[paparazzi-commits] [4243] Allow SD card to operate on SPI0

[Martin Mueller]

Revision: 4243
          http://svn.sv.gnu.org/viewvc/?view=rev&root=paparazzi&revision=4243
Author:   mmm
Date:     2009-10-12 06:28:13 +0000 (Mon, 12 Oct 2009)
Log Message:
-----------
Allow SD card to operate on SPI0

Added Paths:
-----------
    paparazzi3/trunk/sw/airborne/arm7/lpcusb/examples/lpc2000_spi0.c

Added: paparazzi3/trunk/sw/airborne/arm7/lpcusb/examples/lpc2000_spi0.c
===================================================================
--- paparazzi3/trunk/sw/airborne/arm7/lpcusb/examples/lpc2000_spi0.c            
                (rev 0)
+++ paparazzi3/trunk/sw/airborne/arm7/lpcusb/examples/lpc2000_spi0.c    
2009-10-12 06:28:13 UTC (rev 4243)
@@ -0,0 +1,192 @@
+/*****************************************************************************\
+*              efs - General purpose Embedded Filesystem library              *
+*          --------------------- -----------------------------------          *
+*                                                                             *
+* Filename : lpc2000_spi.c                                                     
*
+* Description : This  contains the functions needed to use efs for        *
+*               accessing files on an SD-card connected to an LPC2xxx.        *
+*                                                                             *
+* This library is free software; you can redistribute it and/or               *
+* modify it under the terms of the GNU Lesser General Public                  *
+* License as published by the Free Software Foundation; either                *
+* version 2.1 of the License, or (at your option) any later version.          *
+*                                                                             *
+* This library is distributed in the hope that it will be useful,             *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of              *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU           *
+* Lesser General Public License for more details.                             *
+*                                                                             *
+*                                                    (c)2005 Martin Thomas    *
+*                                                                             *
+\*****************************************************************************/
+
+/*
+       2006, Bertrik Sikken, modified for LPCUSB
+*/
+
+
+/*****************************************************************************/
+#include "type.h"
+#include "usbdebug.h"
+
+#include "spi.h"
+/*****************************************************************************/
+
+/* General Purpose Input/Output (GPIO) */
+#define IOPIN0         (*((volatile unsigned long *) 0xE0028000))
+#define IOSET0         (*((volatile unsigned long *) 0xE0028004))
+#define IODIR0         (*((volatile unsigned long *) 0xE0028008))
+#define IOCLR0         (*((volatile unsigned long *) 0xE002800C))
+#define IOPIN1         (*((volatile unsigned long *) 0xE0028010))
+#define IOSET1         (*((volatile unsigned long *) 0xE0028014))
+#define IODIR1         (*((volatile unsigned long *) 0xE0028018))
+#define IOCLR1         (*((volatile unsigned long *) 0xE002801C))
+
+/* Pin Connect Block */
+#define PINSEL0        (*((volatile unsigned long *) 0xE002C000))
+#define PINSEL1        (*((volatile unsigned long *) 0xE002C004))
+#define PINSEL2        (*((volatile unsigned long *) 0xE002C014))    
+
+/* SPI0 (Serial Peripheral Interface 0) */
+#define S0SPCR                 *(volatile unsigned int *)0xE0020000
+#define S0SPSR                 *(volatile unsigned int *)0xE0020004
