一.题目
二.思路分析
2.1 知识点分析
本届蓝桥杯相比于上一届难度有所提升，但是基本考察的外设和知识点都基本没变，只是提高了代码逻辑，知识点还是常规，LCD,LED,按键，PWM,定时器，串口。
2.2 逻辑分析
这套题做法其实也跟上一届题目大径相同，先把基本模块实现了，按键，LCD，LED，PWM模块，最后也就是难点就说串口模块，最后我们再去处理，边写串口，边重新去修改其他模块的逻辑。大致思路就是如此。
三.代码示例
下面是核心代码
#include "interrupt.h" #include "main.h" #include "string.h" extern ADC_HandleTypeDef hadc2; extern uint T_adc; extern uint T_led; extern uint T_key; extern TIM_HandleTypeDef htim17; extern UART_HandleTypeDef huart1; uchar CNBR,VNBR,IDLE; bool Mode=0; struct key keys[4]={0}; double ADC_Value; bool _UI=0; double cnbr_price=3.5; double vnbr_price=2.0; uchar uart1_rxbuf[30]; uchar cars_type[8]={2,2,2,2,2,2,2,2}; uchar car_num[8][5]={0}; uchar car_time[8][8]; uchar car_free=8; uchar car_loc[8]={0}; uchar car_flag[8]={0}; uchar LED_s=0; uint pass; void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size) { if(huart->Instance==USART1) { //HAL_UART_Transmit(&huart1, uart1_rxbuf, 10, 100); HAL_UARTEx_ReceiveToIdle_IT(&huart1,uart1_rxbuf,30); uart1_rxbuf[22]='\0'; // printf("%s\n",uart1_rxbuf); if(((uart1_rxbuf[0]=='C')&&(uart1_rxbuf[1]=='N')&&(uart1_rxbuf[2]=='B')&&(uart1_rxbuf[3]=='R'))||((uart1_rxbuf[0]=='V')&&(uart1_rxbuf[1]=='N')&&(uart1_rxbuf[2]=='B')&&(uart1_rxbuf[3]=='R'))) { // printf("test1\n"); // printf("car_num=%s",car_num[0]); int i; char text[5]="CNBR"; // printf("anser=%s",strstr((char *)car_num[i],(char *)uart1_rxbuf)); for( i=0;i<8;i++) { //出去 if(strstr((char *)uart1_rxbuf,(char *)car_num[i])&&car_flag) { // printf("test2\n"); car_flag[i]=0; double result=(uart1_rxbuf[12]-car_time[i][0])*30*24; result+=(uart1_rxbuf[13]-car_time[i][1])*24; result+=(uart1_rxbuf[14]-car_time[i][2])*10*24; result+=(uart1_rxbuf[15]-car_time[i][3])*24; result+=(uart1_rxbuf[16]-car_time[i][4])*10; result+=(uart1_rxbuf[17]-car_time[i][5]); if(uart1_rxbuf[18]>car_time[i][6]) { result+=1; } int time=result; if(cars_type[i]==1)result*=vnbr_price; else if(cars_type[i]==0)result*=cnbr_price; car_free++; car_loc[i]=0; if(cars_type[i]==1)text[0]='V'; printf("%s:%s:%d:%.2f",text,car_num[i],time,result); memset(car_num[i],0,4); break; } } //进去 if(car_free==0)return ; if(i==8) { int j=0; for(j=0;j<8;j++) { if(car_loc[j]==0) { car_loc[j]=1; break; } } car_flag[j]=1; car_num[j][0]=uart1_rxbuf[5]; car_num[j][1]=uart1_rxbuf[6]; car_num[j][2]=uart1_rxbuf[7]; car_num[j][3]=uart1_rxbuf[8]; car_time[j][0]=uart1_rxbuf[12]; car_time[j][1]=uart1_rxbuf[13]; car_time[j][2]=uart1_rxbuf[14]; car_time[j][3]=uart1_rxbuf[15]; car_time[j][4]=uart1_rxbuf[16]; car_time[j][5]=uart1_rxbuf[17]; car_time[j][6]=uart1_rxbuf[18]; car_time[j][7]=uart1_rxbuf[19]; if((uart1_rxbuf[0]=='C')&&(uart1_rxbuf[1]=='N')&&(uart1_rxbuf[2]=='B')&&(uart1_rxbuf[3]=='R')) { cars_type[j]=0; } else cars_type[j]=1; car_free--; } } } memset(uart1_rxbuf,0,22); } void lcd_proc() { char Text[40]; sprintf(Text,"V=%.2f",ADC_Value); LCD_DisplayStringLine(Line9,(uchar *)Text); if(_UI==0) { LCD_DisplayStringLine(Line1,(unsigned char *)" Data"); sprintf(Text," CNBR:%d",CNBR); LCD_DisplayStringLine(Line3,(uchar *)Text); sprintf(Text," VNBR:%d",VNBR); LCD_DisplayStringLine(Line5,(uchar *)Text); sprintf(Text," IDLE:%d",IDLE); LCD_DisplayStringLine(Line7,(uchar *)Text); } else if(_UI==1) { LCD_DisplayStringLine(Line1,(unsigned char *)" Para"); sprintf(Text," CNBR:%.2f",cnbr_price); LCD_DisplayStringLine(Line3,(uchar *)Text); sprintf(Text," VNBR:%.2f",vnbr_price); LCD_DisplayStringLine(Line5,(uchar *)Text); } } void led_init() { HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12,GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET); } void led_proc() { if(car_free>0)LED_s|=0x01; else LED_s&=0xfe; if(Mode==0)LED_s&=0xfd; else LED_s|=0x02; HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12,GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOC,(uint16_t)(LED_s<<8),GPIO_PIN_RESET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET); } void key_proc() { if(keys[0].press==1) { _UI=!_UI; LCD_Clear(Black); keys[0].press=0; } if(keys[1].press==1) { keys[1].press=0; if(_UI==0)return ; cnbr_price+=0.5; vnbr_price+=0.5; } if(keys[2].press==1) { keys[2].press=0; if(_UI==0)return ; cnbr_price-=0.5; vnbr_price-=0.5; } if(keys[3].press==1) { Mode=!Mode; if(Mode==1) { __HAL_TIM_SetCompare(&htim17,TIM_CHANNEL_1,8); } else if(Mode==0) { __HAL_TIM_SetCompare(&htim17,TIM_CHANNEL_1,0); } keys[3].press=0; } } void scan_key() { if(uwTick-T_key<50) return; T_key=uwTick; keys[0].level=HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_0); keys[1].level=HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_1); keys[2].level=HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_2); keys[3].level=HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0); for(int i=0;i<4;i++) { switch(keys[i].count) { case 0: if(keys[i].level==0)keys[i].count=1; break; case 1: if(keys[i].level==0)keys[i].count=2; else keys[i].count=0; break; case 2: if(keys[i].level==1) { keys[i].press=1; keys[i].count=0; } break; default:break; } } } void read_adc() { if(uwTick-T_adc<10)return ; T_adc=uwTick; static double temp = 0; static uchar count_V=0; count_V++; HAL_ADC_Start(&hadc2); temp += HAL_ADC_GetValue(&hadc2); HAL_ADC_Stop(&hadc2); if(count_V==5) { ADC_Value=temp*3.3/5/4096; temp=0; count_V=0; } }
