Brian Pearson / Mbed 2 deprecated LPC1768BirefInterface

Biref interface

Dependencies:   mbed

main.cpp@0:b6f6b0483eff, 2016-01-05 (annotated)

Committer:
BPPearson
Date:
Tue Jan 05 16:42:18 2016 +0000
Revision:
0:b6f6b0483eff
Biref interface

Who changed what in which revision?

UserRevisionLine numberNew contents of line
BPPearson 0:b6f6b0483eff 1 #include "mbed.h"
BPPearson 0:b6f6b0483eff 2
BPPearson 0:b6f6b0483eff 3 #define COMMAND 0
BPPearson 0:b6f6b0483eff 4 #define DATA 1
BPPearson 0:b6f6b0483eff 5
BPPearson 0:b6f6b0483eff 6 Serial pc(USBTX, USBRX);
BPPearson 0:b6f6b0483eff 7 Serial birefSensor(p9,p10);
BPPearson 0:b6f6b0483eff 8 DigitalOut led1(LED1);
BPPearson 0:b6f6b0483eff 9 DigitalOut led2(LED2);
BPPearson 0:b6f6b0483eff 10 DigitalOut led3(LED3);
BPPearson 0:b6f6b0483eff 11 DigitalOut led4(LED4);
BPPearson 0:b6f6b0483eff 12 AnalogOut birefOut(p18);
BPPearson 0:b6f6b0483eff 13 BusInOut databus(p21, p22, p23, p24, p25, p26, p27, p28);
BPPearson 0:b6f6b0483eff 14 DigitalOut registerSelect(p30);
BPPearson 0:b6f6b0483eff 15 DigitalOut readWriteClock(p29);
BPPearson 0:b6f6b0483eff 16 Ticker updateLCD;
BPPearson 0:b6f6b0483eff 17
BPPearson 0:b6f6b0483eff 18
BPPearson 0:b6f6b0483eff 19 char rcvBuff[80];
BPPearson 0:b6f6b0483eff 20 int buffIdx = 0;
BPPearson 0:b6f6b0483eff 21 float birefVal, birefStdDev;
BPPearson 0:b6f6b0483eff 22
BPPearson 0:b6f6b0483eff 23 void writeToLCD(bool rs, char data){
BPPearson 0:b6f6b0483eff 24
BPPearson 0:b6f6b0483eff 25 // set register select pin
BPPearson 0:b6f6b0483eff 26 registerSelect = rs;
BPPearson 0:b6f6b0483eff 27
BPPearson 0:b6f6b0483eff 28 // set read/write pin to write
BPPearson 0:b6f6b0483eff 29 //readWrite = 0;
BPPearson 0:b6f6b0483eff 30
BPPearson 0:b6f6b0483eff 31 // set bus as output
BPPearson 0:b6f6b0483eff 32 databus.output();
BPPearson 0:b6f6b0483eff 33
BPPearson 0:b6f6b0483eff 34 // put data onto bus
BPPearson 0:b6f6b0483eff 35 databus = data;
BPPearson 0:b6f6b0483eff 36
BPPearson 0:b6f6b0483eff 37 // pulse read/write clock
BPPearson 0:b6f6b0483eff 38 readWriteClock = 1;
BPPearson 0:b6f6b0483eff 39
BPPearson 0:b6f6b0483eff 40 wait_us(1);
BPPearson 0:b6f6b0483eff 41
BPPearson 0:b6f6b0483eff 42 readWriteClock = 0;
BPPearson 0:b6f6b0483eff 43
BPPearson 0:b6f6b0483eff 44 wait_us(1);
BPPearson 0:b6f6b0483eff 45
BPPearson 0:b6f6b0483eff 46 // clear data bus
BPPearson 0:b6f6b0483eff 47 databus = 0;
BPPearson 0:b6f6b0483eff 48
BPPearson 0:b6f6b0483eff 49 //pc.printf("%02x\n", data);
BPPearson 0:b6f6b0483eff 50
BPPearson 0:b6f6b0483eff 51 }
BPPearson 0:b6f6b0483eff 52
BPPearson 0:b6f6b0483eff 53
BPPearson 0:b6f6b0483eff 54 char readFromLCD(bool rs){
