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121 Kevin 1 
#include "led_backpack.h"
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#include "i2c.h"
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static const char numbertable[] = {
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    0x3F /* 0 */,
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    0x06 /* 1 */,
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    0x5B /* 2 */,
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    0x4F /* 3 */,
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    0x66 /* 4 */,
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    0x6D /* 5 */,
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    0x7D, /* 6 */
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    0x07, /* 7 */
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    0x7F, /* 8 */
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    0x6F, /* 9 */
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};
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static const char alphatable[] = {
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    0x77, /* a */
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    0x7C, /* b */
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    0x39, /* C */
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    0x5E, /* d */
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    0x79, /* E */
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    0x71, /* F */
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};
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static LED_DATA led_data;
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void LED_Init() {
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    led_data.i2c_address = 0x70;
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}
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void LED_Start() {
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    unsigned char result;
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    unsigned char c = 0x21;     // Cmd to turn on oscillator
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    I2C_Master_Send(led_data.i2c_address, 1, &c);
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    result = I2C_Get_Status();
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    while (!result) {
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        result = I2C_Get_Status();
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    }
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    LED_blinkRate(HT16K33_BLINK_OFF);
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    LED_setBrightness(15);  // Max brightness
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    LED_clear();
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}
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void LED_setBrightness(unsigned char c) {
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    unsigned char result;
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    if (c > 15) c = 15;
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    c |= 0xE0;
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    I2C_Master_Send(led_data.i2c_address, 1, &c);
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    result = I2C_Get_Status();
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    while (!result) {
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        result = I2C_Get_Status();
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    }
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}
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void LED_blinkRate(unsigned char c) {
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    unsigned char buffer;
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    if (c > 3) c = 0;
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    buffer = HT16K33_BLINK_CMD | HT16K33_BLINK_DISPLAYON | (c << 1);
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    I2C_Master_Send(led_data.i2c_address, 1, &buffer);
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    buffer = I2C_Get_Status();
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    while (!buffer) {
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        buffer = I2C_Get_Status();
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    }
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}
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void LED_writeDisplay() {
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    unsigned char result;
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    led_data.display_buffer[0] = 0x00;  // Start at address 0x00
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    I2C_Master_Send(led_data.i2c_address, 17, led_data.display_buffer);
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    result = I2C_Get_Status();
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    while (!result) {
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        result = I2C_Get_Status();
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    }
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}
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void LED_clear() {
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    unsigned char c;
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    for (c = 0; c < 17; c++) {
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        led_data.display_buffer[c] = 0;
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    }
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}
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void LED_drawColon(unsigned char c) {
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    if (c) {
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        led_data.display_buffer[5] = 0xFF;
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    } else {
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        led_data.display_buffer[5] = 0;
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    }
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}
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void LED_writeDigitRaw(unsigned char loc, unsigned char bitmask) {
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    if (loc > 4) return;
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    led_data.display_buffer[(loc<<1)+1] = bitmask;
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}
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void LED_writeDigitNum(unsigned char loc, unsigned char num, unsigned char dot) {
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    if (loc > 4) return;
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    if (loc > 1) loc++;
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    LED_writeDigitRaw(loc, numbertable[num] | dot << 7);
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}
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void LED_writeDigitAlpha(unsigned char loc, unsigned char alpha, unsigned char dot) {
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    if (loc > 4) return;
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    if (loc > 1) loc++;
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    LED_writeDigitRaw(loc, alphatable[alpha] | dot << 7);
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}
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void LED_writeNum(unsigned int i) {
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    LED_writeDigitNum(0, (i%10000)/1000, 0);
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    LED_writeDigitNum(1, (i%1000)/100, 0);
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    LED_writeDigitNum(2, (i%100)/10, 0);
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    LED_writeDigitNum(3, i%10, 0);
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    if (i < 10) {
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        LED_writeDigitRaw(0, 0);
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        LED_writeDigitRaw(1, 0);
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        LED_writeDigitRaw(3, 0);
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    } else if (i < 100) {
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        LED_writeDigitRaw(0, 0);
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        LED_writeDigitRaw(1, 0);
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    } else if (i < 1000) {
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        LED_writeDigitRaw(0, 0);
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    }
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    LED_writeDisplay();
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}