moved spi to LLD

3 files changed, 2 insertions, 614 deletions

diff --git a/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c b/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c
deleted file mode 100644
index 83b231f..0000000
--- a/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c
+++ /dev/null
@@ -1,374 +0,0 @@
-/*

-    Copyright (C) 2015 Stephen Caudle

-

-    Licensed under the Apache License, Version 2.0 (the "License");

-    you may not use this file except in compliance with the License.

-    You may obtain a copy of the License at

-

-        http://www.apache.org/licenses/LICENSE-2.0

-

-    Unless required by applicable law or agreed to in writing, software

-    distributed under the License is distributed on an "AS IS" BASIS,

-    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

-    See the License for the specific language governing permissions and

-    limitations under the License.

-*/

-

-/**

- * @file    NRF51822/spi_lld.c

- * @brief   NRF51822 low level SPI driver code.

- *

- * @addtogroup SPI

- * @{

- */

-

-#include "hal.h"

-

-#if HAL_USE_SPI || defined(__DOXYGEN__)

-

-/*===========================================================================*/

-/* Driver exported variables.                                                */

-/*===========================================================================*/

-

-#if NRF5_SPI_USE_SPI0 || defined(__DOXYGEN__)

-/** @brief SPI1 driver identifier.*/

-SPIDriver SPID1;

-#endif

-

-#if NRF5_SPI_USE_SPI1 || defined(__DOXYGEN__)

-/** @brief SPI2 driver identifier.*/

-SPIDriver SPID2;

-#endif

-

-/*===========================================================================*/

-/* Driver local variables and types.                                         */

-/*===========================================================================*/

-

-/*===========================================================================*/

-/* Driver local functions.                                                   */

-/*===========================================================================*/

-

-/**

- * @brief   Preloads the transmit FIFO.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- */

-static void port_fifo_preload(SPIDriver *spip) {

-  NRF_SPI_Type *port = spip->port;

-

-  if (spip->txcnt > 0 && spip->txptr != NULL)

-    port->TXD = *(uint8_t *)spip->txptr++;

-  else

-    port->TXD = 0xFF;

-  spip->txcnt--;

-}

-

-#if defined(__GNUC__)

-__attribute__((noinline))

-#endif

-/**

- * @brief   Common IRQ handler.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- */

-static void serve_interrupt(SPIDriver *spip) {

-  NRF_SPI_Type *port = spip->port;

-

-  // Clear SPI READY event flag

-  port->EVENTS_READY = 0;

-

-  if (spip->rxptr != NULL) {

-    *(uint8_t *)spip->rxptr++ = port->RXD;

-  }

-  else {

-    (void)port->RXD;

-    if (--spip->rxcnt == 0) {

-      osalDbgAssert(spip->txcnt == 0, "counter out of synch");

-      /* Stops the IRQ sources.*/

-      spip->port->INTENCLR = (SPI_INTENCLR_READY_Clear << SPI_INTENCLR_READY_Pos);

-      /* Portable SPI ISR code defined in the high level driver, note, it is

-         a macro.*/

-      _spi_isr_code(spip);

-      return;

-    }

-  }

-  if (spip->txcnt > 0) {

-    port_fifo_preload(spip);

-  }

-  else {

-    spip->port->INTENCLR = (SPI_INTENCLR_READY_Clear << SPI_INTENCLR_READY_Pos);

-    /* Portable SPI ISR code defined in the high level driver, note, it is

-       a macro.*/

-    _spi_isr_code(spip);

-  }

-}

-

-/*===========================================================================*/

-/* Driver interrupt handlers.                                                */

-/*===========================================================================*/

-

-#if NRF5_SPI_USE_SPI0 || defined(__DOXYGEN__)

-/**

- * @brief   SPI0 interrupt handler.

- *

- * @isr

- */

-CH_IRQ_HANDLER(Vector4C) {

-

-  CH_IRQ_PROLOGUE();

-  serve_interrupt(&SPID1);

-  CH_IRQ_EPILOGUE();

-}

-#endif

-#if NRF5_SPI_USE_SPI1 || defined(__DOXYGEN__)

-/**

- * @brief   SPI1 interrupt handler.

- *

- * @isr

- */

-CH_IRQ_HANDLER(Vector50) {

-

-  CH_IRQ_PROLOGUE();

-  serve_interrupt(&SPID2);

-  CH_IRQ_EPILOGUE();

-}

-#endif

-

-/*===========================================================================*/

-/* Driver exported functions.                                                */

-/*===========================================================================*/

-

-/**

- * @brief   Low level SPI driver initialization.

