malcolm lear / Mbed 2 deprecated LabmbedV30

Labmbed device drivers

Dependencies:   TextLCD mbed

main.cpp@3:8eee79f59b30, 2017-01-12 (annotated)

Committer:
malcolmlear
Date:
Thu Jan 12 15:33:58 2017 +0000
Revision:
3:8eee79f59b30
Parent:
2:caa0e6b2b436
Child:
4:e2310d494d19
LCD, LED's, Temperature, Switches, Keypad all work without obvious issues.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
malcolmlear 0:416329806e55 1 // Demo Program for Labmbed Board
malcolmlear 0:416329806e55 2
malcolmlear 0:416329806e55 3 #include "mbed.h"
malcolmlear 0:416329806e55 4 #include "TextLCD.h"
malcolmlear 0:416329806e55 5
malcolmlear 2:caa0e6b2b436 6 TextLCD lcd(p15, p16, p17, p18, p19, p20); // LCD: RS, E, D4-D7
malcolmlear 2:caa0e6b2b436 7 SPI spi(p5, p6, p7); // SPI: MOSI, MISO, SCLK (MISO not used with LCD)
malcolmlear 2:caa0e6b2b436 8 DigitalOut lat(p8); // data latch for LED driver TLC59281
malcolmlear 3:8eee79f59b30 9 DigitalOut sel0(p26); // input select bits:
malcolmlear 3:8eee79f59b30 10 DigitalOut sel1(p25); // "
malcolmlear 3:8eee79f59b30 11 DigitalOut sel2(p24); // "
malcolmlear 3:8eee79f59b30 12 DigitalIn in0(p14); // input from switches, keypad etc
malcolmlear 3:8eee79f59b30 13 DigitalIn in1(p13); // "
malcolmlear 3:8eee79f59b30 14 DigitalIn in2(p12); // "
malcolmlear 3:8eee79f59b30 15 DigitalIn in3(p11); // "
malcolmlear 2:caa0e6b2b436 16 I2C i2c(p9, p10); // I2C: SDA, SCL
malcolmlear 0:416329806e55 17
malcolmlear 2:caa0e6b2b436 18 int led_bits = 0; // global LED status used for readback
malcolmlear 2:caa0e6b2b436 19 const int tmp102addr = 0x92; // TMP102 temperature I2C address
malcolmlear 0:416329806e55 20
malcolmlear 0:416329806e55 21
malcolmlear 0:416329806e55 22 void initleds() {
malcolmlear 2:caa0e6b2b436 23 lat = 0; // latch must start low
malcolmlear 2:caa0e6b2b436 24 spi.format(16,0); // SPI 16 bit data, low state, high going clock
malcolmlear 2:caa0e6b2b436 25 spi.frequency(1000000); // 1MHz clock rate
malcolmlear 0:416329806e55 26 }
malcolmlear 0:416329806e55 27
malcolmlear 0:416329806e55 28 void setleds(int ledall) {
malcolmlear 2:caa0e6b2b436 29 led_bits = ledall; // update global LED status
malcolmlear 0:416329806e55 30 spi.write((led_bits & 0x03ff) | ((led_bits & 0xa800) >> 1) | ((led_bits & 0x5400) << 1));
malcolmlear 2:caa0e6b2b436 31 lat = 1; // latch pulse start
malcolmlear 2:caa0e6b2b436 32 lat = 0; // latch pulse end
malcolmlear 0:416329806e55 33 }
malcolmlear 0:416329806e55 34
malcolmlear 0:416329806e55 35 void setled(int ledno, int ledstate) {
malcolmlear 2:caa0e6b2b436 36 ledno = ((ledno - 1) & 0x0007) + 1; // limit led number
malcolmlear 2:caa0e6b2b436 37 ledno = (8 - ledno) * 2; // offset of led state in 'led_bits'
malcolmlear 2:caa0e6b2b436 38 ledstate = ledstate & 0x0003; // limit led state
malcolmlear 0:416329806e55 39 ledstate = ledstate << ledno;
malcolmlear 2:caa0e6b2b436 40 int statemask = ((0x0003 << ledno) ^ 0xffff); // mask used to clear led state
malcolmlear 1:04e1ee8faa04 41 led_bits = ((led_bits & statemask) | ledstate); // clear and set led state
