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111 lines
3.0 KiB
111 lines
3.0 KiB
3 years ago
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#include "adc.h"
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#include "delay.h"
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//////////////////////////////////////////////////////////////////////////////////
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//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
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//ALIENTEK 精英STM32开发板
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//ADC 代码
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//正点原子@ALIENTEK
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//技术论坛:www.openedv.com
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//修改日期:2012/9/7
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//版本：V1.0
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//版权所有，盗版必究。
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//Copyright(C) 广州市星翼电子科技有限公司 2009-2019
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//All rights reserved
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//////////////////////////////////////////////////////////////////////////////////
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//初始化ADC
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//这里我们仅以规则通道为例
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//我们默认将开启通道0~3
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void Adc_Init(void)
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{
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ADC_InitTypeDef ADC_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE ); //使能ADC1通道时钟
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RCC_ADCCLKConfig(RCC_PCLK2_Div6); //设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M
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//PA1 作为模拟通道输入引脚
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_0;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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ADC_DeInit(ADC1); //复位ADC1,将外设 ADC1 的全部寄存器重设为缺省值
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ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在独立模式
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ADC_InitStructure.ADC_ScanConvMode = DISABLE; //模数转换工作在单通道模式
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ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //模数转换工作在单次转换模式
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ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //转换由软件而不是外部触发启动
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ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
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ADC_InitStructure.ADC_NbrOfChannel = 1; //顺序进行规则转换的ADC通道的数目
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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
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ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1
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ADC_ResetCalibration(ADC1); //使能复位校准
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while(ADC_GetResetCalibrationStatus(ADC1)); //等待复位校准结束
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ADC_StartCalibration(ADC1); //开启AD校准
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while(ADC_GetCalibrationStatus(ADC1)); //等待校准结束
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ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的软件转换启动功能
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}
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//获得ADC值
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//ch:通道值 0~3
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u16 Get_Adc(u8 ch)
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{
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//设置指定ADC的规则组通道，一个序列，采样时间
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ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 ); //ADC1,ADC通道,采样时间为239.5周期
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ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的软件转换启动功能
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while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//等待转换结束
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return ADC_GetConversionValue(ADC1); //返回最近一次ADC1规则组的转换结果
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}
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u16 Get_Adc_Average(u8 ch,u8 times)
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{
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u32 temp_val=0;
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u8 t;
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for(t=0;t<times;t++)
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{
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temp_val+=Get_Adc(ch);
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delay_ms(5);
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}
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return temp_val/times;
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}
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