keyboards/cannonkeys/stm32f072/ws2812.c

   1 #include "ch.h"
   2 #include "hal.h"
   3
   4 #include "ws2812.h"
   5
   6 #define BYTES_FOR_LED_BYTE 4
   7 #define NB_COLORS 3
   8 #define BYTES_FOR_LED BYTES_FOR_LED_BYTE*NB_COLORS
   9 #define DATA_SIZE BYTES_FOR_LED*NB_LEDS
  10 #define RESET_SIZE 200
  11
  12 // Define the spi your LEDs are plugged to here
  13 #define LEDS_SPI WS2812_SPI
  14 // Define the number of LEDs you wish to control in your LED strip
  15 #define NB_LEDS RGBLED_NUM
  16
  17 #define LED_SPIRAL 0
  18
  19 static uint8_t txbuf[DATA_SIZE + RESET_SIZE];
  20 static uint8_t get_protocol_eq(uint8_t data, int pos);
  21
  22 /*
  23  * This lib is meant to be used asynchronously, thus the colors contained in
  24  * the txbuf will be sent in loop, so that the colors are always the ones you
  25  * put in the table (the user thus have less to worry about)
  26  *
  27  * Since the data are sent via DMA, and the call to spiSend is a blocking one,
  28  * the processor ressources are not used to much, if you see your program being
  29  * too slow, simply add a:
  30  * chThdSleepMilliseconds(x);
  31  * after the spiSend, where you increment x untill you are satisfied with your
  32  * program speed, another trick may be to lower this thread priority : your call
  33  */
  34 static THD_WORKING_AREA(LEDS_THREAD_WA, 128);
  35 static THD_FUNCTION(ledsThread, arg) {
  36   (void) arg;
  37   while(1){
  38     spiSend(&LEDS_SPI, DATA_SIZE + RESET_SIZE, txbuf);
  39   }
  40 }
  41
  42 #if LED_SPIRAL
  43 /*
  44  * 'Led spiral' is a simple demo in which we put all the leds to the same
  45  * color, where this color does all the hsv circle in loop.
  46  * If you want to launch the thread that will chage the led colors to the
  47  * appropriate value, simply set LED_SPIRAL to 1.
  48  */
  49
  50 static THD_WORKING_AREA(HSVTRANS_WA, 128);
  51 static THD_FUNCTION(hsv_transThread, arg) {
  52   (void) arg;
  53   hsv_color color = {0, 255, 255};
  54   while(1){
  55     color.h += 1;
  56     color.h %= 256;
  57     set_leds_color_hsv(color);
  58     chThdSleepMilliseconds(50);
  59   }
  60 }
  61 #endif
  62
  63 static const SPIConfig spicfg = {
  64   false,
  65   NULL,
  66   GPIOB,
  67   15,
  68   SPI_CR1_BR_1|SPI_CR1_BR_0 // baudrate : fpclk / 8 => 1tick is 0.32us
  69 };
  70
  71 /*
  72  * Function used to initialize the driver.
  73  *
  74  * Starts by shutting off all the LEDs.
  75  * Then gets access on the LED_SPI driver.
  76  * May eventually launch an animation on the LEDs (e.g. a thread setting the
  77  * txbuff values)
  78  */
  79 void leds_init(void){
  80   for(int i = 0; i < RESET_SIZE; i++)
  81     txbuf[DATA_SIZE+i] = 0x00;
  82   spiAcquireBus(&LEDS_SPI);              /* Acquire ownership of the bus.    */
  83   spiStart(&LEDS_SPI, &spicfg);          /* Setup transfer parameters.       */
  84   spiSelect(&LEDS_SPI);                  /* Slave Select assertion.          */
  85   chThdCreateStatic(LEDS_THREAD_WA, sizeof(LEDS_THREAD_WA),NORMALPRIO, ledsThread, NULL);
  86 #if LED_SPIRAL
  87   chThdCreateStatic(HSVTRANS_WA, sizeof(HSVTRANS_WA),
  88       NORMALPRIO, hsv_transThread, NULL);
  89 #endif
  90 }
  91
  92 /*
  93  * As the trick here is to use the SPI to send a huge pattern of 0 and 1 to
  94  * the ws2812b protocol, we use this helper function to translate bytes into
  95  * 0s and 1s for the LED (with the appropriate timing).
  96  */
  97 static uint8_t get_protocol_eq(uint8_t data, int pos){
  98   uint8_t eq = 0;
  99   if (data & (1 << (2*(3-pos))))
 100     eq = 0b1110;
 101   else
 102     eq = 0b1000;
 103   if (data & (2 << (2*(3-pos))))
 104     eq += 0b11100000;
 105   else
 106     eq += 0b10000000;
 107   return eq;
 108 }
 109
 110 //
 111 ///*
 112 // * If you want to set a LED's color in the RGB color space, simply call this
 113 // * function with a hsv_color containing the desired color and the index of the
 114 // * led on the LED strip (starting from 0, the first one being the closest the
 115 // * first plugged to the board)
 116 // *
 117 // * Only set the color of the LEDs through the functions given by this API
 118 // * (unless you really know what you are doing)
 119 // */
 120 void set_led_color_rgb(LED_TYPE color, int pos){
 121   for(int j = 0; j < 4; j++)
 122     txbuf[BYTES_FOR_LED*pos + j] = get_protocol_eq(color.g, j);
 123   for(int j = 0; j < 4; j++)
 124     txbuf[BYTES_FOR_LED*pos + BYTES_FOR_LED_BYTE+j] = get_protocol_eq(color.r, j);
 125   for(int j = 0; j < 4; j++)
 126     txbuf[BYTES_FOR_LED*pos + BYTES_FOR_LED_BYTE*2+j] = get_protocol_eq(color.b, j);
 127 }
 128
 129
 130 void WS2812_init(void) {
 131  leds_init();
 132 }
 133
 134 void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds) {
 135  uint8_t i = 0;
 136  while (i < number_of_leds) {
 137    set_led_color_rgb(ledarray[i], i);
 138    i++;
 139  }
 140 }
 141
 142
 143 void set_leds_color_rgb(LED_TYPE color){
 144  for(int i = 0; i < NB_LEDS; i++)
 145    set_led_color_rgb(color, i);
 146 }
 147
 148
 149 void ws2812_setleds_rgbw(LED_TYPE *ledarray, uint16_t number_of_leds) {
 150
 151 }