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campapp: RGB LED amplifying #141

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campapp: RGB LED amplifying #141

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998b935
campapp: RGB LED amplifying
dos1 Jan 2, 2016
044e6cb
campapp: rgb_leds: use standard types
dos1 Jan 9, 2016
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40 changes: 35 additions & 5 deletions campapp/rgb_leds.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,15 +6,17 @@
#include <r0ketlib/fs_util.h>
#include <r0ketlib/keyin.h>
#include <string.h>
#include <math.h>
#include <stdint.h>
#include <campapp/rad1oconfig.h>

#define MAX_LED_FRAMES 50
#define BUF_SIZE 3*8*MAX_LED_FRAMES+2

unsigned char leds[BUF_SIZE];
unsigned int frames = 0;
unsigned int ctr = 0;
unsigned int framectr = 0;
uint8_t leds[BUF_SIZE];
uint8_t frames = 0;
uint16_t ctr = 0;
uint8_t framectr = 0;

void readRgbLedFile(void) {
int size = getFileSize(GLOBAL(ledfile));
Expand All @@ -40,7 +42,35 @@ void tick_rgbLeds(void) {
if(GLOBAL(rgbleds)) {
if(frames > 0) {
if(ctr == 0) {
ws2812_sendarray(&leds[framectr*3*8+2], 3*8);
uint8_t amplified[3*8];

// determine amplifier level based on the config
int8_t amplvl = GLOBAL(rgbleds_amp) - 8;
if (amplvl > 0) {
amplvl = round(sqrt(pow(2,amplvl+1)));
} else if (amplvl < 0) {
amplvl = -round(sqrt(pow(2,-amplvl+1)));
} else {
amplvl = 1;
}

// iterate through every value in the frame (3 channels * 8 LEDs)
for (int8_t i=0; i<3*8; i++) {
// copy original value
uint8_t origval = leds[(framectr*3*8+2)+i];
// set the amplified value
if (amplvl >= 0) {
amplified[i] = origval * amplvl;
if (amplvl != 0 && amplified[i] / amplvl != origval) {
// overflow!
amplified[i] = 255;
}
} else {
amplified[i] = origval / -amplvl;
}
}

ws2812_sendarray(&amplified[0], 3*8);
framectr++;
if(framectr >= frames)
framectr = 0;
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1 change: 1 addition & 0 deletions r0ketlib/config.c
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Expand Up @@ -35,6 +35,7 @@ struct CDESC the_config[]= {
{"nickbg", 255, 0, 255, 1, CFG_TYPE_DEVEL},
{"vdd_fix", 0, 0, 1, 0, 0},
{"rgbleds", 0, 0, 1, 0, 0},
{"rgbleds_amp", 8, 0, 16, 0, 0},
{ NULL, 0, 0, 0 , 0, 0},
};

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1 change: 1 addition & 0 deletions r0ketlib/config.h
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Expand Up @@ -49,6 +49,7 @@ extern char ledfile[];
#define GLOBALnickbg (the_config[13].value)
#define GLOBALvdd_fix (the_config[14].value)
#define GLOBALrgbleds (the_config[15].value)
#define GLOBALrgbleds_amp (the_config[16].value)

#define GLOBAL(x) GLOBAL ## x

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