TM4C123 - Timer 테스트
TM4C123의 페리는 정말 막강한데12개의 타이머와 20개의 PWM을 출력 할 수 있다. 그리고 마음에 드는 사항이 64bit 타이머가 6개 있다.
TM4C123의 타이머 관련 특징
■ 16/32-bit operating modes:
-16- or 32-bit programmable one-shot timer
-16- or 32-bit programmable periodic timer
-16-bit general-purpose timer with an 8-bit prescaler
-32-bit Real-Time Clock (RTC) when using an external 32.768-KHz clock as the input
-16-bit input-edge count- or time-capture modes with an 8-bit prescaler
-16-bit PWM mode with an 8-bit prescaler and software-programmable output inversion of the PWM signal
■ 32/64-bit operating modes:
-32- or 64-bit programmable one-shot timer
-32- or 64-bit programmable periodic timer
-32-bit general-purpose timer with a 16-bit prescaler
-64-bit Real-Time Clock (RTC) when using an external 32.768-KHz clock as the input
-32-bit input-edge count- or time-capture modes with a16-bit prescaler
-32-bit PWM mode with a 16-bit prescaler and software-programmable output inversion of the PWM signal
■ Count up or down
■ Twelve 16/32-bit Capture Compare PWM pins (CCP)
TM4C123의 타이머 블록도
TM4C123 타이머 CCP 핀맵
TM4C123 타이머 초기화 함수
void InitTimer0(void)
{
// Enable the peripherals used by this example.
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
// Enable processor interrupts.
ROM_IntMasterEnable();
// Configure the two 32-bit periodic timers.
ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
//1ms
ROM_TimerLoadSet(TIMER0_BASE, TIMER_A, ROM_SysCtlClockGet()/1000);
// Setup the interrupts for the timer timeouts.
ROM_IntEnable(INT_TIMER0A);
ROM_TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
// Enable the timers.
ROM_TimerEnable(TIMER0_BASE, TIMER_A);
}
TM4C123 타이머 인터럽트 핸들러
void Timer0IntHandler(void)
{
// Clear the timer interrupt.
ROM_TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
gTimeTick1++;
}
TM4C123 타이머 예제 소스코드
int main(void)
{
int cnt = 0;
SystemInit();
Led1Init();
Led1On();
Led2Init();
Led2On();
DebugInit(BAUD_115200);
DebugPrint("TM4C123 Timer Test\r\n");
InitTimer0();
while(1)
{
if(gTimeTick1>1000)
{
gTimeTick1 = 0;
Led1Toggle();
}
}
}