malcolmlear 0:416329806e55 42 setleds(led_bits);
malcolmlear 0:416329806e55 43 }
malcolmlear 0:416329806e55 44
malcolmlear 0:416329806e55 45 int readled(int ledno) {
malcolmlear 2:caa0e6b2b436 46 ledno = ((ledno - 1) & 0x0007) + 1; // limit led number
malcolmlear 2:caa0e6b2b436 47 ledno = (8 - ledno) * 2; // offset of led state in 'led_bits'
malcolmlear 0:416329806e55 48 int ledstate = led_bits;
malcolmlear 2:caa0e6b2b436 49 ledstate = ledstate >> ledno; // shift selected led state into ls 2 bits
malcolmlear 2:caa0e6b2b436 50 return (ledstate & 0x0003); // mask out and return led state
malcolmlear 0:416329806e55 51 }
malcolmlear 0:416329806e55 52
malcolmlear 0:416329806e55 53 int readleds() {
malcolmlear 2:caa0e6b2b436 54 return led_bits; // return LED status
malcolmlear 0:416329806e55 55 }
malcolmlear 0:416329806e55 56
malcolmlear 3:8eee79f59b30 57 void selinput(int input) {
malcolmlear 3:8eee79f59b30 58 sel0 = input & 0x0001; // set sel[0:2] pins
malcolmlear 3:8eee79f59b30 59 sel1 = (input >> 1) & 0x0001; //
malcolmlear 3:8eee79f59b30 60 sel2 = (input >> 2) & 0x0001; //
malcolmlear 3:8eee79f59b30 61 }
malcolmlear 0:416329806e55 62
malcolmlear 3:8eee79f59b30 63 int readswitches() {
malcolmlear 3:8eee79f59b30 64 selinput(5); // select least significant 4 switches in[3:0]
malcolmlear 3:8eee79f59b30 65 int switches = in0 + (in1 << 1) + (in2 << 2) + (in3 << 3);
malcolmlear 3:8eee79f59b30 66 selinput(4); // select most significant 4 switches in[3:0]
malcolmlear 3:8eee79f59b30 67 return (switches + (in0 << 4)+ (in1 << 5) + (in2 << 6) + (in3 << 7));
malcolmlear 3:8eee79f59b30 68 }
malcolmlear 0:416329806e55 69
malcolmlear 3:8eee79f59b30 70 int readswitch(int switchno) {
malcolmlear 3:8eee79f59b30 71 switchno = ((switchno - 1) & 0x0007) + 1; // limit switch number
malcolmlear 3:8eee79f59b30 72 switchno = 8 - switchno; // offset of switch state in readswitches()
malcolmlear 3:8eee79f59b30 73 int switchstate = readswitches();
malcolmlear 3:8eee79f59b30 74 switchstate = switchstate >> switchno; // shift selected switch state into ls bit
malcolmlear 3:8eee79f59b30 75 return (switchstate & 0x0001); // mask out and return switch state
malcolmlear 3:8eee79f59b30 76 }
malcolmlear 0:416329806e55 77
malcolmlear 3:8eee79f59b30 78 int readkeys() {
malcolmlear 3:8eee79f59b30 79 selinput(0); // select keypad top row
malcolmlear 3:8eee79f59b30 80 int keys = (in0 << 15) + (in1 << 14) + (in2 << 13) + (in3 << 12);
malcolmlear 3:8eee79f59b30 81 selinput(1); // select keypad second row
malcolmlear 3:8eee79f59b30 82 keys = keys + (in0 << 3) + (in1 << 6) + (in2 << 9) + (in3 << 11);
malcolmlear 3:8eee79f59b30 83 selinput(2); // select keypad third row
malcolmlear 3:8eee79f59b30 84 keys = keys + (in0 << 2) + (in1 << 5) + (in2 << 8) + in3;
malcolmlear 3:8eee79f59b30 85 selinput(3); // select keypad forth row
malcolmlear 3:8eee79f59b30 86 keys = keys + (in0 << 1) + (in1 << 4) + (in2 << 7) + (in3 << 10);
malcolmlear 3:8eee79f59b30 87 return (keys ^ 0xffff); // return inverted (key press active high)
