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/**
* Copyright (c) 2015 - 2017, 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(PDM)
#include "nrf_drv_pdm.h"
#include "nrf_assert.h"
#include "nrf_drv_common.h"
#include "nrf_gpio.h"
#define NRF_LOG_MODULE_NAME "PDM"
#if PDM_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL PDM_CONFIG_LOG_LEVEL
#define NRF_LOG_INFO_COLOR PDM_CONFIG_INFO_COLOR
#define NRF_LOG_DEBUG_COLOR PDM_CONFIG_DEBUG_COLOR
#define EVT_TO_STR(event) (event == NRF_PDM_EVENT_STARTED ? "NRF_PDM_EVENT_STARTED" : \
(event == NRF_PDM_EVENT_STOPPED ? "NRF_COMP_EVENT_DOWN" : \
(event == NRF_PDM_EVENT_END ? "NRF_COMP_EVENT_CROSS" : "UNKNOWN EVENT")))
#else //PDM_CONFIG_LOG_ENABLED
#define EVT_TO_STR(event) ""
#define NRF_LOG_LEVEL 0
#endif //PDM_CONFIG_LOG_ENABLED
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
/** @brief PDM interface status. */
typedef enum
{
NRF_PDM_STATE_IDLE,
NRF_PDM_STATE_RUNNING,
NRF_PDM_STATE_TRANSITION
} nrf_drv_pdm_state_t;
/** @brief PDM interface control block.*/
typedef struct
{
nrf_drv_state_t drv_state; ///< Driver state.
nrf_drv_pdm_state_t status; ///< Sampling state.
nrf_drv_pdm_event_handler_t event_handler; ///< Event handler function pointer.
uint16_t buffer_length; ///< Length of a single buffer in 16-bit words.
uint32_t * buffers[2]; ///< Sample buffers.
} nrf_drv_pdm_cb_t;
static nrf_drv_pdm_cb_t m_cb;
void PDM_IRQHandler(void)
{
if (nrf_pdm_event_check(NRF_PDM_EVENT_END))
{
nrf_pdm_event_clear(NRF_PDM_EVENT_END);
NRF_LOG_DEBUG("Event: %s.\r\n", (uint32_t)EVT_TO_STR(NRF_PDM_EVENT_END));
//Buffer is ready to process.
if (nrf_pdm_buffer_get() == m_cb.buffers[0])
{
NRF_LOG_DEBUG("PDM data:\r\n");
NRF_LOG_HEXDUMP_DEBUG((uint8_t *)m_cb.buffers[1], m_cb.buffer_length * sizeof(m_cb.buffers[1]));
m_cb.event_handler(m_cb.buffers[1], m_cb.buffer_length);
}
else
{
NRF_LOG_DEBUG("PDM data:\r\n");
NRF_LOG_HEXDUMP_DEBUG((uint8_t *)m_cb.buffers[0], m_cb.buffer_length * sizeof(m_cb.buffers[0]));
m_cb.event_handler(m_cb.buffers[0], m_cb.buffer_length);
}
}
else if (nrf_pdm_event_check(NRF_PDM_EVENT_STARTED))
{
nrf_pdm_event_clear(NRF_PDM_EVENT_STARTED);
NRF_LOG_DEBUG("Event: %s.\r\n", (uint32_t)EVT_TO_STR(NRF_PDM_EVENT_STARTED));
m_cb.status = NRF_PDM_STATE_RUNNING;
//Swap buffer.
