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author | Konstantin K. Oblaukhov <oblaukhov.konstantin@gmail.com> | 2018-11-20 09:52:01 +0700 |
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committer | Konstantin K. Oblaukhov <oblaukhov.konstantin@gmail.com> | 2018-11-20 09:52:01 +0700 |
commit | ca35947f8132f1879b2706ecceb82c112bfe0f71 (patch) | |
tree | d35c00a3c15507fe0fb58ec2c78681f35b163254 /os/hal/ports/NRF5/LLD/RNGv1 | |
parent | 1391af251d17e4d6256175fd1140d70e3eae8be4 (diff) | |
download | ChibiOS-Contrib-ca35947f8132f1879b2706ecceb82c112bfe0f71.tar.gz ChibiOS-Contrib-ca35947f8132f1879b2706ecceb82c112bfe0f71.tar.bz2 ChibiOS-Contrib-ca35947f8132f1879b2706ecceb82c112bfe0f71.zip |
Reorganize NRF5x driver files.
Diffstat (limited to 'os/hal/ports/NRF5/LLD/RNGv1')
-rw-r--r-- | os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.c | 169 | ||||
-rw-r--r-- | os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.h | 159 |
2 files changed, 328 insertions, 0 deletions
diff --git a/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.c b/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.c new file mode 100644 index 0000000..bf9382c --- /dev/null +++ b/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.c @@ -0,0 +1,169 @@ +/* + RNG for ChibiOS - Copyright (C) 2016 Stephane D'Alu + + 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 RNGv1/hal_rng_lld.c + * @brief NRF5 RNG subsystem low level driver source. + * + * @addtogroup RNG + * @{ + */ + +#include "hal.h" + +#if (HAL_USE_RNG == TRUE) || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Driver local definitions. */ +/*===========================================================================*/ + +/** + * @brief RNG default configuration. + */ +static const RNGConfig default_config = { + .digital_error_correction = 1, +}; + +/*===========================================================================*/ +/* Driver exported variables. */ +/*===========================================================================*/ + +/** @brief RNGD1 driver identifier.*/ +#if NRF5_RNG_USE_RNG0 || defined(__DOXYGEN__) +RNGDriver RNGD1; +#endif + +/*===========================================================================*/ +/* Driver local variables and types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local functions. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver interrupt handlers. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Low level RNG driver initialization. + * + * @notapi + */ +void rng_lld_init(void) { + rngObjectInit(&RNGD1); + RNGD1.rng = NRF_RNG; + RNGD1.irq = RNG_IRQn; +} + +/** + * @brief Configures and activates the RNG peripheral. + * + * @param[in] rngp pointer to the @p RNGDriver object + * + * @notapi + */ +void rng_lld_start(RNGDriver *rngp) { + NRF_RNG_Type *rng = rngp->rng; + + /* If not specified, set default configuration */ + if (rngp->config == NULL) + rngp->config = &default_config; + + /* Configure digital error correction */ + if (rngp->config->digital_error_correction) + rng->CONFIG |= RNG_CONFIG_DERCEN_Msk; + else + rng->CONFIG &= ~RNG_CONFIG_DERCEN_Msk; + + /* Clear pending events */ + rng->EVENTS_VALRDY = 0; +#if CORTEX_MODEL >= 4 + (void)rng->EVENTS_VALRDY; +#endif + + /* Set interrupt mask */ + rng->INTENSET = RNG_INTENSET_VALRDY_Msk; + + /* Start */ + rng->TASKS_START = 1; +} + + +/** + * @brief Deactivates the RNG peripheral. + * + * @param[in] rngp pointer to the @p RNGDriver object + * + * @notapi + */ +void rng_lld_stop(RNGDriver *rngp) { + NRF_RNG_Type *rng = rngp->rng; + + /* Stop peripheric */ + rng->TASKS_STOP = 1; +} + + +/** + * @brief Write random bytes; + * + * @param[in] rngp pointer to the @p RNGDriver object + * @param[in] n size of buf in bytes + * @param[in] buf @p buffer location + * + * @notapi + */ +msg_t rng_lld_write(RNGDriver *rngp, uint8_t *buf, size_t n, + systime_t timeout) { + NRF_RNG_Type *rng = rngp->rng; + size_t i; + + for (i = 0 ; i < n ; i++) { + /* Wait for byte ready + * It take about 677µs to generate a new byte, not sure if + * forcing a context switch will be a benefit + */ + while (rng->EVENTS_VALRDY == 0) { + /* Sleep and wakeup on ARM event (interrupt) */ + SCB->SCR |= SCB_SCR_SEVONPEND_Msk; + __SEV(); + __WFE(); + __WFE(); + } + + /* Read