最小系统板测试程序

最小系统板测试程序 二极管闪烁 串口接收 中断方式 发送 查询方式 外部 RAM 的读写 include include include define low XBYTE 0 xe000 define high XBYTE 0 xfff0 sbit LED P1 3 发光二极管连接于 P1 3 24C64 接口引脚定义 sbit WP P1 0 sbit I2C SCK P1 1 sbit I2C SDA P1 2 void Delay 10 uS void bit I2C Start void void I2C Stop void void I2C Ack void void I2C Nack void bit I2C Send Byte unsigned char d unsigned char I2C Receive Byte void void AT24C64 W unsigned char mcu address unsigned int AT24C64 address unsigned int count void AT24C64 R unsigned char mcu address unsigned int AT24C64 address unsigned int count unsigned char DataBuf 8 0 bit flag 0 void init all void SCON 0 x50 SCON serail mode 1 8 bit UART enable ucvr TMOD 0 x20 TMOD timer 1 mode 2 8 bit reload PCON 0 x00 SMOD 0 TH1 0 xFD Baud 9600 fosc 11 0592MHz IE 0 x90 Enable Serial Interrupt TR1 1 timer 1 run 向串口发送一个字符 void send char com unsigned char ch SBUF ch while TI 0 TI 0 串口接收中断函数 void serial interrupt 4 using 3 if RI unsigned char ch RI 0 ch SBUF if ch 0 xAA flag 1 else flag 0 外部 RAM 读写测试 void exram wr void unsigned char i j unsigned char xdata low 0 xD020 指针指向 2000H 单元 unsigned char xdata high 0 xF000 指针指向 2000H 单元 写 0 xE000 0 xE00F 单元 for i 0 i 16 i low 0 xf0 i low 将 0 xE000 0 xE00F 单元的数据读出 并存入 0 xF000 0 xF00F 单元 low 0 xD020 for i 0 i 16 i j low low high j high I2C 测试程序 void I2C WR void unsigned char i WP 0 DataBuf 0 2 DataBuf 1 3 AT24C64 W DataBuf 0 2 Delay 10 uS DataBuf 0 34 DataBuf 1 56 AT24C64 R DataBuf 0 2 for i 0 i 2 i SBUF DataBuf i while TI 0 TI 0 main LED 0 init all I2C WR exram wr while 1 LED 1 发光二极管点亮 if flag 1 send char com 0 xbb flag 0 LED 0 发光二极管熄灭 24C64 子程序 void Delay 10 uS void char i 10 while i bit I2C Start void Delay 10 uS I2C SDA 1 Delay 10 uS I2C SCK 1 Delay 10 uS if I2C SDA 0 return 0 if I2C SCK 0 return 0 I2C SDA 0 Delay 10 uS I2C SCK 0 Delay 10 uS return 1 void I2C Stop void Delay 10 uS I2C SDA 0 Delay 10 uS I2C SCK 1 Delay 10 uS I2C SDA 1 Delay 10 uS void I2C Ack void Delay 10 uS I2C SDA 0 Delay 10 uS I2C SCK 1 Delay 10 uS I2C SCK 0 Delay 10 uS void I2C Nack void Delay 10 uS I2C SDA 1 Delay 10 uS I2C SCK 1 Delay 10 uS I2C SCK 0 Delay 10 uS bit I2C Send Byte unsigned char d unsigned char i 8 bit bit ack while i Delay 10 uS if d else I2C SDA 0 Delay 10 uS I2C SCK 1 Delay 10 uS I2C SCK 0 d d 1 Delay 10 uS I2C SDA 1 Delay 10 uS I2C SCK 1 Delay 10 uS bit ack I2C SDA I2C SCK 0 Delay 10 uS return bit ack unsigned char I2C Receive Byte void unsigned char i 8 d Delay 10 uS I2C SDA 1 while i d d 1 Delay 10 uS I2C SCK 1 if I2C SDA d Delay 10 uS I2C SCK 0 return d void AT24C64 W unsigned char mcu address unsigned int AT24C64 address unsigned int count unsigned int i while count I2C Start I2C Send Byte 0 xa0 AT24C64 address 256 2 24C16 USE I2C Send Byte 0 xa0 I2C Send Byte AT24C64 address 256 高 5 位地址 I2C Send Byte AT24C64 address 256 低 8 位地址 I2C Send Byte unsigned char mcu address 字节所在位置 I2C Stop for i 0 i 100 i Delay 10 uS waiting for write cycle to be completed unsigned char mcu address AT24C64 address void AT24C64 R unsigned char mcu address unsigned int AT24C64 address unsigned int count while count I2C Start I2C Send Byte 0 xa0 AT24C64 address 256 2 24C16 USE I2C Send Byte 0 xa0 I2C Send Byte AT24C64 address 256 I2C Send Byte AT24C64 address 256 I2C Start I2C Send Byte 0 xa1 AT24C64 address 256 2 I2C Send Byte 0 xa1 unsigned char mcu address I2C Receive Byte I2C Nack I2C Stop unsigned char mcu address AT24C64 address 测试 7279 include include 函数定义 void long delay void 长延时 void short delay void 短暂延时 void delay10ms unsigned char 延时 10MS void write7279 unsigned char unsigned char 写入到 HD7279 unsigned char read7279 unsigned char 从 HD7279 读出 void send byte unsigned char 发送一个字节 unsigned char receive byte void 接收一个字节 变量及 I O 口定义 unsigned char key number i unsigned int tmr sbit key P1 4 key 连接于 P1 3 sbit cs P1 5 cs 连接 P1 4 sbit clk P1 6 clk 连接于 P1 5 sbit dat P1 7 dat 连接于 P1 2 HD7279A 指令 define CMD RESET 0 xa4 复位 清除 指令 define CMD TEST 0 xbf 测试指令 define DECODE0 0 x80 方式 0 译码 define DECODE1 0 xc8 方式 1 译码 define CMD READ 0 x15 读键值指令 define UNDECODE 0 x90 不译码 define RTL CYCLE 0 xa3 循环左移指令 define RTR CYCLE 0 xa2 循环右移指令 define RTL UNCYL 0 xa1 左移指令 define RTR UNCYL 0 xa0 右移指令 define ACTCTL 0 x98 消隐指令 define SEGON 0 xe0 段点亮指令 define SEGOFF 0 xc0 段关闭指令 define BLINKCTL 0 x88 闪烁指令 主程序 main while 1 for tmr 0 tmr 0 x200 tmr 上电延时 send byte CMD RESET 复位 HD7279A send byte CMD TEST 测试指令 delay10ms 100 send byte CMD RESET 清除显示 译码方式 1 测试 利用 SEG7 显示 for i 0 i 16 i write7279 DECODE1 7 j 译码方式 1 指令 显示在第 8 位 delay10ms 50 键盘接口测试 读键指并在第 6 7 位数码管显示 key number 0 xff while 1 if key 如果有键按下 key number read7279 CMD READ 读出键码 write7279 DECODE1 7 key number 16 在第 7 位显示键码高 8 位 write7279 DECODE1 6 key number 在第 6 位显示键码低 8 位 while key 等待按键放开 HD7279A 函数库 void write7279 unsigned char cmd unsigned char dta send byte cmd send byte dta unsigned char read7279 unsigned char command send byte command return receive byte void send byte unsigned char out byte unsigned char i cs 0 long delay for i 0 i 8 i if out byte else dat 0 clk 1 short delay clk 0 short delay out byte out byte 2 dat 0 unsigned char receive byte void unsigned char i in byte dat 1 set to input mode long delay for i 0 i 8 i clk 1 short delay in byte in byte 2 if dat in byte in byte