Diff: Adafruit_Trellis.cpp

Revision:

0:bbc12ba2cb6c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_Trellis.cpp	Sun Mar 13 04:59:13 2016 +0000
@@ -0,0 +1,143 @@
+#include "mbed.h"
+#include "Adafruit_Trellis.h"
+
+#define HT16K33_BLINK_CMD       0x80
+#define HT16K33_BLINK_DISPLAYON 0x01
+#define HT16K33_CMD_BRIGHTNESS  0xE0
+
+/*
+ These are the lookup tables that convert the LED/button #
+ to the memory address in the HT16K33 - don't mess with them :)
+ */
+
+static const uint8_t ledLUT[16] =
+{ 0x3A, 0x37, 0x35, 0x34,
+    0x28, 0x29, 0x23, 0x24,
+    0x16, 0x1B, 0x11, 0x10,
+    0x0E, 0x0D, 0x0C, 0x02 },
+buttonLUT[16] =
+{ 0x07, 0x04, 0x02, 0x22,
+    0x05, 0x06, 0x00, 0x01,
+    0x03, 0x10, 0x30, 0x21,
+    0x13, 0x12, 0x11, 0x31 };
+
+Adafruit_Trellis::Adafruit_Trellis(void) {
+}
+
+void Adafruit_Trellis::begin(I2C *_wire, uint8_t _addr = 0x70) {
+    // The mbed API uses 8 bit addresses, so make sure to take
+    // that 7 bit address and left shift it by 1 before passing it.
+    i2c_addr = (_addr << 1);
+    // store pointer to the I2C class object
+    wire = _wire;
+    
+    // turn on oscillator
+    cmd[0] = 0x21;
+    wire->write(i2c_addr, cmd, 1);
+    // set blink rate
+    blinkRate(HT16K33_BLINK_OFF);
+    // set brightness
+    setBrightness(15); // max brightness
+    // setup interrupt, active low
+    cmd[0] = 0xA1;
+    wire->write(i2c_addr, cmd, 1);
+}
+
+/*
+ Helper button functions, the data is updated every readSwitches() call!
+ */
+
+bool Adafruit_Trellis::isKeyPressed(uint8_t k) {
+    if (k > 15) return false;
+    k = buttonLUT[k];
+    return (keys[k>>4] & _BV(k & 0x0F));
+}
+bool Adafruit_Trellis::wasKeyPressed(uint8_t k) {
+    if (k > 15) return false;
+    k = buttonLUT[k];
+    return (lastkeys[k>>4] & _BV(k & 0x0F));
+}
+
+bool Adafruit_Trellis::justPressed(uint8_t k) {
+    return (isKeyPressed(k) & !wasKeyPressed(k));
+}
+bool Adafruit_Trellis::justReleased(uint8_t k) {
+    return (!isKeyPressed(k) & wasKeyPressed(k));
+}
+
+/*
+ Helper LED functions, the data is written on writeDisplay()
+ */
+
+
+bool Adafruit_Trellis::isLED(uint8_t x) {
+    if (x > 15) return false;
+    x = ledLUT[x];
+    return ((displaybuffer[x >> 4] & _BV(x & 0x0F)) > 0);
+}
+void Adafruit_Trellis::setLED(uint8_t x) {
+    if (x > 15) return;
+    x = ledLUT[x];
+    displaybuffer[x >> 4] |= _BV(x & 0x0F);
+}
+void Adafruit_Trellis::clrLED(uint8_t x) {
+    if (x > 15) return;
+    x = ledLUT[x];
+    displaybuffer[x >> 4] &= ~_BV(x & 0x0F);
+}
+
+
+/*
+ Gets the switch memory data and updates the last/current read
+ */
+
+bool Adafruit_Trellis::readSwitches(void) {
+    memcpy(lastkeys, keys, sizeof(keys));
+    
+    cmd[0] = 0x40;
+    wire->write(i2c_addr, cmd, 1);
+    wire->read(i2c_addr, cmd, 6);
+    
+    for (uint8_t i=0; i<6; i++)
+    keys[i] = cmd[i];
+    
+    for (uint8_t i=0; i<6; i++) {
+        if (lastkeys[i] != keys[i]) {
+            for (uint8_t j=0; j<6; j++) {
+                //Serial.print(keys[j], HEX); Serial.print(" ");
+            }
+            //Serial.println();
+            return true;
+        }
+    }
+    return false;
+}
+
+void Adafruit_Trellis::setBrightness(uint8_t b) {
+    if (b > 15) b = 15;
+    cmd[0] = HT16K33_CMD_BRIGHTNESS | b;
+    wire->write(i2c_addr, cmd, 1);
+}
+
+void Adafruit_Trellis::blinkRate(uint8_t b) {
+    if (b > 3) b = 0; // turn off if not sure
+    cmd[0] = HT16K33_BLINK_CMD | HT16K33_BLINK_DISPLAYON | (b << 1);
+    wire->write(i2c_addr, cmd, 1);
+}
+
+
+void Adafruit_Trellis::writeDisplay(void) {
+    cmd[0] = 0x00;
+    for (uint8_t i=0; i<8; i++) {
+        cmd[2*i+1] = displaybuffer[i] & 0xFF;
+        cmd[2*i+2] = displaybuffer[i] >> 8;
+    }
+    wire->write(i2c_addr, cmd, 17);
+    
+}
+
+void Adafruit_Trellis::clear(void) {
+    memset(displaybuffer, 0, sizeof(displaybuffer));
+}
+
+