byte */ + buf[i] = (char)rng->VALUE; + + /* Mark as read */ + rng->EVENTS_VALRDY = 0; +#if CORTEX_MODEL >= 4 + (void)rng->EVENTS_VALRDY; +#endif + + /* Clear interrupt so we can wake up again */ + nvicClearPending(rngp->irq); + } + return MSG_OK; +} + +#endif /* HAL_USE_RNG */ + +/** @} */ diff --git a/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.h b/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.h new file mode 100644 index 0000000..a74f6ef --- /dev/null +++ b/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.h @@ -0,0 +1,159 @@ +/* + RNG for ChibiOS - Copyright (C) 2016 Stephane D'Alu + + 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 RNGv1/hal_rng_lld.h + * @brief NRF5 RNG subsystem low level driver header. + * + * @addtogroup RNG + * @{ + */ + +#ifndef HAL_RNG_LLD_H +#define HAL_RNG_LLD_H + +#if (HAL_USE_RNG == TRUE) || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Driver constants. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver pre-compile time settings. */ +/*===========================================================================*/ + +/** + * @name Configuration options + * @{ + */ +/** + * @brief RNGD1 driver enable switch. + * @details If set to @p TRUE the support for RNGD1 is included. + * @note The default is @p FALSE. + */ +#if !defined(NRF5_RNG_USE_RNG0) || defined(__DOXYGEN__) +#define NRF5_RNG_USE_RNG0 FALSE +#endif + +/** + * @brief RNG interrupt priority level setting for RNG0. + */ +#if !defined(NRF5_RNG_RNG0_IRQ_PRIORITY) || defined(__DOXYGEN__) +#define NRF5_RNG_RNG0_IRQ_PRIORITY 3 +#endif + + +/*===========================================================================*/ +/* Derived constants and error checks. */ +/*===========================================================================*/ + +#if NRF5_RNG_USE_RNG0 == FALSE +#error "Requesting RNG driver, but no RNG peripheric attached" +#endif + +#if NRF5_RNG_USE_RNG0 && \ + !OSAL_IRQ_IS_VALID_PRIORITY(NRF5_RNG_RNG0_IRQ_PRIORITY) +#error "Invalid IRQ priority assigned to RNG0" +#endif + +/*===========================================================================*/ +/* Driver data structures and types. */ +/*===========================================================================*/ + +/** + * @brief Type of a structure representing an RNG driver. + */ +typedef struct RNGDriver RNGDriver; + +/** + * @brief Driver configuration structure. + */ +typedef struct { + /* End of the mandatory fields.*/ + /** + * @brief Activate the digital error correction + * + * @details A digital corrector algorithm is employed to remove any + * bias toward '1' or '0'. Disabling it offers a substantial + * speed advantage, but may result in a statistical distribution + * that is not perfectly uniform. + * + * @note For nRF51, on average, it take 167µs to get a byte without + * digitial error correction and 677µs with, but no garantee + * is made on the necessary time to generate one byte. + */ + uint8_t digital_error_correction:1; +} RNGConfig; + + +/** + * @brief Structure representing an RNG driver. + */ +struct RNGDriver { + /** + * @brief Driver state. + */ + rngstate_t state; + /** + * @brief Current configuration data. + */ + const RNGConfig *config; +#if RNG_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__) + /** + * @brief Mutex protecting the peripheral. + */ + mutex_t mutex; +#endif /* RNG_USE_MUTUAL_EXCLUSION */ + /* End of the mandatory fields.*/ + /** + * @brief Pointer to the RNGx registers block. + */ + NRF_RNG_Type *rng; + /** + * @brief IRQ number + */ + uint32_t irq; +}; + +/*===========================================================================*/ +/* Driver macros. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* External declarations. */ +/*===========================================================================*/ + +#if NRF5_RNG_USE_RNG0 && !defined(__DOXYGEN__) +extern RNGDriver RNGD1; +#endif /* NRF5_RNG_USE_RNG0 */ + +#ifdef __cplusplus +extern "C" { +#endif + void rng_lld_init(void); + void rng_lld_start(RNGDriver *rngp); + void rng_lld_stop(RNGDriver *rngp); + msg_t rng_lld_write(RNGDriver *rngp, uint8_t *buf, size_t n, + systime_t timeout); +#ifdef __cplusplus +} +#endif + +#endif /* HAL_USE_RNG */ + +#endif /* HAL_RNG_LLD_H */ + +/** @} */ |