72 lines
3.3 KiB
C
72 lines
3.3 KiB
C
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to drive a WS2812B LED chain (API)
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* @file led_ws2812b.h
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016
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* @note peripherals used: SPI @ref led_ws2812b_spi, timer @ref led_ws2812b_timer, DMA @ref led_ws2812b_dma
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*/
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#pragma once
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/** number of LEDs on the WS2812B strip */
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#define LED_WS2812B_LEDS 48
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/** peripheral configuration */
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/** @defgroup led_ws2812b_spi SPI peripheral used to control the WS2812B LEDs
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* @{
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*/
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#define LED_WS2812B_SPI SPI1 /**< SPI peripheral */
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#define LED_WS2812B_SPI_DR SPI1_DR /**< SPI data register for the DMA */
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#define LED_WS2812B_SPI_RCC RCC_SPI1 /**< SPI peripheral clock */
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#define LED_WS2812B_SPI_PORT_RCC RCC_GPIOA /**< SPI I/O peripheral clock */
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#define LED_WS2812B_SPI_PORT GPIOA /**< SPI port */
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#define LED_WS2812B_SPI_CLK GPIO_SPI1_SCK /**< SPI clock pin (PA5), connect to PWM output */
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#define LED_WS2812B_SPI_DOUT GPIO_SPI1_MISO /**< SPI data pin (PA6), connect to WS2812B DIN */
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/** @} */
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/** @defgroup led_ws2812b_timer timer peripheral used to generate SPI clock
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* @{
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*/
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#define LED_WS2812B_TIMER TIM3 /**< timer peripheral */
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#define LED_WS2812B_TIMER_RCC RCC_TIM3 /**< timer peripheral clock */
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#define LED_WS2812B_TIMER_OC TIM_OC3 /**< timer output compare used to set PWM frequency */
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#define LED_WS2812B_CLK_RCC RCC_GPIOB /**< timer port peripheral clock */
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#define LED_WS2812B_CLK_PORT GPIOB /**< timer port */
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#define LED_WS2812B_CLK_PIN GPIO_TIM3_CH3 /**< timer pin to output PWM (PB0), connect to SPI clock input */
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/** @} */
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/** @defgroup led_ws2812b_dma DMA peripheral used to send the data
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* @{
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*/
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#define LED_WS2812B_DMA DMA1 /**< DMA peripheral to put data for WS2812B LED in SPI queue (only DMA1 supports SPI1_TX interrupt) */
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#define LED_WS2812B_DMA_RCC RCC_DMA1 /**< DMA peripheral clock */
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#define LED_WS2812B_DMA_CH DMA_CHANNEL3 /**< DMA channel (only DMA1 channel 3 supports SPI1_TX interrupt) */
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#define LED_WS2812B_DMA_IRQ NVIC_DMA1_CHANNEL3_IRQ /**< DMA channel interrupt signal */
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#define LED_WS2812B_DMA_ISR dma1_channel3_isr /**< DMA channel interrupt service routine */
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/** @} */
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/** setup WS2812B LED driver */
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void led_ws2812b_setup(void);
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/** set color of a single LED
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* @param[in] led the LED number to set the color
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* @param[in] red the red color value to set on the LED
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* @param[in] green the green color value to set on the LED
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* @param[in] blue the blue color value to set on the LED
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* @note transmission needs to be done separately
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*/
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void led_ws2812b_set_rgb(uint16_t led, uint8_t red, uint8_t green, uint8_t blue);
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/** transmit color values to WS2812B LEDs
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* @return true if transmission started, false if another transmission is already ongoing
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*/
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bool led_ws2812b_transmit(void);
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