灵动微MM32F013x芯片学习-ADC

只看该作者 · 2022-7-28 23:13

MM32F013x的ADC还是蛮好用的，每一个ADC通道都有一个自己的结果寄存器。当启用连续转换模式时，ADC就可以自动更新转换结果到各自的结果寄存器，用户只需要直接读取结果寄存器即可，省去很多麻烦。由于ADC最快转换时间仅为1us，即使10个通道全部转换一次的时间也只有10us，对于一般的控制也是足够用的。还记得当初使用NXP芯片时，只有一个结果寄存器，每次都要修改转换通道，等待转换，而且还要考虑函数的可重入性问题，甚是麻烦，而且也会浪费cpu的时间资源。灵动微的这点做的还是不错。下面就上代码：

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void adc_init(void)

{

    //init pin mux

    RCC->AHBENR |= RCC_AHBENR_GPIOA; //enable GPIOA clock

    RCC->AHBENR |= RCC_AHBENR_GPIOB; //enable GPIOB clock

    

    GPIOA->CRL =0;// A0-A7->AD

    GPIOB->CRL &=  ~(GPIO_CNF_MODE_MASK << GPIO_CRL_CNF_MODE_0_Pos);//B0->ADIN8

    GPIOB->CRL |= GPIO_CNF_MODE_AIN << GPIO_CRL_CNF_MODE_0_Pos;

    GPIOB->CRL &=  ~(GPIO_CNF_MODE_MASK << GPIO_CRL_CNF_MODE_1_Pos);//B1->ADIN9

    GPIOB->CRL |= GPIO_CNF_MODE_AIN << GPIO_CRL_CNF_MODE_1_Pos;





    //init adc

    RCC->APB2ENR |= RCC_APB2ENR_ADC1EN; //enableADC1clock



    RCC->APB2RSTR |= RCC_APB2RSTR_ADC1RST; //ADC1reset

    RCC->APB2RSTR &= ~(RCC_APB2RSTR_ADC1RST); //reset   end





    ADC1->ADCFG |= ADCFG_ADCPRE_3; // 3 fractional frequency

    ADC1->ADCR |= ADCR_ADMD_CONTINUE;// continue mode

    ADC1->ADCR |= ADCR_ALIGN_RIGHT; //right-justified





    //enable channel

    ADC1->ADCHS |= ADCHS_CHEN0; //enable channel 0    

    ADC1->ADCHS |= ADCHS_CHEN1; //enable channel 1

    ADC1->ADCHS |= ADCHS_CHEN2; //enable channel 2

    ADC1->ADCHS |= ADCHS_CHEN3; //enable channel 3

    ADC1->ADCHS |= ADCHS_CHEN4; //enable channel 4

    ADC1->ADCHS |= ADCHS_CHEN5; //enable channel 5

    ADC1->ADCHS |= ADCHS_CHEN6; //enable channel 6

    ADC1->ADCHS |= ADCHS_CHEN7; //enable channel 7

    ADC1->ADCHS |= ADCHS_CHEN8; //enable channel 8

    ADC1->ADCHS |= ADCHS_CHEN9; //enable channel 9

    //ADC1->ADCHS |= ADCHS_CHENTS; //enable channel TS

    //ADC1->ADCHS |= ADCHS_CHENVS; //enable channel VS



    ADC1->ADCFG |= ADCFG_ADEN;//ADC1enable

    ADC1->ADCR |= ADCR_ADST;//Start Conversion

}