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yegaogang
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/*
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* @brief SD Card Interface registers and control functions
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2014
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "chip.h"
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#if defined(CHIP_LPC177X_8X) || defined(CHIP_LPC40XX)
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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static void writeDelay(void)
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{
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volatile uint8_t i;
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for ( i = 0; i < 0x10; i++ ) { /* delay 3MCLK + 2PCLK */
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}
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}
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Set power state of SDC peripheral */
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void Chip_SDC_PowerControl(LPC_SDC_T *pSDC, SDC_PWR_CTRL_T pwrMode, uint32_t flag)
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{
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pSDC->POWER = SDC_PWR_CTRL(pwrMode) | flag;
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writeDelay();
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}
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/* Set clock divider for SDC peripheral */
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void Chip_SDC_SetClockDiv(LPC_SDC_T *pSDC, uint8_t div)
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{
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uint32_t temp;
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temp = (pSDC->CLOCK & (~SDC_CLOCK_CLKDIV_BITMASK));
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pSDC->CLOCK = temp | (SDC_CLOCK_CLKDIV(div));
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writeDelay();
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}
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/* Clock control for SDC peripheral*/
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void Chip_SDC_ClockControl(LPC_SDC_T *pSDC, SDC_CLOCK_CTRL_T ctrlType,
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FunctionalState NewState)
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{
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if (NewState) {
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pSDC->CLOCK |= (1 << ctrlType);
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}
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else {
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pSDC->CLOCK &= (~(1 << ctrlType));
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}
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writeDelay();
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}
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/* Initialize SDC peripheral */
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static void SDC_Init(LPC_SDC_T *pSDC)
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{
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/* Disable SD_CLK */
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Chip_SDC_ClockControl(pSDC, SDC_CLOCK_ENABLE, DISABLE);
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/* Power-off */
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Chip_SDC_PowerControl(pSDC, SDC_POWER_OFF, 0);
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writeDelay();
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/* Disable all interrupts */
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pSDC->MASK0 = 0;
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/*Setting for timeout problem */
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pSDC->DATATIMER = 0x1FFFFFFF;
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pSDC->COMMAND = 0;
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writeDelay();
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pSDC->DATACTRL = 0;
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writeDelay();
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/* clear all pending interrupts */
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pSDC->CLEAR = SDC_CLEAR_ALL;
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}
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/* Initializes the SDC card controller */
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void Chip_SDC_Init(LPC_SDC_T *pSDC)
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{
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uint32_t i = 0;
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SDC);
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Chip_SYSCTL_PeriphReset(SYSCTL_RESET_PCSDC);
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/* Initialize GPDMA controller */
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Chip_GPDMA_Init(LPC_GPDMA);
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/* Initialize SDC peripheral */
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SDC_Init(pSDC);
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/* Power-up SDC Peripheral */
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Chip_SDC_PowerControl(pSDC, SDC_POWER_UP, 0);
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/* delays for the supply output is stable*/
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for ( i = 0; i < 0x80000; i++ ) {}
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Chip_SDC_SetClock(pSDC, SDC_IDENT_CLOCK_RATE);
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Chip_SDC_ClockControl(pSDC, SDC_CLOCK_ENABLE, ENABLE);
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/* Power-on SDC Interface */
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Chip_SDC_PowerControl(pSDC, SDC_POWER_ON, 0);
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}
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/* Set Command Info */
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void Chip_SDC_SetCommand(LPC_SDC_T *pSDC, uint32_t Cmd, uint32_t Arg)
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{
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/* Clear status register */
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pSDC->CLEAR = SDC_CLEAR_ALL;
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/* Set the argument first, finally command */
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pSDC->ARGUMENT = Arg;
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/* Write command value, enable the command */
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pSDC->COMMAND = Cmd | SDC_COMMAND_ENABLE;
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writeDelay();
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}
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/* Reset Command Info */
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void Chip_SDC_ResetCommand(LPC_SDC_T *pSDC)
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{
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pSDC->CLEAR = SDC_CLEAR_ALL;
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pSDC->ARGUMENT = 0xFFFFFFFF;
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pSDC->COMMAND = 0;
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writeDelay();
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}
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/* Get Command response */
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void Chip_SDC_GetResp(LPC_SDC_T *pSDC, SDC_RESP_T *pResp)
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{
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uint8_t i;
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pResp->CmdIndex = SDC_RESPCOMMAND_VAL(pSDC->RESPCMD);
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for (i = 0; i < SDC_CARDSTATUS_BYTENUM; i++) {
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pResp->Data[i] = pSDC->RESPONSE[i];
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}
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}
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/* Setup Data Transfer Information */
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void Chip_SDC_SetDataTransfer(LPC_SDC_T *pSDC, SDC_DATA_TRANSFER_T *pTransfer)
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{
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uint32_t DataCtrl = 0;
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pSDC->DATATIMER = pTransfer->Timeout;
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pSDC->DATALENGTH = pTransfer->BlockNum * SDC_DATACTRL_BLOCKSIZE_VAL(pTransfer->BlockSize);
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DataCtrl = SDC_DATACTRL_ENABLE;
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DataCtrl |= ((uint32_t) pTransfer->Dir) | ((uint32_t) pTransfer->Mode) | SDC_DATACTRL_BLOCKSIZE(
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pTransfer->BlockSize);
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if (pTransfer->DMAUsed) {
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DataCtrl |= SDC_DATACTRL_DMA_ENABLE;
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}
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pSDC->DATACTRL = DataCtrl;
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writeDelay();
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}
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/* Write data to FIFO */
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void Chip_SDC_WriteFIFO(LPC_SDC_T *pSDC, uint32_t *pSrc, bool bFirstHalf)
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{
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uint8_t start = 0, end = 7;
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if (!bFirstHalf) {
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start += 8;
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end += 8;
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}
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for (; start <= end; start++) {
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pSDC->FIFO[start] = *pSrc;
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pSrc++;
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}
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}
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/* Read data from FIFO */
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void Chip_SDC_ReadFIFO(LPC_SDC_T *pSDC, uint32_t *pDst, bool bFirstHalf)
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{
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uint8_t start = 0, end = 7;
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if (!bFirstHalf) {
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start += 8;
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end += 8;
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}
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for (; start <= end; start++) {
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*pDst = pSDC->FIFO[start];
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pDst++;
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}
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}
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/* Set SD_CLK Clock */
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void Chip_SDC_SetClock(LPC_SDC_T *pSDC, uint32_t freq)
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{
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uint32_t PClk;
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uint32_t ClkValue = 0;
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PClk = Chip_Clock_GetPeripheralClockRate();
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ClkValue = (PClk + 2 * freq - 1) / (2 * freq);
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if (ClkValue > 0) {
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ClkValue -= 1;
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}
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Chip_SDC_SetClockDiv(pSDC, ClkValue);
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}
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/* Shutdown the SDC card controller */
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void Chip_SDC_DeInit(LPC_SDC_T *pSDC)
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{
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/* Power-off */
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Chip_SDC_PowerControl(pSDC, SDC_POWER_OFF, 0);
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Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SDC);
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}
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#endif /* defined(CHIP_LPC177X_8X) || defined(CHIP_LPC4XX) */
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