- #include "ws2812.h"
- #include "quantum.h"
- #include <hal.h>
-
- /* Adapted from https://github.com/joewa/WS2812-LED-Driver_ChibiOS/ */
-
- #ifdef RGBW
- # define WS2812_CHANNELS 4
- #else
- # define WS2812_CHANNELS 3
- #endif
-
- #ifndef WS2812_PWM_DRIVER
- # define WS2812_PWM_DRIVER PWMD2 // TIMx
- #endif
- #ifndef WS2812_PWM_CHANNEL
- # define WS2812_PWM_CHANNEL 2 // Channel
- #endif
- #ifndef WS2812_PWM_PAL_MODE
- # define WS2812_PWM_PAL_MODE 2 // DI Pin's alternate function value
- #endif
- #ifndef WS2812_DMA_STREAM
- # define WS2812_DMA_STREAM STM32_DMA1_STREAM2 // DMA Stream for TIMx_UP
- #endif
- #ifndef WS2812_DMA_CHANNEL
- # define WS2812_DMA_CHANNEL 2 // DMA Channel for TIMx_UP
- #endif
- #if (STM32_DMA_SUPPORTS_DMAMUX == TRUE) && !defined(WS2812_DMAMUX_ID)
- # error "please consult your MCU's datasheet and specify in your config.h: #define WS2812_DMAMUX_ID STM32_DMAMUX1_TIM?_UP"
- #endif
-
- #ifndef WS2812_PWM_COMPLEMENTARY_OUTPUT
- # define WS2812_PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH
- #else
- # if !STM32_PWM_USE_ADVANCED
- # error "WS2812_PWM_COMPLEMENTARY_OUTPUT requires STM32_PWM_USE_ADVANCED == TRUE"
- # endif
- # define WS2812_PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
- #endif
-
- // Push Pull or Open Drain Configuration
- // Default Push Pull
- #ifndef WS2812_EXTERNAL_PULLUP
- # if defined(USE_GPIOV1)
- # define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE_PUSHPULL
- # else
- # define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_PWM_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST | PAL_PUPDR_FLOATING
- # endif
- #else
- # if defined(USE_GPIOV1)
- # define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE_OPENDRAIN
- # else
- # define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_PWM_PAL_MODE) | PAL_OUTPUT_TYPE_OPENDRAIN | PAL_OUTPUT_SPEED_HIGHEST | PAL_PUPDR_FLOATING
- # endif
- #endif
-
- #ifndef WS2812_PWM_TARGET_PERIOD
- //# define WS2812_PWM_TARGET_PERIOD 800000 // Original code is 800k...?
- # define WS2812_PWM_TARGET_PERIOD 80000 // TODO: work out why 10x less on f303/f4x1
- #endif
-
- /* --- PRIVATE CONSTANTS ---------------------------------------------------- */
-
- #define WS2812_PWM_FREQUENCY (CPU_CLOCK / 2) /**< Clock frequency of PWM, must be valid with respect to system clock! */
- #define WS2812_PWM_PERIOD (WS2812_PWM_FREQUENCY / WS2812_PWM_TARGET_PERIOD) /**< Clock period in ticks. 1 / 800kHz = 1.25 uS (as per datasheet) */
-
- /**
- * @brief Number of bit-periods to hold the data line low at the end of a frame
- *
- * The reset period for each frame is defined in WS2812_TRST_US.
- * Calculate the number of zeroes to add at the end assuming 1.25 uS/bit:
- */
- #define WS2812_COLOR_BITS (WS2812_CHANNELS * 8)
- #define WS2812_RESET_BIT_N (1000 * WS2812_TRST_US / WS2812_TIMING)
- #define WS2812_COLOR_BIT_N (RGBLED_NUM * WS2812_COLOR_BITS) /**< Number of data bits */
- #define WS2812_BIT_N (WS2812_COLOR_BIT_N + WS2812_RESET_BIT_N) /**< Total number of bits in a frame */
-
- /**
- * @brief High period for a zero, in ticks
- *
- * Per the datasheet:
- * WS2812:
- * - T0H: 200 nS to 500 nS, inclusive
- * - T0L: 650 nS to 950 nS, inclusive
- * WS2812B:
- * - T0H: 200 nS to 500 nS, inclusive
- * - T0L: 750 nS to 1050 nS, inclusive
- *
- * The duty cycle is calculated for a high period of 350 nS.
