GTimerClass Class

GTimerClass Class

Description
A class used for initializing, starting, stopping Gtimer.

Syntax
class GTimerClass

Members

Public Constructors 
GTimerClass::GTimerClassConstructs a GTimerClass object.
Public Methods 
GTimerClass::beginInitialize a timer and start it immediately.
GTimerClass::stopStop a specific timer.
GTimerClass::reloadReload a specific timer.
GTimerClass::read_usRead current countdown value.

GTimerClass::begin

Description
Initialize a timer and start it immediately.

Syntax
void begin(uint32_t timerid, uint32_t duration_us, void (*handler)(uint32_t), bool periodical = true, uint32_t userdata = 0, uint32_t timer0_clk_sel = 0);

Parameters
timerid: There are 5 valid GTimer with timer id 0 to 4.
duration_us: The duration of timer. The time unit is microsecond and the precision is 32768Hz.
handler: As timer timeout, it would invoke this handler.
periodical: By default, the timer would keep periodically countdown and reload which leads the handler periodically invoked.
userdata: The user data brings to the handler. Default value is 0.
timer0_clk_sel: Select the timer0 clock, 0 for 40MHz or 1 for 4MHz. Default value is 0.

Returns
NA

Example Code
Example: TimerOneshot, TimerPeriodical

Notes and Warnings
“GTimer.h” must be included to use the class function.

GTimerClass::stop

Description
Stop a specific timer.

Syntax
void stop(uint32_t timerid);

Parameters
timerid: Stop the timer with its timer id 0 to 4.

Returns
NA

Example Code
Example: TimerOneshot, TimerPeriodical

Notes and Warnings
“GTimer.h” must be included to use the class function.

GTimerClass::reload

Description
Reload a specific timer. The GTimer is a countdown timer. Reload it would make it discard the current countdown value and restart countdown based on the duration.

Syntax
void refresh(uint32_t timerid, uint32_t duration_u);

Parameters
timerid: The timer to be modified with its timer id 0 to 4.
duration_us: The updated duration in unit of microseconds. (1 to 10000)

Returns
NA

Example Code
Example: TimerOneshot, TimerPeriodical

Notes and Warnings
“GTimer.h” must be included to use the class function.

GTimerClass::read_us

Description
Read current countdown value.

Syntax
void reload(uint32_t timerid, uint32_t duration_us);

Parameters
timerid: The timer to be read with its timer id 0 to 4.

Returns
The current countdown value in microseconds.

Example Code
Example: TimerOneshot, TimerPeriodical

Notes and Warnings
“GTimer.h” must be included to use the class function.

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