ToolStick Led Blink 프로그램

ToolStick Led Blink 프로그램은 다음과 같다.
프로그램코드는 제공되는 CD안에 들어있으며, 역시 인터넷으로 Silabs 홈페이지에서 검색하여 사용이 가능하다.
컴파일은 Keil C51을 사용하였다.

--- 프로그램코드 ---

//-----------------------------------------------------------------------------
// BLINK_LED.c
//-----------------------------------------------------------------------------
// Copyright (C) 2005 Silicon Laboratories, Inc.
//
// AUTH: PB
// DATE: 20 JUN 05
//
// This program flashes the red and green LEDs (P0.2 & P0.3) on the tools demo
// board about 2.5 times a second using the interrupt handler for Timer2.
//
// Target: C8051F300 (Tools Demo Board)
//
// Tool chain: KEIL Eval 'c'
//

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <c8051f300.h>                    // SFR declarations

//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F30x
//-----------------------------------------------------------------------------
sfr16 TMR2RL   = 0xca;                    // Timer2 reload value
sfr16 TMR2     = 0xcc;                    // Timer2 counter

//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
sbit REDLED = P0^2;                       // REDLED='1' means ON
sbit GRNLED = P0^3;                       // GRNLED='1' means ON

//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT_Init (void);
void Timer2_Init (void);
void Timer2_ISR (void);

//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void) {

   PCA0MD &= ~0x40;                       // WDTE = 0 (disable Watchdog Timer)
    
   SYSCLK_Init ();                        // Initialize System Clock
   PORT_Init ();                          // Initialize Crossbar and GPIO
   
   REDLED = 1;                            // Turn REDLED ON
   GRNLED = 0;                            // Turn GRNLED OFF

   Timer2_Init ();                        // Init Timer2 to generate
                                          // interrupts at a 5Hz rate.

   EA = 1;                                  // Enable global interrupts

   while (1) {                            // Spin forever
   }
}

//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use the internal oscillator
// 24.5MHz / 8 as its clock source.  Also enables missing clock detector reset.
//
void SYSCLK_Init (void)
{
   OSCICN = 0x04;                         // Set SYSCLK as Int Osc (24.5 MHz)/8
   RSTSRC = 0x04;                         // Enable missing clock detector
}

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports.
// P0.0 -
// P0.1 -
// P0.2 - <skipped> REDLED (push-pull)
// P0.3 - <skipped> GRNLED (push-pull)
// P0.4 -
// P0.5 -
// P0.6 -
// P0.7 - C2D
//
void PORT_Init (void)
{
   XBR0     = 0x0C;                       // Skip P0.2 (REDLED) and P0.3 (GRNLED)
                                          // in Crossbar pin assignments
   XBR1     = 0x00;                       // No digital peripherals selected
   XBR2     = 0x40;                       // Enable crossbar and weak pull-ups
   P0MDOUT |= 0x0C;                       // Enable REDLED and GRNLED as  
                                          // push-pull outputs
}

//-----------------------------------------------------------------------------
// Timer2_Init
//-----------------------------------------------------------------------------
//
// Configure Timer2 to 16-bit auto-reload and generate an interrupt at some
// interval (reloads to TMR2RL after overflow) using SYSCLK/12 as its timebase.
//
// TMR2RL | Interrupt Frequency
// ----------------------------------
// 0x389E | 5Hz
// 0x9C4F | 10Hz
// 0xCE27 | 20Hz
// 0xEC0F | 50Hz
// 0xF607 | 100Hz
//
void Timer2_Init (void)
{
   TMR2CN  = 0x00;                        // Stop Timer2; Clear TF2;
                                          // select SYSCLK/12 in T2XCLK
   CKCON  &= ~0x60;                       // Timer2 clocked based on T2XCLK;

   TMR2RL  = 0xCE27;                      // Reload to 0x389E after overflow
                                          // 이 값을 고쳐서 점멸시간 간격 조절
   TMR2    = TMR2RL;                      // Initialize Timer2 to reload value

   ET2     = 1;                           // Enable Timer2 interrupts
   TR2     = 1;                           // Start Timer2
}

//-----------------------------------------------------------------------------
// Interrupt Service Routines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// Timer2_ISR
//-----------------------------------------------------------------------------
// This routine inverts the state of the LED pins whenever Timer2 overflows.
//
void Timer2_ISR (void) interrupt 5
{
   static int T2_Overflow_Count = 0;      // Counter for Timer2 interrupts

   TF2H = 0;                              // Clear Timer2 interrupt flag

   P0 ^= 0x0C;                            // Invert the state of the LEDs

   T2_Overflow_Count++;                   // Increment counter
}

컴파일과 링크 후 작동되는 모습의 동영상을 함께 올려본다.

ToolStick Led Blink 프로그램
http://electoy.tistory.com/92
JelicleLim(2008.7.1)