单片机实验板和程序.pptxVIP

第1页/共18页单片机实验板和程序第2页/共18页VCCVCC470P0_7R102470P0_6R11E470Q0Q1P0_5R12185508550470BP0_4R13470P0_3R14CR18R19470P0_23R151k1k470P0_1R16470P0_0R17P2_4SEL0P2_5SEpADGEBCFVCCVCCB0B1B2B3L012689Q2Q385508550R20R21SEL31k1kSEL2SEL1SEL0P2_6SEL2P2_7SEL3第3页/共18页P2_7P2_6VCCP2_5VCCP2_4LCD2GND1VSSS0S1S2S32P210KVCC3R3VEEP2_3P0_04RS10kP0_15S4S5S6S7R/WP0_26ER47P2_2D0810kD19S8S9S10S11D210D3R5P0_411P2_1D4P0_51210kD5P0_613S12S13S14S15D6P0_714D7R615P2_0VCCL+161010kGNDL-R28第4页/共18页VCCJP1P1_021P1_143P1_265P1_387P1_4109P1_51211P1_61413P1_71615P1VCCJP2RXD12TXD34INT056INT178T0910T11112WR1314RD1516P3JP3VCC4RXD3TXD21COMD0R2VCC1kD1R7JP41k12D2R9TESTp1k第5页/共18页键盘、显示程序分析目录结构：Ledkey文件夹 ledkey.c ledkey.h#ifndef LEDKEY_H#define LEDKEY_Hextern unsigned char data tick;extern unsigned char data dis_buf[4];extern bit keydown;extern unsigned char scancode;void init_t0();unsigned char Convert_Scancode(unsigned char s);#endif第6页/共18页Ledkey.c：初始化T0定时器：void init_t0(){ TMOD=TMOD0xf0+0x01; ET0=1; EA=1; TH0=0xf8; TR0=1;}模式1，每隔固定的时间溢出，发上定时器中断。第7页/共18页void int_t0(void) interrupt 1 using 2{ unsigned char key; static bit down=0; static unsigned char data index=0; static unsigned int data flash; static bit flash_light; TH0=0xf8;。。。。。。变量说明，注意静态变量重新设定定时器第8页/共18页 key=P2; if((key0x0f)!=0x0f){ down=1; scancode=(~key); }该行是否有键按下，其中：static bit down=0;有键按下为1.unsigned char scancode=0xff;Scancode为扫描码，表示按键。关掉LED数码管的显示，防止下面操作造成显示重影 P0=0xff; switch(index){ case 0: P2=~0x10; break; case 1: P2=~0x20; break; case 2: P2=~0x40; break; default: P2=~0x80; }根据index的值，确定P2的高四位。高四位那位为0，则相关的数码管显示，相对应的按键被扫描。第9页/共18页 if((dis_buf[index]0x80)||((dis_buf[index]0x40)flash_light)) { P0=0xff; } else { P0=~dis_code[dis_buf[index]0x0f]; if(dis_buf[index]0x20) P0=0x7f; }LED数码管全黑给出七段码unsigned char data dis_buf[4] 为显示缓冲区，存储要显示的字符BCD码。unsigned char code dis_code[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67,0x77,0x7c,0x39,0x5e,0x79,0x71};是七段码表，用来存储0-F对应的七段码。显示字符的最高位为1，则该字符不显示。次高位为1，则显示闪烁效果。第10页/共18页 index++; if(index==4) { index=0; keydow