how to write a driver about am5728 use timer to capture pwm

To write a driver about AM5728 using timer to capture PWM, you can follow these steps:

1. Configure the timer module to capture the PWM signal.
2. Enable the timer module and set it to capture mode.
3. Configure the pinmux for the PWM input pin to select the timer as the input source.
4. Set up an interrupt to handle the timer capture event.
5. In the interrupt handler, read the timer value to get the PWM duty cycle.

Here is a sample code snippet to illustrate the basic structure of the driver:

void pwm_capture_init(void) {
    // Configure the timer module
    timer_config(timer_base_addr, TIMER_CAPTURE_MODE);

    // Configure the pinmux for the PWM input pin
    pinmux_config(pwm_input_pin, PINMUX_TIMER_INPUT);

    // Set up an interrupt to handle the timer capture event
    irq_setup(irq_num, pwm_capture_handler);
}

void pwm_capture_handler(void) {
    // Read the timer value to get the PWM duty cycle
    uint32_t timer_value = timer_read(timer_base_addr);
    uint32_t pwm_duty_cycle = calculate_pwm_duty_cycle(timer_value);

    // Do something with the PWM duty cycle value
    do_something(pwm_duty_cycle);
}

Note that you will need to fill in the details for the `timer_config`, `pinmux_config`, `irq_setup`, `timer_read`, `calculate_pwm_duty_cycle`, and `do_something` functions based on the specific implementation details of your system.