BPPearson 0:b6f6b0483eff 55
BPPearson 0:b6f6b0483eff 56 char data;
BPPearson 0:b6f6b0483eff 57
BPPearson 0:b6f6b0483eff 58 // set register select pin
BPPearson 0:b6f6b0483eff 59 registerSelect = rs;
BPPearson 0:b6f6b0483eff 60
BPPearson 0:b6f6b0483eff 61 // set read/write pin to read
BPPearson 0:b6f6b0483eff 62 //readWrite = 1;
BPPearson 0:b6f6b0483eff 63
BPPearson 0:b6f6b0483eff 64 // set bus as output
BPPearson 0:b6f6b0483eff 65 databus.input();
BPPearson 0:b6f6b0483eff 66
BPPearson 0:b6f6b0483eff 67 // put data onto bus
BPPearson 0:b6f6b0483eff 68 data = databus;
BPPearson 0:b6f6b0483eff 69
BPPearson 0:b6f6b0483eff 70 // pulse read/write clock
BPPearson 0:b6f6b0483eff 71 readWriteClock = 1;
BPPearson 0:b6f6b0483eff 72
BPPearson 0:b6f6b0483eff 73 wait_us(10);
BPPearson 0:b6f6b0483eff 74
BPPearson 0:b6f6b0483eff 75 readWriteClock = 0;
BPPearson 0:b6f6b0483eff 76
BPPearson 0:b6f6b0483eff 77 return data;
BPPearson 0:b6f6b0483eff 78 }
BPPearson 0:b6f6b0483eff 79
BPPearson 0:b6f6b0483eff 80
BPPearson 0:b6f6b0483eff 81 void resetLCD(){
BPPearson 0:b6f6b0483eff 82 }
BPPearson 0:b6f6b0483eff 83
BPPearson 0:b6f6b0483eff 84
BPPearson 0:b6f6b0483eff 85 void initLCD(){
BPPearson 0:b6f6b0483eff 86
BPPearson 0:b6f6b0483eff 87 // wait 15 ms to allow LCD to initialise
BPPearson 0:b6f6b0483eff 88 wait_ms(15);
BPPearson 0:b6f6b0483eff 89
BPPearson 0:b6f6b0483eff 90 // set interface for 8 bit mode
BPPearson 0:b6f6b0483eff 91 writeToLCD(COMMAND, 0x30);
BPPearson 0:b6f6b0483eff 92
BPPearson 0:b6f6b0483eff 93 // give it time
BPPearson 0:b6f6b0483eff 94 wait_ms(5);
BPPearson 0:b6f6b0483eff 95
BPPearson 0:b6f6b0483eff 96 // set interface for 8 bit mode again
BPPearson 0:b6f6b0483eff 97 writeToLCD(COMMAND, 0x30);
BPPearson 0:b6f6b0483eff 98
BPPearson 0:b6f6b0483eff 99 // give it time
BPPearson 0:b6f6b0483eff 100 wait_us(100);
BPPearson 0:b6f6b0483eff 101
BPPearson 0:b6f6b0483eff 102 // set interface for 8 bit mode again, last one before we can configure the display
BPPearson 0:b6f6b0483eff 103 writeToLCD(COMMAND, 0x30);
BPPearson 0:b6f6b0483eff 104
BPPearson 0:b6f6b0483eff 105 // give it time
BPPearson 0:b6f6b0483eff 106 wait_us(500);
BPPearson 0:b6f6b0483eff 107
BPPearson 0:b6f6b0483eff 108 // set interface for 8 bit mode, 2 display lines and 5 x 8 character font
BPPearson 0:b6f6b0483eff 109 writeToLCD(COMMAND, 0x38);
BPPearson 0:b6f6b0483eff 110
BPPearson 0:b6f6b0483eff 111 // give it time
BPPearson 0:b6f6b0483eff 112 wait_us(100);
BPPearson 0:b6f6b0483eff 113
BPPearson 0:b6f6b0483eff 114 // display off
BPPearson 0:b6f6b0483eff 115 writeToLCD(COMMAND, 0x08);
BPPearson 0:b6f6b0483eff 116
BPPearson 0:b6f6b0483eff 117 // give it time
