采用STM32F103VET6单片机，DAC+DMA+TIM2触发方式，通道1输出正弦波，参考例程配置，但是没有信号输出，硬件检查了正常。求助
#include "stm32f10x.h" u16 Dac1_Data[101]={ 2048,2177,2305,2432,2557,2681,2802,2920,3034,3145,3251,3353,3449,3540,3625,3704,3777,3842,3901,3952, 3995,4031,4059,4080,4092,4095,4092,4080,4060,4032,3996,3953,3902,3844,3778,3706,3628,3543,3452,3355, 3254,3148,3037,2923,2805,2684,2560,2435,2308,2180,2051,1923,1795,1668,1542,1419,1297,1179,1065,954, 847,746,649,558,473,394,321,255,197,145,102,65,37,17,4,0,4,16,35,63, 99,142,193,251,316,388,466,551,642,738,839,946,1056,1171,1288,1409,1533,1658,1785,1913, 2041}; void RCC_Configuration(void) { ErrorStatus HSEStartUpStatus; /* RCC system reset(for debug purpose) */ RCC_DeInit(); /* Enable HSE */ RCC_HSEConfig(RCC_HSE_ON); /* Wait till HSE is ready */ HSEStartUpStatus = RCC_WaitForHSEStartUp(); if(HSEStartUpStatus == SUCCESS) { /* Enable Prefetch Buffer */ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); /* Flash 2 wait state */ FLASH_SetLatency(FLASH_Latency_2); /* HCLK = SYSCLK */ RCC_HCLKConfig(RCC_SYSCLK_Div1); /* PCLK2 = HCLK */ RCC_PCLK2Config(RCC_HCLK_Div1); /* PCLK1 = HCLK/2 */ RCC_PCLK1Config(RCC_HCLK_Div2); /* PLLCLK = 8MHz * 9 = 72 MHz */ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); /* Enable PLL */ RCC_PLLCmd(ENABLE); /* Wait till PLL is ready */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) { } /* Select PLL as system clock source */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* Wait till PLL is used as system clock source */ while(RCC_GetSYSCLKSource() != 0x08) { } } RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2,ENABLE); RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2 | RCC_APB1Periph_DAC,ENABLE); /* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and AFIO clocks 72M*/ RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM8, ENABLE); } /**ÍâΧµ×²ãÇý¶¯¡¢IO¿ÚģʽµÄÉèÖÃ**/ void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; //DAC1 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;//GPIO_Mode_AIN;//Ä£ÄâÊäÈë GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); } void DAC_Configuration(void) { DAC_InitTypeDef DAC_InitStructure; /* DAC channel1 Configuration */ DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO; // T2´¥·¢¹¦ÄÜ DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None; // ²»Ê¹Óò¨Ðη¢ÉúÆ÷ DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0; // Êä³ö»º´æ¹Ø±Õ DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; // Êä³ö»º´æ¹Ø±Õ DAC_Init(DAC_Channel_1, &DAC_InitStructure); // Æô¶¯ADCת»» } void DMA_Configuration(void) { DMA_InitTypeDef DMA_InitStructure; DMA_DeInit(DMA2_Channel3); /* DMA2 Configuration */ DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&(DAC->DHR12R1); // DAC1µØÖ· DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&Dac1_Data; // ÄÚ´æµØÖ· DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; // ÄÚ´æÊä³öÊý¾Ýµ½ÍâÉè DMA_InitStructure.DMA_BufferSize = 101; // ¼Ä´æÆ÷´óС DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; // ÍâÉèµØÖ·²»µÝÔö DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // ÄÚ´æµØÖ·µÝÔö DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; // ¿í¶È°ë×Ö DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord; // ¿í¶È°ë×Ö DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; // ¹¤×÷ÔÚÑ»·»º´æģʽ DMA_InitStructure.DMA_Priority = DMA_Priority_High; // Êý¾ÝÓÅÏȼ¶ DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; // ûÓÐÉèÖÃÄÚ´æµ½ÄÚ´æ´«Êä DMA_Init(DMA2_Channel3,&DMA_InitStructure); // DAC1¶ÔÓ¦DMA2ͨµÀ3 /* Enable DAC Channel1 */ DMA_Cmd(DMA2_Channel3,ENABLE);//ʹÄÜDAC1 DAC_Cmd(DAC_Channel_1,ENABLE);//ʹÄÜDAC1 DAC_DMACmd(DAC_Channel_1,ENABLE);//ʹÄÜDAC1µÄDMA TIM_Cmd(TIM2,ENABLE);//ʹÄÜTIM2 } void TIM_Configuration(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; /* TIM2 Configuration */ /* Time base configuration */ TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); TIM_TimeBaseStructure.TIM_Period = 0x19; //ÉèÖÃÊä³öƵÂÊ Value=72000000/(101*F) TIM_TimeBaseStructure.TIM_Prescaler = 0x0; //²»Ô¤·ÖƵ TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //²»Ô¤·ÖƵ TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); /* TIM2 TRGO selection */ TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update); } int main(void) { RCC_Configuration(); //ÅäÖÃʱÖÓ GPIO_Configuration(); //ÅäÖÃIO¿Ú TIM_Configuration(); DAC_Configuration(); DMA_Configuration(); while(1) { } }
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