SPI-AD7927采集问题

发布于 2020-03-10 14:52:35 浏览：1378 订阅该版

u32 ADC_Calculate(E_ADC_CHANNEL channel,u8 times) 
{
	uint8_t i; 							// AD通道数目
	u32 AD_SampResult= 0;
	u32 j = 0;
 if (OSRunning == OS_TRUE) //ucoss系统启动后需要添加这个禁止任务切换，但允许中断打断 LCF
	{
	 OSSchedLock(); //UCOSII的方式,禁止OS任务调度
	}	
	ReadAD7927(1,channel); 
//	ReadAD7927(1,channel);	
	for(i=0;i<=times;i++)					
	{
		if(i==0) 
		{			
			ReadAD7927(0,channel); // 丢掉每个通道第一次无效数据
		 delay_ms(2);			 // 延时至少2ms
		}
		else 
		{
			j = ReadAD7927(0,channel);
			u1_printf("ADC_Calculate:channel=%u,j=%u! ",channel,j);
		 AD_SampResult += j;
		 delay_ms(1); //延时至少1ms
		}
	}
	AD_SampResult = AD_SampResult/times;
	if (OSRunning == OS_TRUE) 
	{
		OSSchedUnlock();	//UCOSII的方式,恢复OS任务调度 	
	}	
	return AD_SampResult;
}

u16 ReadAD7927(uint8_t cmd,uint8_t tData)
{ 
	uint16_t value;
	uint8_t tmp1,tmp2;

SpiEnable(SPI1_ADC);
	Spi_delay(); // 60ns min 单指令时间13.98n
	if(cmd)
	{
		tmp1 = SPI_ReadWriteByte(SPI1_ADC,AD7927CTRREGH|((tData%8)<<2));
		tmp2 = SPI_ReadWriteByte(SPI1_ADC,AD7927CTRREGL);
	}
	else
	{
		tmp1 = SPI_ReadWriteByte(SPI1_ADC,0);
		tmp2 = SPI_ReadWriteByte(SPI1_ADC,0);
		value = ((tmp1<<8)&0x0f00)|(tmp2&0x00ff);
	}
	
 SpiDisable(SPI1_ADC);

return value;
}
/**************************************************************
* 函数名称: SPI_ReadWriteByte(uint8_t cs,uint8_t TxData) 
* 参    数: no:SPI端口号（1或2）
* 返 回 值: 
* 描    述: 向SPI外设写读一个数据   
**************************************************************	
*/
uint8_t SPI_ReadWriteByte(uint8_t cs,uint8_t TxData) 
{     
	
	if(cs==SPI1_ADC)
	{
		while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){}//等待发送区空

SPI_I2S_SendData(SPI1, TxData); //通过外设SPIx发送一个byte  数据
			
		while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){} //等待接收完一个byte

return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据
	}
	else if(cs==SPI2_FLASH)
	{
		while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET){}//等待发送区空

SPI_I2S_SendData(SPI2, TxData); //通过外设SPIx发送一个byte  数据
			
		while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET){} //等待接收完一个byte

return SPI_I2S_ReceiveData(SPI2); //返回通过SPIx最近接收的数据	
	}	
	else  //SPI2_TF
	{
		while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET){}//等待发送区空

SPI_I2S_SendData(SPI2, TxData); //通过外设SPIx发送一个byte  数据
			
		while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET){} //等待接收完一个byte

return SPI_I2S_ReceiveData(SPI2); //返回通过SPIx最近接收的数据
	}  
}
void SPI1_Init(void)
{	 
	GPIO_InitTypeDef  GPIO_InitStructure;
	SPI_InitTypeDef   SPI_InitStructure;
	
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//使能GPIOA时钟
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//使能GPIOB时钟
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);//使能GPIOC时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);//使能SPI1时钟

//GPIOA5,A6初始化设置
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6;//
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
	GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化
	
	//GPIOB5初始化设置
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
	GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化	
	
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource5,GPIO_AF_SPI1); //复用
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_SPI1); //复用
	GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI1); //复用

//GPIOA4
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//PA4
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//输出
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
	GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化

SpiDisable(SPI1_ADC);//SPI ADC不选中

//这里只针对SPI口初始化
	RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,ENABLE); //复位SPI1
	RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);//启动SPI1

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //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_8b;		//设置SPI的数据大小:SPI发送接收8位帧结构
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;		//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_256;		//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 = 7;	//CRC值计算的多项式
	SPI_Init(SPI1, &SPI_InitStructure);  //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器

