esp32 wroom kit and zephyr timer1 counter

[GastonMelo]

Hi to all, Im new to zephyr and I tried to create a pwm output using timer1. In the overlay file I set the timer1 prescaler to 2 and status okay. With this presacaler setting I'm able to get 100Khz freq output, but why? Shouldn't be able to reach in the Mhz freq?

&timer1 { status = "okay"; compatible = "espressif,esp32-timer"; index = < 0x1 >; prescaler = <0>; };
in the main.c source I got this:

`
const struct device *timer1_dev =
DEVICE_DT_GET(DT_NODELABEL(timer1));
if(!device_is_ready(timer1_dev))
{
LOG_ERR("timer0 not ready");
return;
}

ret=counter_start(timer1_dev);
struct counter_alarm_cfg timer1_alarm_config = {
.callback = timer1_callback,
.ticks = 40,
.user_data = &timer1_alarm_config,
.flags = COUNTER_ALARM_CFG_EXPIRE_WHEN_LATE,
};
ret = counter_set_channel_alarm(timer1_dev, 0, &timer1_alarm_config);
if(ret<0)
{
LOG_ERR("error starting timer0");
}
while(true)
{
k_sleep(K_FOREVER);
// gpio_pin_toggle_dt(&reset_pin);
// k_msleep(100);
}
return 0;
`

and in the callback function I got this:

`
int ret;

struct counter_alarm_cfg *config = user_data;
config->ticks = 40;
config->flags=COUNTER_ALARM_CFG_EXPIRE_WHEN_LATE;
ret = gpio_pin_toggle_dt(&led);
ret = counter_set_channel_alarm(timer1_dev, 0,
user_data);
`
A couple of strange things happens:

1. the counter stops after a few minutes
   2)the freq only reach 100Khz

is there a prescaler somewhere else that I need to set to be able to work with Mhz freq?
why the counter stops?

Thanks
Gaston