Timer Prescaler

[Lorens]

I have a problem enabling TIMER1: If the prescaler is set between 16MHz and 2 MHz the firmware fails to enable the SoftDevice, even if I didn't manage TIMER0, but TIMER1 which should be dedicated to the softDevice. Using a lower prescaler instead it works. I enable the timer before enabling SoftDevice.

I am working on NRF51822 with softdevice S110 8.0.0.

Am I doing ssomething wrong or not alloweed?

Thank you

[Susheel Nuguru]

Which timer did you use , Timer0 or Timer1? Timer0 is restricted and is used by softdevice. Applications cannot use it (unless you are using Timeslot API)

can you put some code snippets for us to see what you are trying to do and what you want to achieve?

[Lorens]

Here there are a few character so I use an answer.

[Lorens]

I use Timer1, for the reason you mentioned.

Here some parts of the Code:

#define TIMER1_ENABLED 1

#if (TIMER1_ENABLED == 1)
#define TIMER1_CONFIG_FREQUENCY    NRF_TIMER_FREQ_1MHz
#define TIMER1_CONFIG_MODE         TIMER_MODE_MODE_Timer
#define TIMER1_CONFIG_BIT_WIDTH    TIMER_BITMODE_BITMODE_16Bit
#define TIMER1_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_HIGH

#define TIMER1_INSTANCE_INDEX      (TIMER0_ENABLED)
#endif

Here the initialization:

    Timer_DRV.p_reg 			= NRF_TIMER1;
Timer_DRV.irq					= TIMER1_IRQn;
Timer_DRV.instance_id = TIMER1_INSTANCE_INDEX;

Timer_DRV_Conf.frequency					= TIMER1_CONFIG_FREQUENCY;
Timer_DRV_Conf.mode								= TIMER1_CONFIG_MODE;
Timer_DRV_Conf.bit_width					= TIMER1_CONFIG_BIT_WIDTH;
Timer_DRV_Conf.interrupt_priority	= TIMER1_CONFIG_IRQ_PRIORITY;
Timer_DRV_Conf.p_context					= timer_struct;

nrf_drv_timer_init(&Timer_DRV,
                          &Timer_DRV_Conf,
                          timer_clk_handler);

And then configuration interrupt:

            nrf_drv_timer_compare(&Timer_DRV, NRF_TIMER_CC_CHANNEL0, 60, true);
	nrf_drv_timer_compare(&Timer_DRV, NRF_TIMER_CC_CHANNEL1, 120, true);
	nrf_drv_timer_compare(&Timer_DRV, NRF_TIMER_CC_CHANNEL2, 180, true);
	nrf_drv_timer_extended_compare(&Timer_DRV, NRF_TIMER_CC_CHANNEL3, 240, NRF_TIMER_SHORT_COMPARE3_CLEAR_MASK,
                                    true);

Thank you

[Susheel Nuguru]

You code looks correct (except that i cannot see values of some defines) What is the symptoms you are seeing? is your handler not triggering correctly with softdevice? You description in the question was not so clear about the problem

[Lorens]

Looking at the behaviour it seems that calling the function: SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false); it has some problem. While not enabling the timer1 it works correctly. The defines are the ones provided by Nordic SDK, the define #define TIMER1_INSTANCE_INDEX (TIMER0_ENABLED) is 0 because there is no TIMER0 enabled

If there are any other things you need to clarify the situation just ask.

Thanks