Hi all ,
I have to decode the IR pulse for remote . I want to use Timer to count pulse width .I know how to use timer to create a time , but I don't know how to use timer to count. Please show me a solution . Thank
Hi all ,
I have to decode the IR pulse for remote . I want to use Timer to count pulse width .I know how to use timer to create a time , but I don't know how to use timer to count. Please show me a solution . Thank
Hi,
You can use app_timer_cnt_get(); for getting count value .
#include <stdbool.h> #include <stdint.h> #include "nrf.h" #include "nrf_drv_timer.h" #include "bsp.h" #include "app_error.h" uint32_t counter; const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0); /** * @brief Handler for timer events. */ void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context) { static uint32_t i; uint32_t led_to_invert = ((i++) % LEDS_NUMBER); switch (event_type) { case NRF_TIMER_EVENT_COMPARE0: nrf_gpio_pin_toggle(LED_1); NRF_TIMER2->TASKS_CAPTURE[0] = 1; counter = NRF_TIMER2->CC[0]; break; default: //Do nothing. break; } } /** * @brief Function for main application entry. */ int main(void) { uint32_t time_ms = 1000; //Time(in miliseconds) between consecutive compare events. uint32_t time_ticks; uint32_t err_code = NRF_SUCCESS; //Configure all leds on board. bsp_board_leds_init(); //Configure TIMER_LED for generating simple light effect - leds on board will invert his state one after the other. nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG; timer_cfg.frequency = NRF_TIMER_FREQ_1MHz; err_code = nrf_drv_timer_init(&TIMER_LED, &timer_cfg, timer_led_event_handler); APP_ERROR_CHECK(err_code); //32 bit , 1M nrf_drv_timer_extended_compare( &TIMER_LED, NRF_TIMER_CC_CHANNEL0, 1000000, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true); nrf_drv_timer_enable(&TIMER_LED); while (1) { } } /** @} */
It my code , but I don't get counter , it alway = 0. Can you explain for me?
#include <stdbool.h> #include <stdint.h> #include "nrf.h" #include "nrf_drv_timer.h" #include "bsp.h" #include "app_error.h" uint32_t counter; const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0); /** * @brief Handler for timer events. */ void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context) { static uint32_t i; uint32_t led_to_invert = ((i++) % LEDS_NUMBER); switch (event_type) { case NRF_TIMER_EVENT_COMPARE0: nrf_gpio_pin_toggle(LED_1); NRF_TIMER2->TASKS_CAPTURE[0] = 1; counter = NRF_TIMER2->CC[0]; break; default: //Do nothing. break; } } /** * @brief Function for main application entry. */ int main(void) { uint32_t time_ms = 1000; //Time(in miliseconds) between consecutive compare events. uint32_t time_ticks; uint32_t err_code = NRF_SUCCESS; //Configure all leds on board. bsp_board_leds_init(); //Configure TIMER_LED for generating simple light effect - leds on board will invert his state one after the other. nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG; timer_cfg.frequency = NRF_TIMER_FREQ_1MHz; err_code = nrf_drv_timer_init(&TIMER_LED, &timer_cfg, timer_led_event_handler); APP_ERROR_CHECK(err_code); //32 bit , 1M nrf_drv_timer_extended_compare( &TIMER_LED, NRF_TIMER_CC_CHANNEL0, 1000000, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true); nrf_drv_timer_enable(&TIMER_LED); while (1) { } } /** @} */
It my code , but I don't get counter , it alway = 0. Can you explain for me?
you can use application timer. here is the tutorial link. Hope this helps.
https://devzone.nordicsemi.com/tutorials/b/software-development-kit/posts/application-timer-tutorial
then use app_timer_cnt_get function