Add RGBW support to PWM and SPI drivers for ChibiOS (#14327)
* Add RGBW support to PWM and SPI drivers for ChibiOS * Apply suggestions from code review Co-authored-by: Ryan <fauxpark@gmail.com> Co-authored-by: Ryan <fauxpark@gmail.com>
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2 changed files with 44 additions and 9 deletions
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@ -5,7 +5,9 @@
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/* Adapted from https://github.com/joewa/WS2812-LED-Driver_ChibiOS/ */
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#ifdef RGBW
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# error "RGBW not supported"
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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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#ifndef WS2812_PWM_DRIVER
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@ -68,8 +70,9 @@
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* The reset period for each frame is defined in WS2812_TRST_US.
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* Calculate the number of zeroes to add at the end assuming 1.25 uS/bit:
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*/
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#define WS2812_COLOR_BITS (WS2812_CHANNELS * 8)
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#define WS2812_RESET_BIT_N (1000 * WS2812_TRST_US / 1250)
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#define WS2812_COLOR_BIT_N (RGBLED_NUM * 24) /**< Number of data bits */
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#define WS2812_COLOR_BIT_N (RGBLED_NUM * WS2812_COLOR_BITS) /**< Number of data bits */
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#define WS2812_BIT_N (WS2812_COLOR_BIT_N + WS2812_RESET_BIT_N) /**< Total number of bits in a frame */
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/**
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@ -114,7 +117,7 @@
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*
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* @return The bit index
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*/
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#define WS2812_BIT(led, byte, bit) (24 * (led) + 8 * (byte) + (7 - (bit)))
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#define WS2812_BIT(led, byte, bit) (WS2812_COLOR_BITS * (led) + 8 * (byte) + (7 - (bit)))
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#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
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/**
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@ -228,6 +231,20 @@
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# define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 0, (bit))
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#endif
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#ifdef RGBW
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/**
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* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given white bit
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*
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* @note The white byte is the last byte in the color packet
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*
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* @param[in] led: The led index [0, @ref WS2812_LED_N)
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* @param[in] bit: The bit index [0, 7]
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*
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* @return The bit index
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*/
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# define WS2812_WHITE_BIT(led, bit) WS2812_BIT((led), 3, (bit))
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#endif
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/* --- PRIVATE VARIABLES ---------------------------------------------------- */
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static uint32_t ws2812_frame_buffer[WS2812_BIT_N + 1]; /**< Buffer for a frame */
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@ -296,6 +313,17 @@ void ws2812_write_led(uint16_t led_number, uint8_t r, uint8_t g, uint8_t b) {
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ws2812_frame_buffer[WS2812_BLUE_BIT(led_number, bit)] = ((b >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
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}
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}
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void ws2812_write_led_rgbw(uint16_t led_number, uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
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// Write color to frame buffer
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for (uint8_t bit = 0; bit < 8; bit++) {
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ws2812_frame_buffer[WS2812_RED_BIT(led_number, bit)] = ((r >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
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ws2812_frame_buffer[WS2812_GREEN_BIT(led_number, bit)] = ((g >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
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ws2812_frame_buffer[WS2812_BLUE_BIT(led_number, bit)] = ((b >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
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#ifdef RGBW
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ws2812_frame_buffer[WS2812_WHITE_BIT(led_number, bit)] = ((w >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
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#endif
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}
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}
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// Setleds for standard RGB
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void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
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@ -306,6 +334,10 @@ void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
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}
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for (uint16_t i = 0; i < leds; i++) {
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#ifdef RGBW
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ws2812_write_led_rgbw(i, ledarray[i].r, ledarray[i].g, ledarray[i].b, ledarray[i].w);
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#else
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ws2812_write_led(i, ledarray[i].r, ledarray[i].g, ledarray[i].b);
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#endif
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}
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}
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@ -3,10 +3,6 @@
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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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@ -74,8 +70,12 @@
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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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#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 * RGBLED_NUM)
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#define RESET_SIZE (1000 * WS2812_TRST_US / (2 * 1250))
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#define PREAMBLE_SIZE 4
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@ -116,6 +116,9 @@ static void set_led_color_rgb(LED_TYPE color, int pos) {
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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.g, 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.r, j);
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#endif
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#ifdef RGBW
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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);
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#endif
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}
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void ws2812_init(void) {
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