+#define S0SPDR                 *(volatile unsigned int *)0xE0020008
+#define S0SPCCR                        *(volatile unsigned int *)0xE002000C
+#define S0SPTCR                        *(volatile unsigned int *)0xE0020010
+#define S0SPTSR                        *(volatile unsigned int *)0xE0020014
+#define S0SPTOR                        *(volatile unsigned int *)0xE0020018
+#define S0SPINT                        *(volatile unsigned int *)0xE002001C
+
+
+// SP0SPCR  Bit-Definitions
+#define CPHA    3
+#define CPOL    4
+#define MSTR    5
+// SP0SPSR  Bit-Definitions
+#define SPIF    7
+
+#define SPI_IODIR      IODIR0
+#define SPI_IOSET      IOSET0
+#define SPI_PINSEL     PINSEL0
+
+#define SPI_SCK_PIN    4    /* Clock       P0.4  out */
+#define SPI_MISO_PIN   5    /* from Card   P0.5  in  */
+#define SPI_MOSI_PIN   6    /* to Card     P0.6  out */
+#define SPI_SS_PIN        7    /* Card-Select P0.7 - GPIO out */
+
+#define SPI_SCK_FUNCBIT   8
+#define SPI_MISO_FUNCBIT  10
+#define SPI_MOSI_FUNCBIT  12
+#define SPI_SS_FUNCBIT    14
+
+#define SPI_PRESCALE_REG  S0SPCCR
+#define SPI_PRESCALE_MIN  8
+
+#define SELECT_CARD()   IOCLR0 = (1<<SPI_SS_PIN)
+#define UNSELECT_CARD()        IOSET0 = (1<<SPI_SS_PIN)
+
+/*****************************************************************************/
+
+/*****************************************************************************/
+
+// Utility-functions which does not toggle CS.
+// Only needed during card-init.
+
+static U8 my_SPISend(U8 outgoing)
+{
+       S0SPDR = outgoing;
+       while( !(S0SPSR & (1<<SPIF)) ) { ; }    
+
+       return S0SPDR;
+}
+
+/*****************************************************************************/
+
+void SPISetSpeed(U8 speed)
+{
+       speed &= 0xFE;
+       if (speed < SPI_PRESCALE_MIN) {
+               speed = SPI_PRESCALE_MIN;
+       }
+       SPI_PRESCALE_REG = speed;
+}
+
+/*****************************************************************************/
+
+void SPIInit(void)
+{
+       U8 i;
+
+       DBG("spiInit for SPI(0)\n");
+
+       // setup GPIO
+       SPI_IODIR |= (1 << SPI_SCK_PIN) | (1 << SPI_MOSI_PIN) | (1 << 
SPI_SS_PIN);
+       SPI_IODIR &= ~(1 << SPI_MISO_PIN);
+
+       // set Chip-Select high - unselect card
+       UNSELECT_CARD();
+       
+       SPI_PINSEL |= ( (1<<SPI_SCK_FUNCBIT) | (1<<SPI_MISO_FUNCBIT) |
+               (1<<SPI_MOSI_FUNCBIT) );
+       // enable SPI-Master
+       S0SPCR = (1<<MSTR)|(0<<CPOL);
+
+       // low speed during init
+       SPISetSpeed(254);
+
+       /* Send 20 spi commands with card not selected */
+       for (i = 0; i < 21; i++) {
+               my_SPISend(0xff);
+       }
+
+       // SPI clock 15MHz @60MHz PCLK
+       SPISetSpeed(2);
+}
+
+/*****************************************************************************/
+
+/*****************************************************************************/
+
+U8 SPISend(U8 outgoing)
+{
+       U8 incoming;
+
+       SELECT_CARD();
+       S0SPDR = outgoing;
+       while( !(S0SPSR & (1<<SPIF)) ) ;
+       incoming = S0SPDR;
+       UNSELECT_CARD();
+
+       return incoming;
+}
+
+
+void SPISendN(U8 * pbBuf, int iLen)
+{
+       int i;
+       U8 temp;
+
+       SELECT_CARD();
+       for (i = 0; i < iLen; i++) {
+        S0SPDR = pbBuf[i];
+       while( !(S0SPSR & (1<<SPIF)) ) ;
+        temp = S0SPDR;
+       }
+       UNSELECT_CARD();
+}
+
+
+void SPIRecvN(U8 * pbBuf, int iLen)
+{
+       int i;
+
+       SELECT_CARD();
+       for (i = 0; i < iLen; i++) {
+        S0SPDR = 0xFF;
+       while( !(S0SPSR & (1<<SPIF)) ) ;
+               pbBuf[i] = S0SPDR;
+       }
+       UNSELECT_CARD();
+}
+
+/*****************************************************************************/