if (nrf_pdm_buffer_get() == m_cb.buffers[0])
{
nrf_pdm_buffer_set(m_cb.buffers[1],m_cb.buffer_length);
}
else
{
nrf_pdm_buffer_set(m_cb.buffers[0],m_cb.buffer_length);
}
}
else if (nrf_pdm_event_check(NRF_PDM_EVENT_STOPPED))
{
nrf_pdm_event_clear(NRF_PDM_EVENT_STOPPED);
NRF_LOG_DEBUG("Event: %s.\r\n", (uint32_t)EVT_TO_STR(NRF_PDM_EVENT_STOPPED));
nrf_pdm_disable();
m_cb.status = NRF_PDM_STATE_IDLE;
}
}
ret_code_t nrf_drv_pdm_init(nrf_drv_pdm_config_t const * p_config,
nrf_drv_pdm_event_handler_t event_handler)
{
ret_code_t err_code;
if (m_cb.drv_state != NRF_DRV_STATE_UNINITIALIZED)
{
err_code = NRF_ERROR_INVALID_STATE;
NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
if ((p_config == NULL)
|| (event_handler == NULL))
{
err_code = NRF_ERROR_INVALID_PARAM;
NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
if (p_config->gain_l > NRF_PDM_GAIN_MAXIMUM
|| p_config->gain_r > NRF_PDM_GAIN_MAXIMUM
|| p_config->buffer_length > NRF_PDM_MAX_BUFFER_SIZE)
{
err_code = NRF_ERROR_INVALID_PARAM;
NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
m_cb.buffers[0] = (uint32_t*)p_config->buffer_a;
m_cb.buffers[1] = (uint32_t*)p_config->buffer_b;
m_cb.buffer_length = p_config->buffer_length;
m_cb.event_handler = event_handler;
m_cb.status = NRF_PDM_STATE_IDLE;
nrf_pdm_buffer_set(m_cb.buffers[0],m_cb.buffer_length);
nrf_pdm_clock_set(p_config->clock_freq);
nrf_pdm_mode_set(p_config->mode, p_config->edge);
nrf_pdm_gain_set(p_config->gain_l, p_config->gain_r);
nrf_gpio_cfg_output(p_config->pin_clk);
nrf_gpio_pin_clear(p_config->pin_clk);
nrf_gpio_cfg_input(p_config->pin_din, NRF_GPIO_PIN_PULLDOWN);
nrf_pdm_psel_connect(p_config->pin_clk, p_config->pin_din);
m_cb.drv_state = NRF_DRV_STATE_INITIALIZED;
nrf_pdm_int_enable(NRF_PDM_INT_STARTED | NRF_PDM_INT_END | NRF_PDM_INT_STOPPED);
nrf_drv_common_irq_enable(PDM_IRQn, p_config->interrupt_priority);
err_code = NRF_SUCCESS;
NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
void nrf_drv_pdm_uninit(void)
{
nrf_pdm_disable();
nrf_pdm_psel_disconnect();
m_cb.drv_state = NRF_DRV_STATE_UNINITIALIZED;
NRF_LOG_INFO("Uninitialized.\r\n");
}
ret_code_t nrf_drv_pdm_start(void)
{
ASSERT(m_cb.drv_state != NRF_DRV_STATE_UNINITIALIZED);
ret_code_t err_code;
if (m_cb.status != NRF_PDM_STATE_IDLE)
{
if (m_cb.status == NRF_PDM_STATE_RUNNING)
{
err_code = NRF_SUCCESS;
NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
err_code = NRF_ERROR_BUSY;
NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
m_cb.status = NRF_PDM_STATE_TRANSITION;
m_cb.drv_state = NRF_DRV_STATE_POWERED_ON;
nrf_pdm_enable();
nrf_pdm_event_clear(NRF_PDM_EVENT_STARTED);
nrf_pdm_task_trigger(NRF_PDM_TASK_START);
err_code = NRF_SUCCESS;
NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
ret_code_t nrf_drv_pdm_stop(void)
{
ASSERT(m_cb.drv_state != NRF_DRV_STATE_UNINITIALIZED);
ret_code_t err_code;
if (m_cb.status != NRF_PDM_STATE_RUNNING)
{
if (m_cb.status == NRF_PDM_STATE_IDLE)
{
nrf_pdm_disable();
err_code = NRF_SUCCESS;
NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
err_code = NRF_ERROR_BUSY;
NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
m_cb.status = NRF_PDM_STATE_TRANSITION;
m_cb.drv_state = NRF_DRV_STATE_INITIALIZED;
nrf_pdm_task_trigger(NRF_PDM_TASK_STOP);
err_code = NRF_SUCCESS;
NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
#endif //NRF_MODULE_ENABLED(PDM)
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