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Maxim Integrated Products, Inc. retains all * ownership rights. * ******************************************************************************/ #include <stdlib.h> #include <string.h> #include "mxc_sys.h" #include "mxc_device.h" #include "mxc_errors.h" #include "mxc_assert.h" #include "mxc_lock.h" #include "dma.h" #include "crc_regs.h" #include "crc_reva.h" /***** Global Variables *****/ static mxc_crc_reva_req_t *CRCreq; /* ************************************************************************* */ /* Global Control/Configuration functions */ /* ************************************************************************* */ int MXC_CRC_RevA_Init(mxc_crc_reva_regs_t *crc) { crc->ctrl = 0x00; crc->val = 0xFFFFFFFF; return E_NO_ERROR; } int MXC_CRC_RevA_Shutdown(mxc_crc_reva_regs_t *crc) { crc->ctrl &= ~MXC_F_CRC_REVA_CTRL_EN; return E_NO_ERROR; } int MXC_CRC_RevA_Handler(int ch, int error) { if (error == E_NO_ERROR) { CRCreq->resultCRC = MXC_CRC_GetResult(); } return error; } /* ************************************************************************* */ /* Cyclic Redundancy Check(CRC) functions */ /* ************************************************************************* */ /*******************************/ /* Low Level Functions */ /*******************************/ void MXC_CRC_RevA_SetDirection(mxc_crc_reva_regs_t *crc, mxc_crc_reva_bitorder_t bitOrder) { MXC_SETFIELD(crc->ctrl, MXC_F_CRC_REVA_CTRL_MSB, bitOrder << MXC_F_CRC_REVA_CTRL_MSB_POS); } mxc_crc_bitorder_t MXC_CRC_RevA_GetDirection(mxc_crc_reva_regs_t *crc) { return !!(crc->ctrl & MXC_F_CRC_REVA_CTRL_MSB); } void MXC_CRC_RevA_SwapDataIn(mxc_crc_reva_regs_t *crc, mxc_crc_reva_bitorder_t bitOrder) { MXC_SETFIELD(crc->ctrl, MXC_F_CRC_REVA_CTRL_BYTE_SWAP_IN, bitOrder << MXC_F_CRC_REVA_CTRL_BYTE_SWAP_IN_POS); } void MXC_CRC_RevA_SwapDataOut(mxc_crc_reva_regs_t *crc, mxc_crc_reva_bitorder_t bitOrder) { MXC_SETFIELD(crc->ctrl, MXC_F_CRC_REVA_CTRL_BYTE_SWAP_OUT, bitOrder << MXC_F_CRC_REVA_CTRL_BYTE_SWAP_OUT_POS); } void MXC_CRC_RevA_SetPoly(mxc_crc_reva_regs_t *crc, uint32_t poly) { crc->poly = poly; } uint32_t MXC_CRC_RevA_GetPoly(mxc_crc_reva_regs_t *crc) { return crc->poly; } uint32_t MXC_CRC_RevA_GetResult(mxc_crc_reva_regs_t *crc) { return crc->val; } /*******************************/ /* High Level Functions */ /*******************************/ int MXC_CRC_RevA_Compute(mxc_crc_reva_regs_t *crc, mxc_crc_reva_req_t *req) { int i = 0; volatile int length; if (req == NULL) { return E_NULL_PTR; } if (req->dataBuffer == NULL) { return E_NULL_PTR; } if (req->dataLen == 0) { return E_INVALID; } crc->ctrl |= MXC_F_CRC_REVA_CTRL_EN; length = req->dataLen; while (length--) { crc->datain32 = req->dataBuffer[i++]; while (crc->ctrl & MXC_F_CRC_REVA_CTRL_BUSY) {} } // Store the crc value req->resultCRC = MXC_CRC_GetResult(); return E_NO_ERROR; } int MXC_CRC_RevA_ComputeAsync(mxc_crc_reva_regs_t *crc, mxc_crc_reva_req_t *req) { uint8_t channel; mxc_dma_config_t config; mxc_dma_srcdst_t srcdst; if (req == NULL) { return E_NULL_PTR; } if (req->dataBuffer == NULL) { return E_NULL_PTR; } if (req->dataLen == 0) { return E_INVALID; } CRCreq = req; MXC_DMA_Init(); channel = MXC_DMA_AcquireChannel(); config.reqsel = MXC_DMA_REQUEST_CRCTX; config.ch = channel; config.srcwd = MXC_DMA_WIDTH_BYTE; config.dstwd = MXC_DMA_WIDTH_BYTE; config.srcinc_en = 1; config.dstinc_en = 0; srcdst.ch = channel; srcdst.source = (uint8_t *)req->dataBuffer; //transfering bytes srcdst.len = req->dataLen * 4; //number of bytes MXC_CRC->ctrl |= MXC_F_CRC_CTRL_DMA_EN; MXC_CRC->ctrl |= MXC_F_CRC_CTRL_EN; MXC_DMA_ConfigChannel(config, srcdst); MXC_DMA_SetCallback(channel, MXC_CRC_Handler); MXC_DMA_EnableInt(channel); MXC_DMA_Start(channel); //MXC_DMA->ch[channel].ctrl |= MXC_F_DMA_CTRL_CTZ_IE; MXC_DMA_SetChannelInterruptEn(channel, 0, 1); return E_NO_ERROR; }