WCH CH5xx Timer Alias Helper

Easily switch between timers and their corresponding GPIO pins

This header file maps TMR[A-D] to TMR[0-3] during compilation, no runtime overhead is added. The static mapping can be defined in the head of the program.

	Pin	Alt. Pin
TMR0	PA9	PB23
TMR1	PA10	PB10	(DMA)
TMR2	PA11	PB11	(DMA)
TMR3	PB22	PA2

Copy the timer_alias.h file to your source folder or include directory.

Example usage:

// select a timer (0 to 3)
#define TMRA_TARGET 3
// leave out or set to FALSE for default pin
#define TMRA_ALT_PIN TRUE
// header file has to be included last
#include "timer_alias.h"

In your application you can do now:

// resolves to nothing if remapping is not required
TMRA_GPIO_MaybePinRemap();

TMRA_GPIO_ModeCfg(GPIO_ModeOut_PP_5mA);
TMRA_GPIO_SetBit();
TMRA_GPIO_ResetBit();
TMRA_PFIC_EnableIRQ();
TMRA_PFIC_DisableIRQ();
printf("timer pin: " TMRA_PIN_NAME);

All other (timer specific) functions resemble exactly the original, just replacing TMR[0-3] with TMR[A-D]. For example:

TMRA_CAPTimeoutCfg(FREQ_SYS / 1000);
TMRA_ITCfg(ENABLE, TMR0_3_IT_DATA_ACT | TMR0_3_IT_CYC_END);
TMRA_CapInit(Edge_To_Edge);
uint32_t tick = TMRA_GetCurrentTimer();

Interrupt handlers are supported, so

#define TMRC_TARGET 2
#include "timer_alias.h"

void TMRC_IRQHandler(void)
{
  if (TMRC_GetITFlag(TMR0_3_IT_DATA_ACT)) {
    TMRC_ClearITFlag(TMR0_3_IT_DATA_ACT);
  }
}

becomes

void TMR2_IRQHandler(void)
{
  if (TMR2_GetITFlag(TMR0_3_IT_DATA_ACT)) {
    TMR2_ClearITFlag(TMR0_3_IT_DATA_ACT);
  }
}

and then

void TMR2_IRQHandler(void)
{
  if (((*((PUINT8V)0x40002806)) & 0x02)) {
    ((*((PUINT8V)0x40002806)) = 0x02);
  }
}