Weiyu Liu / Adafruit_Trellis

Mbed driver for adafruit trellis.

Dependents:   Adafruit_Trellis_Hello_World

Adafruit_Trellis.cpp@1:3a43c8b959d8, 2016-03-13 (annotated)

Committer:
wliu88
Date:
Sun Mar 13 17:31:13 2016 +0000
Revision:
1:3a43c8b959d8
Parent:
0:bbc12ba2cb6c 
comments added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wliu88 0:bbc12ba2cb6c 1 #include "mbed.h"
wliu88 0:bbc12ba2cb6c 2 #include "Adafruit_Trellis.h"
wliu88 0:bbc12ba2cb6c 3
wliu88 0:bbc12ba2cb6c 4 #define HT16K33_BLINK_CMD 0x80
wliu88 0:bbc12ba2cb6c 5 #define HT16K33_BLINK_DISPLAYON 0x01
wliu88 0:bbc12ba2cb6c 6 #define HT16K33_CMD_BRIGHTNESS 0xE0
wliu88 0:bbc12ba2cb6c 7
wliu88 0:bbc12ba2cb6c 8 /*
wliu88 0:bbc12ba2cb6c 9 These are the lookup tables that convert the LED/button #
wliu88 0:bbc12ba2cb6c 10 to the memory address in the HT16K33 - don't mess with them :)
wliu88 0:bbc12ba2cb6c 11 */
wliu88 0:bbc12ba2cb6c 12
wliu88 0:bbc12ba2cb6c 13 static const uint8_t ledLUT[16] =
wliu88 0:bbc12ba2cb6c 14 { 0x3A, 0x37, 0x35, 0x34,
wliu88 0:bbc12ba2cb6c 15 0x28, 0x29, 0x23, 0x24,
wliu88 0:bbc12ba2cb6c 16 0x16, 0x1B, 0x11, 0x10,
wliu88 0:bbc12ba2cb6c 17 0x0E, 0x0D, 0x0C, 0x02 },
wliu88 0:bbc12ba2cb6c 18 buttonLUT[16] =
wliu88 0:bbc12ba2cb6c 19 { 0x07, 0x04, 0x02, 0x22,
wliu88 0:bbc12ba2cb6c 20 0x05, 0x06, 0x00, 0x01,
wliu88 0:bbc12ba2cb6c 21 0x03, 0x10, 0x30, 0x21,
wliu88 0:bbc12ba2cb6c 22 0x13, 0x12, 0x11, 0x31 };
wliu88 0:bbc12ba2cb6c 23
wliu88 0:bbc12ba2cb6c 24 Adafruit_Trellis::Adafruit_Trellis(void) {
wliu88 0:bbc12ba2cb6c 25 }
wliu88 0:bbc12ba2cb6c 26
wliu88 0:bbc12ba2cb6c 27 void Adafruit_Trellis::begin(I2C *_wire, uint8_t _addr = 0x70) {
wliu88 0:bbc12ba2cb6c 28 // The mbed API uses 8 bit addresses, so make sure to take
wliu88 0:bbc12ba2cb6c 29 // that 7 bit address and left shift it by 1 before passing it.
wliu88 0:bbc12ba2cb6c 30 i2c_addr = (_addr << 1);
wliu88 0:bbc12ba2cb6c 31 // store pointer to the I2C class object
wliu88 0:bbc12ba2cb6c 32 wire = _wire;
wliu88 0:bbc12ba2cb6c 33
wliu88 0:bbc12ba2cb6c 34 // turn on oscillator
wliu88 0:bbc12ba2cb6c 35 cmd[0] = 0x21;
wliu88 0:bbc12ba2cb6c 36 wire->write(i2c_addr, cmd, 1);
wliu88 0:bbc12ba2cb6c 37 // set blink rate
wliu88 0:bbc12ba2cb6c 38 blinkRate(HT16K33_BLINK_OFF);
wliu88 0:bbc12ba2cb6c 39 // set brightness
wliu88 0:bbc12ba2cb6c 40 setBrightness(15); // max brightness
wliu88 0:bbc12ba2cb6c 41 // setup interrupt, active low
wliu88 0:bbc12ba2cb6c 42 cmd[0] = 0xA1;
wliu88 0:bbc12ba2cb6c 43 wire->write(i2c_addr, cmd, 1);
wliu88 0:bbc12ba2cb6c 44 }
wliu88 0:bbc12ba2cb6c 45
wliu88 0:bbc12ba2cb6c 46 /*
wliu88 0:bbc12ba2cb6c 47 Helper button functions, the data is updated every readSwitches() call!
