diff options
Diffstat (limited to 'platforms/chibios/drivers/ws2812_spi.c')
| -rw-r--r-- | platforms/chibios/drivers/ws2812_spi.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/platforms/chibios/drivers/ws2812_spi.c b/platforms/chibios/drivers/ws2812_spi.c new file mode 100644 index 0000000000..fe14b478ab --- /dev/null +++ b/platforms/chibios/drivers/ws2812_spi.c @@ -0,0 +1,159 @@ +#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 + +#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_STM32_ALTERNATE_PUSHPULL +# else +# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL +# endif +#else +# if defined(USE_GPIOV1) +# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN +# else +# define WS2812_MOSI_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_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_STM32_ALTERNATE_PUSHPULL +#else +# define WS2812_SCK_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_SCK_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL +#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_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 +} |