adds ws2812 driver for arm
Jack Humbert
7 years ago
parent
91efe74365
commit
ddee61c9ba
@ -0,0 +1,556 @@
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/*
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WS2812B CPU and memory efficient library
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Date: 28.9.2016
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Author: Martin Hubacek
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http://www.martinhubacek.cz
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@hubmartin
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Licence: MIT License
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*/
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#include <string.h>
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#include "stm32f3xx_hal.h"
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#include "ws2812.h"
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extern WS2812_Struct ws2812b;
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// Define source arrays for my DMAs
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uint32_t WS2812_IO_High[] = { WS2812B_PINS };
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uint32_t WS2812_IO_Low[] = {WS2812B_PINS << 16};
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// WS2812 framebuffer - buffer for 2 LEDs - two times 24 bits
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uint16_t ws2812bDmaBitBuffer[24 * 2];
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// Gamma correction table
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const uint8_t gammaTable[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
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2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
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5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
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10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
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17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
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25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
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37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
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51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
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69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
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90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
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115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
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144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
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177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
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215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
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static void ws2812b_gpio_init(void)
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{
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// WS2812B outputs
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WS2812B_GPIO_CLK_ENABLE();
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GPIO_InitTypeDef GPIO_InitStruct;
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GPIO_InitStruct.Pin = WS2812B_PINS;
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GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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HAL_GPIO_Init(WS2812B_PORT, &GPIO_InitStruct);
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// Enable output pins for debuging to see DMA Full and Half transfer interrupts
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#if defined(LED4_PORT) && defined(LED5_PORT)
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GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
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GPIO_InitStruct.Pin = LED4_PIN;
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HAL_GPIO_Init(LED4_PORT, &GPIO_InitStruct);
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GPIO_InitStruct.Pin = LED5_PIN;
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HAL_GPIO_Init(LED5_PORT, &GPIO_InitStruct);
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#endif
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}
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TIM_HandleTypeDef Tim2Handle;
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TIM_OC_InitTypeDef tim2OC1;
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TIM_OC_InitTypeDef tim2OC2;
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uint32_t tim_period;
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static void TIM2_init(void)
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{
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// TIM2 Periph clock enable
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__HAL_RCC_TIM2_CLK_ENABLE();
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// This computation of pulse length should work ok,
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// at some slower core speeds it needs some tuning.
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tim_period = SystemCoreClock / 800000; // 0,125us period (10 times lower the 1,25us period to have fixed math below)
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uint32_t cc1 = (10 * tim_period) / 36;
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uint32_t cc2 = (10 * tim_period) / 15;
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Tim2Handle.Instance = TIM2;
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Tim2Handle.Init.Period = tim_period;
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Tim2Handle.Init.RepetitionCounter = 0;
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Tim2Handle.Init.Prescaler = 0;
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Tim2Handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
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Tim2Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
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HAL_TIM_PWM_Init(&Tim2Handle);
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HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0);
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HAL_NVIC_EnableIRQ(TIM2_IRQn);
