Tool/software: Code Composer Studio
Hi
I need to generate two signals for driving a device, one at 25 Hz and another one to 1.4MHz. I have been testing with the code below but I can only achieve 645 kHz even setting the Load to 1.4Mhz, is there something am I doing wrong?
I can also notice that in some frequencies the duty cycle changes with no reason since I left it on 50%. I am trying to figure out what is happening on the datasheet and the TIVA peripherals library but since I am beginner with the Tiva C any help is appreciated.
Thanks in advance
Isra
#include <stdint.h>
#include <stdbool.h>
#include "inc/tm4c123gh6pm.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"
int main(void)
{
uint32_t ui32Period;
//SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);
SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);
SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
ui32Period = (SysCtlClockGet()/25) / 2 ;
TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period -1);
IntEnable(INT_TIMER0A);
TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
//IntMasterEnable();
TimerEnable(TIMER0_BASE, TIMER_A);
SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
TimerConfigure(TIMER2_BASE, TIMER_CFG_PERIODIC);
ui32Period = (SysCtlClockGet()/10) / 2;
TimerLoadSet(TIMER2_BASE, TIMER_A, ui32Period -1);
IntEnable(INT_TIMER2A);
TimerIntEnable(TIMER2_BASE, TIMER_TIMA_TIMEOUT);
//IntMasterEnable();
TimerEnable(TIMER2_BASE, TIMER_A);
SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
TimerConfigure(TIMER1_BASE, TIMER_CFG_PERIODIC);
ui32Period = (SysCtlClockGet()/1400000) /2 ;
TimerLoadSet(TIMER1_BASE, TIMER_A, ui32Period -1);
IntEnable(INT_TIMER1A);
TimerIntEnable(TIMER1_BASE, TIMER_TIMA_TIMEOUT);
IntMasterEnable();
TimerEnable(TIMER1_BASE, TIMER_A);
while(1)
{
}
}
void Timer0IntHandler(void)
{
// Clear the timer interrupt
TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
// Read the current state of the GPIO pin and
// write back the opposite state
if(GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_2))
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, 0);
}
else
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 4);
}
}
void Timer1IntHandler(void)
{
// Clear the timer interrupt
TimerIntClear(TIMER1_BASE, TIMER_TIMA_TIMEOUT);
// Read the current state of the GPIO pin and
// write back the opposite state
if(GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_1))
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, 0);
}
else
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, 2);
}
}
void Timer2IntHandler(void)
{
// Clear the timer interrupt
TimerIntClear(TIMER2_BASE, TIMER_TIMA_TIMEOUT);
// Read the current state of the GPIO pin and
// write back the opposite state
if(GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_3))
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, 0);
}
else
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, 8);
}
}
