TLV2548: 不能正确获取CFR值

Liushisan

Prodigy 10 points

Part Number: TLV2548

这是代码，两种方式都时使用过，先发送0XA000到TLV2548, 再发送0xa102设置寄存器，56位为0：0. 最后使用0x9000读取CFR值，然后读取的值不是上一步写入的0x102。

读出的值为0xffff。这是为什么呢？

1 年多前

0 Amy Luo 1 年多前

TI__Guru**** 185470 points

您好，

datasheet 13页有写CFR的时序图，datasheet 11页有读CFR的时序图，建议您用示波器抓下波形，对照看下时序是否正确？

0 Liushisan 1 年多前回复 Amy Luo

Prodigy 10 points

我测量了时钟和cs片选信号，然后使用该代码进行发送和接收数据时，发现cs有从高到低的转换，cs应该是正常的，但是时钟没有信号。这个问题能确定是由spi master controler出现了问题是吗？感谢。

int main(void)
{
    int Status;
    int i, j;
    int value;
    u16 sendValue = 0;
    xil_printf("====SPI Selftest Example =======\r\n");

    Status = spi0_init();
    if (Status != XST_SUCCESS)
    {
        xil_printf("SPI0 Selftest Example Failed\r\n");
        return XST_FAILURE;
    }
    Status = spi1_init();
	if (Status != XST_SUCCESS)
	{
		xil_printf("SPI1 Selftest Example Failed\r\n");
		return XST_FAILURE;
	}
    memset(WriteBuffer,0,1024);

//    read_and_print_all();

    u32 value_cr0 = read_In32(0xe0006000, XSPIPS_CR_OFFSET);
    u32 value_cr1 = read_In32(0xe0007000, XSPIPS_CR_OFFSET);
    printf("cr0:0x%2x; cr1:0x%2x\r\n",value_cr0,value_cr1);

    int count = 0;

    //
//	WriteBuffer[0] = 0x00;
//	WriteBuffer[1] = 0x80;
//	sendValue = 0x8000;
//	SpiWrite(0,sendValue, 2);
//	usleep(200);

    ////写使能, 加这个代码，才会有CS信号的跳变，不然CS没有反应
#if 1
	WriteBuffer[0] = 0x00;
	WriteBuffer[1] = 0xA0;
	sendValue = 0xA000;
	SpiWrite(0,WriteBuffer, 2);
	usleep(200);
	read_and_print_all(0);
#endif

    while(1)
    {
    	if(count++ >= 3)
    		break;
#if 1
		printf("===spi0===\r\n");

		WriteBuffer[0] = 0x02;
		WriteBuffer[1] = 0xa1;
		sendValue = 0xA102;
		SpiWrite(0,sendValue, 3);
		usleep(200);
//		read_and_print_all(0);
		sleep(1);
		WriteBuffer[0] = 0x99;
		WriteBuffer[1] = 0x90;//这个顺序应该是正确的
		sendValue = 0x9000;
		SpiWrite(0,sendValue, 2);

		usleep(2000);

		read_and_print_all(0);
		sleep(1);
#endif

#if 0
		printf("===spi1===\r\n");
		WriteBuffer[0] = 0xA0;
		WriteBuffer[1] = 0x00;
		SpiWrite(1,WriteBuffer, 2);

		usleep(200);

		WriteBuffer[0] = 0xA1;
		WriteBuffer[1] = 0x02;
		SpiWrite(1,WriteBuffer, 2);

		usleep(200);

		WriteBuffer[0] = 0x90;
		WriteBuffer[1] = 0x90;
		SpiWrite(1,WriteBuffer, 2);

		usleep(200);
		read_and_print_all(1);
#endif
    }

    xil_printf("\r\nSuccessfully ran SPI Selftest Example\r\n\r\n");
    return XST_SUCCESS;
}

0 Liushisan 1 年多前回复 Amy Luo

Prodigy 10 points

完整代码如下：

#include "xparameters.h"
#include "xspips.h"
#include "xil_printf.h"
#include "sleep.h"
#include "xspips_hw.h"

