设计电路的时候犯了一个错，然后换了一种方式控制数码管

原创面包板社区 2023-04-28 20:09

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近期搞了个单板，客户定制的，核心ST的MCU。熟悉又陌生的东西啊，依稀记得那时候自己还是个年轻小伙。功能简单，花了一天的时间把原理图和PCB搞完就投产了。等待几天PCB回来了，在等待几天PCBA也回来了。准备调试。

嗯。调那个呢?功能要求有数码管，要不先搞点东西显示下。

找到以前的DEMO，改改引脚，应该很快。这样想着。结果上天不做美啊。DEMO上数码管段选脚是放在同一GPIO的，而我的，七零八落的，哎。这可咋办?

思索良久之后，是不是可以通过将段码值通过移位赋值的方式直接将相应值直接给GPIO呢

共阳极段码表是这个

unsigned char LEDSEG[] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xFF};

如果可以像这样给段码赋值就好了

SMG_A=((LEDSEG[要显示的数字]>>0)&0x01);SMG_B=((LEDSEG[要显示的数字]>>1)&0x01);SMG_C=((LEDSEG[要显示的数字]>>2)&0x01);SMG_D=((LEDSEG[要显示的数字]>>3)&0x01);SMG_E=((LEDSEG[要显示的数字]>>4)&0x01);SMG_F=((LEDSEG[要显示的数字]>>5)&0x01);SMG_G=((LEDSEG[要显示的数字]>>6)&0x01);

思路有了，接下来就是看看ST库里面有木有像51单片机那样可以直接给个引脚赋值就能控制高低电平的源码了，搜索良久，发现并没有，要不只能通过GPIO_SetBits或者GPIO_ResetBits控制单个GPIO，要不WRITE_DATA控制一组引脚。