- *

- * @notapi

- */

-void spi_lld_init(void) {

-

-#if NRF5_SPI_USE_SPI0

-  spiObjectInit(&SPID1);

-  SPID1.port = NRF_SPI0;

-#endif

-#if NRF5_SPI_USE_SPI1

-  spiObjectInit(&SPID2);

-  SPID2.port = NRF_SPI1;

-#endif

-}

-

-/**

- * @brief   Configures and activates the SPI peripheral.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- *

- * @notapi

- */

-void spi_lld_start(SPIDriver *spip) {

-  uint32_t config;

-

-  if (spip->state == SPI_STOP) {

-#if NRF5_SPI_USE_SPI0

-    if (&SPID1 == spip)

-      nvicEnableVector(SPI0_TWI0_IRQn, NRF5_SPI_SPI0_IRQ_PRIORITY);

-#endif

-#if NRF5_SPI_USE_SPI1

-    if (&SPID2 == spip)

-      nvicEnableVector(SPI1_TWI1_IRQn, NRF5_SPI_SPI1_IRQ_PRIORITY);

-#endif

-  }

-

-  config = spip->config->lsbfirst ?

-    (SPI_CONFIG_ORDER_LsbFirst << SPI_CONFIG_ORDER_Pos) :

-    (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos);

-

-  switch (spip->config->mode) {

-    case 1:

-      config |= (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);

-      config |= (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos);

-      break;

-    case 2:

-      config |= (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);

-      config |= (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos);

-      break;

-    case 3:

-      config |= (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);

-      config |= (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos);

-      break;

-    default:

-      config |= (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);

-      config |= (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos);

-      break;

-  }

-

-  /* Configuration.*/

-  spip->port->CONFIG = config;

-  spip->port->PSELSCK = spip->config->sckpad;

-  spip->port->PSELMOSI = spip->config->mosipad;

-  spip->port->PSELMISO = spip->config->misopad;

-  spip->port->FREQUENCY = spip->config->freq;

-  spip->port->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos);

-

-  /* clear events flag */

-  spip->port->EVENTS_READY = 0;

-}

-

-/**

- * @brief   Deactivates the SPI peripheral.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- *

- * @notapi

- */

-void spi_lld_stop(SPIDriver *spip) {

-

-  if (spip->state != SPI_STOP) {

-    spip->port->ENABLE  = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);

-    spip->port->INTENCLR = (SPI_INTENCLR_READY_Clear << SPI_INTENCLR_READY_Pos);

-#if NRF5_SPI_USE_SPI0

-    if (&SPID1 == spip)

-      nvicDisableVector(SPI0_TWI0_IRQn);

-#endif

-#if NRF5_SPI_USE_SPI1

-    if (&SPID2 == spip)

-      nvicDisableVector(SPI1_TWI1_IRQn);

-#endif

-  }

-}

-

-/**

- * @brief   Asserts the slave select signal and prepares for transfers.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- *

- * @notapi

- */

-void spi_lld_select(SPIDriver *spip) {

-

-  palClearPad(IOPORT1, spip->config->sspad);

-}

-

-/**

- * @brief   Deasserts the slave select signal.

- * @details The previously selected peripheral is unselected.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- *

- * @notapi

- */

-void spi_lld_unselect(SPIDriver *spip) {

-

-  palSetPad(IOPORT1, spip->config->sspad);

-}

-

-/**

- * @brief   Ignores data on the SPI bus.

- * @details This function transmits a series of idle words on the SPI bus and

- *          ignores the received data. This function can be invoked even

- *          when a slave select signal has not been yet asserted.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- * @param[in] n         number of words to be ignored

- *

- * @notapi

- */

-void spi_lld_ignore(SPIDriver *spip, size_t n) {

-

-  spip->rxptr = NULL;

-  spip->txptr = NULL;

-  spip->rxcnt = spip->txcnt = n;

-  port_fifo_preload(spip);

-  spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);

-}

-

-/**

- * @brief   Exchanges data on the SPI bus.

- * @details This asynchronous function starts a simultaneous transmit/receive

- *          operation.

- * @post    At the end of the operation the configured callback is invoked.

