TLV2548: 不能正确获取CFR值

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？

Amy Luo：

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？

,

Liushisan：

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 1WriteBuffer[0] = 0x00;WriteBuffer[1] = 0xA0;sendValue = 0xA000;SpiWrite(0,WriteBuffer, 2);usleep(200);read_and_print_all(0);
#endifwhile(1){if(count++ >= 3)break;
#if 1printf("===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 0printf("===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;
}

,

Liushisan：

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);elseSpiRead(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 1WriteBuffer[0] = 0x00;WriteBuffer[1] = 0xA0;sendValue = 0xA000;SpiWrite(0,WriteBuffer, 2);usleep(200);read_and_print_all(0);
#endifwhile(1){if(count++ >= 3)break;
#if 1printf("===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 0printf("===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 0XSpiPs_SetSlaveSelect(&Spi0,0);if (Status != XST_SUCCESS){xil_printf("%s XSpiPs_SetSlaveSelect fail\r\n", __func__);return XST_FAILURE;}#endifXSpiPs_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 1Status = 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;}
#endifXSpiPs_Enable(&Spi1);xil_printf("spi 1 config finish\r\n");return XST_SUCCESS;
}

,

Amy Luo：

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。