如果你的记性好，也许看到前面有一些键盘初始化了，但那里的初始化是设置南桥接收键盘数据输入和输出而已，只是一个接口，或者是一个代理。在这里才是开始真正初始化键盘，让键盘工作在合适的方式。在电脑里，显示卡输出信息给人看，而键盘扮演着另一个角色，就是让人们可以输入东西，控制电脑做各种各样的事情。虽然电脑的历史也有60年了，并且技术也在飞速地发展，但是键盘还是作为重要的输入方式。希望我们大家能发明一种更好的输入方式，语音输入？还是脑电波输入？也许很快就到来。下面来仔细地分析键盘初始化的实现，代码如下：intkbd_initialize(void){intstatus;intcount;/* Flush the buffer */kbd_clear_input();上面清除键盘输入缓冲里的数据。由于键盘采用环形缓冲作为输入缓冲区，如果不清除输入的内容，就不是当时按键的内容了。/* * Test the keyboard interface. * This seems to be the only way to get it going. * If the test is successful a x55 is placed in the input buffer. */kbd_write_command_w(KBD_CCMD_SELF_TEST);if (kbd_wait_for_input() != 0x55) {printf("Self test cmd failed,ignored!/n");//return 1; }上面进行键盘测试。/* * Perform a keyboard interface test. This causes the controller * to test the keyboard clock and data lines. The results of the * test are placed in the input buffer. */kbd_write_command_w(KBD_CCMD_KBD_TEST);if (kbd_wait_for_input() != 0x00) {printf("KBD_TEST cmd failed,ignored!/n");//return 1; }上面进行键盘接口测试。/* * Enable the keyboard by allowing the keyboard clock to run. */kbd_write_command_w(KBD_CCMD_KBD_ENABLE);上面设置键盘时钟开始运行。/* * Reset keyboard. If the read times out * then the assumption is that no keyboard is * plugged into the machine. * This defaults the keyboard to scan-code set 2. * * Set up to try again if the keyboard asks for RESEND. */count = 0;do {kbd_write_output_w(KBD_CMD_RESET);status = kbd_wait_for_input();if (status == KBD_REPLY_ACK)break;if (status != KBD_REPLY_RESEND) {printf("reset failed/n");if (++count > 1) break;//return 2; } } while (1);if (kbd_wait_for_input() != KBD_REPLY_POR) {printf("NO POR, ignored!/n");//return 3; }上面进行键盘复位设置。/* * Set keyboard controller mode. During this, the keyboard should be * in the disabled state. * * Set up to try again if the keyboard asks for RESEND. */count = 0;do {kbd_write_output_w(KBD_CMD_DISABLE);status = kbd_wait_for_input();if (status == KBD_REPLY_ACK)break;if (status != KBD_REPLY_RESEND){printf("disable failed/n");if (++count > 1) break;//return 4; } } while (1);kbd_write_command_w(KBD_CCMD_WRITE_MODE);kbd_write_output_w(KBD_MODE_KBD_INT | KBD_MODE_SYS | KBD_MODE_DISABLE_MOUSE | KBD_MODE_KCC);上面设置键盘的控制模式。#if 1/* ibm powerpc portables need this to use scan-code set 1 -- Cort */if (!(kbd_write_command_w_and_wait(KBD_CCMD_READ_MODE) & KBD_MODE_KCC)) {/* * If the controller does not support conversion, * Set the keyboard to scan-code set 1. */kbd_write_output_w(0xF0);kbd_wait_for_input();kbd_write_output_w(0x01);kbd_wait_for_input(); }#endifif (kbd_write_output_w_and_wait(KBD_CMD_ENABLE) != KBD_REPLY_ACK) {return 5; }上面设置键盘输入的编码方式。/* * Finally, set the typematic rate to maximum. */if (kbd_write_output_w_and_wait(KBD_CMD_SET_RATE) != KBD_REPLY_ACK) {return 6; }if (kbd_write_output_w_and_wait(0x00) != KBD_REPLY_ACK) {return 7; }上面设置键盘的按键速度。return 0;}通过上面的初始化设置，就可以接收键盘输入了。