malcolmlear 3:8eee79f59b30 88 }
malcolmlear 0:416329806e55 89
malcolmlear 3:8eee79f59b30 90 int readkey(int keyno) {
malcolmlear 3:8eee79f59b30 91 keyno = keyno & 0x000f; // limit key number 0 to 15 (0 to F)
malcolmlear 3:8eee79f59b30 92 int keystate = readkeys();
malcolmlear 3:8eee79f59b30 93 keystate = keystate >> keyno; // shift selected key state into ls bit
malcolmlear 3:8eee79f59b30 94 return (keystate & 0x0001); // mask out and return key state
malcolmlear 3:8eee79f59b30 95 }
malcolmlear 0:416329806e55 96
malcolmlear 0:416329806e55 97 float readtemp() {
malcolmlear 2:caa0e6b2b436 98 char cmd[3];
malcolmlear 2:caa0e6b2b436 99 cmd[0] = 0x01; // pointer register value
malcolmlear 2:caa0e6b2b436 100 cmd[1] = 0x60; // byte 1 of the configuration register
malcolmlear 2:caa0e6b2b436 101 cmd[2] = 0xa0; // byte 2 of the configuration register
malcolmlear 2:caa0e6b2b436 102 i2c.write(tmp102addr, cmd, 3); // select configuration register and write 0x60a0 to it
malcolmlear 2:caa0e6b2b436 103 wait(0.5); // wait for conversion
malcolmlear 2:caa0e6b2b436 104 cmd[0] = 0x00; // pointer register value
malcolmlear 2:caa0e6b2b436 105 i2c.write(tmp102addr, cmd, 1); // select temperature register
malcolmlear 2:caa0e6b2b436 106 i2c.read(tmp102addr, cmd, 2); // read 16-bit temperature register
malcolmlear 2:caa0e6b2b436 107 return (float((cmd[0]<<8)|cmd[1]) / 256.0); // divide by 256 and return temperature
malcolmlear 0:416329806e55 108 }
malcolmlear 0:416329806e55 109
malcolmlear 0:416329806e55 110 int main() {
malcolmlear 0:416329806e55 111
malcolmlear 0:416329806e55 112 initleds();
malcolmlear 0:416329806e55 113
malcolmlear 0:416329806e55 114 while(1) {
malcolmlear 1:04e1ee8faa04 115 int a,b;
malcolmlear 1:04e1ee8faa04 116 for (b = 0; b < 4; b++ ) {
malcolmlear 2:caa0e6b2b436 117 for (a = 1; a < 9; a++ ) {
malcolmlear 1:04e1ee8faa04 118 setled (a,b);
malcolmlear 3:8eee79f59b30 119 wait(.1);
malcolmlear 1:04e1ee8faa04 120 }
malcolmlear 1:04e1ee8faa04 121 }
malcolmlear 3:8eee79f59b30 122 for (a= 1; a < 9; a++ ) {
malcolmlear 3:8eee79f59b30 123 setled (a,(readswitch(a) * 3));
malcolmlear 3:8eee79f59b30 124 }
malcolmlear 3:8eee79f59b30 125 float temp = readtemp();
malcolmlear 3:8eee79f59b30 126 lcd.printf(" ");
malcolmlear 3:8eee79f59b30 127 lcd.printf("Temp = %f\n", temp);
malcolmlear 3:8eee79f59b30 128 wait(1);
malcolmlear 3:8eee79f59b30 129 int switches = readswitches();
malcolmlear 3:8eee79f59b30 130 lcd.printf(" ");
malcolmlear 3:8eee79f59b30 131 lcd.printf("Switches = %d\n", switches);
malcolmlear 3:8eee79f59b30 132 wait(1);
malcolmlear 3:8eee79f59b30 133 int keys = readkeys();
malcolmlear 3:8eee79f59b30 134 lcd.printf(" ");
malcolmlear 3:8eee79f59b30 135 lcd.printf("Keys = %d\n", keys);
malcolmlear 3:8eee79f59b30 136 wait(1);
malcolmlear 3:8eee79f59b30 137 int key = readkey(5);
malcolmlear 3:8eee79f59b30 138 lcd.printf(" ");
malcolmlear 3:8eee79f59b30 139 lcd.printf("Key5 = %d\n", key);
malcolmlear 0:416329806e55 140 }
malcolmlear 0:416329806e55 141 }