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Merge pull request #484 from wisc17/apa102 

Update LedDeviceAPA102.cpp by pcaffardi

Former-commit-id: 0e586eda7636b4abb378fe8adf1b35145e63eb1f
This commit is contained in:
tvdzwan 2016-02-08 14:55:08 +01:00
parent f3cd0451c9 79dda5e840
commit cf34f45daa
1 changed files with 35 additions and 18 deletions
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53
libsrc/leddevice/LedDeviceAPA102.cpp
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@ -1,9 +1,7 @@
// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
#include <algorithm>
// Linux includes
#include <fcntl.h>
@ -19,27 +17,46 @@ LedDeviceAPA102::LedDeviceAPA102(const std::string& outputDevice, const unsigned
// empty
}
#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define APA102_START_FRAME_BYTES 4
#define APA102_LED_BYTES 4
#define APA102_END_FRAME_BITS_MIN 32
#define APA102_END_FRAME_BITS(leds) MAX((((leds-1)/2)+1),APA102_END_FRAME_BITS_MIN)
#define APA102_END_FRAME_BYTES(leds) (((APA102_END_FRAME_BITS(leds)-1)/8)+1)
#define APA102_LED_HEADER 0xe0
#define APA102_LED_MAX_INTENSITY 0x1f
int LedDeviceAPA102::write(const std::vector<ColorRgb> &ledValues)
{
const unsigned int startFrameSize = 4;
const unsigned int endFrameSize = std::max<unsigned int>(((ledValues.size() + 15) / 16), 4);
const unsigned int mLedCount = (ledValues.size() * 4) + startFrameSize + endFrameSize;
if(_ledBuffer.size() != mLedCount){
_ledBuffer.resize(mLedCount, 0xFF);
_ledBuffer[0] = 0x00;
_ledBuffer[1] = 0x00;
_ledBuffer[2] = 0x00;
_ledBuffer[3] = 0x00;
const unsigned int startFrameSize = APA102_START_FRAME_BYTES;
const unsigned int ledsCount = ledValues.size() ;
const unsigned int ledsSize = ledsCount * APA102_LED_BYTES ;
const unsigned int endFrameBits = APA102_END_FRAME_BITS(ledsCount) ;
const unsigned int endFrameSize = APA102_END_FRAME_BYTES(ledsCount) ;
const unsigned int transferSize = startFrameSize + ledsSize + endFrameSize ;
if(_ledBuffer.size() != transferSize){
_ledBuffer.resize(transferSize, 0x00);
}
for (unsigned iLed=1; iLed<=ledValues.size(); ++iLed) {
const ColorRgb& rgb = ledValues[iLed-1];
_ledBuffer[iLed*4] = 0xFF;
_ledBuffer[iLed*4+1] = rgb.red;
_ledBuffer[iLed*4+2] = rgb.green;
_ledBuffer[iLed*4+3] = rgb.blue;
unsigned idx = 0, i;
for (i=0; i<APA102_START_FRAME_BYTES; i++) {
_ledBuffer[idx++] = 0x00 ;
}
for (i=0; i<ledsCount; i++) {
const ColorRgb& rgb = ledValues[i];
_ledBuffer[idx++] = APA102_LED_HEADER + APA102_LED_MAX_INTENSITY;
_ledBuffer[idx++] = rgb.red;
_ledBuffer[idx++] = rgb.green;
_ledBuffer[idx++] = rgb.blue;
}
for(i=0; i<endFrameSize; i++)
_ledBuffer[idx++] = 0x00 ;
return writeBytes(_ledBuffer.size(), _ledBuffer.data());
}