希望大神能找一下原因
#include "dac.h"
#include "usart.h"
//////////////////////////////////////////////////////////////////////////////////
//本程序只供学习使用，未经作者许可，不得用于其它任何用途
//ALIENTEK战舰STM32开发板
//DAC 代码
//正点原子@ALIENTEK
//技术论坛:www.openedv.com
//修改日期:2012/9/8
//版本：V1.0
//版权所有，盗版必究。
//Copyright(C) 广州市星翼电子科技有限公司 2009-2019
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////
/*
//正弦波单个周期的点数
#define POINT_NUM 32
//波形数据 ---------------------------------------------------------
const uint16_t Sine12bit[POINT_NUM] = {
2048 , 2460 , 2856 , 3218 , 3532 , 3786 , 3969 , 4072 ,
4093 , 4031 , 3887 , 3668 , 3382 , 3042 , 2661 , 2255 ,
1841 , 1435 , 1054 , 714 , 428 , 209 , 65 , 3 ,
24 , 127 , 310 , 564 , 878 , 1240 , 1636 , 2048
};
*/
//正弦波单个周期的点数
#define POINT_NUM 256
//波形数据 ---------------------------------------------------------
const uint16_t Sine12bit[POINT_NUM] = { 0x7FF,0x831,0x863,0x896,0x8C8,0x8FA,0x92B,0x95D,0x98E,0x9C0,0x9F1,0xA21,0xA51,0xA81,0xAB1,0xAE0
,0xB0F,0xB3D,0xB6A,0xB98,0xBC4,0xBF0,0xC1C,0xC46,0xC71,0xC9A,0xCC3,0xCEB,0xD12,0xD38,0xD5E,0xD83
,0xDA7,0xDCA,0xDEC,0xE0D,0xE2E,0xE4D,0xE6C,0xE89,0xEA5,0xEC1,0xEDB,0xEF5,0xF0D,0xF24,0xF3A,0xF4F
,0xF63,0xF75,0xF87,0xF97,0xFA6,0xFB4,0xFC1,0xFCD,0xFD7,0xFE0,0xFE8,0xFEF,0xFF5,0xFF9,0xFFC,0xFFE
,0xFFE,0xFFE,0xFFC,0xFF9,0xFF5,0xFEF,0xFE8,0xFE0,0xFD7,0xFCD,0xFC1,0xFB4,0xFA6,0xF97,0xF87,0xF75
,0xF63,0xF4F,0xF3A,0xF24,0xF0D,0xEF5,0xEDB,0xEC1,0xEA5,0xE89,0xE6C,0xE4D,0xE2E,0xE0D,0xDEC,0xDCA
,0xDA7,0xD83,0xD5E,0xD38,0xD12,0xCEB,0xCC3,0xC9A,0xC71,0xC46,0xC1C,0xBF0,0xBC4,0xB98,0xB6A,0xB3D
,0xB0F,0xAE0,0xAB1,0xA81,0xA51,0xA21,0x9F1,0x9C0,0x98E,0x95D,0x92B,0x8FA,0x8C8,0x896,0x863,0x831
,0x7FF,0x7CD,0x79B,0x768,0x736,0x704,0x6D3,0x6A1,0x670,0x63E,0x60D,0x5DD,0x5AD,0x57D,0x54D,0x51E
,0x4EF,0x4C1,0x494,0x466,0x43A,0x40E,0x3E2,0x3B8,0x38D,0x364,0x33B,0x313,0x2EC,0x2C6,0x2A0,0x27B
,0x257,0x234,0x212,0x1F1,0x1D0,0x1B1,0x192,0x175,0x159,0x13D,0x123,0x109,0x0F1,0x0DA,0x0C4,0x0AF
,0x09B,0x089,0x077,0x067,0x058,0x04A,0x03D,0x031,0x027,0x01E,0x016,0x00F,0x009,0x005,0x002,0x000
,0x000,0x000,0x002,0x005,0x009,0x00F,0x016,0x01E,0x027,0x031,0x03D,0x04A,0x058,0x067,0x077,0x089
,0x09B,0x0AF,0x0C4,0x0DA,0x0F1,0x10A,0x123,0x13D,0x159,0x175,0x192,0x1B1,0x1D0,0x1F1,0x212,0x234
,0x257,0x27B,0x2A0,0x2C6,0x2EC,0x313,0x33B,0x364,0x38D,0x3B8,0x3E2,0x40E,0x43A,0x466,0x494,0x4C1
,0x4EF,0x51E,0x54D,0x57D,0x5AD,0x5DD,0x60E,0x63E,0x670,0x6A1,0x6D3,0x704,0x736,0x768,0x79B,0x7CD};
const uint16_t Sawtooth12bit[POINT_NUM] = {0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240
,256,273,289,305,321,337,353,369,385,401,417,433,449,465,481,497,513,529,546,562,578,594,610,626,
642,658,674,690,706,722,738,754,770,786,802,819,835,851,867,883,899,915,931,947,963,979,995,1011,
1027,1043,1059,1075,1092,1108,1124,1140,1156,1172,1188,1204,1220,1236,1252,1268,1284,1300,1316,1332,
1348,1365,1381,1397,1413,1429,1445,1461,1477,1493,1509,1525,1541,1557,1573,1589,1605,1621,1638,1654,
1670,1686,1702,1718,1734,1750,1766,1782,1798,1814,1830,1846,1862,1878,1894,1911,1927,1943,1959,1975,
1991,2007,2023,2039,2055,2071,2087,2103,2119,2135,2151,2167,2184,2200,2216,2232,2248,2264,2280,2296,
2312,2328,2344,2360,2376,2392,2408,2424,2440,2457,2473,2489,2505,2521,2537,2553,2569,2585,2601,2617,
2633,2649,2665,2681,2697,2713,2730,2746,2762,2778,2794,2810,2826,2842,2858,2874,2890,2906,2922,2938,
2954,2970,2986,3003,3019,3035,3051,3067,3083,3099,3115,3131,3147,3163,3179,3195,3211,3227,3243,3259,
3276,3292,3308,3324,3340,3356,3372,3388,3404,3420,3436,3452,3468,3484,3500,3516,3532,3549,3565,3581,
