Davin Nicholas / Mbed OS NixieClock

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Dependencies:   BufferedSerial

Backlight/Backlight.cpp@1:951d0ba43cb1, 2018-04-20 (annotated)

Committer:
abestat2
Date:
Fri Apr 20 01:52:39 2018 +0000
Revision:
1:951d0ba43cb1
Changed Backlight from library to folder

Who changed what in which revision?

UserRevisionLine numberNew contents of line
abestat2 1:951d0ba43cb1 1 #include "mbed.h"
abestat2 1:951d0ba43cb1 2 #include "Backlight.h"
abestat2 1:951d0ba43cb1 3 #include "ColorDefs.h"
abestat2 1:951d0ba43cb1 4
abestat2 1:951d0ba43cb1 5 Backlight::Backlight(PinName mosiPin) : _bus(mosiPin,NC,D13) {
abestat2 1:951d0ba43cb1 6
abestat2 1:951d0ba43cb1 7 _bus.format(8,1);
abestat2 1:951d0ba43cb1 8 _bus.frequency(3333333); // 1/0.3us (4 pixels per out clock)
abestat2 1:951d0ba43cb1 9 _brightness = 1.0;
abestat2 1:951d0ba43cb1 10
abestat2 1:951d0ba43cb1 11 _statusColor = COLOR_OFF;
abestat2 1:951d0ba43cb1 12
abestat2 1:951d0ba43cb1 13 CreateRawData();
abestat2 1:951d0ba43cb1 14 WritePixels();
abestat2 1:951d0ba43cb1 15 }
abestat2 1:951d0ba43cb1 16
abestat2 1:951d0ba43cb1 17 void Backlight::UpdateBrightness(float brightness) {
abestat2 1:951d0ba43cb1 18 _brightness = brightness;
abestat2 1:951d0ba43cb1 19 }
abestat2 1:951d0ba43cb1 20
abestat2 1:951d0ba43cb1 21 void Backlight::UpdateBacklight(BacklightStatus status) {
abestat2 1:951d0ba43cb1 22
abestat2 1:951d0ba43cb1 23 switch(status) {
abestat2 1:951d0ba43cb1 24 case BACKLIGHT_OK:
abestat2 1:951d0ba43cb1 25 _statusColor = COLOR_OK;
abestat2 1:951d0ba43cb1 26 break;
abestat2 1:951d0ba43cb1 27 case BACKLIGHT_CONFIG:
abestat2 1:951d0ba43cb1 28 _statusColor = COLOR_CONFIG;
abestat2 1:951d0ba43cb1 29 break;
abestat2 1:951d0ba43cb1 30 case BACKLIGHT_OFF:
abestat2 1:951d0ba43cb1 31 _statusColor = COLOR_OFF;
abestat2 1:951d0ba43cb1 32 break;
abestat2 1:951d0ba43cb1 33 case BACKLIGHT_ERROR:
abestat2 1:951d0ba43cb1 34 default:
abestat2 1:951d0ba43cb1 35 _statusColor = COLOR_ERROR;
abestat2 1:951d0ba43cb1 36 break;
abestat2 1:951d0ba43cb1 37 }
abestat2 1:951d0ba43cb1 38
abestat2 1:951d0ba43cb1 39 CreateRawData();
abestat2 1:951d0ba43cb1 40
abestat2 1:951d0ba43cb1 41 WritePixels();
abestat2 1:951d0ba43cb1 42 }
abestat2 1:951d0ba43cb1 43
abestat2 1:951d0ba43cb1 44 void Backlight::CreateRawData(void) {
abestat2 1:951d0ba43cb1 45 // Encode '0' bits as 1000 and '1' bits as 1100.
abestat2 1:951d0ba43cb1 46 // Rearrange this partern: abcdefgh into this: 1a001b0001c001d001e001f001g001h00
abestat2 1:951d0ba43cb1 47
abestat2 1:951d0ba43cb1 48 // 255 - 0xCCCCCCCC; 0 - 0x88888888
abestat2 1:951d0ba43cb1 49
abestat2 1:951d0ba43cb1 50 uint32_t pixelColor,base;
abestat2 1:951d0ba43cb1 51 base = 0x88888888;
abestat2 1:951d0ba43cb1 52
abestat2 1:951d0ba43cb1 53 for(int i = 0; i < NUM_PIXELS; i++) {
abestat2 1:951d0ba43cb1 54 for(int j = 0; j < NUM_COLORS_PER_PIXEL; j++) {
abestat2 1:951d0ba43cb1 55 uint32_t tempColor = (uint32_t)_statusColor[i][j]*_brightness;
abestat2 1:951d0ba43cb1 56 pixelColor = (tempColor << 26) & 0x40000000;
abestat2 1:951d0ba43cb1 57 pixelColor |= (tempColor << 23) & 0x04000000;
abestat2 1:951d0ba43cb1 58 pixelColor |= (tempColor << 20) & 0x00400000;
abestat2 1:951d0ba43cb1 59 pixelColor |= (tempColor << 17) & 0x00040000;
abestat2 1:951d0ba43cb1 60 pixelColor |= (tempColor << 14) & 0x00004000;
abestat2 1:951d0ba43cb1 61 pixelColor |= (tempColor << 11) & 0x00000400;
abestat2 1:951d0ba43cb1 62 pixelColor |= (tempColor << 8) & 0x00000040;
abestat2 1:951d0ba43cb1 63 pixelColor |= (tempColor << 5) & 0x00000004;
abestat2 1:951d0ba43cb1 64 pixelColor |= base;
abestat2 1:951d0ba43cb1 65 // Invert signal since MOSI is idle high so idle can be 0
abestat2 1:951d0ba43cb1 66 pixelColor = ~pixelColor;
abestat2 1:951d0ba43cb1 67 _rawPixelData[(i*NUM_BYTES_PER_COLOR*NUM_COLORS_PER_PIXEL)+(j*NUM_BYTES_PER_COLOR)] = pixelColor & 0x000000FF;
abestat2 1:951d0ba43cb1 68 _rawPixelData[(i*NUM_BYTES_PER_COLOR*NUM_COLORS_PER_PIXEL)+(j*NUM_BYTES_PER_COLOR)+1] = (pixelColor >> 8) & 0x000000FF;
abestat2 1:951d0ba43cb1 69 _rawPixelData[(i*NUM_BYTES_PER_COLOR*NUM_COLORS_PER_PIXEL)+(j*NUM_BYTES_PER_COLOR)+2] = (pixelColor >> 16) & 0x000000FF;
abestat2 1:951d0ba43cb1 70 _rawPixelData[(i*NUM_BYTES_PER_COLOR*NUM_COLORS_PER_PIXEL)+(j*NUM_BYTES_PER_COLOR)+3] = (pixelColor >> 24) & 0x000000FF;
abestat2 1:951d0ba43cb1 71 }
abestat2 1:951d0ba43cb1 72 }
abestat2 1:951d0ba43cb1 73 }
abestat2 1:951d0ba43cb1 74
abestat2 1:951d0ba43cb1 75 void Backlight::WritePixels(void) {
abestat2 1:951d0ba43cb1 76 _bus.lock();
abestat2 1:951d0ba43cb1 77 _bus.write((char*)_rawPixelData,TOTAL_PIXEL_BYTES,(char*)_rxBuffer,TOTAL_PIXEL_BYTES);
abestat2 1:951d0ba43cb1 78 _bus.unlock();
abestat2 1:951d0ba43cb1 79 }