Dear Team,
what is the way to do it in Zephyr?
I have a signal up-to 10kHz, what is the best way to keep the counter in the background?
Thank you and best
Oleh
Dear Team,
what is the way to do it in Zephyr?
I have a signal up-to 10kHz, what is the best way to keep the counter in the background?
Thank you and best
Oleh
Hi.
You can use Zephyr's GPIO driver to configure interrupts.
Have a look at the documentation here.
Best regards,
Didrik
Hi Didrik,
thank you, I'm new to Zephyr so trying to map my nrf knowledge to zephyr
To complement and test the counter on gpio, I thought to put the second DevKit board into generation mode. Could you please point on the right track with how can the generation on-off be done in background on Zephyr?
thanks & best
Oleh
Yes, you can use GPIOTE and DPPI on the nRF91.
It looks like Zephyr's GPIO driver uses GPIOTE internally.
The PPI trace sample works with both nRF91 and nRF52 and might be a good starting point on how to use DPPI.
thanks for the hint! I'm trying it out...
first blocker was: https://devzone.nordicsemi.com/f/nordic-q-a/49657/how-to-link-nrfx-gpiote-and-ppi-in-zephyr/198090#198090 when adding the config -- it picked up.
second blocker is "GPIOTE_IRQn undeclared" for nRF9160 (there are two: GPIOTE0_IRQn/GPIOTE0_IRQn defined in \zephyr\ext\hal\nordic\nrfx\mdk\nrf9160.h)
am I missing something? Or was the ppi_trace never configured+tested on nRF9160?
Thanks!
The ppi_trace sample worked for me.
I did not get any build errors.
However, I did have to change the pins used to 10, 11, and 12. You can do this in the Kconfig file in the sample, or by adding the relevant configurations in the prj.conf file.
Also, the sample should be built as a secure application (use target nrf9160_pca10090, no ns).
aha! that was the missing part, thank you!
I will try for the Secure board.
In order to use DPPI on the NonSecure, would this be sufficient:
PERIPH("NRF_DPPI", NRF_DPPIC_NS, CONFIG_SPM_NRF_DPPIC_NS), // adding to spm.c in the periph_cfg periph[]
And also:
if (IS_ENABLED(CONFIG_SPM_NRF_GPIOTE1_NS)) {
/* Configure DPPI to be Non-Secure */
NRF_SPU->DPPI[0].PERM = 0;
}
thank you!
Almost.
In addition to
PERPIH("NRF_DPPI", NRF_DPPIC_NS, CONFIG_SPM_NRF_DPPIC_NS),in spm.c:304 and
if (IS_ENABLED(CONFIG_SPM_NRF_GPIOTE1_NS)) { NRF_SPU->DPPI[0].PERM = 0; }in spm.c:326
I also had to add
PERIPH("NRF_RTC0", NRF_RTC0, CONFIG_SPM_NRF_RTC0_NS),in spm.c:305,
config SPM_NRF_DPPIC_NS bool "DPPI is Non-Secure" default y config SPM_NRF_RTC0_NS bool "RTC0 is Non-Secure" default yin ncs/nrf/subsys/spm/Kconfig:180, and
CONFIG_PPI_TRACE_PIN_RTC_COMPARE_EVT=10 CONFIG_PPI_TRACE_PIN_RTC_TICK_EVT=11 CONFIG_PPI_TRACE_PIN_LFCLOCK_STARTED_EVT=12in prj.conf
Almost.
In addition to
PERPIH("NRF_DPPI", NRF_DPPIC_NS, CONFIG_SPM_NRF_DPPIC_NS),in spm.c:304 and
if (IS_ENABLED(CONFIG_SPM_NRF_GPIOTE1_NS)) { NRF_SPU->DPPI[0].PERM = 0; }in spm.c:326
I also had to add
PERIPH("NRF_RTC0", NRF_RTC0, CONFIG_SPM_NRF_RTC0_NS),in spm.c:305,
config SPM_NRF_DPPIC_NS bool "DPPI is Non-Secure" default y config SPM_NRF_RTC0_NS bool "RTC0 is Non-Secure" default yin ncs/nrf/subsys/spm/Kconfig:180, and
CONFIG_PPI_TRACE_PIN_RTC_COMPARE_EVT=10 CONFIG_PPI_TRACE_PIN_RTC_TICK_EVT=11 CONFIG_PPI_TRACE_PIN_LFCLOCK_STARTED_EVT=12in prj.conf
Hi Didrik, thanks! that was to make the ppi_trace to work.
could you please help on wiring Counter and Timer to get it with DPPI as here: https://devzone.nordicsemi.com/f/nordic-q-a/9036/measuring-input-gpio-pin-frequency-with-soft-device-running ?
am I on the right way?
