问如何使用带有Raspberry Pi的ADC实现高采样速度？

EN

#include <stdio.h>
#include <time.h>
#include <bcm2835.h>

int main(int argc, char**argv) {
    FILE *f_0 = fopen("adc_test.dat", "w");
    clock_t start, end;
    double time_taken;

    if (!bcm2835_init()) {
        return 1;
    }

    bcm2835_spi_begin();
    bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST);
    bcm2835_spi_setDataMode(BCM2835_SPI_MODE0);
    bcm2835_spi_setClockDivider(32);
    bcm2835_spi_chipSelect(BCM2835_SPI_CS0);
    bcm2835_spi_setChipSelectPolarity(BCM2835_SPI_CS0, LOW);
    int i;
    char buf_[0] = {0x01, (0x08|0)<<4, 0x00}; // really doesn't matter what this is
    char readBuf_0[2];
    start = clock();
    for (i=0; i<380000; i++) {
        bcm2835_spi_transfernb(buf_0, readBuf_0, 2);
        fprintf(f_0, "%d\n", (readBuf_0[0]<<6) + (readBuf_0[1]>>2));
    }
    end = clock();
    time_taken = ((double)(end-start)/CLOCKS_PER_SEC);
    printf("%f", (double)(time_taken));
    printf(" seconds \n");
    bcm2835_spi_end();
    bcm2835_close();
    return 0;
}