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[/] [usb_fpga_1_2/] [trunk/] [include/] [ztex-flash1.h] - Blame information for rev 3

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/*!
   ZTEX Firmware Kit for EZ-USB Microcontrollers
   Copyright (C) 2008-2009 ZTEX e.K.
   http://www.ztex.de
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 3 as
   published by the Free Software Foundation.
 
   This program 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
   General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, see http://www.gnu.org/licenses/.
!*/
 
/*
    SPI mode of MMC / *SD Cards
*/
 
#ifeq[MMC_PORT][E]
#define[MMC_bmMODE]
#elifeq[MMC_PORT][A]
#elifeq[MMC_PORT][B]
#elifeq[MMC_PORT][C]
#elifneq[MMC_PORT][D]
#error[Macro `MMC_PORT' is not defined correctly. Valid values are: `A', `B', `C', `D' and `E'.]
#endif
 
#ifndef[ZTEX_FLASH1_H]
#define[ZTEX_FLASH1_H]
 
#define[@CAPABILITY_FLASH;]
 
#ifndef[MMC_PORT]
#error[MMC_PORT not defined]
#endif
 
#ifndef[MMC_BIT_CS]
#error[MMC_BIT_CS not defined]
#endif
 
#ifndef[MMC_BIT_DI]
#error[MMC_BIT_DI not defined]
#endif
 
#ifndef[MMC_BIT_DO]
#error[MMC_BIT_DO not defined]
#endif
 
#ifndef[MMC_BIT_CLK]
#error[MMC_BIT_CLK not defined]
#endif
 
#define[MMC_bmCS][bmBITMMC_BIT_CS]
#define[MMC_bmDI][bmBITMMC_BIT_DI]
#define[MMC_bmDO][bmBITMMC_BIT_DO]
#define[MMC_bmCLK][bmBITMMC_BIT_CLK]
 
#define[MMC_IO][IOMMC_PORT]
 
#ifndef[MMC_bmMODE]
#define[MMC_CS][IOMMC_PORTMMC_BIT_CS]
#define[MMC_CLK][IOMMC_PORTMMC_BIT_CLK]
#define[MMC_DI][IOMMC_PORTMMC_BIT_DI]
#define[MMC_DO][IOMMC_PORTMMC_BIT_DO]
#endif
 
// may be redefined if the first sectors are reserved (e.g. for a FPGA bitstream)
#define[FLASH_FIRST_FREE_SECTOR][0]
 
xdata BYTE flash_enabled;       // 0    1: enabled, 0:disabled
xdata WORD flash_sector_size;   // 1    sector size
xdata DWORD flash_sectors;      // 3    number of sectors
xdata BYTE flash_ec;            // 7    error code
 
xdata BYTE mmc_last_cmd;        // 0
xdata BYTE mmc_response;        // 1
xdata BYTE mmc_buffer[16];      // 2
 
#define[FLASH_EC_CMD_ERROR][1]
#define[FLASH_EC_TIMEOUT][2]
#define[FLASH_EC_BUSY][3]
#define[FLASH_EC_PENDING][4]
#define[FLASH_EC_READ_ERROR][5]
#define[FLASH_EC_WRITE_ERROR][6]
 
/* *********************************************************************
   ***** mmc_clocks ****************************************************
   ********************************************************************* */
// perform c (256 if c=0) clocks
void mmc_clocks (BYTE c) {
        c;                                      // this avoids stupid warnings
_asm
        mov     r2,dpl
#ifdef[MMC_bmMODE]
        mov     a,_MMC_IO
        anl     a, #(~MMC_bmCLK)
        mov     r3, a
        orl     a, #(MMC_bmCLK)
        mov     r4, a
010014$:
        mov     _MMC_IO,r4
        nop
        mov     _MMC_IO,r3
#else
010014$:
        setb    _MMC_CLK
        nop
        clr     _MMC_CLK
#endif
        djnz    r2,010014$
_endasm;
}
 
