211 lines
6.7 KiB
C
211 lines
6.7 KiB
C
#include "ws2812.h"
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#include "gpio.h"
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#include "util.h"
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#include "chibios_config.h"
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/* Adapted from https://github.com/gamazeps/ws2812b-chibios-SPIDMA/ */
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// Define the spi your LEDs are plugged to here
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#ifndef WS2812_SPI_DRIVER
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# define WS2812_SPI_DRIVER 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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#ifndef WS2812_SPI_SCK_PAL_MODE
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# define WS2812_SPI_SCK_PAL_MODE 5
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#endif
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#ifndef WS2812_SPI_DIVISOR
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# define WS2812_SPI_DIVISOR 16
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#endif
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// Push Pull or Open Drain Configuration
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// Default Push Pull
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#ifndef WS2812_EXTERNAL_PULLUP
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# if defined(USE_GPIOV1)
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# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE_PUSHPULL
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# else
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# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL
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# endif
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#else
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# if defined(USE_GPIOV1)
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# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE_OPENDRAIN
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# else
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# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_OUTPUT_TYPE_OPENDRAIN
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# endif
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#endif
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// Define SPI config speed
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// baudrate should target 3.2MHz
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// F072 fpclk = 48MHz
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// 48/16 = 3Mhz
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#if WS2812_SPI_DIVISOR == 2
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# define WS2812_SPI_DIVISOR_CR1_BR_X (0)
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#elif WS2812_SPI_DIVISOR == 4
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# define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_0)
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#elif WS2812_SPI_DIVISOR == 8
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# define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1)
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#elif WS2812_SPI_DIVISOR == 16 // default
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# define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_1 | SPI_CR1_BR_0)
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#elif WS2812_SPI_DIVISOR == 32
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# define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2)
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#elif WS2812_SPI_DIVISOR == 64
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# define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_0)
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#elif WS2812_SPI_DIVISOR == 128
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# define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1)
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#elif WS2812_SPI_DIVISOR == 256
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# define WS2812_SPI_DIVISOR_CR1_BR_X (SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0)
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#else
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# error "Configured WS2812_SPI_DIVISOR value is not supported at this time."
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#endif
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// Use SPI circular buffer
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#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER
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# define WS2812_SPI_BUFFER_MODE 1 // circular buffer
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#else
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# define WS2812_SPI_BUFFER_MODE 0 // normal buffer
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#endif
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#if defined(USE_GPIOV1)
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# define WS2812_SCK_OUTPUT_MODE PAL_MODE_ALTERNATE_PUSHPULL
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#else
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# define WS2812_SCK_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_SCK_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL
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#endif
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#define BYTES_FOR_LED_BYTE 4
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#ifdef RGBW
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# define WS2812_CHANNELS 4
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#else
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# define WS2812_CHANNELS 3
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#endif
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#define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * WS2812_CHANNELS)
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#define DATA_SIZE (BYTES_FOR_LED * WS2812_LED_COUNT)
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#define RESET_SIZE (1000 * WS2812_TRST_US / (2 * WS2812_TIMING))
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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(rgb_led_t color, int pos) {
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uint8_t* tx_start = &txbuf[PREAMBLE_SIZE];
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#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
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for (int j = 0; j < 4; j++)
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tx_start[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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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++)
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tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 2 + j] = get_protocol_eq(color.b, j);
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#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
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for (int j = 0; j < 4; j++)
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tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.r, j);
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for (int j = 0; j < 4; j++)
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tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.g, j);
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for (int j = 0; j < 4; j++)
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tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 2 + j] = get_protocol_eq(color.b, j);
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#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
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for (int j = 0; j < 4; j++)
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tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.b, j);
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for (int j = 0; j < 4; j++)
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tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.g, j);
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for (int j = 0; j < 4; j++)
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tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 2 + j] = get_protocol_eq(color.r, j);
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#endif
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#ifdef RGBW
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for (int j = 0; j < 4; j++)
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tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 4 + j] = get_protocol_eq(color.w, j);
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#endif
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}
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void ws2812_init(void) {
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palSetLineMode(WS2812_DI_PIN, WS2812_MOSI_OUTPUT_MODE);
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#ifdef WS2812_SPI_SCK_PIN
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palSetLineMode(WS2812_SPI_SCK_PIN, WS2812_SCK_OUTPUT_MODE);
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#endif // WS2812_SPI_SCK_PIN
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// TODO: more dynamic baudrate
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static const SPIConfig spicfg = {
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#ifndef HAL_LLD_SELECT_SPI_V2
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// HAL_SPI_V1
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# if SPI_SUPPORTS_CIRCULAR == TRUE
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WS2812_SPI_BUFFER_MODE,
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# endif
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NULL, // end_cb
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PAL_PORT(WS2812_DI_PIN),
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PAL_PAD(WS2812_DI_PIN),
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# if defined(WB32F3G71xx) || defined(WB32FQ95xx)
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0,
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0,
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WS2812_SPI_DIVISOR
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# else
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WS2812_SPI_DIVISOR_CR1_BR_X,
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0
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# endif
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#else
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// HAL_SPI_V2
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# if SPI_SUPPORTS_CIRCULAR == TRUE
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WS2812_SPI_BUFFER_MODE,
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# endif
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# if SPI_SUPPORTS_SLAVE_MODE == TRUE
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false,
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# endif
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NULL, // data_cb
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NULL, // error_cb
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PAL_PORT(WS2812_DI_PIN),
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PAL_PAD(WS2812_DI_PIN),
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WS2812_SPI_DIVISOR_CR1_BR_X,
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0
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#endif
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};
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spiAcquireBus(&WS2812_SPI_DRIVER); /* Acquire ownership of the bus. */
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spiStart(&WS2812_SPI_DRIVER, &spicfg); /* Setup transfer parameters. */
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spiSelect(&WS2812_SPI_DRIVER); /* Slave Select assertion. */
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#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER
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spiStartSend(&WS2812_SPI_DRIVER, ARRAY_SIZE(txbuf), txbuf);
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#endif
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}
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void ws2812_setleds(rgb_led_t* 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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#ifndef WS2812_SPI_USE_CIRCULAR_BUFFER
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# ifdef WS2812_SPI_SYNC
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spiSend(&WS2812_SPI_DRIVER, ARRAY_SIZE(txbuf), txbuf);
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# else
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spiStartSend(&WS2812_SPI_DRIVER, ARRAY_SIZE(txbuf), txbuf);
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# endif
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#endif
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}
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