AD7606 与STM32MINI板SPI通信采集数据，昨天采样两线全双工，读出数据为0000，现在改为一线只读，读出数据与实际接入电压不对...-第2页回答

1楼-- · 2019-08-17 21:13

#include "ad7606_spi.h"
#include "LED.h"
#include "BEEP.h"
/*
PB12: 片选    输出低电平有效
PB13: 时钟    输出
PB14: MISO    输入

PC1: 复位    输出高电平有效
PC2: BUSY       输入
PC4: CVA/CVB    输出低电平有效
PC5: FRST       输入
*/

/*spi配置函数*/
void ad7606_spi_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef  SPI_InitStructure;
//时钟
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );//PORTB时钟使能
RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2,  ENABLE );//SPI2时钟使能
//管脚配置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //PB13复用推挽输出 spi2 时钟
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB
GPIO_SetBits(GPIOB,GPIO_Pin_13);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;  //PB14上拉输入 spi2 miso
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB

//初始化
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_RxOnly;  //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b; //设置SPI的数据大小:SPI发送接收8位帧结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //串行同步时钟的空闲状态为高电平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //串行同步时钟的第二个跳变沿（上升或下降）数据被采样
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64; //定义波特率预分频的值:波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 15; //CRC值计算的多项式
SPI_Init(SPI2, &SPI_InitStructure);  //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器
//关闭或开启
SPI_Cmd(SPI2, DISABLE); //失能SPI外设
SPI_Cmd(SPI2, ENABLE); //使能SPI外设
}

/*控制管脚配置函数*/
void ad7606_GPIO_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOB, ENABLE );
//输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //PC4开始转换电平    PC4: CVA/CVB
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIOC
GPIO_SetBits(GPIOC,GPIO_Pin_4);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //PC1 eset复位
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIOC
GPIO_ResetBits(GPIOC,GPIO_Pin_1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //PB12CS片选
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB
GPIO_SetBits(GPIOB,GPIO_Pin_12);
//输入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //PC5、frst
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIOC

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //PC2usy
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIOC
}
/*
设置传输速度函数
//SPI 速度设置函数
//SpeedSet:
//SPI_BaudRatePrescaler_2 2分频
//SPI_BaudRatePrescaler_8 8分频
//SPI_BaudRatePrescaler_16  16分频
//SPI_BaudRatePrescaler_256 256分频
*/
void SPI_SetSpeed(u8 SPI_BaudRatePrescaler)
{
  assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
SPI2->CR1&=0XFFC7;
SPI2->CR1|=SPI_BaudRatePrescaler; //设置SPI2速度
SPI_Cmd(SPI2,ENABLE);
}

/*读传输内容函数*/
u16 SPI_ReadTwoByte(void)
{
u8 retry=0;
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET) //检查指定的SPI标志位设置与否:接受缓存非空标志位
{
retry++;
if(retry>200)return 0;
}
return SPI_I2S_ReceiveData(SPI2); //返回通过SPIx最近接收的数据
}
/*BUSY中断初始化*/
void ad7606_exti_init(void)
{
EXTI_InitTypeDef EXTI_Structre;
NVIC_InitTypeDef NVIC_Structre;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource2);
EXTI_Structre.EXTI_Line=EXTI_Line2;
EXTI_Structre.EXTI_LineCmd=ENABLE;
EXTI_Structre.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_Structre.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_Init(&EXTI_Structre);

NVIC_Structre.NVIC_IRQChannel=EXTI2_IRQn;
NVIC_Structre.NVIC_IRQChannelCmd=ENABLE;
NVIC_Structre.NVIC_IRQChannelPreemptionPriority=2;
NVIC_Structre.NVIC_IRQChannelSubPriority=2;
NVIC_Init(&NVIC_Structre);
}
/*中断2服务函数*/
extern u16 RESULT[24];
void EXTI2_IRQHandler(void)
{
u8 i=0;
delay_ms(10);
if(EXTI_GetITStatus(EXTI_Line2)==1)
{
AD_CS_0();
for (i = 0; i <24; i++)
{

RESULT[i]=SPI_ReadTwoByte();
// RESULT[i]=RESULT[i]*256+RESULT[i];
//RESULT[i]&=0x7fff;