- */
- #define WS2812_DUTYCYCLE_0 (WS2812_PWM_FREQUENCY / (1000000000 / 350))
-
- /**
- * @brief High period for a one, in ticks
- *
- * Per the datasheet:
- * WS2812:
- * - T1H: 550 nS to 850 nS, inclusive
- * - T1L: 450 nS to 750 nS, inclusive
- * WS2812B:
- * - T1H: 750 nS to 1050 nS, inclusive
- * - T1L: 200 nS to 500 nS, inclusive
- *
- * The duty cycle is calculated for a high period of 800 nS.
- * This is in the middle of the specifications of the WS2812 and WS2812B.
- */
- #define WS2812_DUTYCYCLE_1 (WS2812_PWM_FREQUENCY / (1000000000 / 800))
-
- /* --- PRIVATE MACROS ------------------------------------------------------- */
-
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given bit
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] byte: The byte number [0, 2]
- * @param[in] bit: The bit number [0, 7]
- *
- * @return The bit index
- */
- #define WS2812_BIT(led, byte, bit) (WS2812_COLOR_BITS * (led) + 8 * (byte) + (7 - (bit)))
-
- #if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
- *
- * @note The red byte is the middle byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit number [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 1, (bit))
-
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
- *
- * @note The red byte is the first byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit number [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 0, (bit))
-
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
- *
- * @note The red byte is the last byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit index [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 2, (bit))
-
- #elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
- *
- * @note The red byte is the middle byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit number [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 0, (bit))
-
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
- *
- * @note The red byte is the first byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit number [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 1, (bit))
-
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
- *
- * @note The red byte is the last byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit index [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 2, (bit))
-
- #elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
- *
- * @note The red byte is the middle byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit number [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 2, (bit))
-
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
- *
- * @note The red byte is the first byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit number [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 1, (bit))
-
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
- *
- * @note The red byte is the last byte in the color packet
- *
- * @param[in] led: The led index [0, @ref RGBLED_NUM)
- * @param[in] bit: The bit index [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 0, (bit))
- #endif
-
- #ifdef RGBW
- /**
- * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given white bit
- *
- * @note The white byte is the last byte in the color packet
- *
- * @param[in] led: The led index [0, @ref WS2812_LED_N)
- * @param[in] bit: The bit index [0, 7]
- *
- * @return The bit index
- */
- # define WS2812_WHITE_BIT(led, bit) WS2812_BIT((led), 3, (bit))
- #endif
-
- /* --- PRIVATE VARIABLES ---------------------------------------------------- */
-
- static uint32_t ws2812_frame_buffer[WS2812_BIT_N + 1]; /**< Buffer for a frame */
-
- /* --- PUBLIC FUNCTIONS ----------------------------------------------------- */
- /*
- * Gedanke: Double-buffer type transactions: double buffer transfers using two memory pointers for
- the memory (while the DMA is reading/writing from/to a buffer, the application can
- write/read to/from the other buffer).
