最近在玩WS2812，一直驅動不起來。我用的單片機是F103, ，然后使用的引腳是PB0, 寫得代碼一直輸出不了DMA，希望各位幫忙看一下，哪里配置錯了。
目前的情況就是PWM能夠輸出800khz，想要通過不同的脈沖周期輸出不一樣的占空比。例如圖片處。附上代碼。- //頭文件
- #include "stm32f10x.h"
- #include "GPIOLIKE51.h"
- #include "stm32f10x_dma.h"
- #include "stm32f10x_tim.h"
- #define BUFFER_SIZE 10
- int j,z;
- int iii,jjj;
- uint32_t pwm_buffer[BUFFER_SIZE] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90};
- //函數聲明
- void GPIO_Configuration(void);
- void xintiao(void);
- //=============================================================================
- //文件名稱：Delay
- //功能概要：延時
- //參數說明：nCount：延時長短
- //函數返回：無
- //=============================================================================
- void TIM3_PWM_Configuration(unsigned int freq, uint8_t duty_cycle);
- void DMA_Configuration(uint32_t pwmBuffer1);
- void SendData(void);
- void Delay(uint32_t nCount)
- {
- for(; nCount != 0; nCount--);
- }
- //=============================================================================
- //文件名稱：main
- //功能概要：主函數
- //參數說明：無
- //函數返回：int
- //=============================================================================
- int main(void)
- {
- GPIO_Configuration();
- // 配置TIM2通道2為PWM模式，頻率為800kHz
- TIM3_PWM_Configuration(800000, 50);
- DMA_Configuration(*pwm_buffer);
- while (1)
- {
- ;
- }
- }
- //=============================================================================
- //文件名稱：GPIO_Configuration
- //功能概要：GPIO初始化
- //參數說明：無
- //函數返回：無
- //=============================================================================
- void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
-
- RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC , ENABLE);
- //=============================================================================
- //LED -> PC13
- //=============================================================================
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
-
- }
- void TIM3_PWM_Configuration(unsigned int freq, uint8_t duty_cycle)
- {
- // 配置TIM3生成PWM信號
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
-
- // 使能TIM3時鐘
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能GPIO外設和AFIO復用功能模塊時鐘
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
-
- // 計數器模式設置為向上計數模式
- TIM_TimeBaseStructure.TIM_Period = (72000000 / freq) - 1; // 設置自動重裝載值
- TIM_TimeBaseStructure.TIM_Prescaler = 0; // 不分頻
- TIM_TimeBaseStructure.TIM_ClockDivision = 0;
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
- // PWM模式3配置: PWM信號在下一個更新事件后有效
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = (duty_cycle * (72000000 / freq)) / 100; // 根據占空比計算脈沖寬度
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
- TIM_OC3Init(TIM3, &TIM_OCInitStructure);
- // // 使能TIM3主輸出
- TIM_Cmd(TIM3, ENABLE);
- }
- void DMA_Configuration(uint32_t pwmBuffer1)
- {
- DMA_InitTypeDef DMA_InitStructure;
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
- DMA_DeInit(DMA1_Channel2);
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&TIM3->CCR3;//外設的基地址（寄存器的地址）
- DMA_InitStructure.DMA_MemoryBaseAddr = pwmBuffer1; //內存的基地址（可以是代碼中定義的數組的地址）
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//DMA的數據傳輸方向
- DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;//外設（內部的FLASH）地址遞增
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;// 內存地址遞增
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;// 外設數據單位
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;// 內存數據單位
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//DMA模式，一次或者循環模式
- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
- DMA_InitStructure.DMA_Priority = DMA_Priority_High;
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(DMA1_Channel2, &DMA_InitStructure);
- DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE);
- NVIC_EnableIRQ(DMA1_Channel2_IRQn);
- DMA_Cmd(DMA1_Channel2, ENABLE);
- TIM_DMACmd(TIM3, TIM_DMA_Update, ENABLE);
- // 使能TIM3主輸出
- TIM_Cmd(TIM3, ENABLE);
- }
- void DMA1_Channel2_IRQHandler(void)
- {
- if (DMA_GetITStatus(DMA1_IT_TC2))
- {
- DMA_ClearITPendingBit(DMA1_IT_TC2);
-
- // 重新加載DMA緩沖區以重復傳輸
- DMA_SetCurrDataCounter(DMA1_Channel2, BUFFER_SIZE);
- DMA_Cmd(DMA1_Channel2, ENABLE);
- }
- }
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