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* Add CRC DriverMichael Spradling2015-08-161-0/+36
This patch includes a high level and two low level drivers. The high level driver is enabled with flag HAL_USE_CRC The low level drivers include: * Hardware CRC for the STM32 cortex processor lines.(when supported) * Enabled with flag STM32_CRC_USE_CRC1 * DMA is enabled with CRC_USE_DMA * SYNC api will use DMA, but put calling thread to sleep * ASYNC api enabled. * DMA Disabled * SYNC api spin while calculating CRC * ASYNC api disabled * Software CRC (3 modes) * CRCSW_CRC32_TABLE - Enables crc32 with lookup table. * CRCSW_CRC16_TABLE - Enables crc16 with lookup tables. * CRCSW_PROGRAMMBLE - Enables any crc done with computation. * Can calculate any crc configuration. * CRC_USE_DMA obviously not support with software CRC