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author | barthess <barthess@yandex.ru> | 2016-04-07 16:39:12 +0300 |
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committer | barthess <barthess@yandex.ru> | 2016-04-07 16:39:12 +0300 |
commit | 9d74dd2661b80a5ae8598591f0251b197cc51756 (patch) | |
tree | 0c833cbd2f4cf5845358ee0f37fbb3f95b7a447b /os/hal/ports/STM32/LLD/CRCv1/hal_crc_lld.c | |
parent | b86af2c09feea9b50cb241c147a3881e55763a55 (diff) | |
download | ChibiOS-Contrib-9d74dd2661b80a5ae8598591f0251b197cc51756.tar.gz ChibiOS-Contrib-9d74dd2661b80a5ae8598591f0251b197cc51756.tar.bz2 ChibiOS-Contrib-9d74dd2661b80a5ae8598591f0251b197cc51756.zip |
STM32 mass update to current naming convention in ChibiOS
Diffstat (limited to 'os/hal/ports/STM32/LLD/CRCv1/hal_crc_lld.c')
-rw-r--r-- | os/hal/ports/STM32/LLD/CRCv1/hal_crc_lld.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/os/hal/ports/STM32/LLD/CRCv1/hal_crc_lld.c b/os/hal/ports/STM32/LLD/CRCv1/hal_crc_lld.c new file mode 100644 index 0000000..601deca --- /dev/null +++ b/os/hal/ports/STM32/LLD/CRCv1/hal_crc_lld.c @@ -0,0 +1,328 @@ +/* + ChibiOS - Copyright (C) 2015 Michael D. Spradling + + 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 STM32/CRCv1/crc_lld.c + * @brief STM32 CRC subsystem low level driver source. + * + * @addtogroup CRC + * @{ + */ + +#include "hal.h" + +#if (HAL_USE_CRC == TRUE) || defined(__DOXYGEN__) + +/** + * Allow CRC Software override for ST drivers. Some ST CRC implimentations + * have limited capabilities. + */ +#if CRCSW_USE_CRC1 != TRUE + +/*===========================================================================*/ +/* Driver local definitions. */ +/*===========================================================================*/ + +/** + * @brief CRC default configuration. + */ +static const CRCConfig default_config = { + .poly_size = 32, + .poly = 0x04C11DB7, + .initial_val = 0xFFFFFFFF, + .final_val = 0xFFFFFFFF, + .reflect_data = 1, + .reflect_remainder = 1 +}; + +/*===========================================================================*/ +/* Driver exported variables. */ +/*===========================================================================*/ + +/** @brief CRC1 driver identifier.*/ +#if STM32_CRC_USE_CRC1 || defined(__DOXYGEN__) +CRCDriver CRCD1; +#endif + +/*===========================================================================*/ +/* Driver local variables and types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local functions. */ +/*===========================================================================*/ + +void _crc_lld_calc_byte(CRCDriver *crcp, uint8_t data) { + __IO uint8_t *crc8 = (__IO uint8_t*)&(crcp->crc->DR); + *crc8 = data; +} + +/* + * @brief Returns calculated CRC from last reset + * + * @param[in] crcp pointer to the @p CRCDriver object + * @param[in] data data to be added to crc + * + * @notapi + */ +void _crc_lld_calc_halfword(CRCDriver *crcp, uint16_t data) { + __IO uint16_t *crc16 = (__IO uint16_t*)&(crcp->crc->DR); + *crc16 = data; +} + +/* + * @brief Returns calculated CRC from last reset + * + * @param[in] crcp pointer to the @p CRCDriver object + * @param[in] data data to be added to crc + * + * @notapi + */ +void _crc_lld_calc_word(CRCDriver *crcp, uint32_t data) { + crcp->crc->DR = data; +} + + +/*===========================================================================*/ +/* Driver interrupt handlers. */ +/*===========================================================================*/ + +/** + * @brief Shared end-of-rx service routine. + * + * @param[in] crcp pointer to the @p CRCDriver object + * @param[in] flags pre-shifted content of the ISR register + */ +#if CRC_USE_DMA == TRUE +static void crc_lld_serve_interrupt(CRCDriver *crcp, uint32_t flags) { + + /* DMA errors handling.*/ +#if defined(STM32_CRC_DMA_ERROR_HOOK) + if ((flags & (STM32_DMA_ISR_TEIF | STM32_DMA_ISR_DMEIF)) != 0) { + STM32_CRC_DMA_ERROR_HOOK(crcp); + } +#else + (void)flags; +#endif + + /* Stop everything.*/ + dmaStreamDisable(crcp->dma); + + /* Portable CRC ISR code defined in the high level driver, note, it is + a macro.