[经验]

转帖：带你用Proteus玩转ARM Cortex

2013-11-29 02:08:39

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本帖最后由鼓山于 2013-11-29 02:11 编辑

转帖一个，阿拉在网上刚看到的，用proteus8.0玩转ARM Cortex的范例！

第一，程序
//*****************************************************************************
//
//
//*****************************************************************************
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/gpio.h"
#include "driverlib/pwm.h"
#include "driverlib/sysctl.h"

//*****************************************************************************
//
//! addtogroup example_list
//!

PWM (pwmgen)

//!
//! This example application utilizes the PWM peripheral to output a 25% duty
//! cycle PWM signal and a 75% duty cycle PWM signal, both at 50 kHz.  Once
//! configured, the application enters an infinite loop, doing nothing while
//! the PWM peripheral continues to output its signals.
//
//*****************************************************************************
//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, unsigned long ulLine)
{
}
#endif
//*****************************************************************************
//
// This example demonstrates how to setup the PWM block to generate signals.
//
//*****************************************************************************
int
main(void)
{
unsigned long ulPeriod;
//
// Set the clocking to run directly from the crystal.
//
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
               SYSCTL_XTAL_6MHZ);
SysCtlPWMClockSet(SYSCTL_PWMDIV_1);

//
// Enable the peripherals used by this example.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
//
// Set GPIO D0 and D1 as PWM pins.  They are used to output the PWM0 and
// PWM1 signals.
//
GPIOPinTypePWM(GPIO_PORTD_BASE, GPIO_PIN_0 | GPIO_PIN_1);
//
// Compute the PWM period based on the system clock.
//
ulPeriod = SysCtlClockGet() / 50000;
//
// Set the PWM period to 50 kHz.
//
PWMGenConfigure(PWM_BASE, PWM_GEN_0,
                  PWM_GEN_MODE_UP_DOWN | PWM_GEN_MODE_NO_SYNC);
PWMGenPeriodSet(PWM_BASE, PWM_GEN_0, ulPeriod);
//
// Set PWM0 to a duty cycle of 25% and PWM1 to a duty cycle of 75%.
//
PWMPulseWidthSet(PWM_BASE, PWM_OUT_0, ulPeriod / 4);
PWMPulseWidthSet(PWM_BASE, PWM_OUT_1, ulPeriod * 3 / 4);
//
// Enable the PWM0 and PWM1 output signals.
//
PWMOutputState(PWM_BASE, PWM_OUT_0_BIT | PWM_OUT_1_BIT, true);
//
// Enable the PWM generator.
//
PWMGenEnable(PWM_BASE, PWM_GEN_0);
//
// Loop forever while the PWM signals are generated.
//
while(1)
{
}
}
第二，原理图及测试结果