哎，我又沉思了，后来网上找一遍，结果还真找到了

#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2))#define MEM_ADDR(addr) *((volatile unsigned long *)(addr))#define BIT_ADDR(addr, bitnum) MEM_ADDR( BITBAND(addr, bitnum) )#define GPIOA_ODR_Addr (GPIOA_BASE+12) //0x4001080C#define GPIOB_ODR_Addr (GPIOB_BASE+12) //0x40010C0C#define GPIOC_ODR_Addr (GPIOC_BASE+12) //0x4001100C#define GPIOD_ODR_Addr (GPIOD_BASE+12) //0x4001140C#define GPIOE_ODR_Addr (GPIOE_BASE+12) //0x4001180C#define GPIOA_IDR_Addr (GPIOA_BASE+8) //0x40010808#define GPIOB_IDR_Addr (GPIOB_BASE+8) //0x40010C08#define GPIOC_IDR_Addr (GPIOC_BASE+8) //0x40011008#define GPIOD_IDR_Addr (GPIOD_BASE+8) //0x40011408#define GPIOE_IDR_Addr (GPIOE_BASE+8) //0x40011808//-----------------------------------------------------#define PA0 BIT_ADDR(GPIOA_ODR_Addr, 0) //输出#define PA1 BIT_ADDR(GPIOA_ODR_Addr, 1) //输出#define PA2 BIT_ADDR(GPIOA_ODR_Addr, 2) //输出#define PA3 BIT_ADDR(GPIOA_ODR_Addr, 3) //输出#define PA4 BIT_ADDR(GPIOA_ODR_Addr, 4) //输出#define PA5 BIT_ADDR(GPIOA_ODR_Addr, 5) //输出#define PA6 BIT_ADDR(GPIOA_ODR_Addr, 6) //输出#define PA7 BIT_ADDR(GPIOA_ODR_Addr, 7) //输出#define PA8 BIT_ADDR(GPIOA_ODR_Addr, 8) //输出#define PA9 BIT_ADDR(GPIOA_ODR_Addr, 9) //输出#define PA10 BIT_ADDR(GPIOA_ODR_Addr, 10) //输出#define PA11 BIT_ADDR(GPIOA_ODR_Addr, 11) //输出#define PA12 BIT_ADDR(GPIOA_ODR_Addr, 12) //输出#define PA13 BIT_ADDR(GPIOA_ODR_Addr, 13) //输出#define PA14 BIT_ADDR(GPIOA_ODR_Addr, 14) //输出#define PA15 BIT_ADDR(GPIOA_ODR_Addr, 15) //输出#define PA0in BIT_ADDR(GPIOA_IDR_Addr, 0) //??#define PA1in BIT_ADDR(GPIOA_IDR_Addr, 1) //??#define PA2in BIT_ADDR(GPIOA_IDR_Addr, 2) //??#define PA3in BIT_ADDR(GPIOA_IDR_Addr, 3) //??#define PA4in BIT_ADDR(GPIOA_IDR_Addr, 4) //??#define PA5in BIT_ADDR(GPIOA_IDR_Addr, 5) //??#define PA6in BIT_ADDR(GPIOA_IDR_Addr, 6) //??#define PA7in BIT_ADDR(GPIOA_IDR_Addr, 7) //??#define PA8in BIT_ADDR(GPIOA_IDR_Addr, 8) //??#define PA9in BIT_ADDR(GPIOA_IDR_Addr, 9) //??#define PA10in BIT_ADDR(GPIOA_IDR_Addr, 10) //??#define PA11in BIT_ADDR(GPIOA_IDR_Addr, 11) //??#define PA12in BIT_ADDR(GPIOA_IDR_Addr, 12) //??#define PA13in BIT_ADDR(GPIOA_IDR_Addr, 13) //??#define PA14in BIT_ADDR(GPIOA_IDR_Addr, 14) //??#define PA15in BIT_ADDR(GPIOA_IDR_Addr, 15) //??//-----------------------------------------------------#define PB0 BIT_ADDR(GPIOB_ODR_Addr, 0) //输出#define PB1 BIT_ADDR(GPIOB_ODR_Addr, 1) //输出#define PB2 BIT_ADDR(GPIOB_ODR_Addr, 2) //输出#define PB3 BIT_ADDR(GPIOB_ODR_Addr, 3) //输出#define PB4 BIT_ADDR(GPIOB_ODR_Addr, 4) //输出#define PB5 BIT_ADDR(GPIOB_ODR_Addr, 5) //输出#define PB6 BIT_ADDR(GPIOB_ODR_Addr, 6) //输出#define PB7 BIT_ADDR(GPIOB_ODR_Addr, 7) //输出#define PB8 BIT_ADDR(GPIOB_ODR_Addr, 8) //输出#define PB9 BIT_ADDR(GPIOB_ODR_Addr, 9) //输出#define PB10 BIT_ADDR(GPIOB_ODR_Addr, 10) //输出#define PB11 BIT_ADDR(GPIOB_ODR_Addr, 11) //输出#define PB12 BIT_ADDR(GPIOB_ODR_Addr, 12) //输出#define PB13 BIT_ADDR(GPIOB_ODR_Addr, 13) //输出#define PB14 BIT_ADDR(GPIOB_ODR_Addr, 14) //输出#define PB15 BIT_ADDR(GPIOB_ODR_Addr, 15) //输出#define PB0in BIT_ADDR(GPIOB_IDR_Addr, 0) //??