- */
-
- void ws2812_init(void) {
- // Initialize led frame buffer
- uint32_t i;
- for (i = 0; i < WS2812_COLOR_BIT_N; i++)
- ws2812_frame_buffer[i] = WS2812_DUTYCYCLE_0; // All color bits are zero duty cycle
- for (i = 0; i < WS2812_RESET_BIT_N; i++)
- ws2812_frame_buffer[i + WS2812_COLOR_BIT_N] = 0; // All reset bits are zero
-
- palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE);
-
- // PWM Configuration
- //#pragma GCC diagnostic ignored "-Woverride-init" // Turn off override-init warning for this struct. We use the overriding ability to set a "default" channel config
- static const PWMConfig ws2812_pwm_config = {
- .frequency = WS2812_PWM_FREQUENCY,
- .period = WS2812_PWM_PERIOD, // Mit dieser Periode wird UDE-Event erzeugt und ein neuer Wert (Länge WS2812_BIT_N) vom DMA ins CCR geschrieben
- .callback = NULL,
- .channels =
- {
- [0 ... 3] = {.mode = PWM_OUTPUT_DISABLED, .callback = NULL}, // Channels default to disabled
- [WS2812_PWM_CHANNEL - 1] = {.mode = WS2812_PWM_OUTPUT_MODE, .callback = NULL}, // Turn on the channel we care about
- },
- .cr2 = 0,
- .dier = TIM_DIER_UDE, // DMA on update event for next period
- };
- //#pragma GCC diagnostic pop // Restore command-line warning options
-
- // Configure DMA
- // dmaInit(); // Joe added this
- dmaStreamAlloc(WS2812_DMA_STREAM - STM32_DMA_STREAM(0), 10, NULL, NULL);
- dmaStreamSetPeripheral(WS2812_DMA_STREAM, &(WS2812_PWM_DRIVER.tim->CCR[WS2812_PWM_CHANNEL - 1])); // Ziel ist der An-Zeit im Cap-Comp-Register
- dmaStreamSetMemory0(WS2812_DMA_STREAM, ws2812_frame_buffer);
- dmaStreamSetTransactionSize(WS2812_DMA_STREAM, WS2812_BIT_N);
- dmaStreamSetMode(WS2812_DMA_STREAM, STM32_DMA_CR_CHSEL(WS2812_DMA_CHANNEL) | STM32_DMA_CR_DIR_M2P | STM32_DMA_CR_PSIZE_WORD | STM32_DMA_CR_MSIZE_WORD | STM32_DMA_CR_MINC | STM32_DMA_CR_CIRC | STM32_DMA_CR_PL(3));
- // M2P: Memory 2 Periph; PL: Priority Level
-
- #if (STM32_DMA_SUPPORTS_DMAMUX == TRUE)
- // If the MCU has a DMAMUX we need to assign the correct resource
- dmaSetRequestSource(WS2812_DMA_STREAM, WS2812_DMAMUX_ID);
- #endif
-
- // Start DMA
- dmaStreamEnable(WS2812_DMA_STREAM);
-
- // Configure PWM
- // NOTE: It's required that preload be enabled on the timer channel CCR register. This is currently enabled in the
- // ChibiOS driver code, so we don't have to do anything special to the timer. If we did, we'd have to start the timer,
- // disable counting, enable the channel, and then make whatever configuration changes we need.
- pwmStart(&WS2812_PWM_DRIVER, &ws2812_pwm_config);
- pwmEnableChannel(&WS2812_PWM_DRIVER, WS2812_PWM_CHANNEL - 1, 0); // Initial period is 0; output will be low until first duty cycle is DMA'd in
- }
-
- void ws2812_write_led(uint16_t led_number, uint8_t r, uint8_t g, uint8_t b) {
- // Write color to frame buffer
- for (uint8_t bit = 0; bit < 8; bit++) {
- ws2812_frame_buffer[WS2812_RED_BIT(led_number, bit)] = ((r >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
- ws2812_frame_buffer[WS2812_GREEN_BIT(led_number, bit)] = ((g >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
- ws2812_frame_buffer[WS2812_BLUE_BIT(led_number, bit)] = ((b >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
- }
- }
- void ws2812_write_led_rgbw(uint16_t led_number, uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
- // Write color to frame buffer
- for (uint8_t bit = 0; bit < 8; bit++) {
- ws2812_frame_buffer[WS2812_RED_BIT(led_number, bit)] = ((r >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
- ws2812_frame_buffer[WS2812_GREEN_BIT(led_number, bit)] = ((g >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
- ws2812_frame_buffer[WS2812_BLUE_BIT(led_number, bit)] = ((b >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
- #ifdef RGBW
- ws2812_frame_buffer[WS2812_WHITE_BIT(led_number, bit)] = ((w >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
- #endif
- }
- }
-
- // Setleds for standard RGB
- void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
- static bool s_init = false;
- if (!s_init) {
- ws2812_init();
- s_init = true;
- }
-
- for (uint16_t i = 0; i < leds; i++) {
- #ifdef RGBW
- ws2812_write_led_rgbw(i, ledarray[i].r, ledarray[i].g, ledarray[i].b, ledarray[i].w);
- #else
- ws2812_write_led(i, ledarray[i].r, ledarray[i].g, ledarray[i].b);
- #endif
- }
- }
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