91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
#include "quantum.h"
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#include "ws2812.h"
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/* Adapted from https://github.com/gamazeps/ws2812b-chibios-SPIDMA/ */
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#ifdef RGBW
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# error "RGBW not supported"
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#endif
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// Define the spi your LEDs are plugged to here
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#ifndef WS2812_SPI
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# define WS2812_SPI SPID1
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#endif
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#ifndef WS2812_SPI_MOSI_PAL_MODE
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# define WS2812_SPI_MOSI_PAL_MODE 5
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#endif
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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 * RGBLED_NUM)
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#define RESET_SIZE 200
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#define PREAMBLE_SIZE 4
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static uint8_t txbuf[PREAMBLE_SIZE + DATA_SIZE + RESET_SIZE] = {0};
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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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static void set_led_color_rgb(LED_TYPE color, int pos) {
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uint8_t* tx_start = &txbuf[PREAMBLE_SIZE];
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for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.g, j);
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for (int j = 0; j < 4; j++) tx_start[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++) tx_start[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 ws2812_init(void) {
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#if defined(USE_GPIOV1)
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palSetLineMode(RGB_DI_PIN, PAL_MODE_STM32_ALTERNATE_PUSHPULL);
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#else
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palSetLineMode(RGB_DI_PIN, PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL);
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#endif
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// TODO: more dynamic baudrate
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static const SPIConfig spicfg = {
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0, NULL, PAL_PORT(RGB_DI_PIN), PAL_PAD(RGB_DI_PIN),
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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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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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}
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void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
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static bool s_init = false;
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if (!s_init) {
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ws2812_init();
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s_init = true;
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}
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for (uint8_t i = 0; i < leds; i++) {
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set_led_color_rgb(ledarray[i], i);
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}
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// Send async - each led takes ~0.03ms, 50 leds ~1.5ms, animations flushing faster than send will cause issues.
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// Instead spiSend can be used to send synchronously (or the thread logic can be added back).
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#ifdef WS2812_SPI_SYNC
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spiSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
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#else
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spiStartSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
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#endif
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}
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