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Hi Support team,
I have a customer with the following timer question, could you advise:
I have a question. I want to have a timer in continuous mode toggling a port at a specified frequency.
However, I’d like to have a 2nd timer change the reload value so that the frequency of the first timer will sweep smoothly without a sudden change in the freq.
If I use ROM_TimerLoadSet then it’s very possible the timer value could change before it counts down to 0 and toggles the port. This can cause the duty cycle of the output to vary in undesirable ways during the transition.
Is there a way to change the reload register without affecting the countdown register?
We are using a Tiva TM4C129x.
30.2.1.20 ROM_TimerLoadSet
Sets the timer load value.
Prototype:
void
ROM_TimerLoadSet(uint32_t ui32Base,
uint32_t ui32Timer,
uint32_t ui32Value)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_TIMERTABLE is an array of pointers located at ROM_APITABLE[11].
ROM_TimerLoadSet is a function pointer located at ROM_TIMERTABLE[14].
Parameters:
ui32Base is the base address of the timer module.
ui32Timer specifies the timer(s) to adjust; must be one of TIMER_A, TIMER_B, or
TIMER_BOTH. Only TIMER_A should be used when the timer is configured for full-width
operation.
ui32Value is the load value.
Description:
This function configures the timer load value; if the timer is running then the value is immediately
loaded into the timer.
Returns:
None
Regards
Jeff
