stm32F4正弦波输出
单片机源程序如下:
- #include "dac.h"
- #include "sys.h"
- #include "math.h"
- #define PI 3.14159
- #define DAC_DHR12R1_ADDRESS 0x40007408
- u16 sinTable[tableSize];
- void sin_Generation(void)
- {
- u16 n;
- for(n=0;n<tableSize;n++)
- {
- sinTable[n] = (sin(2*PI*n/tableSize)+1)*2047;
- }
- }
- void TIM6_Configuration(void)
- {
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
- TIM_PrescalerConfig(TIM6, 83, TIM_PSCReloadMode_Update);
- TIM_SetAutoreload(TIM6, 4);
- TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
- TIM_Cmd(TIM6, ENABLE);
- }
- void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- }
- void DAC_DMA_Configuration(void)
- {
- DAC_InitTypeDef DAC_InitStructure;
- DMA_InitTypeDef DMA_InitStructure;
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
-
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
- DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
- DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
- DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
- DAC_Init(DAC_Channel_1, &DAC_InitStructure);
- DMA_DeInit(DMA1_Stream5);
- DMA_InitStructure.DMA_Channel = DMA_Channel_7;
- DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_ADDRESS;
- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&sinTable;
- DMA_InitStructure.DMA_BufferSize = tableSize;
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
- DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;
- DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
- DMA_InitStructure.DMA_Priority = DMA_Priority_High;
- DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
- DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
- DMA_Init(DMA1_Stream5, &DMA_InitStructure);
-
- DMA_Cmd(DMA1_Stream5, ENABLE);
-
- DAC_Cmd(DAC_Channel_1, ENABLE);
-
- DAC_DMACmd(DAC_Channel_1, ENABLE);
- }
所有资料51hei提供下载:
DAC+DMA成功输出正弦波.7z
(301.68 KB, 下载次数: 101)
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