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 ,1=0 V to REF IN
#define SPI_AD7908_CODING(n) (n<<0)//0=twos complement ,1=binary
void SPI_AD7908_Init(void)
{
nrf_gpio_cfg_output(AD7908_SCLK);
nrf_gpio_cfg_output(AD7908_DIN);
nrf_gpio_cfg_output(AD7908_CS);
nrf_gpio_cfg_input(AD7908_DOUT,NRF_GPIO_PIN_NOPULL);
}
uint16_t SPI_AD7908_Write_Control(bool writeread)
{
uint16_t dat_16 = 0;
if(writeread == 1)//write
{
dat_16 = SPI_AD7908_WRITE(writeread) | \
SPI_AD7908_ADD(5) | \
SPI_AD7908_PM(3) | \
SPI_AD7908_SEQ(1) | \
SPI_AD7908_SHADOW(1) | \
SPI_AD7908_RANGE(1) | \
SPI_AD7908_CODING(1);
}
else//read
{
dat_16 = SPI_AD7908_WRITE(writeread) | \
SPI_AD7908_ADD(5) | \
SPI_AD7908_PM(3) | \
SPI_AD7908_SEQ(1) | \
SPI_AD7908_SHADOW(1) | \
SPI_AD7908_RANGE(1) | \
SPI_AD7908_CODING(1);
}
dat_16 <<= 4;
return dat_16;
}
uint8_t SPI_AD7908_Read(void)
{
uint8_t dat;
uint16_t dat_buf;
SPI_AD7908__Disable_CS;
SPI_AD7908__Set_SCLK;
nrf_delay_us(2);
SPI_AD7908__Enable_CS;
for(uint8_t i=0;i<16;i++)
{
nrf_delay_us(2);
dat_buf<<=1;
SPI_AD7908__Set_SCLK;
if(SPI_AD7908__Get_DOUT)
{
dat_buf |= 0x0001;
}
else
{
dat_buf &= 0xfffe;
}
SPI_AD7908__Clr_SCLK;
}
dat_buf >>= 4;
dat = (uint8_t)dat_buf;
SPI_AD7908__Disable_CS;
return dat;
}
void SPI_AD7908_Read_more(uint8_t nchannel,uint8_t* pbuff)
{
uint16_t dat_buf;
for(uint8_t j=0;j
{
SPI_AD7908__Disable_CS;
SPI_AD7908__Set_SCLK;
nrf_delay_us(2);
SPI_AD7908__Enable_CS;
for(uint8_t i=0;i<16;i++)
{
nrf_delay_us(2);
dat_buf<<=1;
SPI_AD7908__Set_SCLK;
if(SPI_AD7908__Get_DOUT)
{
dat_buf |= 0x0001;
}
else
{
dat_buf &= 0xfffe;
}
SPI_AD7908__Clr_SCLK;
}
dat_buf >>= 4;
pbuff[j] = (uint8_t)dat_buf;
SPI_AD7908__Disable_CS;
nrf_delay_us(2);
}
}
void SPI_AD7908_Write(uint16_t dat)
{
SPI_AD7908__Disable_CS;
SPI_AD7908__Set_SCLK;
nrf_delay_us(2);
SPI_AD7908__Enable_CS;
for(uint8_t i=0;i<16;i++)
{
nrf_delay_us(2);
SPI_AD7908__Set_SCLK;
if(dat & 0x8000)
{
SPI_AD7908__Set_DIN;
}
else
{
SPI_AD7908__Clr_DIN;
}
SPI_AD7908__Clr_SCLK;
dat <<= 1;
}
SPI_AD7908__Disable_CS;
nrf_delay_us(2);
}
void ADC_to_Vout(uint16_t i)
{
vout[0][i] = (uint16_t)buff[0]*2500/256;
vout[1][i] = (uint16_t)buff[1]*2500/256;
vout[2][i] = (uint16_t)buff[2]*2500/256;
vout[3][i] = (uint16_t)buff[3]*2500/256;
vout[4][i] = (uint16_t)buff[4]*2500/256;
vout[5][i] = (uint16_t)buff[5]*2500/256;
}