mirror of
https://github.com/betaflight/betaflight.git
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133 lines
4.4 KiB
C
133 lines
4.4 KiB
C
/*
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* This file is part of Cleanflight.
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*
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* Cleanflight 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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* Cleanflight 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 Cleanflight. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <platform.h>
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#ifdef LED_STRIP
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#include "common/color.h"
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#include "light_ws2811strip.h"
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#include "nvic.h"
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#include "io.h"
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#include "dma.h"
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#include "rcc.h"
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#include "timer.h"
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static IO_t ws2811IO = IO_NONE;
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bool ws2811Initialised = false;
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static DMA_Channel_TypeDef *dmaChannel = NULL;
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static TIM_TypeDef *timer = NULL;
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static void WS2811_DMA_IRQHandler(dmaChannelDescriptor_t *descriptor)
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{
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if (DMA_GET_FLAG_STATUS(descriptor, DMA_IT_TCIF)) {
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ws2811LedDataTransferInProgress = 0;
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DMA_Cmd(descriptor->channel, DISABLE);
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DMA_CLEAR_FLAG(descriptor, DMA_IT_TCIF);
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}
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}
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void ws2811LedStripHardwareInit(ioTag_t ioTag)
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{
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if (!ioTag) {
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return;
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}
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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TIM_OCInitTypeDef TIM_OCInitStructure;
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DMA_InitTypeDef DMA_InitStructure;
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const timerHardware_t *timerHardware = timerGetByTag(ioTag, TIM_USE_ANY);
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timer = timerHardware->tim;
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if (timerHardware->dmaChannel == NULL) {
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return;
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}
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ws2811IO = IOGetByTag(ioTag);
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IOInit(ws2811IO, OWNER_LED_STRIP, RESOURCE_OUTPUT, 0);
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IOConfigGPIO(ws2811IO, IO_CONFIG(GPIO_Speed_50MHz, GPIO_Mode_AF_PP));
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RCC_ClockCmd(timerRCC(timer), ENABLE);
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/* Compute the prescaler value */
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uint16_t prescalerValue = (uint16_t) (SystemCoreClock / WS2811_TIMER_HZ) - 1;
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/* Time base configuration */
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TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
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TIM_TimeBaseStructure.TIM_Period = WS2811_TIMER_PERIOD; // 800kHz
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TIM_TimeBaseStructure.TIM_Prescaler = prescalerValue;
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(timer, &TIM_TimeBaseStructure);
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/* PWM1 Mode configuration: Channel1 */
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TIM_OCStructInit(&TIM_OCInitStructure);
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TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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TIM_OCInitStructure.TIM_Pulse = 0;
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TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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TIM_OC1Init(timer, &TIM_OCInitStructure);
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TIM_OC1PreloadConfig(timer, TIM_OCPreload_Enable);
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TIM_CtrlPWMOutputs(timer, ENABLE);
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/* configure DMA */
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/* DMA1 Channel6 Config */
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dmaChannel = timerHardware->dmaChannel;
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DMA_DeInit(dmaChannel);
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DMA_StructInit(&DMA_InitStructure);
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DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)timerCCR(timer, timerHardware->channel);
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DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ledStripDMABuffer;
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DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
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DMA_InitStructure.DMA_BufferSize = WS2811_DMA_BUFFER_SIZE;
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
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DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
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DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
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DMA_Init(dmaChannel, &DMA_InitStructure);
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/* TIM3 CC1 DMA Request enable */
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TIM_DMACmd(timer, timerDmaSource(timerHardware->channel), ENABLE);
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DMA_ITConfig(dmaChannel, DMA_IT_TC, ENABLE);
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dmaInit(timerHardware->dmaIrqHandler, OWNER_LED_STRIP, 0);
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dmaSetHandler(timerHardware->dmaIrqHandler, WS2811_DMA_IRQHandler, NVIC_PRIO_WS2811_DMA, 0);
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ws2811Initialised = true;
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}
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void ws2811LedStripDMAEnable(void)
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{
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if (!ws2811Initialised)
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return;
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DMA_SetCurrDataCounter(dmaChannel, WS2811_DMA_BUFFER_SIZE); // load number of bytes to be transferred
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TIM_SetCounter(timer, 0);
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TIM_Cmd(timer, ENABLE);
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DMA_Cmd(dmaChannel, ENABLE);
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}
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#endif
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