Developing the timer driver
In this section, we will apply the knowledge gained about the TIM peripheral to develop a driver for generating delays.
First, create a copy of your previous project in your IDE, following the steps outlined in earlier chapters. Rename this copied project GTIM. Next, create a new file named tim.c in the Src folder and another file named tim.h in the Inc folder.
Our goal is to develop a driver that initializes TIM2 to generate a 1 Hz timeout. Populate your tim.c file with the following code:
#include "tim.h"
#define TIM2EN (1U<<0)
#define CR1_CEN (1U<<0)
void tim2_1hz_init(void)
{
/*Enable clock access to tim2*/
RCC->APB1ENR |=TIM2EN;
/*Set prescaler value*/
TIM2->PSC = 1600 - 1 ;
/*Set auto-reload...
