small_water_meter_4g_src/Drivers/Board/adc_drv.c

 
#include "board.h"

void adc_init(void)
{
    // PC00 : AIN10 for CELL = VBAT/2
    GpioInit(PC00_AF0, GPIO_ANA);

    // PC01 : CELL_EN, power 0:off; 1:on;
    GpioInit(PC01_AF0, GPIO_DIG_OUT_WEAK_PUSH_NONEUP_NONEDOWN);
    GpioClrPins(GpioPortC, GpioBitMsk1);   // power off CELL_EN
}

//float McuTemp;
//uint16_t McuVcc;    // unit mV
//uint16_t McuVbat;   // unit mV

volatile float McuTemp;
volatile uint16_t McuVcc;    // unit mV
volatile uint16_t McuVbat;   // unit mV
//volatile uint16_t McuVTxbat;   // unit mV
volatile float WaterPressure = 0.0f; // unit MPa

void adc_get(void)
{
    uint16_t ADC_DATA;

    PeriClk_MutEnable(PeriClk_AdcBgr);

    // cfg BGR after ADC clk en
    M0P_BGR->CR = (1u<<1) |     // TS_EN, 0:disable; 1:enable temp sensor
                  (1u<<0);      // BGR_EN, 0:disable; 1:enable BGR

    M0P_ADC->CR1 = (0<<11) |    // RAccEn, accumulate result 0:disable; 1:enable;
                   (1<<10) |    // Mode,  0:single convert; 1:continuous convert;
                   (0<<9)  |    // Injected convert DMA En,  0:close; 1:open;
                   (0<<8)  |    // sequence convert DMA En,  0:close; 1:open;
                   (0<<2);      // Align, ADC result 0:right align; 1:left align;
    
    M0P_ADC->CR0 = (0<<15) |    // IE, interrupt 0:disable; 1:enable;
                   (1<<14) |    // InRefEn, internal reference 0:disable; 1:enable(0.5mA Current);
                   (3<<12) |    // SAM, 0:4; 1:6; 2:8; 3:12 sample clocks
                   (1<<11) |    // BUF, input buffer 0:close; 1:open(0.6mA Current);
                   (1<<9)  |    // REF, 0:1.5V InRef; 1:2.5V InRef; 2:ExRef(PB01); 3:AVCC;
                   (3<<2)  |    // CKDiv, 0:PCLK; 1:PCLK/2; 2:PCLK/4; 3:PCLK/8;
                   (1<<0);      // ADCEN, 0:close; 1:open;
    M0P_ADC->ICR = 0x0u;    // clear flag

//    M0P_ADC->JQR = ( 1u<<20) |  // CNT, 
//                   ( 0u<<15) |  // CH3Mux
//                   ( 0u<<10) |  // CH2Mux
//                   (27u<< 5) |  // CH1Mux, 27:AVCC/3; 28:Temp 
//                   (28u<< 0);   // CH0Mux, 27:AVCC/3; 28:Temp

    M0P_ADC->SQR2 = (15u<<20) |  // CNT, 
                    (10u<<15) |  // CH15Mux, 10:AIN10; 27:AVCC/3; 28:Temp 
                    (27u<<10) |  // CH14Mux, 10:AIN10; 27:AVCC/3; 28:Temp 
                    (10u<< 5) |  // CH13Mux, 10:AIN10; 27:AVCC/3; 28:Temp 
                    (28u<< 0);   // CH12Mux, 10:AIN10; 27:AVCC/3; 28:Temp
    M0P_ADC->SQR1 = (27u<<25) |  // CH11Mux, 10:AIN10; 27:AVCC/3; 28:Temp 
                    (10u<<20) |  // CH10Mux, 10:AIN10; 27:AVCC/3; 28:Temp 
                    (27u<<15) |  // CH9Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (28u<<10) |  // CH8Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (10u<< 5) |  // CH7Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (27u<< 0);   // CH6Mux,  10:AIN10; 27:AVCC/3; 28:Temp
    M0P_ADC->SQR0 = (10u<<25) |  // CH5Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (28u<<20) |  // CH4Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (27u<<15) |  // CH3Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (10u<<10) |  // CH2Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (27u<< 5) |  // CH1Mux,  10:AIN10; 27:AVCC/3; 28:Temp 
                    (28u<< 0);   // CH0Mux,  10:AIN10; 27:AVCC/3; 28:Temp

    GpioSetPins(GpioPortC, GpioBitMsk1);   // power on CELL_EN

    us_delay(20);  // wait 20us for BGR stable

//    M0P_ADC->JQRSTART = (1<<0);    // start, 0:none; 1:start JQR convert
//    while(M0P_ADC->IFR_f.JQRIF==0){
//        // wait until end of convert
//    }
    M0P_ADC->SQRSTART = (1<<0);    // start, 0:none; 1:start SQR convert
    while(M0P_ADC->IFR_f.SQRIF==0){
        // wait until end of convert
    }
    GpioClrPins(GpioPortC, GpioBitMsk1);   // power off CELL_EN

//    ADC_Volt = M0P_ADC->JQRRESULT1;
//    ADC_Temp = M0P_ADC->JQRRESULT0;

    ADC_DATA  = M0P_ADC->SQRRESULT0;
    ADC_DATA += M0P_ADC->SQRRESULT4;
    ADC_DATA += M0P_ADC->SQRRESULT8;
    ADC_DATA += M0P_ADC->SQRRESULT12;
    ADC_DATA = ADC_DATA>>2;

    McuTemp = (ADC_DATA - *((uint16_t *)0x00100C36u))*(2.5f*0.0795f)+25.0f;

    ADC_DATA  = M0P_ADC->SQRRESULT1;
    ADC_DATA += M0P_ADC->SQRRESULT3;
    ADC_DATA += M0P_ADC->SQRRESULT6;
    ADC_DATA += M0P_ADC->SQRRESULT9;
    ADC_DATA += M0P_ADC->SQRRESULT11;
    ADC_DATA += M0P_ADC->SQRRESULT14;

    McuVcc  = (((uint32_t)ADC_DATA)*(2500*3/6))>>12;

    ADC_DATA  = M0P_ADC->SQRRESULT2;
    ADC_DATA += M0P_ADC->SQRRESULT5;
    ADC_DATA += M0P_ADC->SQRRESULT7;
    ADC_DATA += M0P_ADC->SQRRESULT10;
    ADC_DATA += M0P_ADC->SQRRESULT13;
    ADC_DATA += M0P_ADC->SQRRESULT15;

    McuVbat = (uint16_t)(((float)ADC_DATA)*(2500.0f*2/6/4096));

    M0P_ADC->ICR = 0x0u;    // clear flag

    M0P_ADC->CR0 &= ~(1<<0);      // ADCEN, 0:close; 1:open;

    M0P_BGR->CR = (0u<<1) |     // TS_EN, 0:disable; 1:enable temp sensor
                  (0u<<0);      // BGR_EN, 0:disable; 1:enable BGR

    PeriClk_MutDisable(PeriClk_AdcBgr);
}