 
/* *********************************************************************
   ***** flash_read_byte ***********************************************
   ********************************************************************* */
// read a single byte from the flash
BYTE flash_read_byte() { // uses r2,r3,r4
_asm
#ifdef[MMC_bmMODE]
        // 8 - 1 + 8*13 + 1 + 6 = 118 clocks
        mov     a,_MMC_IO
        anl     a, #(~MMC_bmCLK)
        mov     r2, a
        orl     a, #(MMC_bmCLK)
        mov     r3, a
 
        mov     a,_MMC_IO       // 7
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r2
 
        mov     a,_MMC_IO       // 6
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r2
 
        mov     a,_MMC_IO       // 5
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r2
 
        mov     a,_MMC_IO       // 4
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r2
 
        mov     a,_MMC_IO       // 3
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r2
 
        mov     a,_MMC_IO       // 2
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r2
 
        mov     a,_MMC_IO       // 1
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r2
 
        mov     a,_MMC_IO       // 0
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        xrl     a,#255
        mov     _MMC_IO, r2
 
#else
        // 8*7 + 6 = 62 clocks 
        mov     c,_MMC_DO       // 7
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 6
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 5
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 4
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 3
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 2
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 1
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 0
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
#endif
        mov     dpl,a
        ret
_endasm;
        return 0;                // never ever called (just to avoid warnings)
}
 
/* *********************************************************************
   ***** flash_read ****************************************************
   ********************************************************************* */
// read len (256 if len=0) bytes from the flash to the buffer
void flash_read(__xdata BYTE *buf, BYTE len) {
        *buf;                                   // this avoids stupid warnings
        len;                                    // this too
_asm                                            // *buf is in dptr, len is in _flash_read_PARM_2
        mov     r2,_flash_read_PARM_2
#ifdef[MMC_bmMODE]
        mov     a,_MMC_IO
        anl     a, #(~MMC_bmCLK)
        mov     r5, a
        orl     a, #(MMC_bmCLK)
        mov     r3, a
 
010012$:
        // 8 + len*(-1 + 8*13 - 1 + 2 + 9) + 4 = 12 + len*113 clocks
        mov     a,_MMC_IO       // 7
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r5
 
        mov     a,_MMC_IO       // 6
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r5
 
        mov     a,_MMC_IO       // 5
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r5
 
        mov     a,_MMC_IO       // 4
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r5
 
        mov     a,_MMC_IO       // 3
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r5
 
        mov     a,_MMC_IO       // 2
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r5
 
        mov     a,_MMC_IO       // 1
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        mov     r4,a
        mov     _MMC_IO, r5
 
        mov     a,_MMC_IO       // 0
        anl     a,#(MMC_bmDO)
        mov     _MMC_IO, r3
        subb    a,#1
        mov     a,r4
        rlc     a
        xrl     a,#255
        mov     _MMC_IO, r5
#else
010012$:
        // 2 + len*(8*7 + 9) + 4 = 6 + len*65 clocks
        mov     c,_MMC_DO       // 7
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 6
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 5
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 4
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 3
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 2
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 1
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
 
        mov     c,_MMC_DO       // 0
        setb    _MMC_CLK
        rlc     a
        clr     _MMC_CLK
#endif
        movx    @dptr,a
        inc     dptr
        djnz    r2,010012$
_endasm;
}
 