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tim2OC1.OCMode = TIM_OCMODE_PWM1;
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tim2OC1.OCPolarity = TIM_OCPOLARITY_HIGH;
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tim2OC1.Pulse = cc1;
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tim2OC1.OCNPolarity = TIM_OCNPOLARITY_HIGH;
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tim2OC1.OCFastMode = TIM_OCFAST_DISABLE;
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HAL_TIM_PWM_ConfigChannel(&Tim2Handle, &tim2OC1, TIM_CHANNEL_1);
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tim2OC2.OCMode = TIM_OCMODE_PWM1;
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tim2OC2.OCPolarity = TIM_OCPOLARITY_HIGH;
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tim2OC2.Pulse = cc2;
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tim2OC2.OCNPolarity = TIM_OCNPOLARITY_HIGH;
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tim2OC2.OCFastMode = TIM_OCFAST_DISABLE;
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tim2OC2.OCIdleState = TIM_OCIDLESTATE_RESET;
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tim2OC2.OCNIdleState = TIM_OCNIDLESTATE_RESET;
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HAL_TIM_PWM_ConfigChannel(&Tim2Handle, &tim2OC2, TIM_CHANNEL_2);
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HAL_TIM_Base_Start(&Tim2Handle);
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HAL_TIM_PWM_Start(&Tim2Handle, TIM_CHANNEL_1);
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}
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DMA_HandleTypeDef dmaUpdate;
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DMA_HandleTypeDef dmaCC1;
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DMA_HandleTypeDef dmaCC2;
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#define BUFFER_SIZE (sizeof(ws2812bDmaBitBuffer)/sizeof(uint16_t))
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static void DMA_init(void)
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{
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// TIM2 Update event
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__HAL_RCC_DMA1_CLK_ENABLE();
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dmaUpdate.Init.Direction = DMA_MEMORY_TO_PERIPH;
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dmaUpdate.Init.PeriphInc = DMA_PINC_DISABLE;
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dmaUpdate.Init.MemInc = DMA_MINC_DISABLE;
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dmaUpdate.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
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dmaUpdate.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
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dmaUpdate.Init.Mode = DMA_CIRCULAR;
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dmaUpdate.Init.Priority = DMA_PRIORITY_VERY_HIGH;
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dmaUpdate.Instance = DMA1_Channel2;
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//dmaUpdate.XferCpltCallback = TransferComplete;
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//dmaUpdate.XferErrorCallback = TransferError;
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HAL_DMA_Init(&dmaUpdate);
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//HAL_NVIC_SetPriority(DMA1_Channel2_IRQn, 0, 0);
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//HAL_NVIC_EnableIRQ(DMA1_Channel2_IRQn);
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HAL_DMA_Start(&dmaUpdate, (uint32_t)WS2812_IO_High, (uint32_t)&WS2812B_PORT->BSRR, BUFFER_SIZE);
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// TIM2 CC1 event
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dmaCC1.Init.Direction = DMA_MEMORY_TO_PERIPH;
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dmaCC1.Init.PeriphInc = DMA_PINC_DISABLE;
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dmaCC1.Init.MemInc = DMA_MINC_ENABLE;
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dmaCC1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
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dmaCC1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
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dmaCC1.Init.Mode = DMA_CIRCULAR;
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dmaCC1.Init.Priority = DMA_PRIORITY_VERY_HIGH;
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dmaCC1.Instance = DMA1_Channel5;
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//dmaUpdate.XferCpltCallback = TransferComplete;
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//dmaUpdate.XferErrorCallback = TransferError;
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//dmaUpdate.XferHalfCpltCallback = TransferHalf;
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//HAL_NVIC_SetPriority(DMA1_Channel5_IRQn, 0, 0);
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//HAL_NVIC_EnableIRQ(DMA1_Channel5_IRQn);
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HAL_DMA_Init(&dmaCC1);
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HAL_DMA_Start(&dmaCC1, (uint32_t)ws2812bDmaBitBuffer, (uint32_t)&WS2812B_PORT->BRR, BUFFER_SIZE);
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// TIM2 CC2 event
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dmaCC2.Init.Direction = DMA_MEMORY_TO_PERIPH;
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dmaCC2.Init.PeriphInc = DMA_PINC_DISABLE;
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dmaCC2.Init.MemInc = DMA_MINC_DISABLE;
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dmaCC2.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
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dmaCC2.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
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dmaCC2.Init.Mode = DMA_CIRCULAR;
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dmaCC2.Init.Priority = DMA_PRIORITY_VERY_HIGH;
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dmaCC2.Instance = DMA1_Channel7;
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dmaCC2.XferCpltCallback = DMA_TransferCompleteHandler;
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dmaCC2.XferHalfCpltCallback = DMA_TransferHalfHandler;
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//dmaUpdate.XferErrorCallback = TransferError;
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HAL_DMA_Init(&dmaCC2);
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HAL_NVIC_SetPriority(DMA1_Channel7_IRQn, 0, 0);
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HAL_NVIC_EnableIRQ(DMA1_Channel7_IRQn);
