Delay Function using TIM$2$ in Count up Overflow Mode

Configure TIM$2$ to overflow every $1$ms in count up mode to create your own HAL delay

function. This is done by enabling TIM$2$ and setting the prescaler $($PSC$)$ and auto$-$reload

value $($ARR$).$ It is recommended to read up on Chapter $22\mathrm{.}3\mathrm{.}2$ of the datasheet to

understand the principles of different counter modes.

The instructions to do so are as follows.

$1.$ Enable TIM$2$ in the $$Reset and Clock Control$.$

$2.$ Set TIM$2$ in count up mode.

$3.$ Set the Prescaler $($PSC$)$ and Auto$-$Reload Register $($ARR$)$ values.

$4.$ Enable TIM$2$ on the $$Control Register.$$

$5.$ Use TIM$2$ to generate your own HAL delay function.

To set the PSC and ARR values, the following relationship needs to be used.

F$\_$event $=($Fclk$)/(($PSC $+1)($ARR $+1))$

Where the Fclk is the frequency of the system clock defined by the $$APB Timer Clocks$$ in

CubeIDE$$s clock configuration. The overflow value is set by the ARR.

The delay function should have a similar format to what is shown. Call this function in

the main while loop and set a delay value $($in milliseconds$).$

void my$\_$delay$\_$ms$($uint$32\_$t ms$)$

$\{$

$//$ Read from TIM$2$ counter and increment a variable.

$//$ Clear the status register and repeat until the millis$\_$val.

TIM$2->$SR &$=$ ~$(1<<0)$;

$\}$