#define PB1in BIT_ADDR(GPIOB_IDR_Addr, 1) //??#define PB2in BIT_ADDR(GPIOB_IDR_Addr, 2) //??#define PB3in BIT_ADDR(GPIOB_IDR_Addr, 3) //??#define PB4in BIT_ADDR(GPIOB_IDR_Addr, 4) //??#define PB5in BIT_ADDR(GPIOB_IDR_Addr, 5) //??#define PB6in BIT_ADDR(GPIOB_IDR_Addr, 6) //??#define PB7in BIT_ADDR(GPIOB_IDR_Addr, 7) //??#define PB8in BIT_ADDR(GPIOB_IDR_Addr, 8) //??#define PB9in BIT_ADDR(GPIOB_IDR_Addr, 9) //??#define PB10in BIT_ADDR(GPIOB_IDR_Addr, 10) //??#define PB11in BIT_ADDR(GPIOB_IDR_Addr, 11) //??#define PB12in BIT_ADDR(GPIOB_IDR_Addr, 12) //??#define PB13in BIT_ADDR(GPIOB_IDR_Addr, 13) //??#define PB14in BIT_ADDR(GPIOB_IDR_Addr, 14) //??#define PB15in BIT_ADDR(GPIOB_IDR_Addr, 15) //??//----------------------------------------------------#define PC0 BIT_ADDR(GPIOC_ODR_Addr, 0) //输出#define PC1 BIT_ADDR(GPIOC_ODR_Addr, 1) //输出#define PC2 BIT_ADDR(GPIOC_ODR_Addr, 2) //输出#define PC3 BIT_ADDR(GPIOC_ODR_Addr, 3) //输出#define PC4 BIT_ADDR(GPIOC_ODR_Addr, 4) //输出#define PC5 BIT_ADDR(GPIOC_ODR_Addr, 5) //输出#define PC6 BIT_ADDR(GPIOC_ODR_Addr, 6) //输出#define PC7 BIT_ADDR(GPIOC_ODR_Addr, 7) //输出#define PC8 BIT_ADDR(GPIOC_ODR_Addr, 8) //输出#define PC9 BIT_ADDR(GPIOC_ODR_Addr, 9) //输出#define PC10 BIT_ADDR(GPIOC_ODR_Addr, 10) //输出#define PC11 BIT_ADDR(GPIOC_ODR_Addr, 11) //输出#define PC12 BIT_ADDR(GPIOC_ODR_Addr, 12) //输出#define PC13 BIT_ADDR(GPIOC_ODR_Addr, 13) //输出#define PC14 BIT_ADDR(GPIOC_ODR_Addr, 14) //输出#define PC15 BIT_ADDR(GPIOC_ODR_Addr, 15) //输出#define PC0in BIT_ADDR(GPIOC_IDR_Addr, 0) //??#define PC1in BIT_ADDR(GPIOC_IDR_Addr, 1) //??#define PC2in BIT_ADDR(GPIOC_IDR_Addr, 2) //??#define PC3in BIT_ADDR(GPIOC_IDR_Addr, 3) //??#define PC4in BIT_ADDR(GPIOC_IDR_Addr, 4) //??#define PC5in BIT_ADDR(GPIOC_IDR_Addr, 5) //??#define PC6in BIT_ADDR(GPIOC_IDR_Addr, 6) //??#define PC7in BIT_ADDR(GPIOC_IDR_Addr, 7) //??#define PC8in BIT_ADDR(GPIOC_IDR_Addr, 8) //??#define PC9in BIT_ADDR(GPIOC_IDR_Addr, 9) //??#define PC10in BIT_ADDR(GPIOC_IDR_Addr, 10) //??#define PC11in BIT_ADDR(GPIOC_IDR_Addr, 11) //??#define PC12in BIT_ADDR(GPIOC_IDR_Addr, 12) //??#define PC13in BIT_ADDR(GPIOC_IDR_Addr, 13) //??#define PC14in BIT_ADDR(GPIOC_IDR_Addr, 14) //??#define PC15in BIT_ADDR(GPIOC_IDR_Addr, 15) //??//----------------------------------------------------#define PD0 BIT_ADDR(GPIOD_ODR_Addr, 0) //输出#define PD1 BIT_ADDR(GPIOD_ODR_Addr, 1) //输出#define PD2 BIT_ADDR(GPIOD_ODR_Addr, 2) //输出#define PD3 BIT_ADDR(GPIOD_ODR_Addr, 3) //输出#define PD4 BIT_ADDR(GPIOD_ODR_Addr, 4) //输出#define PD5 BIT_ADDR(GPIOD_ODR_Addr, 5) //输出#define PD6 BIT_ADDR(GPIOD_ODR_Addr, 6) //输出#define PD7 BIT_ADDR(GPIOD_ODR_Addr, 7) //输出#define PD8 BIT_ADDR(GPIOD_ODR_Addr, 8) //输出#define PD9 BIT_ADDR(GPIOD_ODR_Addr, 9) //输出#define PD10 BIT_ADDR(GPIOD_ODR_Addr, 10) //输出#define PD11 BIT_ADDR(GPIOD_ODR_Addr, 11) //输出#define PD12 BIT_ADDR(GPIOD_ODR_Addr, 12) //输出#define PD13 BIT_ADDR(GPIOD_ODR_Addr, 13) //输出#define PD14 BIT_ADDR(GPIOD_ODR_Addr, 14) //输出#define PD15 BIT_ADDR(GPIOD_ODR_Addr, 15) //输出#define PD0in BIT_ADDR(GPIOD_IDR_Addr, 0) //??