S12G128 How to use Timer TC0 with PTT0 as GPIO

lukmankurniawan — Thu, 06 Sep 2018 08:42:58 GMT

Hello,

Currently I use S12G128 MCU 48pins and using TC0 in timer interrupt to set the period of pulse. In the same time I also use PTT0 as GPIO pin for PUSH Button Input because I will use the other pins for another purpose . But The PTT0 GPIO pins looks got affected by the TC0, how to avoid PTT0 get affected by TC0?
My code is as below:

#include <hidef.h> /* common defines and macros */
#include "derivative.h" /* derivative-specific definitions */

#define PERIOD 750

#define UP_1 PTT_PTT0 //button up1

#define DOWN_1 PTT_PTT1 //button down1

long time_count;

//==============================================================================
//SetPEEmodeBUSCLK
//==============================================================================
void SetPEEmodeBUSCLK(byte _synr, byte _refdv, byte _postdiv)
{

CPMUSYNR = _synr;
CPMUREFDIV = _refdv;
CPMUPOSTDIV = _postdiv;

CPMUOSC_OSCE = 1; //enable external oscillator OSCE

while(!CPMUFLG_UPOSC)
{// you can check for timeot here with error message report
};
while(!CPMUFLG_LOCK)
{// you can check for timeot here with error message report
};

//--- select clocks --------------------
CPMUCLKS = 0B10000011; // bus=fPLL/2; COP is clocked from OSCCLK
if(CPMUCLKS != 0B10000011) // After writing CPMUCLKS register, it is strongly recommended to read
{ // back CPMUCLKS register to make sure that write of PLLSEL,
asm nop; // RTIOSCSEL, COPOSCSEL0 and COPOSCSEL1 was successful.
}
//--------------------------------------
}

//==============================================================================
//TC0_ISR
//==============================================================================
#pragma CODE_SEG NON_BANKED
interrupt 8 void TC0_ISR(void)
{

PTP_PTP4 = ~PTP_PTP4; //toggle PTP4
PORTD_PD0 = ~PORTD_PD0; //toggle PTD0
time_count++;
TC0 = TC0 + PERIOD;
TFLG1=0x01;

}
#pragma CODE_SEG DEFAULT

//==============================================================================
//Timer_Init
//==============================================================================
void Timer_Init(void)
{

TIOS = 0x01; //channel 0 as output compare
TIE = 0x01; //interrupt enable
TSCR2 = 0x03; //prescaler = 8
TC0 = PERIOD;
TSCR1 = 0xA0; //timer enabled
}

void main(void) {
/* put your own code here */

ECLKCTL_NECLK = 1; // enable ECLK output (bus clock is visible on pin PB0 for TWR-S12G128)
SetPEEmodeBUSCLK(0x02, 0x80, 0x00); //24Mhz BUSCLK from 8 MHZ oscclk, PEE mode
DDRD = 0x0F; //LEDs output
DDRP = 0x0F; //LEDs output

DDRT=0x00; Port T as Input

PTP_PTP1=0;

PTP_PTP2=0;
Timer_Init();

EnableInterrupts;

for(;;)
{
_FEED_COP();

if (UP_1==0)

{ PTP_PTP1=0;}
else { PTP_PTP1=1;}

if (DOWN_1==0)

{ PTP_PTP2=0;}
else { PTP_PTP2=1;}

}

}

Thanks & Regards,

Lukman

Re: S12G128 How to use Timer TC0 with PTT0 as GPIO

danielmartynek — Tue, 11 Sep 2018 14:10:58 GMT

Hi,
Have your tried reading PTIT (Port T Input Register) instead of PTT (Port T Data Register)?

Regards,
Daniel

Re: S12G128 How to use Timer TC0 with PTT0 as GPIO

lukmankurniawan — Wed, 12 Sep 2018 08:55:56 GMT

Hello Daniel,

Thanks for your response, for this case, I already solve the problem with disconnect the OCPD channel 0.

I put OCPD_OCPD0=1; on my Timer_Init.

Thanks & appreciate your response.

Best Regards,

Lukman

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