/* *********************************************************************
   ***** flash_write_byte **********************************************
   ********************************************************************* */
// send one bytes from buffer buf to the card
void flash_write_byte (BYTE b) {        // b is in dpl
        b;                              // this avoids stupid warnings
_asm
#ifdef[MMC_bmMODE]
        // up to 7 + 8*12 + 6 = 109 clocks
        mov     a,_MMC_IO
        anl     a, #(255 - MMC_bmCLK - MMC_bmDI )
        mov     r3, a
        mov     a,dpl
 
        rlc     a               // 7
        mov     _MMC_IO,r3
        jnc     0100157$
        orl     _MMC_IO, #(MMC_bmDI)
0100157$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 6
        mov     _MMC_IO,r3
        jnc     0100156$
        orl     _MMC_IO, #(MMC_bmDI)
0100156$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 5
        mov     _MMC_IO,r3
        jnc     0100155$
        orl     _MMC_IO, #(MMC_bmDI)
0100155$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 4
        mov     _MMC_IO,r3
        jnc     0100154$
        orl     _MMC_IO, #(MMC_bmDI)
0100154$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 3
        mov     _MMC_IO,r3
        jnc     0100153$
        orl     _MMC_IO, #(MMC_bmDI)
0100153$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 2
        mov     _MMC_IO,r3
        jnc     0100152$
        orl     _MMC_IO, #(MMC_bmDI)
0100152$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 1
        mov     _MMC_IO,r3
        jnc     0100151$
        orl     _MMC_IO, #(MMC_bmDI)
0100151$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 0
        mov     _MMC_IO,r3
        jnc     0100150$
        orl     _MMC_IO, #(MMC_bmDI)
0100150$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        mov     _MMC_IO,r3
#else
        // 3 + 8*7 + 4 = 63 clocks 
        mov     a,dpl
        rlc     a               // 7
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 6
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 5
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 4
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 3
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 2
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 1
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 0
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        nop
        clr     _MMC_CLK
#endif  
_endasm;
}
 
/* *********************************************************************
   ***** flash_write ***************************************************
   ********************************************************************* */
// write len (256 id len=0) bytes from the buffer to the flash
void flash_write(__xdata BYTE *buf, BYTE len) {
        *buf;                                   // this avoids stupid warnings
        len;                                    // this too
_asm                                            // *buf is in dptr, len is in _flash_read_PARM_2
        mov     r2,_flash_read_PARM_2
#ifdef[MMC_bmMODE]
        // 7 + len*(2 + 8*12 + 7 ) + 6 = 13 + len*105 clocks
        mov     a,_MMC_IO
        anl     a, #(255 - MMC_bmCLK - MMC_bmDI )
        mov     r3, a
010013$:
        movx    a,@dptr
 
        rlc     a               // 7
        mov     _MMC_IO,r3
        jnc     0100167$
        orl     _MMC_IO, #(MMC_bmDI)
0100167$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 6
        mov     _MMC_IO,r3
        jnc     0100166$
        orl     _MMC_IO, #(MMC_bmDI)
0100166$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 5
        mov     _MMC_IO,r3
        jnc     0100165$
        orl     _MMC_IO, #(MMC_bmDI)
0100165$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 4
        mov     _MMC_IO,r3
        jnc     0100164$
        orl     _MMC_IO, #(MMC_bmDI)
0100164$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 3
        mov     _MMC_IO,r3
        jnc     0100163$
        orl     _MMC_IO, #(MMC_bmDI)
0100163$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 2
        mov     _MMC_IO,r3
        jnc     0100162$
        orl     _MMC_IO, #(MMC_bmDI)
0100162$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 1
        mov     _MMC_IO,r3
        jnc     0100161$
        orl     _MMC_IO, #(MMC_bmDI)
0100161$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        rlc     a               // 0
        mov     _MMC_IO,r3
        jnc     0100160$
        orl     _MMC_IO, #(MMC_bmDI)
0100160$:
        orl     _MMC_IO, #(MMC_bmCLK)
 
        inc     dptr
        djnz    r2,010013$
 
        mov     _MMC_IO,r3
#else
010013$:
        // 2 + len*(3 + 8*7 - 1 + 7 ) + 4 = 6 + len*65 clocks
        movx    a,@dptr
        rlc     a               // 7
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 6
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 5
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 4
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 3
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 2
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 1
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        rlc     a               // 0
        clr     _MMC_CLK
 