- * @note    The buffers are organized as uint8_t arrays for data sizes below or

- *          equal to 8 bits else it is organized as uint16_t arrays.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- * @param[in] n         number of words to be exchanged

- * @param[in] txbuf     the pointer to the transmit buffer

- * @param[out] rxbuf    the pointer to the receive buffer

- *

- * @notapi

- */

-void spi_lld_exchange(SPIDriver *spip, size_t n,

-                      const void *txbuf, void *rxbuf) {

-

-  spip->rxptr = rxbuf;

-  spip->txptr = txbuf;

-  spip->rxcnt = spip->txcnt = n;

-  port_fifo_preload(spip);

-  spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);

-}

-

-/**

- * @brief   Sends data over the SPI bus.

- * @details This asynchronous function starts a transmit operation.

- * @post    At the end of the operation the configured callback is invoked.

- * @note    The buffers are organized as uint8_t arrays for data sizes below or

- *          equal to 8 bits else it is organized as uint16_t arrays.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- * @param[in] n         number of words to send

- * @param[in] txbuf     the pointer to the transmit buffer

- *

- * @notapi

- */

-void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {

-

-  spip->rxptr = NULL;

-  spip->txptr = txbuf;

-  spip->rxcnt = spip->txcnt = n;

-  port_fifo_preload(spip);

-  spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);

-}

-

-/**

- * @brief   Receives data from the SPI bus.

- * @details This asynchronous function starts a receive operation.

- * @post    At the end of the operation the configured callback is invoked.

- * @note    The buffers are organized as uint8_t arrays for data sizes below or

- *          equal to 8 bits else it is organized as uint16_t arrays.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- * @param[in] n         number of words to receive

- * @param[out] rxbuf    the pointer to the receive buffer

- *

- * @notapi

- */

-void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {

-

-  spip->rxptr = rxbuf;

-  spip->txptr = NULL;

-  spip->rxcnt = spip->txcnt = n;

-  port_fifo_preload(spip);

-  spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);

-}

-

-/**

- * @brief   Exchanges one frame using a polled wait.

- * @details This synchronous function exchanges one frame using a polled

- *          synchronization method. This function is useful when exchanging

- *          small amount of data on high speed channels, usually in this

- *          situation is much more efficient just wait for completion using

- *          polling than suspending the thread waiting for an interrupt.

- *

- * @param[in] spip      pointer to the @p SPIDriver object

- * @param[in] frame     the data frame to send over the SPI bus

- * @return              The received data frame from the SPI bus.

- */

-uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {

-

-  spip->port->TXD = (uint8_t)frame;

-  while (spip->port->EVENTS_READY == 0)

-    ;

-  spip->port->EVENTS_READY = 0;

-  return spip->port->RXD;

-}

-

-#endif /* HAL_USE_SPI */

-

-/** @} */

diff --git a/os/hal/ports/NRF5/NRF51822/hal_spi_lld.h b/os/hal/ports/NRF5/NRF51822/hal_spi_lld.h
deleted file mode 100644
index 742a10b..0000000
--- a/os/hal/ports/NRF5/NRF51822/hal_spi_lld.h
+++ /dev/null
@@ -1,238 +0,0 @@
-/*

-    Copyright (C) 2015 Stephen Caudle

-

-    Licensed under the Apache License, Version 2.0 (the "License");

-    you may not use this file except in compliance with the License.

-    You may obtain a copy of the License at

-

-        http://www.apache.org/licenses/LICENSE-2.0

-

-    Unless required by applicable law or agreed to in writing, software

-    distributed under the License is distributed on an "AS IS" BASIS,

-    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

-    See the License for the specific language governing permissions and

-    limitations under the License.

-*/

-

-/**

- * @file    NRF51822/spi_lld.h

- * @brief   NRF51822 low level SPI driver header.

- *

- * @addtogroup SPI

- * @{

- */

-

-#ifndef HAL_SPI_LLD_H

-#define HAL_SPI_LLD_H

-

-#if HAL_USE_SPI || defined(__DOXYGEN__)

-

-/*===========================================================================*/

-/* Driver constants.                                                         */

-/*===========================================================================*/

-

-/*===========================================================================*/

-/* Driver pre-compile time settings.                                         */

-/*===========================================================================*/

-

-/**

- * @brief   SPI0 interrupt priority level setting.

