Hi,
Easily in the attached project you can find an example for 250ms period. The definition of value TIM0_TC0_INCREMENT defines period of TC0 interrupt. If you require anothe period just recalculate on the basis of you BUSCLK.
period = (PRS+1)* TIM0_TC0_INCREMENT/ BUSCLK =
= 250 * BUSCLK*1000 / BUSCLK = 250,000 us = 0.25s
Of course the project contains more examples on different peripherals but you should look only for TIM0_Channel0_ISR, TIM0_Init (TIM0.c, TIM0.h) and possible principle of interrupt functions definition in the InterruptVectorTable.c
*******************************************************************************/
#pragma CODE_SEG NON_BANKED
/* added -ansi off to compiler option; Project->Properties->Compiler->General*/
interrupt void TIM0_Channel0_ISR(void) // vector defined in the prm file
{
TIM0TC0 = TIM0TCNT + TIM0_TC0_INCREMENT;
TIM0TFLG1 = 0B00000001; // clear flag from channel 0
PTS_PTS4 = ~PTS_PTS4; // do anything
}
#pragma CODE_SEG DEFAULT
/*******************************************************************************
Function Name : TIM0_Init
Engineer : xxxx
Date : Dec-14-2013
Parameters : NONE
Modifies : TIM0 setup registers
Returns : NONE
Notes : period 0.25sec
period = (PRS+1)* TIM0_TC0_INCREMENT/ BUSCLK =
= 250 * BUSCLK*1000 / BUSCLK = 250,000 us = 0.25s
Issues : NONE
*******************************************************************************/
void TIM0_Init(void)
{
SET_INTERRUPT_PRIORITY(TIM0_Channel0_VEC_OFF, 3); // priority 3 FOR TIM_CH0 OC
TIM0TIOS = 0B00000001; // Channel0 output compare
TIM0TCTL2 = 0B00000000; // no output compare action at pin
TIM0TFLG1 = 0B11111111; // clear all flags
TIM0TIE = 0B00000001; // enable OC from Channel0
TIM0PTPSR = 249; // prescaler 250
TIM0TC0 = TIM0TCNT + TIM0_TC0_INCREMENT;
TIM0TSCR1 = 0B11101000; // Timer enable, stop in wait and BDM mode,
// no fast flag clear, precise prescaler
}
Best regards,
Ladislav