SPI1_SetSpeed(SPI_BaudRatePrescaler_256);//SPI1为84M时钟,传输速度设置为84M/256=328.125KHz

SPI_Cmd(SPI1, ENABLE); //使能SPI外设
}
以上是用ucos系统写的 SPI操作读取AD7927模拟量通道数据，没有问题；

现在修改成RTT系统 收到数据不稳定，数据跳变，下面是RTT系统代码
/**************************************************************
* 函数名称: 模拟量计算
* 参 数: 
* 返 回 值: 
* 描 述: 模拟量计算(保留两位小数)
**************************************************************/ 
rt_uint32_t ADC_Calculate(E_ADC_CHANNEL channel,rt_uint8_t times) 
{
	rt_uint8_t i; 							// AD通道数目
	rt_uint32_t AD_SampResult= 0;
	rt_uint32_t j = 0;
	rt_lprintf("AAAAAAAAAAA ");
	ReadAD7927(1,channel);
	rt_lprintf("BBBBBBBBBBB ");
	rt_thread_mdelay(5);	 // 延时5ms	
	for(i=0;i<=times;i++)					
	{
		if(i==0) 
		{

ReadAD7927(0,channel); // 丢掉每个通道第一次无效数据
			rt_thread_mdelay(5);	 // 延时2ms
		}
		else 
		{
			j = ReadAD7927(0,channel);
			rt_lprintf("ADC_Calculate:channel=%u,j=%u! ",channel,j);
		 AD_SampResult += j;
		 rt_thread_mdelay(5); // 延时1ms		
		}
	}
	AD_SampResult = AD_SampResult/times;
	
	return AD_SampResult;
}
/**************************************************************
* 函数名称:ReadAD7927()
* 参 数: tData
* 返 回 值: 无 
* 描 述: 读取AD采样数据函数 
 tData: bit7-4: 选择通道 
 bit3-2：01: 8-bit output length 
 X0: 12-bit output length (see Note) 
						 11: 16-bit output length
 bit1： 0：MSB out first
 1: LSB out first
 bit0： 0: Unipolar binary
 1: Bipolar 2s complement
**************************************************************/ 
uint16_t ReadAD7927(uint8_t cmd,uint8_t tData)
{ 
	uint16_t value;
	uint16_t temp1,temp2;
	extern struct rt_spi_device *spi_dev_ad7927;

if(cmd)
	{
		rt_spi_sendrecv8(spi_dev_ad7927, AD7927CTRREGH|((tData%8)<<2));
		rt_spi_sendrecv8(spi_dev_ad7927, AD7927CTRREGL);		
	}
	else
	{
		temp1 = rt_spi_sendrecv8(spi_dev_ad7927, 0);
		temp2 = rt_spi_sendrecv8(spi_dev_ad7927, 0);	
		value = ((temp1<<8)&0x0f00)|(temp2&0x00ff);
	}

return value;
}
 /* 查找 spi 设备获取设备句柄 */
 spi_dev_ad7927 = (struct rt_spi_device *)rt_device_find(DEVICE_NAME);
 if (!spi_dev_ad7927)
 {
 rt_lprintf("spi sample run failed! can't find %s device! ", DEVICE_NAME);
 }
 else
 {
 /* config spi */
 {
 struct rt_spi_configuration cfg;
 cfg.data_width = 8;
			cfg.mode = RT_SPI_MASTER | RT_SPI_MSB | RT_SPI_MODE_0;
 cfg.max_hz = 328125; /* 400K */
 rt_spi_configure(spi_dev_ad7927, &cfg);
 } 
		
		rt_lprintf("analog:%s find OK! ",DEVICE_NAME);
 }
[0310-144429]analog:ad7927 find OK!
[0310-144429AAAAAAAAAAA
[0310-144429SPI_MODE_MASTER
[0310-144429SPI_DIRECTION_2LINES
[0310-144429data_width=8
[0310-144429SPI_PHASE_1EDGE
[0310-144429SPI_POLARITY_LOW
[0310-144429]cfg->max_hz=328125Hz
[0310-144429]SPI_APB_CLOCK=84000000Hz
[0310-144429]sys freq: 168000000, pclk2 freq: 84000000, SPI limiting freq: 328125, BaudRatePrescaler: 56
[0310-144429-----131!
[0310-144429-----16!
[0310-144429BBBBBBBBBBB
msh />[0310-144429]oneSec_cnt 参考值=162898,CPU_TICK=200
[0310-144430-----0!
[0310-144430-----0!
[0310-144430][tcu:]HeartSendCount=10,PowerSendCount=1
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=631!
[0310-144430][tcu:]RevFrameCount=0,osRunTime=1秒
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=1284!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=579!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=267!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=1791!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=620!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=1538!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=1103!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=323!
[0310-144430-----0!
[0310-144430-----0!
[0310-144430]ADC_Calculate:channel=0,j=1282!
[0310-144430]analog:strYC.V_cp1=3.10V---1000

问下大家可能是什么原因 ，时钟设置256分频了，SPI模式0   8位数，同用SPI，一样的板子 用之前ucoss的就行，移植成RTT接收数据跳变