wliu88 0:bbc12ba2cb6c 48 */
wliu88 0:bbc12ba2cb6c 49
wliu88 0:bbc12ba2cb6c 50 bool Adafruit_Trellis::isKeyPressed(uint8_t k) {
wliu88 0:bbc12ba2cb6c 51 if (k > 15) return false;
wliu88 0:bbc12ba2cb6c 52 k = buttonLUT[k];
wliu88 0:bbc12ba2cb6c 53 return (keys[k>>4] & _BV(k & 0x0F));
wliu88 0:bbc12ba2cb6c 54 }
wliu88 0:bbc12ba2cb6c 55 bool Adafruit_Trellis::wasKeyPressed(uint8_t k) {
wliu88 0:bbc12ba2cb6c 56 if (k > 15) return false;
wliu88 0:bbc12ba2cb6c 57 k = buttonLUT[k];
wliu88 0:bbc12ba2cb6c 58 return (lastkeys[k>>4] & _BV(k & 0x0F));
wliu88 0:bbc12ba2cb6c 59 }
wliu88 0:bbc12ba2cb6c 60
wliu88 0:bbc12ba2cb6c 61 bool Adafruit_Trellis::justPressed(uint8_t k) {
wliu88 0:bbc12ba2cb6c 62 return (isKeyPressed(k) & !wasKeyPressed(k));
wliu88 0:bbc12ba2cb6c 63 }
wliu88 0:bbc12ba2cb6c 64 bool Adafruit_Trellis::justReleased(uint8_t k) {
wliu88 0:bbc12ba2cb6c 65 return (!isKeyPressed(k) & wasKeyPressed(k));
wliu88 0:bbc12ba2cb6c 66 }
wliu88 0:bbc12ba2cb6c 67
wliu88 0:bbc12ba2cb6c 68 /*
wliu88 0:bbc12ba2cb6c 69 Helper LED functions, the data is written on writeDisplay()
wliu88 0:bbc12ba2cb6c 70 */
wliu88 0:bbc12ba2cb6c 71
wliu88 0:bbc12ba2cb6c 72
wliu88 0:bbc12ba2cb6c 73 bool Adafruit_Trellis::isLED(uint8_t x) {
wliu88 0:bbc12ba2cb6c 74 if (x > 15) return false;
wliu88 0:bbc12ba2cb6c 75 x = ledLUT[x];
wliu88 0:bbc12ba2cb6c 76 return ((displaybuffer[x >> 4] & _BV(x & 0x0F)) > 0);
wliu88 0:bbc12ba2cb6c 77 }
wliu88 0:bbc12ba2cb6c 78 void Adafruit_Trellis::setLED(uint8_t x) {
wliu88 0:bbc12ba2cb6c 79 if (x > 15) return;
wliu88 0:bbc12ba2cb6c 80 x = ledLUT[x];
wliu88 0:bbc12ba2cb6c 81 displaybuffer[x >> 4] |= _BV(x & 0x0F);
wliu88 0:bbc12ba2cb6c 82 }
wliu88 0:bbc12ba2cb6c 83 void Adafruit_Trellis::clrLED(uint8_t x) {
wliu88 0:bbc12ba2cb6c 84 if (x > 15) return;
wliu88 0:bbc12ba2cb6c 85 x = ledLUT[x];
wliu88 0:bbc12ba2cb6c 86 displaybuffer[x >> 4] &= ~_BV(x & 0x0F);
wliu88 0:bbc12ba2cb6c 87 }
wliu88 0:bbc12ba2cb6c 88
wliu88 0:bbc12ba2cb6c 89
wliu88 0:bbc12ba2cb6c 90 /*
wliu88 0:bbc12ba2cb6c 91 Gets the switch memory data and updates the last/current read
wliu88 0:bbc12ba2cb6c 92 */
wliu88 0:bbc12ba2cb6c 93
wliu88 0:bbc12ba2cb6c 94 bool Adafruit_Trellis::readSwitches(void) {