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HAL_DMA_Start_IT(&dmaCC2, (uint32_t)WS2812_IO_Low, (uint32_t)&WS2812B_PORT->BSRR, BUFFER_SIZE);
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}
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/*
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void DMA1_Channel2_IRQHandler(void)
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{
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// Check the interrupt and clear flag
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HAL_DMA_IRQHandler(&dmaUpdate);
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}
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void DMA1_Channel5_IRQHandler(void)
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{
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// Check the interrupt and clear flag
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HAL_DMA_IRQHandler(&dmaCC1);
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}*/
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void DMA1_Channel7_IRQHandler(void)
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{
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// Check the interrupt and clear flag
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HAL_DMA_IRQHandler(&dmaCC2);
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}
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static void loadNextFramebufferData(WS2812_BufferItem *bItem, uint32_t row)
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{
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uint32_t r = bItem->frameBufferPointer[bItem->frameBufferCounter++];
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uint32_t g = bItem->frameBufferPointer[bItem->frameBufferCounter++];
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uint32_t b = bItem->frameBufferPointer[bItem->frameBufferCounter++];
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if(bItem->frameBufferCounter == bItem->frameBufferSize)
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bItem->frameBufferCounter = 0;
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ws2812b_set_pixel(bItem->channel, row, r, g, b);
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}
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// Transmit the framebuffer
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static void WS2812_sendbuf()
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{
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// transmission complete flag
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ws2812b.transferComplete = 0;
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uint32_t i;
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for( i = 0; i < WS2812_BUFFER_COUNT; i++ )
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{
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ws2812b.item[i].frameBufferCounter = 0;
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loadNextFramebufferData(&ws2812b.item[i], 0); // ROW 0
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loadNextFramebufferData(&ws2812b.item[i], 1); // ROW 0
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}
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// clear all DMA flags
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__HAL_DMA_CLEAR_FLAG(&dmaUpdate, DMA_FLAG_TC2 | DMA_FLAG_HT2 | DMA_FLAG_TE2);
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__HAL_DMA_CLEAR_FLAG(&dmaCC1, DMA_FLAG_TC5 | DMA_FLAG_HT5 | DMA_FLAG_TE5);
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__HAL_DMA_CLEAR_FLAG(&dmaCC2, DMA_FLAG_TC7 | DMA_FLAG_HT7 | DMA_FLAG_TE7);
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// configure the number of bytes to be transferred by the DMA controller
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dmaUpdate.Instance->CNDTR = BUFFER_SIZE;
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dmaCC1.Instance->CNDTR = BUFFER_SIZE;
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dmaCC2.Instance->CNDTR = BUFFER_SIZE;
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// clear all TIM2 flags
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__HAL_TIM_CLEAR_FLAG(&Tim2Handle, TIM_FLAG_UPDATE | TIM_FLAG_CC1 | TIM_FLAG_CC2 | TIM_FLAG_CC3 | TIM_FLAG_CC4);
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// enable DMA channels
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__HAL_DMA_ENABLE(&dmaUpdate);
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__HAL_DMA_ENABLE(&dmaCC1);
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__HAL_DMA_ENABLE(&dmaCC2);
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// IMPORTANT: enable the TIM2 DMA requests AFTER enabling the DMA channels!
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__HAL_TIM_ENABLE_DMA(&Tim2Handle, TIM_DMA_UPDATE);
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__HAL_TIM_ENABLE_DMA(&Tim2Handle, TIM_DMA_CC1);
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__HAL_TIM_ENABLE_DMA(&Tim2Handle, TIM_DMA_CC2);
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TIM2->CNT = tim_period-1;
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// start TIM2
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__HAL_TIM_ENABLE(&Tim2Handle);
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}
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void DMA_TransferHalfHandler(DMA_HandleTypeDef *DmaHandle)
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{
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#if defined(LED4_PORT)
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LED4_PORT->BSRR = LED4_PIN;
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#endif
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// Is this the last LED?
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if(ws2812b.repeatCounter != (WS2812B_NUMBER_OF_LEDS / 2 - 1))
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{
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uint32_t i;
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for( i = 0; i < WS2812_BUFFER_COUNT; i++ )
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{
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loadNextFramebufferData(&ws2812b.item[i], 0);
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}
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} else {
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// If this is the last pixel, set the next pixel value to zeros, because
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// the DMA would not stop exactly at the last bit.
