145 lines
5.2 KiB
C
145 lines
5.2 KiB
C
#include "quantum.h"
|
|
#include "ws2812.h"
|
|
|
|
/* Adapted from https://github.com/gamazeps/ws2812b-chibios-SPIDMA/ */
|
|
|
|
#ifdef RGBW
|
|
# error "RGBW not supported"
|
|
#endif
|
|
|
|
// Define the spi your LEDs are plugged to here
|
|
#ifndef WS2812_SPI
|
|
# define WS2812_SPI SPID1
|
|
#endif
|
|
|
|
#ifndef WS2812_SPI_MOSI_PAL_MODE
|
|
# define WS2812_SPI_MOSI_PAL_MODE 5
|
|
#endif
|
|
|
|
// Push Pull or Open Drain Configuration
|
|
// Default Push Pull
|
|
#ifndef WS2812_EXTERNAL_PULLUP
|
|
# if defined(USE_GPIOV1)
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
|
|
# else
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL
|
|
# endif
|
|
#else
|
|
# if defined(USE_GPIOV1)
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
|
|
# else
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN
|
|
# endif
|
|
#endif
|
|
|
|
// Define SPI config speed
|
|
// baudrate should target 3.2MHz
|
|
// F072 fpclk = 48MHz
|
|
// 48/16 = 3Mhz
|
|
#if WS2812_SPI_DIVISOR == 2
|
|
# define WS2812_SPI_DIVISOR (0)
|
|
#elif WS2812_SPI_DIVISOR == 4
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_0)
|
|
#elif WS2812_SPI_DIVISOR == 8
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1)
|
|
#elif WS2812_SPI_DIVISOR == 16 // same as default
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1 | SPI_CR1_BR_0)
|
|
#elif WS2812_SPI_DIVISOR == 32
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2)
|
|
#elif WS2812_SPI_DIVISOR == 64
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_0)
|
|
#elif WS2812_SPI_DIVISOR == 128
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_1)
|
|
#elif WS2812_SPI_DIVISOR == 256
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0)
|
|
#else
|
|
# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1 | SPI_CR1_BR_0) // default
|
|
#endif
|
|
|
|
// Use SPI circular buffer
|
|
#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER
|
|
# define WS2812_SPI_BUFFER_MODE 1 // circular buffer
|
|
#else
|
|
# define WS2812_SPI_BUFFER_MODE 0 // normal buffer
|
|
#endif
|
|
|
|
#define BYTES_FOR_LED_BYTE 4
|
|
#define NB_COLORS 3
|
|
#define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * NB_COLORS)
|
|
#define DATA_SIZE (BYTES_FOR_LED * RGBLED_NUM)
|
|
#define RESET_SIZE (1000 * WS2812_TRST_US / (2 * 1250))
|
|
#define PREAMBLE_SIZE 4
|
|
|
|
static uint8_t txbuf[PREAMBLE_SIZE + DATA_SIZE + RESET_SIZE] = {0};
|
|
|
|
/*
|
|
* As the trick here is to use the SPI to send a huge pattern of 0 and 1 to
|
|
* the ws2812b protocol, we use this helper function to translate bytes into
|
|
* 0s and 1s for the LED (with the appropriate timing).
|
|
*/
|
|
static uint8_t get_protocol_eq(uint8_t data, int pos) {
|
|
uint8_t eq = 0;
|
|
if (data & (1 << (2 * (3 - pos))))
|
|
eq = 0b1110;
|
|
else
|
|
eq = 0b1000;
|
|
if (data & (2 << (2 * (3 - pos))))
|
|
eq += 0b11100000;
|
|
else
|
|
eq += 0b10000000;
|
|
return eq;
|
|
}
|
|
|
|
static void set_led_color_rgb(LED_TYPE color, int pos) {
|
|
uint8_t* tx_start = &txbuf[PREAMBLE_SIZE];
|
|
|
|
#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
|
|
for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.g, j);
|
|
for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.r, j);
|
|
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);
|
|
#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
|
|
for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.r, j);
|
|
for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.g, j);
|
|
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);
|
|
#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
|
|
for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.b, j);
|
|
for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.g, j);
|
|
for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 2 + j] = get_protocol_eq(color.r, j);
|
|
#endif
|
|
}
|
|
|
|
void ws2812_init(void) {
|
|
palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE);
|
|
|
|
// TODO: more dynamic baudrate
|
|
static const SPIConfig spicfg = {WS2812_SPI_BUFFER_MODE, NULL, PAL_PORT(RGB_DI_PIN), PAL_PAD(RGB_DI_PIN), WS2812_SPI_DIVISOR};
|
|
|
|
spiAcquireBus(&WS2812_SPI); /* Acquire ownership of the bus. */
|
|
spiStart(&WS2812_SPI, &spicfg); /* Setup transfer parameters. */
|
|
spiSelect(&WS2812_SPI); /* Slave Select assertion. */
|
|
#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER
|
|
spiStartSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
|
|
#endif
|
|
}
|
|
|
|
void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
|
|
static bool s_init = false;
|
|
if (!s_init) {
|
|
ws2812_init();
|
|
s_init = true;
|
|
}
|
|
|
|
for (uint8_t i = 0; i < leds; i++) {
|
|
set_led_color_rgb(ledarray[i], i);
|
|
}
|
|
|
|
// Send async - each led takes ~0.03ms, 50 leds ~1.5ms, animations flushing faster than send will cause issues.
|
|
// Instead spiSend can be used to send synchronously (or the thread logic can be added back).
|
|
#ifndef WS2812_SPI_USE_CIRCULAR_BUFFER
|
|
# ifdef WS2812_SPI_SYNC
|
|
spiSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
|
|
# else
|
|
spiStartSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
|
|
# endif
|
|
#endif
|
|
}
|