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- /**
- * Copyright (c) 2015 - 2020, Nordic Semiconductor ASA
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form, except as embedded into a Nordic
- * Semiconductor ASA integrated circuit in a product or a software update for
- * such product, must reproduce the above copyright notice, this list of
- * conditions and the following disclaimer in the documentation and/or other
- * materials provided with the distribution.
- *
- * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * 4. This software, with or without modification, must only be used with a
- * Nordic Semiconductor ASA integrated circuit.
- *
- * 5. Any software provided in binary form under this license must not be reverse
- * engineered, decompiled, modified and/or disassembled.
- *
- * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include "sdk_common.h"
- #if NRF_MODULE_ENABLED(LOW_POWER_PWM)
- #include <string.h>
- #include "low_power_pwm.h"
- #include "nrf_gpio.h"
- #include "app_timer.h"
- #include "nrf_assert.h"
- /**
- * @brief Function for turning on pins.
- *
- * Sets the pin high state according to active_high parameter.
- *
- * @param[in] p_pwm_instance Pointer to instance of low-power PWM.
- */
- __STATIC_INLINE void pin_on(low_power_pwm_t * p_pwm_instance)
- {
- if (p_pwm_instance->active_high)
- {
- nrf_gpio_port_out_set(p_pwm_instance->p_port, p_pwm_instance->bit_mask_toggle);
- }
- else
- {
- nrf_gpio_port_out_clear(p_pwm_instance->p_port, p_pwm_instance->bit_mask_toggle);
- }
- p_pwm_instance->pin_is_on = true;
- }
- /**
- * @brief Function for turning off pins.
- *
- * Sets the pin low state according to active_high parameter.
- *
- * @param[in] p_pwm_instance Pointer to instance of low-power PWM.
- */
- __STATIC_INLINE void pin_off(low_power_pwm_t * p_pwm_instance)
- {
- if (p_pwm_instance->active_high)
- {
- nrf_gpio_port_out_clear(p_pwm_instance->p_port, p_pwm_instance->bit_mask_toggle);
- }
- else
- {
- nrf_gpio_port_out_set(p_pwm_instance->p_port, p_pwm_instance->bit_mask_toggle);
- }
- p_pwm_instance->pin_is_on = false;
- }
- /**
- * @brief Timer event handler for PWM.
- *
- * @param[in] p_context General purpose pointer. Will be passed to the time-out handler
- * when the timer expires.
- *
- */
- static void pwm_timeout_handler(void * p_context)
- {
- ret_code_t err_code;
- uint8_t duty_cycle;
- low_power_pwm_t * p_pwm_instance = (low_power_pwm_t *)p_context;
- if (p_pwm_instance->evt_type == LOW_POWER_PWM_EVENT_PERIOD)
- {
- if (p_pwm_instance->handler)
- {
- p_pwm_instance->handler(p_pwm_instance);
- if (p_pwm_instance->pwm_state != NRFX_DRV_STATE_POWERED_ON)
- {
- return;
- }
- }
- duty_cycle = p_pwm_instance->duty_cycle;
- if (duty_cycle == p_pwm_instance->period) // Process duty cycle 100%
- {
- pin_on(p_pwm_instance);
- p_pwm_instance->timeout_ticks = p_pwm_instance->period + APP_TIMER_MIN_TIMEOUT_TICKS;
- }
- else if (duty_cycle == 0) // Process duty cycle 0%
- {
- pin_off(p_pwm_instance);
- p_pwm_instance->timeout_ticks = p_pwm_instance->period + APP_TIMER_MIN_TIMEOUT_TICKS;
- }
- else // Process any other duty cycle than 0 or 100%
- {
- pin_on(p_pwm_instance);
- p_pwm_instance->timeout_ticks = ((duty_cycle * p_pwm_instance->period)>>8) +