BPPearson 0:b6f6b0483eff 118 wait_us(100);
BPPearson 0:b6f6b0483eff 119
BPPearson 0:b6f6b0483eff 120 // clear the screen
BPPearson 0:b6f6b0483eff 121 writeToLCD(COMMAND, 0x01);
BPPearson 0:b6f6b0483eff 122
BPPearson 0:b6f6b0483eff 123 // give it time to finish
BPPearson 0:b6f6b0483eff 124 wait_ms(2);
BPPearson 0:b6f6b0483eff 125
BPPearson 0:b6f6b0483eff 126 // set entry mode to increment cursor position cursor on write
BPPearson 0:b6f6b0483eff 127 writeToLCD(COMMAND, 0x03);
BPPearson 0:b6f6b0483eff 128
BPPearson 0:b6f6b0483eff 129 // give it time to finish
BPPearson 0:b6f6b0483eff 130 wait_us(100);
BPPearson 0:b6f6b0483eff 131
BPPearson 0:b6f6b0483eff 132 // position cursor at home
BPPearson 0:b6f6b0483eff 133 writeToLCD(COMMAND, 0x02);
BPPearson 0:b6f6b0483eff 134
BPPearson 0:b6f6b0483eff 135 // give it time to finish
BPPearson 0:b6f6b0483eff 136 wait_ms(2);
BPPearson 0:b6f6b0483eff 137
BPPearson 0:b6f6b0483eff 138 // display on
BPPearson 0:b6f6b0483eff 139 writeToLCD(COMMAND, 0x0C);
BPPearson 0:b6f6b0483eff 140 }
BPPearson 0:b6f6b0483eff 141
BPPearson 0:b6f6b0483eff 142
BPPearson 0:b6f6b0483eff 143
BPPearson 0:b6f6b0483eff 144
BPPearson 0:b6f6b0483eff 145 void positionCursor(uint8_t x, uint8_t y){
BPPearson 0:b6f6b0483eff 146
BPPearson 0:b6f6b0483eff 147 if (x > 7) x = 0;
BPPearson 0:b6f6b0483eff 148
BPPearson 0:b6f6b0483eff 149 if (y == 1)
BPPearson 0:b6f6b0483eff 150 writeToLCD(COMMAND, 0x80 + 0x40 + x);
BPPearson 0:b6f6b0483eff 151 else
BPPearson 0:b6f6b0483eff 152 writeToLCD(COMMAND, 0x80 + 0x00 + x);
BPPearson 0:b6f6b0483eff 153
BPPearson 0:b6f6b0483eff 154 wait_us(50);
BPPearson 0:b6f6b0483eff 155 }
BPPearson 0:b6f6b0483eff 156
BPPearson 0:b6f6b0483eff 157
BPPearson 0:b6f6b0483eff 158 void displayString(int x, int y, char *str){
BPPearson 0:b6f6b0483eff 159
BPPearson 0:b6f6b0483eff 160 // position cursor
BPPearson 0:b6f6b0483eff 161 positionCursor(x, y);
BPPearson 0:b6f6b0483eff 162
BPPearson 0:b6f6b0483eff 163 // write string to screen
BPPearson 0:b6f6b0483eff 164 for (int i=0; i<strlen(str); i++){
BPPearson 0:b6f6b0483eff 165 writeToLCD(DATA, str[i]);
BPPearson 0:b6f6b0483eff 166
BPPearson 0:b6f6b0483eff 167 wait_us(50);
BPPearson 0:b6f6b0483eff 168 }
BPPearson 0:b6f6b0483eff 169 }
BPPearson 0:b6f6b0483eff 170
BPPearson 0:b6f6b0483eff 171
BPPearson 0:b6f6b0483eff 172
BPPearson 0:b6f6b0483eff 173 void updateDisplay(){
BPPearson 0:b6f6b0483eff 174 char str[20];
BPPearson 0:b6f6b0483eff 175
BPPearson 0:b6f6b0483eff 176 sprintf( str, "b %5.3f", birefVal);
BPPearson 0:b6f6b0483eff 177
BPPearson 0:b6f6b0483eff 178 displayString(0, 0, str);
BPPearson 0:b6f6b0483eff 179