wliu88 0:bbc12ba2cb6c 95 memcpy(lastkeys, keys, sizeof(keys));
wliu88 0:bbc12ba2cb6c 96
wliu88 0:bbc12ba2cb6c 97 cmd[0] = 0x40;
wliu88 0:bbc12ba2cb6c 98 wire->write(i2c_addr, cmd, 1);
wliu88 0:bbc12ba2cb6c 99 wire->read(i2c_addr, cmd, 6);
wliu88 0:bbc12ba2cb6c 100
wliu88 0:bbc12ba2cb6c 101 for (uint8_t i=0; i<6; i++)
wliu88 0:bbc12ba2cb6c 102 keys[i] = cmd[i];
wliu88 0:bbc12ba2cb6c 103
wliu88 0:bbc12ba2cb6c 104 for (uint8_t i=0; i<6; i++) {
wliu88 0:bbc12ba2cb6c 105 if (lastkeys[i] != keys[i]) {
wliu88 0:bbc12ba2cb6c 106 for (uint8_t j=0; j<6; j++) {
wliu88 0:bbc12ba2cb6c 107 //Serial.print(keys[j], HEX); Serial.print(" ");
wliu88 0:bbc12ba2cb6c 108 }
wliu88 0:bbc12ba2cb6c 109 //Serial.println();
wliu88 0:bbc12ba2cb6c 110 return true;
wliu88 0:bbc12ba2cb6c 111 }
wliu88 0:bbc12ba2cb6c 112 }
wliu88 0:bbc12ba2cb6c 113 return false;
wliu88 0:bbc12ba2cb6c 114 }
wliu88 0:bbc12ba2cb6c 115
wliu88 0:bbc12ba2cb6c 116 void Adafruit_Trellis::setBrightness(uint8_t b) {
wliu88 0:bbc12ba2cb6c 117 if (b > 15) b = 15;
wliu88 0:bbc12ba2cb6c 118 cmd[0] = HT16K33_CMD_BRIGHTNESS | b;
wliu88 0:bbc12ba2cb6c 119 wire->write(i2c_addr, cmd, 1);
wliu88 0:bbc12ba2cb6c 120 }
wliu88 0:bbc12ba2cb6c 121
wliu88 0:bbc12ba2cb6c 122 void Adafruit_Trellis::blinkRate(uint8_t b) {
wliu88 0:bbc12ba2cb6c 123 if (b > 3) b = 0; // turn off if not sure
wliu88 0:bbc12ba2cb6c 124 cmd[0] = HT16K33_BLINK_CMD | HT16K33_BLINK_DISPLAYON | (b << 1);
wliu88 0:bbc12ba2cb6c 125 wire->write(i2c_addr, cmd, 1);
wliu88 0:bbc12ba2cb6c 126 }
wliu88 0:bbc12ba2cb6c 127
wliu88 0:bbc12ba2cb6c 128
wliu88 0:bbc12ba2cb6c 129 void Adafruit_Trellis::writeDisplay(void) {
wliu88 0:bbc12ba2cb6c 130 cmd[0] = 0x00;
wliu88 0:bbc12ba2cb6c 131 for (uint8_t i=0; i<8; i++) {
wliu88 0:bbc12ba2cb6c 132 cmd[2*i+1] = displaybuffer[i] & 0xFF;
wliu88 0:bbc12ba2cb6c 133 cmd[2*i+2] = displaybuffer[i] >> 8;
wliu88 0:bbc12ba2cb6c 134 }
wliu88 0:bbc12ba2cb6c 135 wire->write(i2c_addr, cmd, 17);
wliu88 0:bbc12ba2cb6c 136
wliu88 0:bbc12ba2cb6c 137 }
wliu88 0:bbc12ba2cb6c 138
wliu88 0:bbc12ba2cb6c 139 void Adafruit_Trellis::clear(void) {
wliu88 0:bbc12ba2cb6c 140 memset(displaybuffer, 0, sizeof(displaybuffer));
wliu88 0:bbc12ba2cb6c 141 }
wliu88 0:bbc12ba2cb6c 142
wliu88 0:bbc12ba2cb6c 143