134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
/*
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* LEDDriver.c
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*
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* Created on: Aug 26, 2013
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* Author: Omri Iluz
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*/
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#include "ws2812.h"
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#include "stdlib.h"
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#define BYTES_FOR_LED_BYTE 4
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#define NB_COLORS 3
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#define BYTES_FOR_LED BYTES_FOR_LED_BYTE*NB_COLORS
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#define DATA_SIZE BYTES_FOR_LED*NB_LEDS
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#define RESET_SIZE 200
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#define PREAMBLE_SIZE 4
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// Define the spi your LEDs are plugged to here
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#define WS2812_SPI SPID2
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// Define the number of LEDs you wish to control in your LED strip
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#define NB_LEDS RGBLED_NUM
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#define LED_SPIRAL 1
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static uint8_t txbuf[PREAMBLE_SIZE + DATA_SIZE + RESET_SIZE];
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static uint8_t get_protocol_eq(uint8_t data, int pos);
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/*
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* This lib is meant to be used asynchronously, thus the colors contained in
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* the txbuf will be sent in loop, so that the colors are always the ones you
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* put in the table (the user thus have less to worry about)
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*
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* Since the data are sent via DMA, and the call to spiSend is a blocking one,
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* the processor ressources are not used to much, if you see your program being
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* too slow, simply add a:
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* chThdSleepMilliseconds(x);
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* after the spiSend, where you increment x untill you are satisfied with your
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* program speed, another trick may be to lower this thread priority : your call
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*/
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static THD_WORKING_AREA(LEDS_THREAD_WA, 128);
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static THD_FUNCTION(ledsThread, arg) {
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(void) arg;
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while(1){
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spiSend(&WS2812_SPI, PREAMBLE_SIZE + DATA_SIZE + RESET_SIZE, txbuf);
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}
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}
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static const SPIConfig spicfg = {
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false,
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NULL,
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PORT_WS2812,
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PIN_WS2812,
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SPI_CR1_BR_1|SPI_CR1_BR_0 // baudrate : fpclk / 8 => 1tick is 0.32us (2.25 MHz)
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};
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/*
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* Function used to initialize the driver.
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*
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* Starts by shutting off all the LEDs.
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* Then gets access on the LED_SPI driver.
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* May eventually launch an animation on the LEDs (e.g. a thread setting the
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* txbuff values)
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*/
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void leds_init(void){
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/* MOSI pin*/
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palSetPadMode(PORT_WS2812, PIN_WS2812, PAL_MODE_STM32_ALTERNATE_PUSHPULL);
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for(int i = 0; i < RESET_SIZE; i++)
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txbuf[DATA_SIZE+i] = 0x00;
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for (int i=0; i<PREAMBLE_SIZE; i++)
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txbuf[i] = 0x00;
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spiAcquireBus(&WS2812_SPI); /* Acquire ownership of the bus. */
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spiStart(&WS2812_SPI, &spicfg); /* Setup transfer parameters. */
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spiSelect(&WS2812_SPI); /* Slave Select assertion. */
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chThdCreateStatic(LEDS_THREAD_WA, sizeof(LEDS_THREAD_WA),NORMALPRIO, ledsThread, NULL);
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}
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/*
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* As the trick here is to use the SPI to send a huge pattern of 0 and 1 to
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* the ws2812b protocol, we use this helper function to translate bytes into
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* 0s and 1s for the LED (with the appropriate timing).
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*/
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static uint8_t get_protocol_eq(uint8_t data, int pos){
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uint8_t eq = 0;
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if (data & (1 << (2*(3-pos))))
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eq = 0b1110;
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else
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eq = 0b1000;
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if (data & (2 << (2*(3-pos))))
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eq += 0b11100000;
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else
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eq += 0b10000000;
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return eq;
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}
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void WS2812_init(void) {
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leds_init();
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}
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void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds) {
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uint8_t i = 0;
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while (i < number_of_leds) {
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set_led_color_rgb(ledarray[i], i);
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i++;
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}
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}
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/*
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* If you want to set a LED's color in the RGB color space, simply call this
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* function with a hsv_color containing the desired color and the index of the
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* led on the LED strip (starting from 0, the first one being the closest the
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* first plugged to the board)
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*
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* Only set the color of the LEDs through the functions given by this API
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* (unless you really know what you are doing)
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*/
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void set_led_color_rgb(LED_TYPE color, int pos){
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for(int j = 0; j < 4; j++)
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txbuf[PREAMBLE_SIZE + BYTES_FOR_LED*pos + j] = get_protocol_eq(color.g, j);
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for(int j = 0; j < 4; j++)
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txbuf[PREAMBLE_SIZE + BYTES_FOR_LED*pos + BYTES_FOR_LED_BYTE+j] = get_protocol_eq(color.r, j);
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for(int j = 0; j < 4; j++)
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txbuf[PREAMBLE_SIZE + BYTES_FOR_LED*pos + BYTES_FOR_LED_BYTE*2+j] = get_protocol_eq(color.b, j);
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}
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void set_leds_color_rgb(LED_TYPE color){
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for(int i = 0; i < NB_LEDS; i++)
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set_led_color_rgb(color, i);
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}
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void ws2812_setleds_rgbw(LED_TYPE *ledarray, uint16_t number_of_leds) {
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}
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