这里介绍一个简单的51单片机与键盘通讯的测试小程序,它同样可以用在 4x1, 4x2 或者 4x3 Keypad 上。希望对大家有用。(这个小程序是将键盘上的键码通过PS2接口,由51单片机的串行接口输出,进行测试。)
- unsigned short keydata = 0, special = 0, down = 0;
-
- // PS2 module connections
- sbit PS2_DATA at P0_0_bit;
- sbit PS2_CLOCK at P0_1_bit;
- // End PS2 module connections
- void main() {
- UART1_Init(4800); // Initialize UART module at 4800 bps
- Ps2_Config(); // Initialize PS/2 Keyboard
- Delay_ms(100); // Wait for keyboard to finish
-
- UART1_Write_Text("Ready");
- UART1_Write(10); // Line Feed
- UART1_Write(13); // Carriage return
- do {
- if (Ps2_Key_Read(&keydata, &special, &down)) {
- if (down && (keydata == 16)) {// Backspace
- UART1_Write(0x08);
- }
- else if (down && (keydata == 13)) {// Enter
- UART1_Write('r'); // send carriage return to usart terminal
- //Usart_Write('n'); // uncomment this line if usart terminal also expects line feed
- // for new line transition
- }
- else if (down && !special && keydata) {
- UART1_Write(keydata);
- }
- }
- Delay_ms(10); // debounce
- } while (1);
- }
复制代码 相关信息:http://www.51hei.com/bbs/dpj-136722-1.html
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