*/ + _crc_isr_code(crcp, crcp->crc->DR ^ crcp->config->final_val); +} +#endif + +/*===========================================================================*/ +/* Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Low level CRC driver initialization. + * + * @notapi + */ +void crc_lld_init(void) { + crcObjectInit(&CRCD1); + CRCD1.crc = CRC; +#if CRC_USE_DMA == TRUE + CRCD1.dma = STM32_CRC_CRC1_DMA_STREAM; +#endif +} + +/** + * @brief Configures and activates the CRC peripheral. + * + * @param[in] crcp pointer to the @p CRCDriver object + * + * @notapi + */ +void crc_lld_start(CRCDriver *crcp) { + if (crcp->config == NULL) + crcp->config = &default_config; + + rccEnableCRC(FALSE); + +#if STM32_CRC_PROGRAMMABLE == TRUE + crcp->crc->INIT = crcp->config->initial_val; + crcp->crc->POL = crcp->config->poly; + + crcp->crc->CR = 0; + switch(crcp->config->poly_size) { + case 32: + break; + case 16: + crcp->crc->CR |= CRC_CR_POLYSIZE_0; + break; + case 8: + crcp->crc->CR |= CRC_CR_POLYSIZE_1; + break; + case 7: + crcp->crc->CR |= CRC_CR_POLYSIZE_1 | CRC_CR_POLYSIZE_0; + break; + default: + osalDbgAssert(false, "hardware doesn't support polynomial size"); + break; + }; + if (crcp->config->reflect_data) { + crcp->crc->CR |= CRC_CR_REV_IN_1 | CRC_CR_REV_IN_0; + } + if (crcp->config->reflect_remainder) { + crcp->crc->CR |= CRC_CR_REV_OUT; + } +#else + osalDbgAssert(crcp->config->initial_val != default_config.initial_val, + "hardware doesn't support programmable initial value"); + osalDbgAssert(crcp->config->poly_size != default_config.poly_size, + "hardware doesn't support programmable polynomial size"); + osalDbgAssert(crcp->config->poly != default_config.poly, + "hardware doesn't support programmable polynomial"); + osalDbgAssert(crcp->config->reflect_data != default_config.reflect_data, + "hardware doesn't support reflect of input data"); + osalDbgAssert(crcp->config->reflect_remainder != default_config.reflect_remainder, + "hardware doesn't support reflect of output remainder"); +#endif + +#if CRC_USE_DMA == TRUE +#if STM32_CRC_PROGRAMMABLE == TRUE + crcp->dmamode = STM32_DMA_CR_DIR_M2M | STM32_DMA_CR_PINC | + STM32_DMA_CR_MSIZE_BYTE | STM32_DMA_CR_PSIZE_BYTE | + STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE | + STM32_DMA_CR_PL(STM32_CRC_CRC1_DMA_PRIORITY); +#else + crcp->dmamode = STM32_DMA_CR_DIR_M2M | STM32_DMA_CR_PINC | + STM32_DMA_CR_MSIZE_WORD | STM32_DMA_CR_PSIZE_WORD | + STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE | + STM32_DMA_CR_PL(STM32_CRC_CRC1_DMA_PRIORITY); +#endif + { + bool b; + b = dmaStreamAllocate(crcp->dma, + STM32_CRC_CRC1_DMA_IRQ_PRIORITY, + (stm32_dmaisr_t)crc_lld_serve_interrupt, + (void *)crcp); + osalDbgAssert(!b, "stream already allocated"); + } +#endif +} + + +/** + * @brief Deactivates the CRC peripheral. + * + * @param[in] crcp pointer to the @p CRCDriver object + * + * @notapi + */ +void crc_lld_stop(CRCDriver *crcp) { +#if CRC_USE_DMA == TRUE + dmaStreamRelease(crcp->dma); +#else + (void)crcp; +#endif + rccDisableCRC(FALSE); +} + +/** + * @brief Resets current CRC calculation. + * + * @param[in] crcp pointer to the @p CRCDriver object + * + * @notapi + */ +void crc_lld_reset(CRCDriver *crcp) { + crcp->crc->CR |= CRC_CR_RESET; +} + +/** + * @brief Returns calculated CRC from last reset + * + * @param[in] crcp pointer to the @p CRCDriver object + * @param[in] n size of buf in bytes + * @param[in] buf @p buffer location + * + * @notapi + */ +uint32_t crc_lld_calc(CRCDriver *crcp, size_t n, const void *buf) { +#if CRC_USE_DMA == TRUE + crc_lld_start_calc(crcp, n, buf); + (void) osalThreadSuspendS(&crcp->thread); +#else + /** + * BUG: Only peform byte writes to DR reg if reflect_data is disabled. + * The STM32 hardware unit seems to incorrectly calculate CRCs when all + * of the following is true: reflect_data(rev_in) is 0, dma is disable, and + * you are writing more than a byte into the DR register. + */ + if (crcp->config->reflect_data != 0) { + while(n > 3) { + _crc_lld_calc_word(crcp, *(uint32_t*)buf); + buf+=4; + n-=4; + } + } + +#if STM32_CRC_PROGRAMMABLE == TRUE + /* Programmable CRC units allow variable register width accesses.*/ + + /** + * BUG: Only peform byte writes to DR reg if reflect_data is disabled. + * The STM32 hardware unit seems to incorrectly calculate CRCs when all + * of the following is true: reflect_data(rev_in) is 0, dma is disable, and + * you are writing more than a byte into the DR register. + */ + if (crcp->config->reflect_data != 0) { + while(n > 1) { + _crc_lld_calc_halfword(crcp, *(uint16_t*)buf); + buf+=2; + n-=2; + } + } + + while(n > 0) { + _crc_lld_calc_byte(crcp, *(uint8_t*)buf); + buf++; + n--; + } +#else + osalDbgAssert(n != 0, "STM32 CRC Unit only supports WORD accesses"); +#endif + +#endif + return crcp->crc->DR ^ crcp->config->final_val; +} + +#if CRC_USE_DMA == TRUE +void crc_lld_start_calc(CRCDriver *crcp, size_t n, const void *buf) { + dmaStreamSetPeripheral(crcp->dma, buf); + dmaStreamSetMemory0(crcp->dma, &crcp->crc->DR); +#if STM32_CRC_PROGRAMMABLE == TRUE + dmaStreamSetTransactionSize(crcp->dma, n); +#else + dmaStreamSetTransactionSize(crcp->dma, (n / 4)); +#endif + dmaStreamSetMode(crcp->dma, crcp->dmamode); + + dmaStreamEnable(crcp->dma); +} +#endif + +#endif /* CRCSW_USE_CRC1 */ + +#endif /* HAL_USE_CRC */ + +/** @} */ |