        mov     _MMC_DI,c
        setb    _MMC_CLK
        inc     dptr
        clr     _MMC_CLK
 
        djnz    r2,010013$
#endif
_endasm;
}
 
/* *********************************************************************
   ***** mmc_wait_busy *************************************************
   ********************************************************************* */
BYTE mmc_wait_busy () {
    WORD i;
    flash_ec = FLASH_EC_BUSY;
    MMC_IO |= MMC_bmDI;                         // avoids that in-data is interpreted as command
    for (i=0; (flash_read_byte()!=255) && i<65535; i++ ) ;
    if ( MMC_IO & MMC_bmDO ) {
        flash_ec = 0;
        return 0;
    }
    return 1;
}
 
/* *********************************************************************
   ***** mmc_select ****************************************************
   ********************************************************************* */
/*
   select the card (CS) and waits if busy
   returns 1 if busy
*/
BYTE mmc_select() {
    MMC_IO |= MMC_bmCS;                         // CS = 1
    mmc_clocks(8);                              // 8 dummy clocks to finish a previous command
    MMC_IO &= ~MMC_bmCS;                        // CS = 0
 
    return mmc_wait_busy();
}
 
/* *********************************************************************
   ***** mmc_deselect **************************************************
   ********************************************************************* */
// de-select the card (CS) and waits if busy
void mmc_deselect() {
    MMC_IO |= MMC_bmDI;                         // CS = 1
    mmc_clocks(8);                              // 8 dummy clocks to finish a previous command
    MMC_IO |= MMC_bmCS;                         // CS = 1
    mmc_clocks(8);                              // 8 more dummy clocks
}
 
/* *********************************************************************
   ***** mmc_read_response *********************************************
   ********************************************************************* */
// read the first response byte
BYTE mmc_read_response() {
        MMC_IO |= MMC_bmDI;                     // avoids that in-data is interpreted as command
_asm
        mov     r2,#0x255
010010$:
        lcall   _flash_read_byte
        mov     a,dpl
        jnb     acc.7,010011$
        djnz    r2, 010010$
 
010011$:
        mov     dptr,#_mmc_response
        movx    @dptr,a
        mov     dpl,a
        ret
_endasm;
        return 0;                                // never ever called, just to avoid stupid warnings
}
 
/* *********************************************************************
   ***** mmc_wait_start ************************************************
   ********************************************************************* */
/*
   wait for the start byte
   returns 1 on error
*/
BYTE mmc_wait_start() {
    WORD to;
    to=0;
    MMC_IO |= MMC_bmDI;                         // avoids that in-data is interpreted as command
    while ( flash_read_byte() != 0xfe ) {       // wait for the start byte
        if ( ++to == 0 )                         // 65536 * 8 clocks
            return 1;
    }
    return 0;
}
 
/* *********************************************************************
   ***** flash_read_init ***********************************************
   ********************************************************************* */
/*
   Start the initialization sequence for reading sector s-
   The whole sector must be read.
   returns an error code (FLASH_EC_*). 0 means no error.
*/
BYTE flash_read_init(DWORD s) {
    if ( (MMC_IO & MMC_bmCS) == 0 ) {
        return FLASH_EC_PENDING;                // we interrupted a pending Flash operation
    }
    if ( mmc_select() ) {                       // select the card
        mmc_deselect();
        return FLASH_EC_BUSY;
    }
    mmc_last_cmd = 17;
    mmc_buffer[0] = 17 | 64;
    s = s << 1;
    mmc_buffer[1] = s >> 16;
    mmc_buffer[2] = s >> 8;
    mmc_buffer[3] = s;
    mmc_buffer[4] = 0;
    mmc_buffer[5] = 1;
    flash_write(mmc_buffer,6);
    mmc_read_response();
    if ( mmc_response != 0 ) {
        mmc_deselect();
        return FLASH_EC_CMD_ERROR;
    }
 
    if ( mmc_wait_start() ) {                   // wait for the start byte
        mmc_deselect();
        return FLASH_EC_TIMEOUT;
    }
    return 0;
}
 
