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ADS1158读寄存器问题

yanhui huang
Prodigy 50 points
Other Parts Discussed in Thread: ADS1158

请教问题

用TMS320C6726的SPI1口控制ADS1158，AVDD=5V，DVDD=3.3V，VREP=5V，VREN=0V。CLKIO=16MHz.

START恒0，PDWN恒1

问题：初始化写寄存器后（寄存器分别为40,01,00，00，ff，ff，00,00,00），读ADS1158寄存器内容都为零 ，请高手指教，多谢