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ws2812b_set_pixel(0, 0, 0, 0, 0);
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}
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#if defined(LED4_PORT)
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LED4_PORT->BRR = LED4_PIN;
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#endif
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}
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void DMA_TransferCompleteHandler(DMA_HandleTypeDef *DmaHandle)
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{
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#if defined(LED5_PORT)
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LED5_PORT->BSRR = LED5_PIN;
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#endif
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ws2812b.repeatCounter++;
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if(ws2812b.repeatCounter == WS2812B_NUMBER_OF_LEDS / 2)
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{
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// Transfer of all LEDs is done, disable DMA but enable tiemr update IRQ to stop the 50us pulse
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ws2812b.repeatCounter = 0;
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// Enable TIM2 Update interrupt for 50us Treset signal
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__HAL_TIM_ENABLE_IT(&Tim2Handle, TIM_IT_UPDATE);
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// Disable DMA
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__HAL_DMA_DISABLE(&dmaUpdate);
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__HAL_DMA_DISABLE(&dmaCC1);
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__HAL_DMA_DISABLE(&dmaCC2);
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// Disable the DMA requests
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__HAL_TIM_DISABLE_DMA(&Tim2Handle, TIM_DMA_UPDATE);
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__HAL_TIM_DISABLE_DMA(&Tim2Handle, TIM_DMA_CC1);
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__HAL_TIM_DISABLE_DMA(&Tim2Handle, TIM_DMA_CC2);
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// Manually set outputs to low to generate 50us reset impulse
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WS2812B_PORT->BSRR = WS2812_IO_Low[0];
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} else {
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// Load bitbuffer with next RGB LED values
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uint32_t i;
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for( i = 0; i < WS2812_BUFFER_COUNT; i++ )
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{
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loadNextFramebufferData(&ws2812b.item[i], 1);
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}
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}
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#if defined(LED5_PORT)
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LED5_PORT->BRR = LED5_PIN;
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#endif
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}
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void TIM2_IRQHandler(void)
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{
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HAL_TIM_IRQHandler(&Tim2Handle);
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}
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// TIM2 Interrupt Handler gets executed on every TIM2 Update if enabled
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void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
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{
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// I have to wait 50us to generate Treset signal
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if (ws2812b.timerPeriodCounter < (uint8_t)WS2812_RESET_PERIOD)
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{
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// count the number of timer periods
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ws2812b.timerPeriodCounter++;
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}
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else
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{
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ws2812b.timerPeriodCounter = 0;
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__HAL_TIM_DISABLE(&Tim2Handle);
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TIM2->CR1 = 0; // disable timer
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// disable the TIM2 Update
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__HAL_TIM_DISABLE_IT(&Tim2Handle, TIM_IT_UPDATE);
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// set TransferComplete flag
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ws2812b.transferComplete = 1;
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}
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}
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static void ws2812b_set_pixel(uint8_t row, uint16_t column, uint8_t red, uint8_t green, uint8_t blue)
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{
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// Apply gamma
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red = gammaTable[red];
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green = gammaTable[green];
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blue = gammaTable[blue];
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uint32_t calcCol = (column*24);
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uint32_t invRed = ~red;
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uint32_t invGreen = ~green;
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uint32_t invBlue = ~blue;
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#if defined(SETPIX_1)
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uint8_t i;
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uint32_t calcClearRow = ~(0x01<<row);
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for (i = 0; i < 8; i++)
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{
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// clear the data for pixel
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ws2812bDmaBitBuffer[(calcCol+i)] &= calcClearRow;
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ws2812bDmaBitBuffer[(calcCol+8+i)] &= calcClearRow;
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ws2812bDmaBitBuffer[(calcCol+16+i)] &= calcClearRow;
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// write new data for pixel
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ws2812bDmaBitBuffer[(calcCol+i)] |= (((((invGreen)<<i) & 0x80)>>7)<<row);
