- #include "quantum.h"
- #include "ws2812.h"
-
- /* Adapted from https://github.com/gamazeps/ws2812b-chibios-SPIDMA/ */
-
- // 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
-
- #ifndef WS2812_SPI_SCK_PAL_MODE
- # define WS2812_SPI_SCK_PAL_MODE 5
- #endif
-
- // Push Pull or Open Drain Configuration
- // Default Push Pull
- #ifndef WS2812_EXTERNAL_PULLUP
- # if defined(USE_GPIOV1)
- # define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE_PUSHPULL
- # else
- # define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL
- # endif
- #else
- # if defined(USE_GPIOV1)
- # define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE_OPENDRAIN
- # else
- # define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_OUTPUT_TYPE_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_CR1_BR_X (0)
- #elif WS2812_SPI_DIVISOR == 4
- # define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_0)
- #elif WS2812_SPI_DIVISOR == 8
- # define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1)
- #elif WS2812_SPI_DIVISOR == 16 // same as default
- # define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1 | SPI_CR1_BR_0)
- #elif WS2812_SPI_DIVISOR == 32
- # define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2)
- #elif WS2812_SPI_DIVISOR == 64
- # define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_0)
- #elif WS2812_SPI_DIVISOR == 128
- # define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1)
- #elif WS2812_SPI_DIVISOR == 256
- # define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0)
- #else
- # define WS2812_SPI_DIVISOR_CR1_BR_X (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
-
- #if defined(USE_GPIOV1)
- # define WS2812_SCK_OUTPUT_MODE PAL_MODE_ALTERNATE_PUSHPULL
- #else
- # define WS2812_SCK_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_SCK_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL
- #endif
-
- #define BYTES_FOR_LED_BYTE 4
- #ifdef RGBW
- # define WS2812_CHANNELS 4
- #else
- # define WS2812_CHANNELS 3
- #endif
- #define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * WS2812_CHANNELS)
- #define DATA_SIZE (BYTES_FOR_LED * RGBLED_NUM)
- #define RESET_SIZE (1000 * WS2812_TRST_US / (2 * WS2812_TIMING))
- #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
- #ifdef RGBW
- for (int j = 0; j < 4; j++)
- tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 4 + j] = get_protocol_eq(color.w, j);
- #endif
- }
-
- void ws2812_init(void) {
- palSetLineMode(RGB_DI_PIN, WS2812_MOSI_OUTPUT_MODE);
-
- #ifdef WS2812_SPI_SCK_PIN
- palSetLineMode(WS2812_SPI_SCK_PIN, WS2812_SCK_OUTPUT_MODE);
- #endif // WS2812_SPI_SCK_PIN
-
- // 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_CR1_BR_X};
-
- 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
- }
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