3597,3613,3629,3645,3661,3677,3693,3709,3725,3741,3757,3773,3789,3805,3822,3838,3854,3870,3886,3902,
3918,3934,3950,3966,3982,3998,4014,4030,4046,4062,4078,4095}; //已用函数代替
uint32_t DualSine12bit[POINT_NUM];
//DAC通道1输出初始化
void Dac1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
DAC_InitTypeDef DAC_InitType;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE ); //使能PORTA通道时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE ); //使能DAC通道时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4| GPIO_Pin_5; // 端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
DAC_StructInit(&DAC_InitType);
//初始化DAC通道1
DAC_InitType.DAC_Trigger=DAC_Trigger_T2_TRGO; //使用触发功能 TIM2作为触发源
DAC_InitType.DAC_WaveGeneration=DAC_WaveGeneration_None;//不使用波形发生
DAC_InitType.DAC_OutputBuffer=DAC_OutputBuffer_Disable ; //DAC1输出缓存关闭 BOFF1=1
DAC_Init(DAC_Channel_1,&DAC_InitType); //初始化DAC通道1
//初始化DAC通道2
DAC_InitType.DAC_Trigger=DAC_Trigger_T6_TRGO; //使用触发功能 TIM6作为触发源
DAC_InitType.DAC_WaveGeneration=DAC_WaveGeneration_None;//不使用波形发生
DAC_InitType.DAC_OutputBuffer=DAC_OutputBuffer_Disable ; //DAC1输出缓存关闭 BOFF1=1
DAC_Init(DAC_Channel_2,&DAC_InitType); //初始化DAC通道2
DAC_Cmd(DAC_Channel_1, ENABLE); //使能通道1 由PA4输出
DAC_Cmd(DAC_Channel_2, ENABLE); //使能通道2 由PA5输出
/* 使能DAC的DMA请求 对 DAC1 和 2 的操作是同步的，所以只要把 DMA 与
DAC 通道 2 关联起来即可，当使用 DMA 设置通道 2 的数据值时， 同时更新通道 1 的内容*/
DAC_DMACmd(DAC_Channel_2, ENABLE);
}
static void DAC_TIM_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* 使能TIM2、TIM6时钟，TIM2CLK 为72M */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
/* TIM2基本定时器配置 */
TIM_TimeBaseStructure.TIM_Period = (30-1); //定时周期 20
TIM_TimeBaseStructure.TIM_Prescaler = 0x0; //预分频，不分频 72M / (0+1) = 72M
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //时钟分频系数
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = (80-1); //定时周期 20
TIM_TimeBaseStructure.TIM_Prescaler = 0x0; //预分频，不分频 72M / (0+1) = 72M
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //时钟分频系数
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);
/* 配置TIM2触发源 */
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); //设置TIM2输出触发为更新模式
TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update); //设置TIM6输出触发为更新模式
/* 使能TIM2、TIM6 */
TIM_Cmd(TIM2, ENABLE);
TIM_Cmd(TIM6, ENABLE);
}
static void DAC_DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
/* 使能DMA2时钟 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
/* 配置DMA2 */
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_ADDRESS; //外设数据地址
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&DualSine12bit ; //内存数据地址 DualSine12bit
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //数据传输方向内存至外设
DMA_InitStructure.DMA_BufferSize = POINT_NUM; //缓存大小为POINT_NUM字节
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设数据地址固定
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存数据地址自增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //外设数据以字为单位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //内存数据以字为单位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //循环模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //高DMA通道优先级
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //非内存至内存模式
DMA_Init(DMA2_Channel4, &DMA_InitStructure);
/* 使能DMA2-4通道 */
DMA_Cmd(DMA2_Channel4, ENABLE);
}
void DAC_Mode_Init(void)
{
uint32_t Idx = 0;
float outdata=0;
Dac1_Init();
DAC_TIM_Config();
/* 填充正弦波形数据，双通道右对齐*/
for (Idx = 0; Idx < POINT_NUM; Idx++)
{
outdata = (Sine12bit[Idx] << 16) + (Sawtooth12bit[Idx]);
DualSine12bit[Idx]=outdata;
}
DAC_DMA_Config();
}
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发表于 2021-10-10 14:48:11
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