c6748读取ADS1271数据

量过时序吗？先看一下ADC往c6748 McBSP口送的数据是否正确?

程序如下：

void McBSPInit(void)
{
configureMcbsp();

HWREG(SOC_MCBSP_0_CTRL_REGS + MCBSP_SPCR) = 0; //发送和接受复位

HWREG(SOC_MCBSP_0_CTRL_REGS + MCBSP_PCR) = HWREG(SOC_MCBSP_0_CTRL_REGS + MCBSP_PCR)
| MCBSP_PCR_CLKRM //CLKR is an output pin and is driven by the internal sample-rate generator.
| MCBSP_PCR_CLKRP; //Receive data sampled on rising edge of CLKR.

unsigned int FramePeriod;
unsigned char FrameWidth,SampleRate;

FramePeriod = 200;
FrameWidth = 1;
SampleRate = 200;

HWREG(SOC_MCBSP_0_CTRL_REGS + MCBSP_SRGR) = HWREG(SOC_MCBSP_0_CTRL_REGS + MCBSP_SRGR)
| MCBSP_SRGR_CLKSM //CLKSM=1,SCLKME=0,McBSP internal input clock.
| ( FramePeriod << MCBSP_SRGR_FPER_SHIFT ) //Range is 1 to 4096 sample-rate generator clock (CLKG) periods.
| ( FrameWidth << MCBSP_SRGR_FWID_SHIFT )
| ( SampleRate << MCBSP_SRGR_CLKGDV_SHIFT ); //Frame width value plus 1 specifies the width of the frame-sync pulse (FSG) during its active period.

unsigned char RevWordLength1;

RevWordLength1 = MCBSP_RCR_RWDLEN1_24BIT;
//RevWordLength2 = MCBSP_RCR_RWDLEN2_24BIT;

HWREG(SOC_MCBSP_0_CTRL_REGS + MCBSP_RCR) = ( 0 << MCBSP_RCR_RPHASE_SHIFT ) //Single-phase frame
| ( MCBSP_RCR_RCOMPAND_MSB << MCBSP_RCR_RCOMPAND_SHIFT ) //No companding, data transfer starts with MSB first.
| ( MCBSP_RCR_RDATDLY_0BIT << MCBSP_RCR_RDATDLY_SHIFT ) //0-bit data delay
| ( 0 << MCBSP_RCR_RFRLEN1_SHIFT ) //1 word in phase 1
| ( RevWordLength1 << MCBSP_RCR_RWDLEN1_SHIFT ); //Receive word length1 is 24 bits.

Delay(100);

HWREG(SOC_MCBSP_0_CTRL_REGS + MCBSP_SPCR) =
MCBSP_SPCR_RRST //接受使能
| MCBSP_SPCR_GRST;
}

FSR都没有收到信号.

只是FSR没有信号？CLKR上有信号吗？

CLKR有1.129MHZ的方波

PCR. FSRM位设成1了吗？由Sample rate generator产生。

ADS1271 我用的是SPI模式，FSR是作为输入信号的，接受ADS1271发送过来的同步信号的，所以我这里设置的是0。

c6748 mcbsp不支持spi模式。下面的文档有说明。

24.2.10 SPI Operation Using the Clock Stop Mode
The McBSP on this device does not support the SPI protocol.

http://www.ti.com/lit/ug/spruh79b/spruh79b.pdf
 

那可以用ADS1271的FRAME-SYNC模式吗？

不清楚ADS1271 frame-sync模式具体是什么。

就DSP这边而言，MCBSP口是个同步口，时序上两者能匹配就可以收发。

另外，如果要用ADS1271 SPI模式的话，可以考虑和C6748的SPI口接。