- APP_TIMER_MIN_TIMEOUT_TICKS;
- // setting next state
- p_pwm_instance->evt_type = LOW_POWER_PWM_EVENT_DUTY_CYCLE;
- }
- }
- else
- {
- pin_off(p_pwm_instance);
- p_pwm_instance->evt_type = LOW_POWER_PWM_EVENT_PERIOD;
- p_pwm_instance->timeout_ticks = (((p_pwm_instance->period - p_pwm_instance->duty_cycle) *
- p_pwm_instance->period)>>8) + APP_TIMER_MIN_TIMEOUT_TICKS;
- }
- if (p_pwm_instance->pwm_state == NRFX_DRV_STATE_POWERED_ON)
- {
- err_code = app_timer_start(*p_pwm_instance->p_timer_id, p_pwm_instance->timeout_ticks, p_pwm_instance);
- APP_ERROR_CHECK(err_code);
- }
- }
- ret_code_t low_power_pwm_init(low_power_pwm_t * p_pwm_instance,
- low_power_pwm_config_t const * p_pwm_config,
- app_timer_timeout_handler_t handler)
- {
- ASSERT(p_pwm_instance->pwm_state == NRFX_DRV_STATE_UNINITIALIZED);
- ASSERT(p_pwm_config->bit_mask != 0);
- ASSERT(p_pwm_config->p_port != NULL);
- ASSERT(p_pwm_config->period != 0);
- ret_code_t err_code;
- uint32_t bit_mask;
- uint32_t pin_number = 0;
- p_pwm_instance->handler = handler;
- bit_mask = p_pwm_config->bit_mask;
- p_pwm_instance->active_high = p_pwm_config->active_high;
- p_pwm_instance->bit_mask = p_pwm_config->bit_mask;
- p_pwm_instance->bit_mask_toggle = p_pwm_config->bit_mask;
- p_pwm_instance->p_port = p_pwm_config->p_port;
- p_pwm_instance->period = p_pwm_config->period;
- p_pwm_instance->p_timer_id = p_pwm_config->p_timer_id;
- err_code = app_timer_create(p_pwm_instance->p_timer_id, APP_TIMER_MODE_SINGLE_SHOT, pwm_timeout_handler);
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
- while (bit_mask)
- {
- if (bit_mask & 0x1UL)
- {
- nrf_gpio_cfg_output(pin_number);
- }
- pin_number++;
- bit_mask >>= 1UL;
- }
- pin_off(p_pwm_instance);
- p_pwm_instance->pwm_state = NRFX_DRV_STATE_INITIALIZED;
- return NRF_SUCCESS;
- }
- ret_code_t low_power_pwm_start(low_power_pwm_t * p_pwm_instance,
- uint32_t pin_bit_mask)
- {
- ASSERT(p_pwm_instance->pwm_state != NRFX_DRV_STATE_UNINITIALIZED);
- ASSERT(((p_pwm_instance->bit_mask) & pin_bit_mask) != 0x00);
- p_pwm_instance->pwm_state = NRFX_DRV_STATE_POWERED_ON;
- p_pwm_instance->bit_mask_toggle = pin_bit_mask;
- pin_off(p_pwm_instance);
- p_pwm_instance->bit_mask |= pin_bit_mask;
- p_pwm_instance->evt_type = LOW_POWER_PWM_EVENT_PERIOD;
- app_timer_timeout_handler_t handler = p_pwm_instance->handler;
- p_pwm_instance->handler = NULL;
- pwm_timeout_handler(p_pwm_instance);
- p_pwm_instance->handler = handler;
- return NRF_SUCCESS;
- }
- ret_code_t low_power_pwm_stop(low_power_pwm_t * p_pwm_instance)
- {
- ASSERT(p_pwm_instance->pwm_state == NRFX_DRV_STATE_POWERED_ON);
- ret_code_t err_code;
- err_code = app_timer_stop(*p_pwm_instance->p_timer_id);
- pin_off(p_pwm_instance);
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
- p_pwm_instance->pwm_state = NRFX_DRV_STATE_INITIALIZED;
- return NRF_SUCCESS;
- }
- ret_code_t low_power_pwm_duty_set(low_power_pwm_t * p_pwm_instance, uint8_t duty_cycle)
- {
- if ( p_pwm_instance->period < duty_cycle)
- {
- return NRF_ERROR_INVALID_PARAM;
- }
- p_pwm_instance->duty_cycle = duty_cycle;
- return NRF_SUCCESS;
- }
- #endif //NRF_MODULE_ENABLED(LOW_POWER_PWM)
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