- */

-#if !defined(NRF5_SPI_SPI0_IRQ_PRIORITY) || defined(__DOXYGEN__)

-#define NRF5_SPI_SPI0_IRQ_PRIORITY    3

-#endif

-

-/**

- * @brief   SPI1 interrupt priority level setting.

- */

-#if !defined(NRF5_SPI_SPI1_IRQ_PRIORITY) || defined(__DOXYGEN__)

-#define NRF5_SPI_SPI1_IRQ_PRIORITY    3

-#endif

-

-/**

- * @brief   Overflow error hook.

- * @details The default action is to stop the system.

- */

-#if !defined(NRF5_SPI_SPI_ERROR_HOOK) || defined(__DOXYGEN__)

-#define NRF5_SPI_SPI_ERROR_HOOK()    chSysHalt()

-#endif

-

-/*===========================================================================*/

-/* Derived constants and error checks.                                       */

-/*===========================================================================*/

-

-#if !NRF5_SPI_USE_SPI0 && !NRF5_SPI_USE_SPI1

-#error "SPI driver activated but no SPI peripheral assigned"

-#endif

-

-#if NRF5_SPI_USE_SPI0 &&						    \

-    !OSAL_IRQ_IS_VALID_PRIORITY(NRF5_SPI_SPI0_IRQ_PRIORITY)

-#error "Invalid IRQ priority assigned to SPI0"

-#endif

-

-#if NRF5_SPI_USE_SPI1 &&						    \

-    !OSAL_IRQ_IS_VALID_PRIORITY(NRF5_SPI_SPI1_IRQ_PRIORITY)

-#error "Invalid IRQ priority assigned to SPI1"

-#endif

-

-/*===========================================================================*/

-/* Driver data structures and types.                                         */

-/*===========================================================================*/

-

-/**

- * @brief   Type of a structure representing an SPI driver.

- */

-typedef struct SPIDriver SPIDriver;

-

-/**

- * @brief   SPI notification callback type.

- *

- * @param[in] spip      pointer to the @p SPIDriver object triggering the

- *                      callback

- */

-typedef void (*spicallback_t)(SPIDriver *spip);

-

-/**

- * @brief   SPI frequency

- */

-typedef enum {

-  NRF5_SPI_FREQ_125KBPS = (SPI_FREQUENCY_FREQUENCY_K125 << SPI_FREQUENCY_FREQUENCY_Pos),

-  NRF5_SPI_FREQ_250KBPS = (SPI_FREQUENCY_FREQUENCY_K250 << SPI_FREQUENCY_FREQUENCY_Pos),

-  NRF5_SPI_FREQ_500KBPS = (SPI_FREQUENCY_FREQUENCY_K500 << SPI_FREQUENCY_FREQUENCY_Pos),

-  NRF5_SPI_FREQ_1MBPS = (SPI_FREQUENCY_FREQUENCY_M1 << SPI_FREQUENCY_FREQUENCY_Pos),

-  NRF5_SPI_FREQ_2MBPS = (SPI_FREQUENCY_FREQUENCY_M2 << SPI_FREQUENCY_FREQUENCY_Pos),

-  NRF5_SPI_FREQ_4MBPS = (SPI_FREQUENCY_FREQUENCY_M4 << SPI_FREQUENCY_FREQUENCY_Pos),

-  NRF5_SPI_FREQ_8MBPS = (SPI_FREQUENCY_FREQUENCY_M8 << SPI_FREQUENCY_FREQUENCY_Pos),

-} spifreq_t;

-

-/**

- * @brief   Driver configuration structure.

- */

-typedef struct {

-  /**

-   * @brief Operation complete callback or @p NULL.

-   */

-  spicallback_t         end_cb;

-  /**

-   * @brief The frequency of the SPI peripheral

-   */

-  spifreq_t             freq;

-  /**

-   * @brief The SCK pad

-   */

-  uint16_t              sckpad;

-  /**

-   * @brief The MOSI pad

-   */

-  uint16_t              mosipad;

-  /**

-   * @brief The MOSI pad

-   */

-  uint16_t              misopad;

-  /* End of the mandatory fields.*/

-  /**

-   * @brief The chip select line pad number.

-   */

-  uint16_t              sspad;

-  /**

-   * @brief Shift out least significant bit first

-   */

-  uint8_t               lsbfirst;

-  /**

-   * @brief SPI mode

-   */

-  uint8_t               mode;

-} SPIConfig;

-

-/**

- * @brief   Structure representing a SPI driver.