#define PD1in BIT_ADDR(GPIOD_IDR_Addr, 1) //??#define PD2in BIT_ADDR(GPIOD_IDR_Addr, 2) //??#define PD3in BIT_ADDR(GPIOD_IDR_Addr, 3) //??#define PD4in BIT_ADDR(GPIOD_IDR_Addr, 4) //??#define PD5in BIT_ADDR(GPIOD_IDR_Addr, 5) //??#define PD6in BIT_ADDR(GPIOD_IDR_Addr, 6) //??#define PD7in BIT_ADDR(GPIOD_IDR_Addr, 7) //??#define PD8in BIT_ADDR(GPIOD_IDR_Addr, 8) //??#define PD9in BIT_ADDR(GPIOD_IDR_Addr, 9) //??#define PD10in BIT_ADDR(GPIOD_IDR_Addr, 10) //??#define PD11in BIT_ADDR(GPIOD_IDR_Addr, 11) //??#define PD12in BIT_ADDR(GPIOD_IDR_Addr, 12) //??#define PD13in BIT_ADDR(GPIOD_IDR_Addr, 13) //??#define PD14in BIT_ADDR(GPIOD_IDR_Addr, 14) //??#define PD15in BIT_ADDR(GPIOD_IDR_Addr, 15) //??//----------------------------------------------------#define PE0 BIT_ADDR(GPIOE_ODR_Addr, 0) //??#define PE1 BIT_ADDR(GPIOE_ODR_Addr, 1) //??#define PE2 BIT_ADDR(GPIOE_ODR_Addr, 2) //??#define PE3 BIT_ADDR(GPIOE_ODR_Addr, 3) //??#define PE4 BIT_ADDR(GPIOE_ODR_Addr, 4) //??#define PE5 BIT_ADDR(GPIOE_ODR_Addr, 5) //??#define PE6 BIT_ADDR(GPIOE_ODR_Addr, 6) //??#define PE7 BIT_ADDR(GPIOE_ODR_Addr, 7) //??#define PE8 BIT_ADDR(GPIOE_ODR_Addr, 8) //??#define PE9 BIT_ADDR(GPIOE_ODR_Addr, 9) //??#define PE10 BIT_ADDR(GPIOE_ODR_Addr, 10) //??#define PE11 BIT_ADDR(GPIOE_ODR_Addr, 11) //??#define PE12 BIT_ADDR(GPIOE_ODR_Addr, 12) //??#define PE13 BIT_ADDR(GPIOE_ODR_Addr, 13) //??#define PE14 BIT_ADDR(GPIOE_ODR_Addr, 14) //??#define PE15 BIT_ADDR(GPIOE_ODR_Addr, 15) //??#define PE0in BIT_ADDR(GPIOE_IDR_Addr, 0) //??#define PE1in BIT_ADDR(GPIOE_IDR_Addr, 1) //??#define PE2in BIT_ADDR(GPIOE_IDR_Addr, 2) //??#define PE3in BIT_ADDR(GPIOE_IDR_Addr, 3) //??#define PE4in BIT_ADDR(GPIOE_IDR_Addr, 4) //??#define PE5in BIT_ADDR(GPIOE_IDR_Addr, 5) //??#define PE6in BIT_ADDR(GPIOE_IDR_Addr, 6) //??#define PE7in BIT_ADDR(GPIOE_IDR_Addr, 7) //??#define PE8in BIT_ADDR(GPIOE_IDR_Addr, 8) //??#define PE9in BIT_ADDR(GPIOE_IDR_Addr, 9) //??#define PE10in BIT_ADDR(GPIOE_IDR_Addr, 10) //??#define PE11in BIT_ADDR(GPIOE_IDR_Addr, 11) //??#define PE12in BIT_ADDR(GPIOE_IDR_Addr, 12) //??#define PE13in BIT_ADDR(GPIOE_IDR_Addr, 13) //??#define PE14in BIT_ADDR(GPIOE_IDR_Addr, 14) //??#define PE15in BIT_ADDR(GPIOE_IDR_Addr, 15) //??

有木有一种豁然开朗的感觉，这时候才意识到自己基础知识得有多差了。

接下来数码管就可以好好玩了，不管硬件电路控制数码管的引脚是一组的还是乱七八糟的，我们都有一战之力了。

看了上面的源码，有些人就会有个疑问，只定义了此GPIO的输入输出，并没有指出输出的类型，如果是输入，也有很多属性没有赋值。其实不用考虑那么多，直接使用库函数啊

GPIO_InitTypeDef GPIO_InitStructure;p>RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15|GPIO_Pin_0;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStructure);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);