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上传时间: 2013-09-11
详细说明： C8051F410定时器程序 //----------------------------------------------------------------------------- // F41x_Timer0_16bitTimer.c //----------------------------------------------------------------------------- // Copyright 2006 Silicon Laboratories, Inc. // http://www.silabs.com // // Program Description: // // This program presents an example of use of the Timer0 of the C8051F41x's in // 16-bit counter/timer mode. It uses the 'F410DK as HW platform. // In this example the LED is toggled at a rate defined by the // LED_TOGGLE_RATE cons tant.(in milliseconds) // // The timer is set with this values and counts until an overflow when it // generates an interrupt. This interrupt reloads the timer values and toggles // the LED. // // Pinout: // // P2.1 -> LED // // all other port pins unused // // How To Test: // // 1) Open the F41x_Timer0_16bitTimer.c file in the Silicon Labs IDE. // 2) If another rate is required change LED_TOGGLE_RATE (in msec) // 3) Compile the project and download to the device. // 4) Verify the LED pins of J5 are populated on the 'F41x TB. // 5) Run the code. // 6) Check that the LED is blinking at a constant rate . // // // FID: 41X000046 // Target: C8051F41x // Tool chain: KEIL C51 7.20 / KEIL EVAL C51 // Command Line: None // // Release 1.0 // -Initial Revision (CG) // -08 Mar 2006 // //----------------------------------------------------------------------------- // Includes //----------------------------------------------------------------------------- #include // SFR declarations //----------------------------------------------------------------------------- // Global Constants //----------------------------------------------------------------------------- #define SYSCLK 24500000/8 // SYSCLK in Hz (24.5 MHz internal // oscillator / 8) // the internal oscillator has a // tolerance of +/- 2% #define TIMER_PRESCALER 48 // Based on Timer CKCON settings #define LED_TOGGLE_RATE 50 // LED toggle rate in milliseconds // if LED_TOGGLE_RATE = 1, the LED will // be on for 1 millisecond and off for // 1 millisecond // There are SYSCLK/TIMER_PRESCALER timer ticks per second, so // SYSCLK/TIMER_PRESCALER/1000 timer ticks per millisecond. #define TIMER_TICKS_PER_MS SYSCLK/TIMER_PRESCALER/1000 // Note: LED_TOGGLE_RATE*TIMER_TICKS_PER_MS should not exceed 65535 (0xFFFF) // for the 16-bit timer #define AUX1 TIMER_TICKS_PER_MS*LED_TOGGLE_RATE #define AUX2 -AUX1 #define AUX3 AUX2&0x00FF #define AUX4 ((AUX2&0xFF00)>>8) #define TIMER0_RELOAD_HIGH AUX4 // Reload value for Timer0 high byte #define TIMER0_RELOAD_LOW AUX3 // Reload value for Timer0 low byte sbit LED = P2^1; // LED='1' means ON //----------------------------------------------------------------------------- // Function Prototypes //----------------------------------------------------------------------------- void Port_Init (void); // Port initialization routine void Timer0_Init (void); // Timer0 initialization routine //----------------------------------------------------------------------------- // main() Routine //----------------------------------------------------------------------------- void main (void) { PCA0MD &= ~0x40; // Clear watchdog timer enable OSCICN |= 0x04; // Force Internal Osc. 1:8 prescaler while ((OSCICN & 0x40 ) == 0); // Wait until stable Timer0_Init (); // Initialize the Timer0 Port_Init (); // Init Ports EA = 1; // Enable global interrupts while (1); // Loop forever } //----------------------------------------------------------------------------- // Initialization Subroutines //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // Port_Init //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // This function configures the crossbar and GPIO ports. // // Pinout: // // P2.1 -> LED // // all other port pins unused // //----------------------------------------------------------------------------- void Port_Init (void) { XBR1 = 0x40; // Enable crossbar P2MDOUT = 0x02; // Set LED to push-pull } //----------------------------------------------------------------------------- // Timer0_Init //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // This function configures the Timer0 as a 16-bit timer, interrupt enabled. // Using the internal osc. at 12MHz with a prescaler of 1:8 and reloading the // T0 registers with TIMER0_RELOAD_HIGH/LOW it will interrupt and then toggle // the LED aproximately one time every second. // // Note: The Timer0 uses a 1:48 prescaler. If this setting changes, the // TIMER_PRESCALER constant must also be changed. //----------------------------------------------------------------------------- void Timer0_Init(void) { TH0 = TIMER0_RELOAD_HIGH; // Init Timer0 High register TL0 = TIMER0_RELOAD_LOW ; // Init Timer0 Low register TMOD = 0x01; // Timer0 in 16-bit mode CKCON = 0x02; // Timer0 uses a 1:48 prescaler ET0 = 1; // Timer0 interrupt enabled TCON = 0x10; // Timer0 ON } //----------------------------------------------------------------------------- // Interrupt Service Routines //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // Timer0_ISR //----------------------------------------------------------------------------- // // Here we process the Timer0 interrupt and toggle the LED // //----------------------------------------------------------------------------- void Timer0_ISR (void) interrupt 1 { LED = ~LED; // Toggle the LED TH0 = TIMER0_RELOAD_HIGH; // Reinit Timer0 High register TL0 = TIMER0_RELOAD_LOW; // Reinit Timer0 Low register } //----------------------------------------------------------------------------- // End Of File //----------------------------------------------------------------------------- ...展开收缩
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