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Diffstat (limited to 'drivers_nrf/hal/nrf_pdm.h')
| -rw-r--r-- | drivers_nrf/hal/nrf_pdm.h | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/drivers_nrf/hal/nrf_pdm.h b/drivers_nrf/hal/nrf_pdm.h new file mode 100644 index 0000000..7937d75 --- /dev/null +++ b/drivers_nrf/hal/nrf_pdm.h @@ -0,0 +1,396 @@ +/** + * 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. + * + */ +#ifndef NRF_PDM_H_ +#define NRF_PDM_H_ + +/** + * @defgroup nrf_pdm_hal PDM HAL + * @{ + * @ingroup nrf_pdm + * + * @brief @tagAPI52 Hardware abstraction layer for accessing the pulse density modulation (PDM) peripheral. + */ + +#include <stdbool.h> +#include <stddef.h> +#include "nrf.h" +#include "nrf_assert.h" + +#ifdef __cplusplus +extern "C" { +#endif + + +#define NRF_PDM_GAIN_MINIMUM 0x00 +#define NRF_PDM_GAIN_DEFAULT 0x28 +#define NRF_PDM_GAIN_MAXIMUM 0x50 + +typedef uint8_t nrf_pdm_gain_t; + + +/** + * @brief PDM tasks. + */ +typedef enum /*lint -save -e30 -esym(628,__INTADDR__) */ +{ + NRF_PDM_TASK_START = offsetof(NRF_PDM_Type, TASKS_START), ///< Starts continuous PDM transfer. + NRF_PDM_TASK_STOP = offsetof(NRF_PDM_Type, TASKS_STOP) ///< Stops PDM transfer. +} nrf_pdm_task_t; + + +/** + * @brief PDM events. + */ +typedef enum /*lint -save -e30 -esym(628,__INTADDR__) */ +{ + NRF_PDM_EVENT_STARTED = offsetof(NRF_PDM_Type, EVENTS_STARTED), ///< PDM transfer has started. + NRF_PDM_EVENT_STOPPED = offsetof(NRF_PDM_Type, EVENTS_STOPPED), ///< PDM transfer has finished. + NRF_PDM_EVENT_END = offsetof(NRF_PDM_Type, EVENTS_END) ///< The PDM has written the last sample specified by SAMPLE.MAXCNT (or the last sample after a STOP task has been received) to Data RAM. +} nrf_pdm_event_t; + + +/** + * @brief PDM interrupt masks. + */ +typedef enum +{ + NRF_PDM_INT_STARTED = PDM_INTENSET_STARTED_Msk, ///< Interrupt on EVENTS_STARTED event. + NRF_PDM_INT_STOPPED = PDM_INTENSET_STOPPED_Msk, ///< Interrupt on EVENTS_STOPPED event. + NRF_PDM_INT_END = PDM_INTENSET_END_Msk ///< Interrupt on EVENTS_END event. +} nrf_pdm_int_mask_t; + +/** + * @brief PDM clock frequency. + */ +typedef enum +{ + NRF_PDM_FREQ_1000K = PDM_PDMCLKCTRL_FREQ_1000K, ///< PDM_CLK = 1.000 MHz. + NRF_PDM_FREQ_1032K = PDM_PDMCLKCTRL_FREQ_Default, ///< PDM_CLK = 1.032 MHz. + NRF_PDM_FREQ_1067K = PDM_PDMCLKCTRL_FREQ_1067K ///< PDM_CLK = 1.067 MHz. +} nrf_pdm_freq_t; + + +/** + * @brief PDM operation mode. + */ +typedef enum +{ + NRF_PDM_MODE_STEREO = PDM_MODE_OPERATION_Stereo, ///< Sample and store one pair (Left + Right) of 16-bit samples per RAM word. + NRF_PDM_MODE_MONO = PDM_MODE_OPERATION_Mono ///< Sample and store two successive Left samples (16 bit each) per RAM word. +} nrf_pdm_mode_t; + + +/** + * @brief PDM sampling mode. + */ +typedef enum +{ + NRF_PDM_EDGE_LEFTFALLING = PDM_MODE_EDGE_LeftFalling, ///< Left (or mono) is sampled on falling edge of PDM_CLK. + NRF_PDM_EDGE_LEFTRISING = PDM_MODE_EDGE_LeftRising ///< Left (or mono) is sampled on rising edge of PDM_CLK. +} nrf_pdm_edge_t; + + +/** + * @brief Function for triggering a PDM task. + * + * @param[in] pdm_task PDM task. + */ +__STATIC_INLINE void nrf_pdm_task_trigger(nrf_pdm_task_t pdm_task) +{ + *((volatile uint32_t *)((uint8_t *)NRF_PDM + (uint32_t)pdm_task)) = 