1 引脚定义
unsigned char ch_temp;
#define AD_FF 1
#define AD_ZF 2
#define AD_MF 3
#define AD_GM 4
#define ADC124S21_CS_PA4_OUT GPIO_Pin_4 //使用PA4作为输出,控制ADC124S21芯片的片选
#define ADC124S21_CLK_PA5_SCK GPIO_Pin_5 //使用PA5作为输出,模拟用作ADC124S21的CLK
#define ADC124S21_DATA_PA7_DIN GPIO_Pin_7 //使用PA7作为输出,连接ADC124S21的DIN
#define ADC124S21_DATA_PA6_DOUT GPIO_Pin_6 //使用PA6作为输入,连接ADC124S21的DOUT
2 define 高低电平
#define AD_CS_H GPIO_SetBits(GPIOA,ADC124S21_CS_PA4_OUT)
#define AD_CS_L GPIO_ResetBits(GPIOA,ADC124S21_CS_PA4_OUT)
#define AD_DIN_H GPIO_SetBits(GPIOA,ADC124S21_DATA_PA7_DIN)
#define AD_DIN_L GPIO_ResetBits(GPIOA,ADC124S21_DATA_PA7_DIN)
#define AD_SCLK_H GPIO_SetBits(GPIOA,ADC124S21_CLK_PA5_SCK)
#define AD_SCLK_L GPIO_ResetBits(GPIOA,ADC124S21_CLK_PA5_SCK)
#define AD_DOUTGPIO_ReadInputDataBit(GPIOA, ADC124S21_DATA_PA6_DOUT)
3 gpio口的配置
/**
- 配置用于操作ADC124S21的模拟SPI GPIO端口
*/
int U11ADC124S021_GPIO_init()
{ GPIO_InitTypeDef ADC124S21_GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
ADC124S21_GPIO_InitStructure.GPIO_Pin = ADC124S21_CS_PA4_OUT; //片选引脚配置
ADC124S21_GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
ADC124S21_GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_Init(GPIOA, &ADC124S21_GPIO_InitStructure);
GPIO_SetBits(GPIOA,ADC124S21_CS_PA4_OUT);
ADC124S21_GPIO_InitStructure.GPIO_Pin = ADC124S21_CLK_PA5_SCK; //时钟引脚配置
ADC124S21_GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
ADC124S21_GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_Init(GPIOA, &ADC124S21_GPIO_InitStructure);
ADC124S21_GPIO_InitStructure.GPIO_Pin = ADC124S21_DATA_PA7_DIN; //DIN引脚配置
ADC124S21_GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
ADC124S21_GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_Init(GPIOA, &ADC124S21_GPIO_InitStructure);
ADC124S21_GPIO_InitStructure.GPIO_Pin = ADC124S21_DATA_PA6_DOUT; //DOUT引脚配置
ADC124S21_GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
ADC124S21_GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输出
GPIO_Init(GPIOA, &ADC124S21_GPIO_InitStructure);
return 0;
}
4 ad转换函数
/********************************************************************************************************
**函数名称：U11_AD_124S021()
**函数功能：用于AD转换
**输入变量：channel 通道数；channel=1，则选择通道1；channel=2，则选择通道2.
**输出变量：ad_val，AD转换值
********************************************************************************************************/
u32 U11_AD_124S021(unsigned char channel)
{ unsignedchar ch = 0;
unsigned char i;
unsigned int ad_val=0; //AD转换值
AD_SCLK_H; //时钟输入端置高
AD_CS_L; //片选控制端置低，AD转换使能
__nop();
__nop();
__nop();
if( channel == AD_FF )
ch = 0x00; //选择通道1 聚焦值 复制代码
else if( channel == AD_ZF )
ch = 0x08; //选择通道2 变倍值 复制代码
else if( channel == AD_MF )
ch = 0x10; //选择通道3 天线电机值 复制代码
else if( channel == AD_GM )
ch = 0x18; //选择通道4 光敏值 复制代码
ch_temp = ch;
for(i=0; i<8; i++)
{ AD_SCLK_L; //时钟输入置低 __nop(); __nop(); __nop(); if((ch_temp&0x80)==0x00) AD_DIN_L;//通过串行方式输入通道选择 else AD_DIN_H; ch_temp<<=1; AD_SCLK_H; //时钟输入置高，在此上升沿DIN实现1位输入 __nop(); __nop(); __nop(); } 复制代码
for(i=0; i<8; i++)
{ AD_SCLK_L; AD_SCLK_H; } 复制代码
AD_CS_H;
ad_val=0;
AD_SCLK_H;
AD_CS_L;
__nop();
__nop();
__nop();
for(i=0; i<8; i++)
{ ad_val=(ad_val<<1); AD_SCLK_L; __nop(); __nop(); __nop(); if(AD_DOUT) { ad_val++; } else { __nop(); __nop(); __nop(); } if((ch&0x80)==0x00) AD_DIN_L; else AD_DIN_H; ch<<=1; AD_SCLK_H; __nop(); __nop(); __nop(); } 复制代码
for(i=0; i<8; i++)
{ ad_val=(ad_val<<1); AD_SCLK_L; __nop(); __nop(); __nop(); if(AD_DOUT) { ad_val++; } else { __nop(); __nop(); __nop(); } AD_SCLK_H; } 复制代码
AD_CS_H;
ad_val=(ad_val&0x0fff);
//adtest=ad_val; returnad_val; 复制代码
}
