git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@79 35acf78f-673a-0410-8e92-d51de3d6d3f4
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/*
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ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <ch.h>
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#include "lpc214x.h"
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#include "lpc214x_ssp.h"
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#include "mmcsd.h"
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static EventSource MMCInsertEventSource;
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void MMCInit(void) {
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chEvtInit(&MMCInsertEventSource);
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}
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/*
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* Initializes a card after the power up by selecting the SPI mode.
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*/
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BOOL mmcInit(void) {
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/*
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* Starting initialization with slow clock mode.
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*/
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SetSSP(254, CR0_DSS8BIT | CR0_FRFSPI | CR0_CLOCKRATE(0), 0);
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/*
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* SPI mode selection.
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*/
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sspRW(NULL, NULL, 16); /* 128 clock pulses without ~CS asserted. */
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int i = 0;
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while (TRUE) {
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chThdSleep(10);
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if (mmcSendCommand(0, 0) == 0x01)
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break;
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if (++i >= CMD0_RETRY)
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return TRUE;
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}
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/*
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* Initialization.
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*/
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i = 0;
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while (TRUE) {
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BYTE8 b;
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chThdSleep(10);
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b = mmcSendCommand(0, 0);
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if (b == 0x00)
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break;
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if (b != 0x01)
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return TRUE;
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if (++i >= CMD1_RETRY)
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return TRUE;
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}
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/*
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* Full speed.
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*/
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SetSSP(2, CR0_DSS8BIT | CR0_FRFSPI | CR0_CLOCKRATE(0), 0);
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return FALSE;
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}
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/*
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* Sends a simple command and returns a R1-type response.
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*/
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BYTE8 mmcSendCommand(BYTE8 cmd, ULONG32 arg) {
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BYTE8 buf[6];
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buf[0] = 0x40 | cmd;
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buf[1] = arg >> 24;
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buf[2] = arg >> 16;
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buf[3] = arg >> 8;
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buf[4] = arg;
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buf[5] = 0x95; /* Valid for CMD0 ingnored by other commands. */
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sspAcquireBus();
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sspRW(NULL, buf, 6);
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sspRW(buf, NULL, 1);
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sspReleaseBus();
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return buf[0];
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}
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@ -0,0 +1,31 @@
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/*
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ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _MMCSD_H_
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#define _MMCSD_H_
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#define CMD0_RETRY 10
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#define CMD1_RETRY 100
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void MMCInit(void);
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BOOL mmcInit(void);
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BYTE8 mmcSendCommand(BYTE8 cmd, ULONG32 arg);
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#endif /* _MMCSD_H_*/
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