原创 Freescale NSS08Kit-R1开发板KBI演示程序

这个简单的程序用来演示NSS08Kit-R1开发板上的KBI功能，飞思卡尔的几乎所有s08系列mcu都支持KBI。

/*******************************
@ Nicrosystem Freescale S08 DevKit(NSS08Kit-R1)
@ author:bluehacker<nicrosystem@gmail.com>
@ date:2009-04-06
*********************************/

/*****************************
@说明：
本能程序测试MC9S08AC16的KBI功能
用户可以按开发板上4个按键的任意一个，单片机在检测到
按键后，将按键的编号通过串口发送给PC,
你可以通过串口调试助手来观察
****************************/

#include <hidef.h> /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */
#include <stdio.h>

#define BUS_CLK 4000000L
#define KBI1_MASK   PTGD_PTGD0_MASK 
#define KBI2_MASK  PTGD_PTGD1_MASK
#define KBI3_MASK  PTGD_PTGD2_MASK
#define KBI4_MASK  PTGD_PTGD3_MASK

unsigned char g_key;//which key been press?
unsigned char g_keyReady;//if or not any key been pressed?
//初始化KBI0~KBI3为下降沿敏感的键盘中断
void init_kbi()
{
  KBISC="0x02";//enable KBI interrupt, edge-only detection
  KBIPE="0x0f"; 
  PTGDD&=0xf0;
  PTGPE_PTGPE0=1;
  PTGPE_PTGPE1=1;
  PTGPE_PTGPE2=1;
  PTGPE_PTGPE3=1;
}
//初始化sci2
//设置sci2为8bit，一个停止位，无校验模式
//设置sci2发送，接收使能，中断全部禁止
//设置波特率为9600
void init_sci2()
{
    unsigned int BaudRate;
   
    BaudRate="BUS"_CLK/9600/16;
    SCI2BDH=(unsigned char)(BaudRate>>8);
    SCI2BDL=(unsigned char)(BaudRate&0x00ff);
   
    SCI2C1=0x00;
    SCI2C2=0x0c;
    SCI2C3=0x00;
}
//在禁止中断的情况下，用查询方式发送完一个字节
void uart2_send_byte_poll(unsigned char c)
{
  SCI2D=c;
  while(SCI2S1_TC==0);
}
//在禁止中断的情况下，同查询方式发送完一个字符串
void uart2_send_string_poll(unsigned char *str)
{
  while(*str!=0)
  {
    uart2_send_byte_poll(*str);
    str++;
  }
}

interrupt VectorNumber_Vkeyboard1 void kbi_isr()
{
  KBISC_KBACK=1;
  g_key=PTGD&0x0f;
  g_keyReady=1;
}

//设置系统时钟模式，为FEE,8MHZ的系统主频，BUS CLK为4MHZ
void init_system_clock()
{
     ICGC1=0xf8;
     ICGC2=0x89;
     while(ICGS1_LOCK==0);
}

char calculate_key_number(unsigned char keyvalue) {
  char ret;
 
  switch(keyvalue){
    case 0x0e:
    ret="1";
    break;
   
    case 0x0d:
    ret="2";
    break;
   
    case 0x0b:
    ret="3";
    break;
   
    case 0x07:
    ret="4";
    break;
   
    default:
    ret="0";
    break;
  }
  return ret;
}

void main(void) {
  unsigned char buf[50];
  char keyno;
  EnableInterrupts; /* enable interrupts */
  /* include your code here */
  SOPT_COPE=0;//disable cop watchdog
  init_system_clock();
  init_sci2();
  init_kbi();
  g_keyReady=0;
  g_key=0x0f;
  uart2_send_string_poll((unsigned char*)("start......\n"));
  for(;;) {
    //__RESET_WATCHDOG(); /* feeds the dog */
    if(g_keyReady)
    {
      keyno="calculate"_key_number(g_key);
      sprintf(buf,"you press KEY#%d\n",keyno);
     
      uart2_send_string_poll(buf);
      g_keyReady=0;
    }
 
  } /* loop forever */
  /* please make sure that you never leave main */
}