AFE4490寄存器配置成功后如何判断该芯片正常工作。

Hi Kuang，

   你用的是开发板？

   你可以参考一下开发板的使用指南。

自己布的板子 这款芯片只需要配置寄存器就好了么？可是配置好寄存器后板子没有反应

你好啊！！我最近也在用这颗芯片做毕业设计~~板子也是自己画的，然后我自己写了SPI的程序后读写寄存器没有成功，因为读出来的数据一直是0。

我现在不知道是我的硬件有问题还是程序有问题，所以可不可以给你读写寄存器的程序我参考一些啊。。。。。或者我们可以讨论一下。万分感谢啊，，，，，

我再贴上我的程序，能帮我看看有什么问题么

//spi WRITE a byte.
void SPI_WRITE_BYTE(int data)
{
int i;
for(i=0;i<8;i++){
if(data&0x80)SIMO->DATA=1;
else SIMO->DATA=0;
usleep(10); //set up time
SCLK->DATA=1;
data<<=1;
usleep(10); //hold time
SCLK->DATA=0;
}
}

//SPI read a byte
char SPI_READ_BYTE()
{
int i;
char data;
data=0;
for(i=0;i<8;i++){
data<<=1;
SCLK->DATA=1;
usleep(10);
data |=SOMI->DATA;
// printf("the SOMI is %d \n",SOMI->DATA);
SCLK->DATA=0;
usleep(10);
}
SIMO->DATA=0;
return(data);
}

//addr is a byte,but value is a 24-bit data
void SPI_WRITE_REG(int addr,int value)
{
int value1,value2;
STE->DATA=0;
usleep(1);
SPI_WRITE_BYTE(addr);
printf("The written addr is %d \n",addr);
value1=value>>16;
printf("value1 is %d \n",value1);
SPI_WRITE_BYTE(value1);
value2=value>>8;
printf("value2 is %d \n",value2);
SPI_WRITE_BYTE(value2);
printf("value is %d \n",value);
SPI_WRITE_BYTE(value);
usleep(1);
STE->DATA=1;
}

//READ THE REGISTER
int SPI_READ_REG(int addr)
{
int value=0;
STE->DATA=0;
usleep(1);
SPI_WRITE_BYTE(addr);
printf("the read addr is %d \n",addr);
value |=SPI_READ_BYTE();
printf("the 1 read value is %d \n",SPI_READ_BYTE());
value<<=8;
printf("the 2 read value is %d \n",value);
value |=SPI_READ_BYTE();
printf("the 3 read value is %d \n",SPI_READ_BYTE());
value<<=8;
printf("the 4 read value is %d \n",value);
value |=SPI_READ_BYTE();
printf("the 5 read value is %d \n",SPI_READ_BYTE());
usleep(1);
STE->DATA=1;
return(value);
}

请问下你哪个问题解决了吗？

请问下是那个寄存器?

PRPCOUNT中的Bit D8 时钟使能

你好  这是PRPCOUNT寄存器的介绍？PRPCOUNT[15:0] ；The contents of this register can be used to set the pulse repetition period (in number of
clock cycles of the 4-MHz clock). The PRPCOUNT value must be set in the range of 800 to
64000. Values below 800 do not allow sufficient sample time for the four samples; see the
Electrical Characteristics table.   

sorry，看错行了，PRCOUNT的下一个寄存器CONTROL1的D8

你是碰到了什么问题呀？

问题是：配置数据能够正常读出，ALED2VAL，LED2VAL，LED1VAL，ALED2VAL没有数据。TXM,TXP没有发送波形？

不清楚硬件那里出问题了。测了几个点的电压挺正常的

给你一个我用的正常的配置参数，只要你的时序是正确的，应该没什么问题

unsigned long code RegVal_4490[50] = {
0, //0
0x001770, //1
0x001f3f, //2
0x001770, //3
0x001F3E, //4
0, //5
0x0007ce, //6
0x0007d0, //7
0x000f9e, //8
0x0007d0, //9
0x000f9f, //A
0x000fa0, //B
0x00176e, //C
0x000002, //D
0x0007cf, //E
0x0007d2, //F
0x000f9f, //10
0x000fa2, //11
0x00176f, //12
0x001772, //13
0x001f3f, //14
0, //15
0x000002, //16
0x0007d0, //17
0x0007d2, //18
0x000fa0, //19
0x000fa2, //1A
0x001770, //1B
0x001772, //1C
0x001f3f, //1D
0x000103, //1E
0, //1F
0, //20
0x4400, //21
0x011414, //22
0, //23
0, //24
0, //25
0, //26
0, //27
0, //28
0, //29
0, //2A
0, //2B
0, //2C
0, //2D
0, //2E
0, //2F
0, //30

}

怀疑是晶振问题，用示波器看4M波形没有输出？