XSpiPs Spi0, Spi1;

#define SpiPs_RecvByte(BaseAddress) \
    (u8) XSpiPs_In32((BaseAddress) + XSPIPS_RXD_OFFSET)

#define SpiPs_SendByte(BaseAddress, Data) \
    XSpiPs_Out32((BaseAddress) + XSPIPS_TXD_OFFSET, (Data))

int spi0_init();
void spi0_one_write();
void SpiRead(u8 spiNum, int ByteCount);
void SpiWrite(u8 spiNum, u8 *Sendbuffer, int ByteCount);

unsigned char ReadBuffer[1024];
unsigned char WriteBuffer[1024] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

void read_and_print_all(u8 spiNum)
{
	xil_printf("===========read_and_print_all: %d ========\r\n",spiNum);
	memset(ReadBuffer, 0x00, 1024);
	if(spiNum == 0)
		SpiRead(0,512);
	else
		SpiRead(1,512);
	for (int j = 0; j < 512; j++)
	{
		xil_printf("0x%02x,", ReadBuffer[j]);
	}
	xil_printf("\r\n");
}

static INLINE u32 read_In32(UINTPTR Addr, u32 offset)
{
	return *(volatile u32 *) (Addr+offset);
}

int main(void)
{
    int Status;
    int i, j;
    int value;
    u16 sendValue = 0;
    xil_printf("====SPI Selftest Example =======\r\n");

    Status = spi0_init();
    if (Status != XST_SUCCESS)
    {
        xil_printf("SPI0 Selftest Example Failed\r\n");
        return XST_FAILURE;
    }
    Status = spi1_init();
	if (Status != XST_SUCCESS)
	{
		xil_printf("SPI1 Selftest Example Failed\r\n");
		return XST_FAILURE;
	}
    memset(WriteBuffer,0,1024);

//    read_and_print_all();

    u32 value_cr0 = read_In32(0xe0006000, XSPIPS_CR_OFFSET);
    u32 value_cr1 = read_In32(0xe0007000, XSPIPS_CR_OFFSET);
    printf("cr0:0x%2x; cr1:0x%2x\r\n",value_cr0,value_cr1);

    int count = 0;

    //
//	WriteBuffer[0] = 0x00;
//	WriteBuffer[1] = 0x80;
//	sendValue = 0x8000;
//	SpiWrite(0,sendValue, 2);
//	usleep(200);

    ////写使能, 加这个代码，才会有CS信号的跳变，不然CS没有反应
#if 1
	WriteBuffer[0] = 0x00;
	WriteBuffer[1] = 0xA0;
	sendValue = 0xA000;
	SpiWrite(0,WriteBuffer, 2);
	usleep(200);
	read_and_print_all(0);
#endif

    while(1)
    {
    	if(count++ >= 3)
    		break;
#if 1
		printf("===spi0===\r\n");

		WriteBuffer[0] = 0x02;
		WriteBuffer[1] = 0xa1;
		sendValue = 0xA102;
		SpiWrite(0,sendValue, 3);
		usleep(200);
//		read_and_print_all(0);
		sleep(1);
		WriteBuffer[0] = 0x99;
		WriteBuffer[1] = 0x90;//这个顺序应该是正确的
		sendValue = 0x9000;
		SpiWrite(0,sendValue, 2);

		usleep(2000);

		read_and_print_all(0);
		sleep(1);
#endif

#if 0
		printf("===spi1===\r\n");
		WriteBuffer[0] = 0xA0;
		WriteBuffer[1] = 0x00;
		SpiWrite(1,WriteBuffer, 2);

		usleep(200);

		WriteBuffer[0] = 0xA1;
		WriteBuffer[1] = 0x02;
		SpiWrite(1,WriteBuffer, 2);

		usleep(200);