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ws2812bDmaBitBuffer[(calcCol+8+i)] |= (((((invRed)<<i) & 0x80)>>7)<<row);
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ws2812bDmaBitBuffer[(calcCol+16+i)] |= (((((invBlue)<<i) & 0x80)>>7)<<row);
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}
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#elif defined(SETPIX_2)
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uint8_t i;
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for (i = 0; i < 8; i++)
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{
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// Set or clear the data for the pixel
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if(((invGreen)<<i) & 0x80)
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varSetBit(ws2812bDmaBitBuffer[(calcCol+i)], row);
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else
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varResetBit(ws2812bDmaBitBuffer[(calcCol+i)], row);
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if(((invRed)<<i) & 0x80)
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varSetBit(ws2812bDmaBitBuffer[(calcCol+8+i)], row);
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else
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varResetBit(ws2812bDmaBitBuffer[(calcCol+8+i)], row);
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if(((invBlue)<<i) & 0x80)
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varSetBit(ws2812bDmaBitBuffer[(calcCol+16+i)], row);
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else
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varResetBit(ws2812bDmaBitBuffer[(calcCol+16+i)], row);
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}
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#elif defined(SETPIX_3)
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ws2812bDmaBitBuffer[(calcCol+0)] |= (((((invGreen)<<0) & 0x80)>>7)<<row);
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ws2812bDmaBitBuffer[(calcCol+8+0)] |= (((((invRed)<<0) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+0)] |= (((((invBlue)<<0) & 0x80)>>7)<<row);
|
||||
|
||||
ws2812bDmaBitBuffer[(calcCol+1)] |= (((((invGreen)<<1) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+8+1)] |= (((((invRed)<<1) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+1)] |= (((((invBlue)<<1) & 0x80)>>7)<<row);
|
||||
|
||||
ws2812bDmaBitBuffer[(calcCol+2)] |= (((((invGreen)<<2) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+8+2)] |= (((((invRed)<<2) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+2)] |= (((((invBlue)<<2) & 0x80)>>7)<<row);
|
||||
|
||||
ws2812bDmaBitBuffer[(calcCol+3)] |= (((((invGreen)<<3) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+8+3)] |= (((((invRed)<<3) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+3)] |= (((((invBlue)<<3) & 0x80)>>7)<<row);
|
||||
|
||||
ws2812bDmaBitBuffer[(calcCol+4)] |= (((((invGreen)<<4) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+8+4)] |= (((((invRed)<<4) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+4)] |= (((((invBlue)<<4) & 0x80)>>7)<<row);
|
||||
|
||||
ws2812bDmaBitBuffer[(calcCol+5)] |= (((((invGreen)<<5) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+8+5)] |= (((((invRed)<<5) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+5)] |= (((((invBlue)<<5) & 0x80)>>7)<<row);
|
||||
|
||||
ws2812bDmaBitBuffer[(calcCol+6)] |= (((((invGreen)<<6) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+8+6)] |= (((((invRed)<<6) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+6)] |= (((((invBlue)<<6) & 0x80)>>7)<<row);
|
||||
|
||||
ws2812bDmaBitBuffer[(calcCol+7)] |= (((((invGreen)<<7) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+8+7)] |= (((((invRed)<<7) & 0x80)>>7)<<row);
|
||||
ws2812bDmaBitBuffer[(calcCol+16+7)] |= (((((invBlue)<<7) & 0x80)>>7)<<row);
|
||||
#elif defined(SETPIX_4)
|
||||
|
||||
// Bitband optimizations with pure increments, 5us interrupts
|
||||
uint32_t *bitBand = BITBAND_SRAM(&ws2812bDmaBitBuffer[(calcCol)], row);
|
||||
|
||||
*bitBand = (invGreen >> 7);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invGreen >> 6);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invGreen >> 5);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invGreen >> 4);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invGreen >> 3);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invGreen >> 2);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invGreen >> 1);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invGreen >> 0);
|
||||
bitBand+=16;
|
||||
|
||||
// RED
|
||||
*bitBand = (invRed >> 7);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invRed >> 6);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invRed >> 5);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invRed >> 4);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invRed >> 3);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invRed >> 2);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invRed >> 1);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invRed >> 0);
|
||||
bitBand+=16;
|
||||
|
||||
// BLUE
|
||||
*bitBand = (invBlue >> 7);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invBlue >> 6);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invBlue >> 5);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invBlue >> 4);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invBlue >> 3);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invBlue >> 2);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invBlue >> 1);
|
||||
bitBand+=16;
|
||||
|
||||
*bitBand = (invBlue >> 0);
|
||||
bitBand+=16;
|
||||
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
void ws2812b_init()
|
||||
{
|
||||
ws2812b_gpio_init();
|
||||
DMA_init();
|
||||
TIM2_init();
|
||||
|
||||
// Need to start the first transfer
|
||||
ws2812b.transferComplete = 1;
|
||||
}
|
||||
|
||||
|
||||
void ws2812b_handle()
|
||||
{
|
||||
if(ws2812b.startTransfer) {
|
||||
ws2812b.startTransfer = 0;
|
||||
WS2812_sendbuf();
|
||||
}
|
||||
|
||||
}
|
||||
@ -0,0 +1,94 @@
|
||||
/*
|
||||
|
||||
WS2812B CPU and memory efficient library
|
||||
|
||||
Date: 28.9.2016
|
||||
|
||||
Author: Martin Hubacek
|
||||
http://www.martinhubacek.cz
|
||||
@hubmartin
|
||||
|
||||
Licence: MIT License
|
||||
|
||||
*/
|
||||
|
||||
#ifndef WS2812B_H_
|
||||
#define WS2812B_H_
|
||||
#include "ws2812.h"
|
||||
|
||||
// GPIO enable command
|
||||
#define WS2812B_GPIO_CLK_ENABLE() __HAL_RCC_GPIOC_CLK_ENABLE()
|
||||
// LED output port
|
||||
#define WS2812B_PORT GPIOC
|
||||
// LED output pins
|
||||
#define WS2812B_PINS (GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3)
|
||||
// How many LEDs are in the series
|
||||
#define WS2812B_NUMBER_OF_LEDS 60
|
||||
|
||||
// Number of output LED strips. Each has its own buffer.
