src/main/drivers/light_ws2811strip_stm32f10x.c

   1 /*
   2  * This file is part of Cleanflight.
   3  *
   4  * Cleanflight is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * Cleanflight is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdbool.h>
  19 #include <stdint.h>
  20
  21 #include "platform.h"
  22
  23 #include "common/color.h"
  24 #include "drivers/light_ws2811strip.h"
  25 #include "nvic.h"
  26
  27 void ws2811LedStripHardwareInit(void)
  28 {
  29     TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  30     TIM_OCInitTypeDef  TIM_OCInitStructure;
  31     GPIO_InitTypeDef GPIO_InitStructure;
  32     DMA_InitTypeDef DMA_InitStructure;
  33
  34     uint16_t prescalerValue;
  35
  36 #ifdef CC3D
  37     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  38     GPIO_StructInit(&GPIO_InitStructure);
  39     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  40     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  41     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  42     GPIO_Init(GPIOB, &GPIO_InitStructure);
  43 #else
  44     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  45
  46     /* GPIOA Configuration: TIM3 Channel 1 as alternate function push-pull */
  47     GPIO_StructInit(&GPIO_InitStructure);
  48     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  49     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  50     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  51     GPIO_Init(GPIOA, &GPIO_InitStructure);
  52 #endif
  53
  54     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  55     /* Compute the prescaler value */
  56     prescalerValue = (uint16_t) (SystemCoreClock / 24000000) - 1;
  57     /* Time base configuration */
  58     TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  59     TIM_TimeBaseStructure.TIM_Period = 29; // 800kHz
  60     TIM_TimeBaseStructure.TIM_Prescaler = prescalerValue;
  61     TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  62     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  63     TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
  64
  65     /* PWM1 Mode configuration: Channel1 */
  66     TIM_OCStructInit(&TIM_OCInitStructure);
  67     TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  68     TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  69     TIM_OCInitStructure.TIM_Pulse = 0;
  70     TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  71     TIM_OC1Init(TIM3, &TIM_OCInitStructure);
  72     TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
  73
  74     TIM_CtrlPWMOutputs(TIM3, ENABLE);
  75
  76     /* configure DMA */
  77     /* DMA clock enable */
  78     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
  79
  80     /* DMA1 Channel6 Config */
  81     DMA_DeInit(DMA1_Channel6);
  82
  83     DMA_StructInit(&DMA_InitStructure);
  84     DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&TIM3->CCR1;
  85     DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ledStripDMABuffer;
  86     DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  87     DMA_InitStructure.DMA_BufferSize = WS2811_DMA_BUFFER_SIZE;
  88     DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  89     DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  90     DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  91     DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  92     DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  93     DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  94     DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  95
  96     DMA_Init(DMA1_Channel6, &DMA_InitStructure);
  97
  98     /* TIM3 CC1 DMA Request enable */
  99     TIM_DMACmd(TIM3, TIM_DMA_CC1, ENABLE);
 100
 101     DMA_ITConfig(DMA1_Channel6, DMA_IT_TC, ENABLE);
 102
 103     NVIC_InitTypeDef NVIC_InitStructure;
 104
 105     NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;
 106     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVIC_PRIORITY_BASE(NVIC_PRIO_WS2811_DMA);
 107     NVIC_InitStructure.NVIC_IRQChannelSubPriority = NVIC_PRIORITY_SUB(NVIC_PRIO_WS2811_DMA);
 108     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 109     NVIC_Init(&NVIC_InitStructure);
 110
 111     setStripColor(&hsv_white);
 112     ws2811UpdateStrip();
 113 }
 114
 115 void DMA1_Channel6_IRQHandler(void)
 116 {
 117     if (DMA_GetFlagStatus(DMA1_FLAG_TC6)) {
 118         ws2811LedDataTransferInProgress = 0;
 119         DMA_Cmd(DMA1_Channel6, DISABLE);            // disable DMA channel 6
 120         DMA_ClearFlag(DMA1_FLAG_TC6);               // clear DMA1 Channel 6 transfer complete flag
 121     }
 122 }
 123
 124 void ws2811LedStripDMAEnable(void)
 125 {
 126     DMA_SetCurrDataCounter(DMA1_Channel6, WS2811_DMA_BUFFER_SIZE);  // load number of bytes to be transferred
 127     TIM_SetCounter(TIM3, 0);
 128     TIM_Cmd(TIM3, ENABLE);
 129     DMA_Cmd(DMA1_Channel6, ENABLE);
 130 }
 131
 132