AD7908

6通道，自动。

#define AD7908_SCLK 13

#define AD7908_DIN 12

#define AD7908_CS 11

#define AD7908_DOUT 14

//SPI hardware fuction

#define    SPI_AD7908__Enable_CS     nrf_gpio_pin_clear(AD7908_CS) 

#define    SPI_AD7908__Disable_CS   nrf_gpio_pin_set(AD7908_CS)

#define    SPI_AD7908__Set_SCLK     nrf_gpio_pin_set(AD7908_SCLK)

#define    SPI_AD7908__Clr_SCLK     nrf_gpio_pin_clear(AD7908_SCLK)

#define    SPI_AD7908__Set_DIN       nrf_gpio_pin_set(AD7908_DIN)

#define    SPI_AD7908__Clr_DIN       nrf_gpio_pin_clear(AD7908_DIN)

#define    SPI_AD7908__Get_DOUT       nrf_gpio_pin_read(AD7908_DOUT)

#define SPI_AD7908_WRITE(n) (n<<11) //0=read 1=write

#define SPI_AD7908_ADD(n) (n<<6) //n:0~7

#define SPI_AD7908_PM(n) (n<<4) //n:0~3

#define SPI_AD7908_SEQ(n) (n<<10)

#define SPI_AD7908_SHADOW(n) (n<<3)

#define SPI_AD7908_RANGE(n) (n<<1)//0=0 V to 2*REF IN ,