729ae4f27 162 }
foxbrianr 0:b6d729ae4f27 163
foxbrianr 0:b6d729ae4f27 164
foxbrianr 0:b6d729ae4f27 165 void mcp23s08::gpioRegisterWriteByte(uint8_t reg,uint8_t data){
foxbrianr 0:b6d729ae4f27 166 writeByte(reg,(uint8_t)data);
foxbrianr 0:b6d729ae4f27 167 }
foxbrianr 0:b6d729ae4f27 168
foxbrianr 0:b6d729ae4f27 169 /* ------------------------------ Low Level ----------------*/
foxbrianr 0:b6d729ae4f27 170 void mcp23s08::startSend(bool mode){
foxbrianr 0:b6d729ae4f27 171 cs=0;
foxbrianr 0:b6d729ae4f27 172 mode == 1 ? SPI::write(_readCmd) : SPI::write(_writeCmd);
foxbrianr 0:b6d729ae4f27 173 }
foxbrianr 0:b6d729ae4f27 174
foxbrianr 0:b6d729ae4f27 175 void mcp23s08::endSend(){
foxbrianr 0:b6d729ae4f27 176 cs=1;
foxbrianr 0:b6d729ae4f27 177 }
foxbrianr 0:b6d729ae4f27 178
foxbrianr 0:b6d729ae4f27 179
foxbrianr 0:b6d729ae4f27 180 void mcp23s08::writeByte(uint8_t addr, uint8_t data){
foxbrianr 0:b6d729ae4f27 181 startSend(0);
foxbrianr 0:b6d729ae4f27 182 SPI::write(addr);
foxbrianr 0:b6d729ae4f27 183 SPI::write(data);
foxbrianr 0:b6d729ae4f27 184 endSend();
foxbrianr 0:b6d729ae4f27 185 }