		WriteBuffer[0] = 0x90;
		WriteBuffer[1] = 0x90;
		SpiWrite(1,WriteBuffer, 2);

		usleep(200);
		read_and_print_all(1);
#endif
    }

    xil_printf("\r\nSuccessfully ran SPI Selftest Example\r\n\r\n");
    return XST_SUCCESS;
}

void SpiRead(u8 spiNum, int ByteCount)
{
	if(spiNum == 0)
	{
		int Count;
		u32 StatusReg;

		StatusReg = XSpiPs_ReadReg(Spi0.Config.BaseAddress,
								   XSPIPS_SR_OFFSET);

		/*
		 * Polling the Rx Buffer for Data
		 */
		do
		{
			StatusReg = XSpiPs_ReadReg(Spi0.Config.BaseAddress,
									   XSPIPS_SR_OFFSET);
		} while (!(StatusReg & XSPIPS_IXR_RXNEMPTY_MASK));

		/*
		 * Reading the Rx Buffer
		 */
		for (Count = 0; Count < ByteCount; Count++)
		{
			ReadBuffer[Count] = SpiPs_RecvByte(
				Spi0.Config.BaseAddress);
		}
	}
	else
	{
		int Count;
		u32 StatusReg;

		StatusReg = XSpiPs_ReadReg(Spi1.Config.BaseAddress,
								   XSPIPS_SR_OFFSET);

		/*
		 * Polling the Rx Buffer for Data
		 */
		do
		{
			StatusReg = XSpiPs_ReadReg(Spi1.Config.BaseAddress,
									   XSPIPS_SR_OFFSET);
		} while (!(StatusReg & XSPIPS_IXR_RXNEMPTY_MASK));

		/*
		 * Reading the Rx Buffer
		 */
		for (Count = 0; Count < ByteCount; Count++)
		{
			ReadBuffer[Count] = SpiPs_RecvByte(
				Spi1.Config.BaseAddress);
		}
	}
}

void SpiWrite(u8 spiNum, u8 *Sendbuffer, int ByteCount)
{
	if(spiNum == 0)
	{
		u32 StatusReg;
		int TransCount = 0;

		StatusReg = XSpiPs_ReadReg(Spi0.Config.BaseAddress,
								   XSPIPS_SR_OFFSET);

		while ((ByteCount > 0) &&
			   (TransCount < XSPIPS_FIFO_DEPTH))
		{
			SpiPs_SendByte(Spi0.Config.BaseAddress,
						   *Sendbuffer);
			Sendbuffer++;
			++TransCount;
			ByteCount--;
		}

		/*
		 * Wait for the transfer to finish by polling Tx fifo status.
		 */
		do
		{
			StatusReg = XSpiPs_ReadReg(
				Spi0.Config.BaseAddress,
				XSPIPS_SR_OFFSET);
		} while ((StatusReg & XSPIPS_IXR_TXOW_MASK) == 0);
	}
	else
	{
		u32 StatusReg;
		int TransCount = 0;

		StatusReg = XSpiPs_ReadReg(Spi1.Config.BaseAddress,
								   XSPIPS_SR_OFFSET);

		while ((ByteCount > 0) &&
			   (TransCount < XSPIPS_FIFO_DEPTH))
		{
			SpiPs_SendByte(Spi1.Config.BaseAddress,
						   *Sendbuffer);
			Sendbuffer++;
			++TransCount;
			ByteCount--;
		}

		/*
		 * Wait for the transfer to finish by polling Tx fifo status.
		 */
		do
		{
			StatusReg = XSpiPs_ReadReg(
				Spi1.Config.BaseAddress,
				XSPIPS_SR_OFFSET);
		} while ((StatusReg & XSPIPS_IXR_TXOW_MASK) == 0);
	}
}
s32 XSpiPs_SetSlaveSelect(XSpiPs *InstancePtr, u8 SlaveSel);
int spi0_init()
{
    int Status;
    XSpiPs_Config *SpiConfig;