static void timer_init() { NRF_TIMER1_NS->TASKS_STOP = 1; NRF_TIMER1_NS->MODE = TIMER_MODE_MODE_Timer; NRF_TIMER1_NS->PRESCALER = 8; // Fhck / 2^8 NRF_TIMER1_NS->CC[0] = 62500; // 62500 - 1s NRF_TIMER1_NS->BITMODE = (TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos); NRF_TIMER1_NS->TASKS_CLEAR = 1; NRF_TIMER1_NS->INTENSET = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos); NRF_TIMER1_NS->EVENTS_COMPARE[0] = 0; } static void counter_init() { NRF_TIMER2_NS->TASKS_STOP = 1; NRF_TIMER2_NS->MODE = TIMER_MODE_MODE_Counter; NRF_TIMER2_NS->BITMODE = (TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos); NRF_TIMER2_NS->TASKS_CLEAR = 1; NRF_TIMER2_NS->EVENTS_COMPARE[0] = 0; } #define SENSE_PIN 13 static void gpiote_init(uint32_t pin) { NRF_GPIOTE1_NS->CONFIG[0] = 0x01 << 0; // MODE: Event NRF_GPIOTE1_NS->CONFIG[0] |= SENSE_PIN << 8; // Pin number NRF_GPIOTE1_NS->CONFIG[0] |= NRF_GPIOTE_POLARITY_LOTOHI << 16; // Event rising edge } static void ppi_timer_stop_counter_init() { //NRF_DPPIC_NS->CHEN |= 1 << 0; //*(&(NRF_DPPIC_NS->CH0_EEP)) = (uint32_t)&NRF_TIMER1_NS->EVENTS_COMPARE[0]; //*(&(NRF_DPPIC_NS->CH0_TEP)) = (uint32_t)&NRF_TIMER2_NS->TASKS_STOP; //NRF_DPPIC_NS->CHENSET |= 1 << 0; #define EVT_IX_TIMER1__COMPARE 1 #define TSK_IX_TIMER2__STOP_COUNTER 1 // Configure GPIOTE Index 0 to be an Event -> nrf_gpiote_event_configure(EVT_IX_TIMER1__COMPARE, nrf_timer_event_address_get(NRF_TIMER1_NS, NRF_TIMER_EVENT_COMPARE_1) ...); // Configure GPIOTE Index 1 to be a Task -> nrf_gpiote_task_configure(TSK_IX_TIMER2__STOP_COUNTER, nrf_timer_event_address_get(NRF_TIMER2_NS, NRF_TIMER_TASK_COUNT) ...); // Index 0 will Publish on DPPI Channel 0 nrf_gpiote_publish_set(NRF_GPIOTE_EVENTS_IN_0, DPPI_CHANNEL); // Index 1 will Subscribe on DPPI Channel 0 nrf_gpiote_subscribe_set(NRF_GPIOTE_TASKS_OUT_1, DPPI_CHANNEL); // Enable Publish and Subscribe nrf_gpiote_event_enable(EVT_IX_TIMER1__COMPARE); nrf_gpiote_task_enable(TSK_IX_TIMER2__STOP_COUNTER); // Enable DPPI Channel nrf_dppi_channels_enable(NRF_DPPIC, DPPI_BIT_SET(DPPI_CHANNEL)); } static void ppi_gpiote_counter_init() { NRF_DPPIC_NS->CHEN |= 1 << 1; *(&(NRF_DPPIC_NS->CH1_EEP)) = (uint32_t)&NRF_GPIOTE1_NS->EVENTS_IN[0]; *(&(NRF_DPPIC_NS->CH1_TEP)) = (uint32_t)&NRF_TIMER2_NS->TASKS_COUNT; NRF_DPPIC_NS->CHENSET |= 1 << 1; }
Hi, and apologies for the late answer.
I believe that most of the code you posted should work, but especially the parts concerning PPI would not work due to differences between PPI and DPPI.
I was able to port an example written by Jared for another case. The sample is made to measure much higher frequencies than what you have, so you might want to edit some of the timer configurations in main().
To make the sample compile, you must also add
#define GPIOTE_IRQn GPIOTE0_IRQn
in ncs/zephyr/ext/hal/nordic/nrfx_config_nrf9160.h, on line 200.
Also, you must configure the DPPI peripheral as non-secure as done in a previous comment.
A pre-compiled hex file is included for your convenience.
Best regards,
Didrik
thank you, now I am trying to make it working on the latest ncs git... but getting errors...
is there anything I have to change?
***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb *****
starting application...
starting init gpiote...
prepare time 1 cfg...
uninit time 1...
init time 1...
prepare time 2 cfg...
uninit time 2...
init time 2...
nrfx_timer_ms_to_ticks...
nrfx_timer_extended_compare...
gpiote_setup...
gpiote_setup...
gpiote_evt_addr: 0x5000d100
NRF_GPIOTE_EVENTS_IN_0: 0x00000100
NRF_GPIOTE1_NS: 0x40031000
gpiote_evt_addr - NRF_GPIOTE0_S: 0x0ffdc100
[00:00:00.069,274] <err> os: ***** BUS FAULT *****
[00:00:00.069,274] <err> os: Precise data bus error
[00:00:00.069,274] <err> os: BFAR Address: 0x40010088
[00:00:00.069,305] <err> os: r0/a1: 0x00000000 r1/a2: 0x00000001 r2/a3: 0x80000000
[00:00:00.069,305] <err> os: r3/a4: 0x40010088 r12/ip: 0x00000030 r14/lr: 0x0000061f
[00:00:00.069,305] <err> os: xpsr: 0x29000000
[00:00:00.069,305] <err> os: Faulting instruction address (r15/pc): 0x00000632
[00:00:00.069,335] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception
[00:00:00.069,335] <err> os: Current thread: 0x20000274 (unknown)
[00:00:00.140,075] <err> os: Halting system
Hi.
A pull request for a sample demonstrating how to use the nrfx drivers in Zephyr was just opened.
Hopefully, it is able to help you.
https://github.com/zephyrproject-rtos/zephyr/pull/20089/files
Best regards,
Didrik