#define HC165_CE {PBout(0),PBout(8),PEout(4),PEout(8),PEout(12)} #define HC165_PL {PAout(11),PBout(6),PEout(2),PEout(6),PEout(10)} #define HC165_CP {PAout(12),PBout(7),PEout(3),PEout(11),PEout(11)} #define HC165_Q7 {PBin(1),PBin(9),PEin(5),PEin(9),PEin(13)} uint8_t readVoltage(int group) { uint8_t i = 0; uint8_t temp = 0; HC165_CE[group] = 0; HC165_PL[group] = 0; HC165_PL[group] = 1; if(HC165_Q7[group] == 1) temp |= 0x01; for(i = 0; i < 7; i ++) { temp = temp << 1; HC165_CP[group] = 0; delayUs(1); HC165_CP[group] = 1; if(HC165_Q7[group] == 1) temp |= 0x01; } return temp; } 请帮我改成纯C语言代码

以下是改成纯 C 语言代码后的代码：

#define HC165_CE_0  GPIOB->ODR &= ~(1 << 0)
#define HC165_CE_1  GPIOB->ODR &= ~(1 << 8)
#define HC165_CE_2  GPIOE->ODR &= ~(1 << 4)
#define HC165_CE_3  GPIOE->ODR &= ~(1 << 8)
#define HC165_CE_4  GPIOE->ODR &= ~(1 << 12)
#define HC165_PL_0  GPIOA->ODR &= ~(1 << 11)
#define HC165_PL_1  GPIOB->ODR &= ~(1 << 6)
#define HC165_PL_2  GPIOE->ODR &= ~(1 << 2)
#define HC165_PL_3  GPIOE->ODR &= ~(1 << 6)
#define HC165_PL_4  GPIOE->ODR &= ~(1 << 10)
#define HC165_CP_0  GPIOA->ODR &= ~(1 << 12)
#define HC165_CP_1  GPIOB->ODR &= ~(1 << 7)
#define HC165_CP_2  GPIOE->ODR &= ~(1 << 3)
#define HC165_CP_3  GPIOE->ODR &= ~(1 << 11)
#define HC165_CP_4  GPIOE->ODR &= ~(1 << 15)
#define HC165_Q7_0  GPIOB->IDR & (1 << 1)
#define HC165_Q7_1  GPIOB->IDR & (1 << 9)
#define HC165_Q7_2  GPIOE->IDR & (1 << 5)
#define HC165_Q7_3  GPIOE->IDR & (1 << 9)
#define HC165_Q7_4  GPIOE->IDR & (1 << 13)

uint8_t readVoltage(int group)
{
    uint8_t i = 0;
    uint8_t temp = 0;
    switch (group) {
        case 0:
            HC165_CE_0 = 0;
            HC165_PL_0 = 0;
            HC165_PL_0 = 1;
            if (HC165_Q7_0 == 1)
                temp |= 0x01;
            for (i = 0; i < 7; i++) {
                temp = temp << 1;
                HC165_CP_0 = 0;
                delayUs(1);
                HC165_CP_0 = 1;
                if (HC165_Q7_0 == 1)
                    temp |= 0x01;
            }
            break;
        case 1:
            HC165_CE_1 = 0;
            HC165_PL_1 = 0;
            HC165_PL_1 = 1;
            if (HC165_Q7_1 == 1)
                temp |= 0x01;
            for (i = 0; i < 7; i++) {
                temp = temp << 1;
                HC165_CP_1 = 0;
                delayUs(1);
                HC165_CP_1 = 1;
                if (HC165_Q7_1 == 1)
                    temp |= 0x01;
            }
            break;
        case 2:
            HC165_CE_2 = 0;
            HC165_PL_2 = 0;
            HC165_PL_2 = 1;
            if (HC165_Q7_2 == 1)
                temp |= 0x01;
            for (i = 0; i < 7; i++) {
                temp = temp << 1;
                HC165_CP_2 = 0;
                delayUs(1);
                HC165_CP_2 = 1;
                if (HC165_Q7_2 == 1)
                    temp |= 0x01;
            }
            break;
        case 3:
            HC165_CE_3 = 0;
            HC165_PL_3 = 0;
            HC165_PL_3 = 1;
            if (HC165_Q7_3 == 1)
                temp |= 0x01;
            for (i = 0; i < 7; i++) {
                temp = temp << 1;
                HC165_CP_3 = 0;
                delayUs(1);
                HC165_CP_3 = 1;
                if (HC165_Q7_3 == 1)
                    temp |= 0x01;
            }
            break;
        case 4:
            HC165_CE_4 = 0;
            HC165_PL_4 = 0;
            HC165_PL_4 = 1;
            if (HC165_Q7_4 == 1)
                temp |= 0x01;
            for (i = 0; i < 7; i++) {
                temp = temp << 1;
                HC165_CP_4 = 0;
                delayUs(1);
                HC165_CP_4 = 1;
                if (HC165_Q7_4 == 1)
                    temp |= 0x01;
            }
            break;
    }
    return temp;
}

注意，为了让代码更清晰易懂，我将宏定义改成了对应的 C 语言语句。同时，由于寄存器操作需要使用 STM32 的相关库函数，因此我将它们改成了对应的寄存器操作语句。