}
AD_CS_1();
ad7606_Reset();
led1=!led1;
delay_ms(500);
// if(SPI_I2S_GetITStatus(SPI2,SPI_IT_CRCERR)==1)
// {
// beep=1;
// delay_ms(500);
// beep=0;
// }

}
EXTI_ClearITPendingBit(EXTI_Line2);
}
/*ad7606复位函数*/
void ad7606_Reset(void)
{
AD_RESET_LOW();

AD_RESET_HIGH();
AD_RESET_HIGH();
AD_RESET_HIGH();
AD_RESET_HIGH();

AD_RESET_LOW();
}
void ad7606_cv(void)
{
AD_CONVST_HIGH();
AD_CONVST_LOW();
AD_CONVST_LOW();
AD_CONVST_LOW(); /* 连续执行2次，低电平约50ns */

AD_CONVST_HIGH();
}
/*总初始化函数*/
void ad7606_init(void)
{
ad7606_spi_init();
ad7606_GPIO_init();
ad7606_exti_init();
ad7606_Reset();
}
/*某个通道数据函数*/
u16 AD7606_ReadAdc(u8 _ch)
{
u16 sAdc;
sAdc = RESULT[_ch];
return sAdc;
}

jack he

2楼-- · 2019-08-18 00:01

#include "stm32f10x.h"
#include "sys.h"
#include "LED.h"
#include "LCD.h"
#include "delay.h"
#include "usart.h"
#include "exit.h"
#include "time_pwm.h"
#include "driver.h"
#include "ad7606_spi.h"
#include "key.h"
#include "BEEP.h"

u16 RESULT[24]={0,0,0,0,0,0,0,0,0,0,0,0};

/************************************************
ALIENTEK 战舰STM32F103开发板实验
说明：ADC定时器2通道2触发（LCD必须在串口后初始化，利用的是pwm初始化函数（ADC_ExternalTrigConv_T2_CC2），key_up键按下后或pa0连入3.3伏测出电压对应数字量）
作者：JackSparrow
时间：2016/2/4
已测试
************************************************/

int main(void)
{

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
uart_init(115200);
LED_Init();
beep_Init();
delay_init();
KEY_Init();
ad7606_init();
// led0=0;//灭
// delay_ms(200);
// led0=1;//灭
beep=1;
delay_ms(500);
beep=0;
delay_ms(200);
LCD_Init();
POINT_COLOR=RED;
while(1)
{
if(KEY_Scan(0)==KEY0_PRES)
{
//ad7606_Reset();
ad7606_cv();
led0=!led0;
delay_ms(200);
LCD_ShowNum(30,70,RESULT[0],5,24);
LCD_ShowNum(30,95,RESULT[1],5,24);
LCD_ShowNum(30,120,RESULT[2],5,24);
LCD_ShowNum(30,145,RESULT[3],5,24);
LCD_ShowNum(30,170,RESULT[4],5,24);
LCD_ShowNum(30,195,RESULT[5],5,24);
LCD_ShowNum(30,220,RESULT[6],5,24);
LCD_ShowNum(30,245,RESULT[7],5,24);
LCD_ShowNum(30,270,RESULT[8],5,24);
LCD_ShowNum(30,295,RESULT[9],5,24);
LCD_ShowNum(30,10,RESULT[10],5,24);
LCD_ShowNum(30,35,RESULT[11],5,24);

LCD_ShowNum(100,70,RESULT[12],5,24);
LCD_ShowNum(100,95,RESULT[13],5,24);
LCD_ShowNum(100,120,RESULT[14],5,24);
LCD_ShowNum(100,145,RESULT[15],5,24);
LCD_ShowNum(100,170,RESULT[16],5,24);
LCD_ShowNum(100,195,RESULT[17],5,24);
LCD_ShowNum(100,220,RESULT[18],5,24);
LCD_ShowNum(100,245,RESULT[19],5,24);
LCD_ShowNum(100,270,RESULT[20],5,24);
LCD_ShowNum(100,295,RESULT[21],5,24);
LCD_ShowNum(100,10,RESULT[22],5,24);
LCD_ShowNum(100,35,RESULT[23],5,24);
}

}
}