UBOOT ADC 驱动流程

static inline
int xn_voltage_probe(struct xn_tool *tool)
{
    int adc_value = 0;
    int i = 0;

    printf("\nVoltage Probe:\n");

    gpio_set_pin(S3C_GPN5, S3C_GPN5_INP);
    gpio_pullup(S3C_GPN5, 0x2);
    
    
    if(gpio_get_value(S3C_GPN5) == 0)
        printf("EXTERNAL_POWER.......................................[YES]\n");
    else
        printf("EXTERNAL_POWER.......................................[NO]\n");


while(i++ < 10)

{    adc_value = get_adc_i(1);

    

    printf("BATTERY_VOLTAGE......................................[%u mv]\n",(unsigned int)(adc_value * VOLTAGE_FACTOR));

}

    wait_user_ack(tool);
    return 0;
}

static inline
int get_adc_i(int channel)
{
    volatile S3C2410_ADC * reg_adc = S3C2410_GetBase_ADC();

    reg_adc->ADCCON     = (1<<14) | (49<< 6) | (channel<<3);
    reg_adc->ADCDLY        = 40000;
    reg_adc->ADCCON     |= (1 << 0);

    while(reg_adc->ADCCON & 0x1);
    while (!(reg_adc->ADCCON & (1 << 15)));
    
    return (0x3ff & reg_adc->ADCDAT0);
}