timeout.c File Reference

Core timeout library. More...

#include "timeout.h"
#include "core_config.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stm32g4xx_hal.h>

Functions
bool	core_timeout_insert (core_timeout_t *timeout)
	Add a timeout to the internal list of timeouts to be monitored.
void	core_timeout_start_all ()
	Enable all timeouts currently in the internal timeout list.
void	core_timeout_reset_by_module_ref (void *module, uint32_t ref)
	Reset a timeout given the module and the refernce number.
void	core_timeout_reset (core_timeout_t *timeout)
	Reset a timeout given a pointer to the timeout struct.
void	core_timeout_check_all ()
	Check all timeouts currently stored in the internal timeout list.
void	core_timeout_suspend (core_timeout_t *timeout)
	Suspend timeout.
void	core_timeout_resume (core_timeout_t *timeout)
	Resume suspended timeout.
void	core_timeout_hard_reset (core_timeout_t *timeout)
	Force reset a timeout.

Detailed Description

Core timeout library.

This core library component can be used to set timeouts for both software events and core library events. Timeouts are specified by a core_timeout_t struct.

Typical initialization

1. Initialize a core_timeout_t struct for each timeout
   • Set the timeout member to the desired timeout length in milliseconds
   • Set the callback member to the timeout's callback function. When the function is called, a pointer to the struct defining the timeout that called the callback function is passed to it.
   • Set the module and ref members. See below.
   • Set the 'check' member. See below.
2. Add the timeout structs to the internal list with core_timeout_insert()
3. Start all of the timeouts with core_timeout_start_all()
4. Call core_timeout_check_all at regular intervals. If a timeout has elapsed, the handler is called. Timeouts are checked in the order they are added.
5. Reset timeouts as needed with the core_timeout_reset() function.

module and ref

The module and ref members of the core_timeout_t struct can be used to define timeouts that are automatically reset by other core library components. To reset these timeouts, the core_timeout_reset_by_module_ref() function is used. The module member is set to a register struct defined by the HAL (e.g. FDCAN1, SPI1, USART3, etc.). The meaning of ref depends on the selected module. Currently, the modules that support this feature are:

1. FDCAN1, FDCAN2, and FDCAN3: The timeout is reset when a frame with an ID equal to the value of ref is received

Timeouts with a module not in the above list will never be reset by the core library. Thus, the user can define timeouts where module is NULL or equal to a custom value and reset them using the core_timeout_reset_by_module_ref() function.

check

The 'check' member can be implemented to have the timeout library automatically check whether or not a timeout should be reset. The 'check' member should point to a function returning a bool value, true if the timeout should be reset, false if not. This is checked inside the core_timeout_check_all function.

latching

Set this member to 1 to not allow it to be reset by a normal reset function. A timeout with this parameter set can only be reset through the core_timeout_hard_reset function.

single_shot

Set this member to 1 to only have callback trigger once, the first time the timeout has hit its limit.

Function Documentation

core_timeout_hard_reset()

void core_timeout_hard_reset

(

core_timeout_t *

timeout

)

Force reset a timeout.

Parameters

timeout

Pointer to timeout being reset

core_timeout_insert()

bool core_timeout_insert

(

core_timeout_t *

timeout

)

Add a timeout to the internal list of timeouts to be monitored.

Parameters

timeout

Pointer to the timeout

Return values

1	if there is enough space
0	otherwise

core_timeout_reset()

void core_timeout_reset

(

core_timeout_t *

timeout

)

Reset a timeout given a pointer to the timeout struct.

Parameters

timeout

Pointer to the timeout being reset

core_timeout_reset_by_module_ref()

void core_timeout_reset_by_module_ref	(	void *	module,
		uint32_t	ref )

Reset a timeout given the module and the refernce number.

Parameters

module	Module that is calling this function
ref	Reference number

core_timeout_resume()

void core_timeout_resume

(

core_timeout_t *

timeout

)

Resume suspended timeout.

Parameters

timeout

Pointer to the timeout being resumed

core_timeout_suspend()

void core_timeout_suspend

(

core_timeout_t *

timeout

)

Suspend timeout.

Parameters

timeout

Pointer to the timeout being suspended