    /*
     * Initialize the SPI device.
     */
    SpiConfig = XSpiPs_LookupConfig(XPAR_XSPIPS_0_DEVICE_ID);
    if (NULL == SpiConfig)
    {
        return XST_FAILURE;
    }

    Status = XSpiPs_CfgInitialize(&Spi0, SpiConfig, SpiConfig->BaseAddress);
    if (Status != XST_SUCCESS)
    {
        return XST_FAILURE;
    }

    /*
     * Perform a self-test to check hardware build.
     */
    Status = XSpiPs_SelfTest(&Spi0);
    if (Status != XST_SUCCESS)
    {
        return XST_FAILURE;
    }
    xil_printf("%s self test succ\r\n", __func__);

    Status = XSpiPs_SetOptions(&Spi0, XSPIPS_FORCE_SSELECT_OPTION |XSPIPS_MASTER_OPTION);
    if (Status != XST_SUCCESS)
    {
        xil_printf("%s XSpiPs_SetOptions fail\r\n", __func__);
        return XST_FAILURE;
    }
    Status = XSpiPs_SetClkPrescaler(&Spi0, XSPIPS_CLK_PRESCALE_64);
    if (Status != XST_SUCCESS)
    {
        xil_printf("%s XSpiPs_SetClkPrescaler fail\r\n", __func__);
        return XST_FAILURE;
    }

    //lsh
#if 0
    XSpiPs_SetSlaveSelect(&Spi0,0);
	if (Status != XST_SUCCESS)
	{
		xil_printf("%s XSpiPs_SetSlaveSelect fail\r\n", __func__);
		return XST_FAILURE;
	}

#endif
    XSpiPs_Enable(&Spi0);
    xil_printf("spi 0 config finish\r\n");
    return XST_SUCCESS;
}


int spi1_init()
{
    int Status;
    XSpiPs_Config *SpiConfig;

    /*
     * Initialize the SPI device.
     */
    SpiConfig = XSpiPs_LookupConfig(XPAR_XSPIPS_1_DEVICE_ID);
    if (NULL == SpiConfig)
    {
        return XST_FAILURE;
    }

    Status = XSpiPs_CfgInitialize(&Spi1, SpiConfig, SpiConfig->BaseAddress);
    if (Status != XST_SUCCESS)
    {
        return XST_FAILURE;
    }

    /*
     * Perform a self-test to check hardware build.
     */
    Status = XSpiPs_SelfTest(&Spi1);
    if (Status != XST_SUCCESS)
    {
        return XST_FAILURE;
    }
    xil_printf("%s self test succ\r\n", __func__);
#if 1
    Status = XSpiPs_SetOptions(&Spi1, XSPIPS_MASTER_OPTION);
    if (Status != XST_SUCCESS)
    {
        xil_printf("%s XSpiPs_SetOptions fail\r\n", __func__);
        return XST_FAILURE;
    }
    Status = XSpiPs_SetClkPrescaler(&Spi1, XSPIPS_CLK_PRESCALE_64);
    if (Status != XST_SUCCESS)
    {
        xil_printf("%s XSpiPs_SetClkPrescaler fail\r\n", __func__);
        return XST_FAILURE;
    }
#endif
    XSpiPs_Enable(&Spi1);
    xil_printf("spi 1 config finish\r\n");
    return XST_SUCCESS;
}

0 Amy Luo 1 年多前回复 Liushisan

TI__Guru**** 185470 points

我刚注意到 TLV2548产品首页的状态标黄了，即此产品已经停产了，请知晓这一点：

Liushisan 说：
这个问题能确定是由spi master controler出现了问题是吗？

基本可以确定是spi master的问题，因为TLV2548 的时钟信号是输入，但保险起见建议做以下测试：

spi master 与 TLV2548 时钟信号之间有电阻吗？有的话，建议去掉电阻即悬空master 时钟输出看下master 时钟是否有输出，这样就排除了TLV2548 对此信号的影响。或直接焊掉TLV2548 芯片去测试。

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TLV2548: 不能正确获取CFR值