ADS1258配置寄存器不成功，读配置寄存器失败，芯片默认工作

各位大神，请帮忙分析下ADS1258配置寄存器不成功问题

上电程序如下

// initialize the device
SYSTEM_Initialize();

INTERRUPT_GlobalInterruptEnable();

INTERRUPT_PeripheralInterruptEnable();

SPI_CS = 1;
ADS_1258_START = 0;
ADS_1258_RESET = 0;
ADS_1258_PWDN = 0;
delay_ms(50);
ADS_1258_RESET = 1;
delay_ms(5);
SPI_CS = 0;
SPI_read = SPI_Exchange8bit(0x70);
SPI_read = SPI_Exchange8bit(0x2A);
SPI_read = SPI_Exchange8bit(0x03);
SPI_read = SPI_Exchange8bit(0x00);
SPI_read = SPI_Exchange8bit(0x00);
SPI_read = SPI_Exchange8bit(0x3F);
SPI_read = SPI_Exchange8bit(0x00);
SPI_read = SPI_Exchange8bit(0x00);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0x00);

SPI_CS = 1;
delay_ms(100);
SPI_CS = 0;
SPI_read = SPI_Exchange8bit(0x50);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);
SPI_read = SPI_Exchange8bit(0xFF);

SPI_CS = 1;
delay_ms(100);
ADS_1258_PWDN = 1;
ADS_1258_START = 1;

while (1)
{
// Add your application code
while(ADS_1258_DRDY);
SPI_CS = 0;
ADS1258_data[0] = SPI_Exchange8bit(0xFF);
ADS1258_data[1] = SPI_Exchange8bit(0xFF);
ADS1258_data[2] = SPI_Exchange8bit(0xFF);
ADS1258_data[3] = SPI_Exchange8bit(0xFF);
SPI_CS = 1;
}

ADS1258原理图

新建 Microsoft Word 文档.docx

hen wu：

ADS1258写完寄存器后再读出全部为0x00,芯片上电默认是可以工作的，就是芯片默认配置，16个通道全速采样

hen wu：

ADS1258上电后读写配置寄存器失败后，进入while循环可以默认工作状态下工作，即ADS1258上电默认配置 16个通道都采集数据，我们实际用6个通道采集。

hen wu：

回复 hen wu:

放大2

放大1f

放大3

Mickey Zhang：

回复 hen wu:

确认下参考电压是否稳定，建议您可以通过ADS1258EVM来调试：www.ti.com/…/ads1258evm-pdk

hen wu：

回复 Mickey Zhang:

参考电压稳定，外部LDO供电，我们现在只是对配置寄存器读写不了，读也不行，写也不行，有参考例程吗？

hen wu：

回复 Mickey Zhang:

还请帮忙再看一下

Kailyn Chen：

回复 hen wu:

很抱歉，没有参考例程。
写入寄存器之后，不要立即去读，给一个等待时间再读取试试？
另外，更换一片新的IC再试试？

user5300245：

回复 hen wu:

你好，你这个问题解决了吗？我也遇到这种情况。