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- 2015-3-28
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楼主 |
发表于 2015-4-5 10:09:52
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#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "lcd.h"
#include "adc.h"
#include "time.h"
#include "dma.h"
int ReserveBuffer[10]={1};
int adcv;
int main(void)
{
u8 x=0;
SystemInit();
delay_init();
NVIC_Configuration();
uart_init(9600);
LED_Init();
LCD_Init();
POINT_COLOR=BLUE;
while(1)
{
//先配置ADC再配置TIMER,奇怪的是LCD_ShowNum(20,60,ReserveBuffer[1],10,16);注掉这句话程序会卡死在那里
LCD_ShowString(5,5,"MiniSTM32 is ready...");
//先配置ADC
Adc_Init();
LCD_ShowString(20,40,"ADC_Init...");
ADC_DMA_Config((u32)ReserveBuffer,10);
//获取上一次DMA数据
LCD_ShowNum(20,60,ReserveBuffer[1],10,16);
//delay_ms(5);
//再配置TIMER
SampRate(100);
LCD_ShowString(20,80,"SampRate...");
//获取adc原始数据
adcv=Get_Adc(1);
LCD_ShowNum(20,100,adcv,10,16);
//开启DMA
LCD_ShowString(20,120,"ADC_DMA_Config...");
ADC_DMA_Enable(DMA1_Channel1);//使能DMA1_CHx
LCD_ShowString(20,140,"ADC_DMA_Enable...");
POINT_COLOR=RED;
//获取DMA数据
LCD_ShowNum(20,180,ReserveBuffer[1],10,16);
delay_ms(500);
if(x==12)x=0;
LED0=!LED0;
delay_ms(1000);
}
}
下面是子函数
DMA_InitTypeDef DMA_InitStructure;
u16 DMA1_MEM_LEN;
void ADC_DMA_Config(u32 buff,u16 buffsize)
{
DMA1_MEM_LEN=buffsize;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA传输
DMA_DeInit(DMA1_Channel1); //DMA的通道1
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1->DR; //DMA外设ADC基地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)buff; //DMA内存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外设作为数据传输来源
DMA_InitStructure.DMA_BufferSize = buffsize; //DMA通道的DMA缓存的大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //数据宽度为16位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //数据宽度为16位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA通道 x拥有中优先级
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x没有设置为内存到内存传输
DMA_Init(DMA1_Channel1, &DMA_InitStructure); //根据DMA_InitStruct中指定的参数初始化DMA1通道1
}
//开启一次DMA传输
void ADC_DMA_Enable(DMA_Channel_TypeDef*DMA_CHx)
{
DMA_Cmd(DMA1_Channel1, DISABLE ); //关闭通道
DMA_InitStructure.DMA_BufferSize = DMA1_MEM_LEN;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel1, ENABLE); //使能通道
}
void SampRate(u32 freq)
{
u16  eriod;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
Period=72000000/freq;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
/*TIM1初始化*/
TIM_Cmd(TIM1, DISABLE);//先停止TIM1时钟,以准备下面的设置
TIM_TimeBaseStructure.TIM_Period =  eriod;
TIM_TimeBaseStructure.TIM_Prescaler =0;
TIM_TimeBaseStructure.TIM_ClockDivision =0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, & TIM_TimeBaseStructure);
/* TIM1   WM1 */
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//pwm1模式
TIM_OCInitStructure.TIM_Pulse=TIM_TimeBaseStructure.TIM_Period/2;//捕获比较预装1/2(这个不懂)
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//比较输出使能
TIM_OC1Init(TIM1, & TIM_OCInitStructure);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
}
void Adc_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE ); //使能ADC1通道时钟
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //72M/6=12,ADC最大时间不能超过14M
//PA0/1/2/3 作为模拟通道输入引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_DeInit(ADC1); //将外设 ADC1 的全部寄存器重设为缺省值
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在独立模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //模数转换工作在单通道模式
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //模数转换工作在单次转换模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; //>>>>Tim1cc1触发启动,cc1即捕获比较寄存器产生的(溢出)事件
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = 1; //顺序进行规则转换的ADC通道的数目
ADC_Init(ADC1, &ADC_InitStructure); //根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器
ADC_RegularChannelConfig(ADC1, 1, 1, ADC_SampleTime_1Cycles5 ); //ADC1,ADC通道1,规则采样顺序值为1,采样时间为1.5周期
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1); //重置指定的ADC1的校准寄存器
while(ADC_GetResetCalibrationStatus(ADC1)); //获取ADC1重置校准寄存器的状态,设置状态则等待
ADC_StartCalibration(ADC1); //开始指定ADC1的校准状态
while(ADC_GetCalibrationStatus(ADC1)); //获取指定ADC1的校准程序,设置状态则等待
ADC_ExternalTrigConvCmd( ADC1, ENABLE); //使能指定的ADC1转换启动功能
}
//获得ADC值
//ch:通道值 0~3
u16 Get_Adc(u8 ch)
{
//设置指定ADC的规则组通道,设置它们的转化顺序和采样时间
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//等待转换结束
return ADC_GetConversionValue(ADC1); //返回最近一次ADC1规则组的转换结果
} |
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