- */

-struct SPIDriver {

-  /**

-   * @brief Driver state.

-   */

-  spistate_t            state;

-  /**

-   * @brief Current configuration data.

-   */

-  const SPIConfig       *config;

-#if SPI_USE_WAIT || defined(__DOXYGEN__)

-  /**

-   * @brief Waiting thread.

-   */

-  thread_reference_t    thread;

-#endif /* SPI_USE_WAIT */

-#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)

-#if CH_CFG_USE_MUTEXES || defined(__DOXYGEN__)

-  /**

-   * @brief Mutex protecting the bus.

-   */

-  mutex_t               mutex;

-#elif CH_CFG_USE_SEMAPHORES

-  semaphore_t           semaphore;

-#endif

-#endif /* SPI_USE_MUTUAL_EXCLUSION */

-#if defined(SPI_DRIVER_EXT_FIELDS)

-  SPI_DRIVER_EXT_FIELDS

-#endif

-  /* End of the mandatory fields.*/

-  /**

-   * @brief Pointer to the SPI port.

-   */

-  NRF_SPI_Type          *port;

-  /**

-   * @brief Number of bytes yet to be received.

-   */

-  uint32_t              rxcnt;

-  /**

-   * @brief Receive pointer or @p NULL.

-   */

-  void                  *rxptr;

-  /**

-   * @brief Number of bytes yet to be transmitted.

-   */

-  uint32_t              txcnt;

-  /**

-   * @brief Transmit pointer or @p NULL.

-   */

-  const void            *txptr;

-};

-

-/*===========================================================================*/

-/* Driver macros.                                                            */

-/*===========================================================================*/

-

-/*===========================================================================*/

-/* External declarations.                                                    */

-/*===========================================================================*/

-

-#if NRF5_SPI_USE_SPI0 && !defined(__DOXYGEN__)

-extern SPIDriver SPID1;

-#endif

-#if NRF5_SPI_USE_SPI1 && !defined(__DOXYGEN__)

-extern SPIDriver SPID2;

-#endif

-

-#ifdef __cplusplus

-extern "C" {

-#endif

-  void spi_lld_init(void);

-  void spi_lld_start(SPIDriver *spip);

-  void spi_lld_stop(SPIDriver *spip);

-  void spi_lld_select(SPIDriver *spip);

-  void spi_lld_unselect(SPIDriver *spip);

-  void spi_lld_ignore(SPIDriver *spip, size_t n);

-  void spi_lld_exchange(SPIDriver *spip, size_t n,

-                        const void *txbuf, void *rxbuf);

-  void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);

-  void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);

-  uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);

-#ifdef __cplusplus

-}

-#endif

-

-#endif /* HAL_USE_SPI */

-

-#endif /* HAL_SPI_LLD_H */

-

-/** @} */

diff --git a/os/hal/ports/NRF5/NRF51822/platform.mk b/os/hal/ports/NRF5/NRF51822/platform.mk
index a8526b7..587aebd 100644
--- a/os/hal/ports/NRF5/NRF51822/platform.mk
+++ b/os/hal/ports/NRF5/NRF51822/platform.mk
@@ -13,7 +13,7 @@ ifneq ($(findstring HAL_USE_SERIAL TRUE,$(HALCONF)),)
 PLATFORMSRC += ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/LLD/hal_serial_lld.c
 endif
 ifneq ($(findstring HAL_USE_SPI TRUE,$(HALCONF)),)
-PLATFORMSRC += ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c
+PLATFORMSRC += ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/LLD/hal_spi_lld.c
 endif
 ifneq ($(findstring HAL_USE_EXT TRUE,$(HALCONF)),)
 PLATFORMSRC += ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/NRF51822/hal_ext_lld_isr.c \
@@ -46,7 +46,7 @@ PLATFORMSRC  = ${CHIBIOS}/os/hal/ports/common/ARMCMx/nvic.c \
                ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/LLD/hal_pal_lld.c \
                ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/LLD/hal_serial_lld.c \
                ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/LLD/hal_st_lld.c \
-               ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c \
+               ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/LLD/hal_spi_lld.c \
                ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/NRF51822/hal_ext_lld_isr.c \
                ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/NRF51822/hal_ext_lld.c \
                ${CHIBIOS_CONTRIB}/os/hal/ports/NRF5/NRF51822/hal_i2c_lld.c \