0x1UL; +} + + +/** + * @brief Function for getting the address of a PDM task register. + * + * @param[in] pdm_task PDM task. + * + * @return Address of the specified PDM task. + */ +__STATIC_INLINE uint32_t nrf_pdm_task_address_get(nrf_pdm_task_t pdm_task) +{ + return (uint32_t)((uint8_t *)NRF_PDM + (uint32_t)pdm_task); +} + + +/** + * @brief Function for getting the state of a PDM event. + * + * @param[in] pdm_event PDM event. + * + * @return State of the specified PDM event. + */ +__STATIC_INLINE bool nrf_pdm_event_check(nrf_pdm_event_t pdm_event) +{ + return (bool)*(volatile uint32_t *)((uint8_t *)NRF_PDM + (uint32_t)pdm_event); +} + + +/** + * @brief Function for clearing a PDM event. + * + * @param[in] pdm_event PDM event. + */ +__STATIC_INLINE void nrf_pdm_event_clear(nrf_pdm_event_t pdm_event) +{ + *((volatile uint32_t *)((uint8_t *)NRF_PDM + (uint32_t)pdm_event)) = 0x0UL; +#if __CORTEX_M == 0x04 + volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)NRF_PDM + (uint32_t)pdm_event)); + (void)dummy; +#endif +} + + +/** + * @brief Function for getting the address of a PDM event register. + * + * @param[in] pdm_event PDM event. + * + * @return Address of the specified PDM event. + */ +__STATIC_INLINE volatile uint32_t * nrf_pdm_event_address_get(nrf_pdm_event_t pdm_event) +{ + return (volatile uint32_t *)((uint8_t *)NRF_PDM + (uint32_t)pdm_event); +} + + +/** + * @brief Function for enabling PDM interrupts. + * + * @param[in] pdm_int_mask Interrupts to enable. + */ +__STATIC_INLINE void nrf_pdm_int_enable(uint32_t pdm_int_mask) +{ + NRF_PDM->INTENSET = pdm_int_mask; +} + + +/** + * @brief Function for retrieving the state of PDM interrupts. + * + * @param[in] pdm_int_mask Interrupts to check. + * + * @retval true If all specified interrupts are enabled. + * @retval false If at least one of the given interrupts is not enabled. + */ +__STATIC_INLINE bool nrf_pdm_int_enable_check(uint32_t pdm_int_mask) +{ + return (bool)(NRF_PDM->INTENSET & pdm_int_mask); +} + + +/** + * @brief Function for disabling interrupts. + * + * @param pdm_int_mask Interrupts to disable. + */ +__STATIC_INLINE void nrf_pdm_int_disable(uint32_t pdm_int_mask) +{ + NRF_PDM->INTENCLR = pdm_int_mask; +} + + +/** + * @brief Function for enabling the PDM peripheral. + * + * The PDM peripheral must be enabled before use. + */ +__STATIC_INLINE void nrf_pdm_enable(void) +{ + NRF_PDM->ENABLE = (PDM_ENABLE_ENABLE_Enabled << PDM_ENABLE_ENABLE_Pos); +} + + +/** + * @brief Function for disabling the PDM peripheral. + */ +__STATIC_INLINE void nrf_pdm_disable(void) +{ + NRF_PDM->ENABLE = (PDM_ENABLE_ENABLE_Disabled << PDM_ENABLE_ENABLE_Pos); +} + + +/** + * @brief Function for checking if the PDM peripheral is enabled. + * + * @retval true If the PDM peripheral is enabled. + * @retval false If the PDM peripheral is not enabled. + */ +__STATIC_INLINE bool nrf_pdm_enable_check(void) +{ + return (NRF_PDM->ENABLE == (PDM_ENABLE_ENABLE_Enabled << PDM_ENABLE_ENABLE_Pos)); +} + + +/** + * @brief Function for setting the PDM operation mode. + * + * @param[in] pdm_mode PDM operation mode. + * @param[in] pdm_edge PDM sampling mode. + */ +__STATIC_INLINE void nrf_pdm_mode_set(nrf_pdm_mode_t pdm_mode, nrf_pdm_edge_t pdm_edge) +{ + NRF_PDM->MODE = ((pdm_mode << PDM_MODE_OPERATION_Pos) & PDM_MODE_OPERATION_Msk) + | ((pdm_edge << PDM_MODE_EDGE_Pos) & PDM_MODE_EDGE_Msk); +} + + +/** + * @brief Function for getting the PDM operation mode. + * + * @param[out] p_pdm_mode PDM operation mode. + * @param[out] p_pdm_edge PDM sampling mode. + */ +__STATIC_INLINE void nrf_pdm_mode_get(nrf_pdm_mode_t * p_pdm_mode, nrf_pdm_edge_t * p_pdm_edge) +{ + uint32_t mode = NRF_PDM->MODE; + *p_pdm_mode = (nrf_pdm_mode_t)((mode & PDM_MODE_OPERATION_Msk ) >> PDM_MODE_OPERATION_Pos); + *p_pdm_edge = (nrf_pdm_edge_t)((mode & PDM_MODE_EDGE_Msk ) >> PDM_MODE_EDGE_Pos); +} + + +/** + * @brief Function for setting the PDM clock frequency. + * + * @param[in] pdm_freq PDM clock frequency. + */ +__STATIC_INLINE void nrf_pdm_clock_set(nrf_pdm_freq_t pdm_freq) +{ + NRF_PDM->PDMCLKCTRL = ((pdm_freq << PDM_PDMCLKCTRL_FREQ_Pos) & PDM_PDMCLKCTRL_FREQ_Msk); +} + + +/** + * @brief Function for getting the PDM clock frequency. + */ +__STATIC_INLINE nrf_pdm_freq_t nrf_pdm_clock_get(void) +{ + return (nrf_pdm_freq_t) ((NRF_PDM->PDMCLKCTRL << PDM_PDMCLKCTRL_FREQ_Pos) & PDM_PDMCLKCTRL_FREQ_Msk); +} + + +/** + * @brief Function for setting up the PDM pins. + * + * @param[in] psel_clk CLK pin number. + * @param[in] psel_din DIN pin number. + */ +__STATIC_INLINE void nrf_pdm_psel_connect(uint32_t psel_clk, uint32_t psel_din) +{ + NRF_PDM->PSEL.CLK = psel_clk; + NRF_PDM->PSEL.DIN = psel_din; +} + +/** + * @brief Function for disconnecting the PDM pins. + */ +__STATIC_INLINE void nrf_pdm_psel_disconnect() +{ + NRF_PDM->PSEL.CLK = ((PDM_PSEL_CLK_CONNECT_Disconnected << PDM_PSEL_CLK_CONNECT_Pos) + & PDM_PSEL_CLK_CONNECT_Msk); + NRF_PDM->PSEL.DIN = ((PDM_PSEL_DIN_CONNECT_Disconnected << PDM_PSEL_DIN_CONNECT_Pos) + & PDM_PSEL_DIN_CONNECT_Msk); +} + + +/** + * @brief Function for setting the PDM gain. + * + * @param[in] gain_l Left channel gain. + * @param[in] gain_r Right channel gain. + */ +__STATIC_INLINE void nrf_pdm_gain_set(nrf_pdm_gain_t gain_l, nrf_pdm_gain_t gain_r) +{ + NRF_PDM->GAINL = gain_l; + NRF_PDM->GAINR = gain_r; +} + + +/** + * @brief Function for getting the PDM gain. + * + * @param[out] p_gain_l Left channel gain. + * @param[out] p_gain_r Right channel gain. + */ +__STATIC_INLINE void nrf_pdm_gain_get(nrf_pdm_gain_t * p_gain_l, nrf_pdm_gain_t * p_gain_r) +{ + *p_gain_l = NRF_PDM->GAINL; + *p_gain_r = NRF_PDM->GAINR; +} + + +/** + * @brief Function for setting the PDM sample buffer. + * + * @param[in] p_buffer Pointer to the RAM address where samples should be written with EasyDMA. + * @param[in] num Number of samples to allocate memory for in EasyDMA mode. + * + * The amount of allocated RAM depends on the operation mode. + * - For stereo mode: N 32-bit words. + * - For mono mode: Ceil(N/2) 32-bit words. + */ +__STATIC_INLINE void nrf_pdm_buffer_set(uint32_t * p_buffer, uint32_t num) +{ + NRF_PDM->SAMPLE.PTR = (uint32_t)p_buffer; + NRF_PDM->SAMPLE.MAXCNT = num; +} + +/** + * @brief Function for getting the current PDM sample buffer address. + * + * @return Pointer to the current sample buffer. + */ +__STATIC_INLINE uint32_t * nrf_pdm_buffer_get() +{ + return (uint32_t *)NRF_PDM->SAMPLE.PTR; +} + + +/** + *@} + **/ + + +#ifdef __cplusplus +} +#endif + +#endif /* NRF_PDM_H_ */ |