BPPearson 0:b6f6b0483eff 180 if (birefStdDev <= 0.0)
BPPearson 0:b6f6b0483eff 181 birefStdDev = 0.0001;
BPPearson 0:b6f6b0483eff 182
BPPearson 0:b6f6b0483eff 183 sprintf( str, "s %5.3f", birefStdDev);
BPPearson 0:b6f6b0483eff 184
BPPearson 0:b6f6b0483eff 185 displayString(0, 1, str);
BPPearson 0:b6f6b0483eff 186 }
BPPearson 0:b6f6b0483eff 187
BPPearson 0:b6f6b0483eff 188
BPPearson 0:b6f6b0483eff 189 void rcvCharISR()
BPPearson 0:b6f6b0483eff 190 {
BPPearson 0:b6f6b0483eff 191 float tempf;
BPPearson 0:b6f6b0483eff 192 char chr = birefSensor.getc();
BPPearson 0:b6f6b0483eff 193
BPPearson 0:b6f6b0483eff 194 //led1 = !led1;
BPPearson 0:b6f6b0483eff 195
BPPearson 0:b6f6b0483eff 196 //pc.printf("%c (%02x)\n", chr, chr);
BPPearson 0:b6f6b0483eff 197
BPPearson 0:b6f6b0483eff 198 rcvBuff[buffIdx++] = chr;
BPPearson 0:b6f6b0483eff 199
BPPearson 0:b6f6b0483eff 200 if (buffIdx >= 80)
BPPearson 0:b6f6b0483eff 201 {
BPPearson 0:b6f6b0483eff 202 buffIdx = 0;
BPPearson 0:b6f6b0483eff 203 }
BPPearson 0:b6f6b0483eff 204
BPPearson 0:b6f6b0483eff 205 if (chr == '\n')
BPPearson 0:b6f6b0483eff 206 {
BPPearson 0:b6f6b0483eff 207 rcvBuff[buffIdx] = '\0';
BPPearson 0:b6f6b0483eff 208
BPPearson 0:b6f6b0483eff 209 switch (rcvBuff[0]){
BPPearson 0:b6f6b0483eff 210 case 'm':
BPPearson 0:b6f6b0483eff 211 sscanf(rcvBuff, "m%f %f\n", &birefVal, &birefStdDev);
BPPearson 0:b6f6b0483eff 212 birefOut = birefVal;
BPPearson 0:b6f6b0483eff 213 break;
BPPearson 0:b6f6b0483eff 214 case 'd':
BPPearson 0:b6f6b0483eff 215 sscanf(rcvBuff, "d%f %f %f %f %f %f \n", &tempf, &tempf, &tempf, &tempf, &birefVal, &birefStdDev);
BPPearson 0:b6f6b0483eff 216 birefOut = birefVal;
BPPearson 0:b6f6b0483eff 217 break;
BPPearson 0:b6f6b0483eff 218 default: ;
BPPearson 0:b6f6b0483eff 219 }
BPPearson 0:b6f6b0483eff 220 buffIdx = 0;
BPPearson 0:b6f6b0483eff 221 }
BPPearson 0:b6f6b0483eff 222 }
BPPearson 0:b6f6b0483eff 223
BPPearson 0:b6f6b0483eff 224
BPPearson 0:b6f6b0483eff 225
BPPearson 0:b6f6b0483eff 226 int main() {
BPPearson 0:b6f6b0483eff 227
BPPearson 0:b6f6b0483eff 228 initLCD();
BPPearson 0:b6f6b0483eff 229
BPPearson 0:b6f6b0483eff 230 birefSensor.baud(115200);
BPPearson 0:b6f6b0483eff 231
BPPearson 0:b6f6b0483eff 232 pc.printf("Hello\n");
BPPearson 0:b6f6b0483eff 233
BPPearson 0:b6f6b0483eff 234 updateLCD.attach(&updateDisplay, 0.5);
BPPearson 0:b6f6b0483eff 235
BPPearson 0:b6f6b0483eff 236 birefSensor.attach(&rcvCharISR);
BPPearson 0:b6f6b0483eff 237
BPPearson 0:b6f6b0483eff 238 while(1) {
BPPearson 0:b6f6b0483eff 239
BPPearson 0:b6f6b0483eff 240 wait(0.02);
BPPearson 0:b6f6b0483eff 241 //wait(1.0);
BPPearson 0:b6f6b0483eff 242 }
BPPearson 0:b6f6b0483eff 243 }