|
||||
#define WS2812_BUFFER_COUNT 2
|
||||
|
||||
// Choose one of the bit-juggling setpixel implementation
|
||||
// *******************************************************
|
||||
//#define SETPIX_1 // For loop, works everywhere, slow
|
||||
//#define SETPIX_2 // Bit band in a loop
|
||||
//#define SETPIX_3 // Like SETPIX_1 but with unrolled loop
|
||||
#define SETPIX_4 // Fastest copying using bit-banding
|
||||
|
||||
|
||||
// DEBUG OUTPUT
|
||||
// ********************
|
||||
#define LED4_PORT GPIOC
|
||||
#define LED4_PIN GPIO_PIN_10
|
||||
|
||||
#define LED5_PORT GPIOC
|
||||
#define LED5_PIN GPIO_PIN_10
|
||||
|
||||
|
||||
// Public functions
|
||||
// ****************
|
||||
void ws2812b_init();
|
||||
void ws2812b_handle();
|
||||
|
||||
// Library structures
|
||||
// ******************
|
||||
// This value sets number of periods to generate 50uS Treset signal
|
||||
#define WS2812_RESET_PERIOD 12
|
||||
|
||||
typedef struct WS2812_BufferItem {
|
||||
uint8_t* frameBufferPointer;
|
||||
uint32_t frameBufferSize;
|
||||
uint32_t frameBufferCounter;
|
||||
uint8_t channel; // digital output pin/channel
|
||||
} WS2812_BufferItem;
|
||||
|
||||
|
||||
|
||||
typedef struct WS2812_Struct
|
||||
{
|
||||
WS2812_BufferItem item[WS2812_BUFFER_COUNT];
|
||||
uint8_t transferComplete;
|
||||
uint8_t startTransfer;
|
||||
uint32_t timerPeriodCounter;
|
||||
uint32_t repeatCounter;
|
||||
} WS2812_Struct;
|
||||
|
||||
WS2812_Struct ws2812b;
|
||||
|
||||
// Bit band stuff
|
||||
#define RAM_BASE 0x20000000
|
||||
#define RAM_BB_BASE 0x22000000
|
||||
#define Var_ResetBit_BB(VarAddr, BitNumber) (*(volatile uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 0)
|
||||
#define Var_SetBit_BB(VarAddr, BitNumber) (*(volatile uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 1)
|
||||
#define Var_GetBit_BB(VarAddr, BitNumber) (*(volatile uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)))
|
||||
#define BITBAND_SRAM(address, bit) ( (__IO uint32_t *) (RAM_BB_BASE + (((uint32_t)address) - RAM_BASE) * 32 + (bit) * 4))
|
||||
|
||||
#define varSetBit(var,bit) (Var_SetBit_BB((uint32_t)&var,bit))
|
||||
#define varResetBit(var,bit) (Var_ResetBit_BB((uint32_t)&var,bit))
|
||||
#define varGetBit(var,bit) (Var_GetBit_BB((uint32_t)&var,bit))
|
||||
|
||||
static void ws2812b_set_pixel(uint8_t row, uint16_t column, uint8_t red, uint8_t green, uint8_t blue);
|
||||
void DMA_TransferCompleteHandler(DMA_HandleTypeDef *DmaHandle);
|
||||
void DMA_TransferHalfHandler(DMA_HandleTypeDef *DmaHandle);
|
||||
|
||||
#endif /* WS2812B_H_ */
|
||||
Loading…
Reference in New Issue