STM32平臺完成一次ADC芯片的編程的過程對于一個菜鳥來說實在可怕 Power-up;
Delayto allow power supplies to settle and power-up reset to complete (minimum of 50µs);
Configurethe SPI interface of the stm32 to SPI mode 1 (CPOL = 0, CPHA = 1);
Ifthe CS pin is not tied low permanently, configure the stm32 GPIO connected toCS as an
output;
Configurethe stm32 GPIO connected to the DRDY pin as a falling edge triggered interrupt
input;
SetCS to the device low;
Delayfor a minimum of td(CSSC);
Sendthe RESET command (06h) to make sure the device is properly reset afterpower-up;
Delayfor a minimum of 50 µs + 32 · t(CLK);
Writethe respective register configuration with the WREG command (43h, 08h, 04h,10h, and 00h);
Asan optional sanity check, read back all configuration registers with the RREGcommand (23h);
Sendthe START/SYNC command (08h) to start converting in continuous conversion mode;
Delayfor a minimum of td(SCCS);
ClearCS to high (resets the serial interface);
Loop
{
Waitfor DRDY to transition low;
TakeCS low;
Delayfor a minimum of td(CSSC);
Send24 SCLK rising edges to read out conversion data on DOUT/DRDY;
Delayfor a minimum of td(SCCS);
ClearCS to high;
}
TakeCS low;
Delayfor a minimum of td(CSSC);
Sendthe POWERDOWN command (02h) to stop conversions and put the device in power-downmode;
Delayfor a minimum of td(SCCS);
ClearCS to high; 附錄一個菜鳥初次編程的ADC
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