Hi,
I tried to toggle the GPIO14 and GPIO15 on each CPU timer 1 interrupt. However it does not work properly.
CASE 1 : Only GPIO15 gives square wave, GPIO14 is always high with glitches
__interrupt void cpu_timer1_isr(void)
{
CpuTimer1.InterruptCount++;
if (CpuTimer1.InterruptCount&1)
{
EALLOW;
GpioDataRegs.GPADAT.bit.GPIO14 = 0;
GpioDataRegs.GPADAT.bit.GPIO15 = 1;
EDIS;
}
else
{
EALLOW;
GpioDataRegs.GPADAT.bit.GPIO14 = 1;
GpioDataRegs.GPADAT.bit.GPIO15 = 0;
EDIS;
}
EALLOW;
WdRegs.WDKEY.bit.WDKEY = 0x00AA;
EDIS;
}
CASE 2 : Only GPIO14 gives square wave, GPIO15 is always low with glitches
__interrupt void cpu_timer1_isr(void)
{
CpuTimer1.InterruptCount++;
if (CpuTimer1.InterruptCount&1)
{
EALLOW;
GpioDataRegs.GPADAT.bit.GPIO15 = 1;
GpioDataRegs.GPADAT.bit.GPIO14 = 0;
EDIS;
}
else
{
EALLOW;
GpioDataRegs.GPADAT.bit.GPIO15 = 0;
GpioDataRegs.GPADAT.bit.GPIO14 = 1;
EDIS;
}
EALLOW;
WdRegs.WDKEY.bit.WDKEY = 0x00AA;
EDIS;
}
CASE 3: Both the GPIO14 & GPIO15 are square wave
__interrupt void cpu_timer1_isr(void)
{
CpuTimer1.InterruptCount++;
if (CpuTimer1.InterruptCount&1)
{
EALLOW;
GpioDataRegs.GPADAT.all = 0x00008000;
EDIS;
}
else
{
EALLOW;
GpioDataRegs.GPADAT.all = 0x00004000;
EDIS;
}
EALLOW;
WdRegs.WDKEY.bit.WDKEY = 0x00AA;
EDIS;
}
CASE 4: None of the GPIO14 & GPIO15 are square wave
__interrupt void cpu_timer1_isr(void)
{
CpuTimer1.InterruptCount++;
if (CpuTimer1.InterruptCount&1)
{
EALLOW;
GpioDataRegs.GPADAT.all = (GpioDataRegs.GPADAT.all | 0x00008000);
EDIS;
}
else
{
EALLOW;
GpioDataRegs.GPADAT.all = (GpioDataRegs.GPADAT.all | 0x00008000);
EDIS;
}
EALLOW;
WdRegs.WDKEY.bit.WDKEY = 0x00AA;
EDIS;
}
I could not understand why the cases 1, 2 and 3 are not working properly. Please help.
-Shambhu