/* *********************************************************************
   ***** flash_read_finish *********************************************
   ********************************************************************* */
/*
   Reads n dummy bytes (the whole sector has to be read out)
   and runs the finalization sequence for a sector read.
*/
void flash_read_finish(WORD n) {
    while ( n > 32 ) {
        mmc_clocks(0);                           // 256 clocks = 32 dummy bytes
        n-=32;
    }
    mmc_clocks(n << 3);
    mmc_clocks(24);                             // 16 CRC + 8 dummy clocks
    mmc_deselect();
}
 
 
/* *********************************************************************
   ***** flash_write_init **********************************************
   ********************************************************************* */
/*
   Start the initialization sequence for writing sector s
   The whole sectir must be written.
   returns an error code (FLASH_EC_*). 0 means no error.
*/
BYTE flash_write_init(DWORD s) {
    if ( (MMC_IO & MMC_bmCS) == 0 ) {
        return FLASH_EC_PENDING;                // we interrupted a pending Flash operation
    }
    if ( mmc_select() ) {                       // select the card
        mmc_deselect();
        return FLASH_EC_BUSY;
    }
    mmc_clocks(8);
    mmc_last_cmd = 24;
    mmc_buffer[0] = 24 | 64;
    s = s << 1;
    mmc_buffer[1] = s >> 16;
    mmc_buffer[2] = s >> 8;
    mmc_buffer[3] = s;
    mmc_buffer[4] = 0;
    mmc_buffer[5] = 1;
    flash_write(mmc_buffer,6);
    mmc_read_response();
    if ( mmc_response != 0 ) {
        mmc_deselect();
        return FLASH_EC_CMD_ERROR;
    }
 
    MMC_IO |= MMC_bmDI;                                 // send one dummy byte plus the start byte 0xfe
    mmc_clocks(15);
    MMC_IO &= ~MMC_bmDI;
    MMC_IO |= MMC_bmCLK;
    MMC_IO &= ~MMC_bmCLK;
    return 0;
}
 
/* *********************************************************************
   ***** flash_write_finish ********************************************
   ********************************************************************* */
/*
   Writes n dummy bytes (the whole sector has to be written)
   and runs the finalization sequence for a sector write
   returns an error code (FLASH_EC_*). 0 means no error.
*/
BYTE flash_write_finish(WORD n) {
    BYTE b;
    MMC_IO &= ~MMC_bmDI;                        // value of the dummy data is 0
    while ( n > 32 ) {
        mmc_clocks(0);                           // 256 clocks = 32 dummy bytes
        n-=32;
    }
    mmc_clocks(n << 3);
 
    MMC_IO |= MMC_bmDI;
    mmc_clocks(16);                             // 16 CRC clocks
    b = flash_read_byte() & 7;
//    mmc_wait_busy();                          // not required here, programming continues if card is deslected
    mmc_deselect();
    if ( b != 5 ) {                             // data response, last three bits must be 5
        return FLASH_EC_WRITE_ERROR;
    }
    return 0;
}
 
/* *********************************************************************
   ***** mmc_send_cmd **************************************************
   ********************************************************************* */
// send a command   
#define[mmc_send_cmd(][,$1);][{                 // send a command, argument=0
    mmc_last_cmd = $0;
    mmc_buffer[0] = 64 | ($0 & 127);
    mmc_buffer[1] = 0;
    mmc_buffer[2] = 0;
    mmc_buffer[3] = 0;
    mmc_buffer[4] = 0;
    mmc_buffer[5] = $1 | 1;
    flash_write(mmc_buffer,6);
    mmc_read_response();
}]
 
/* *********************************************************************
   ***** flash_init ****************************************************
   ********************************************************************* */
// init the card
void flash_init() {
    BYTE i;
 
    flash_enabled = 1;
    flash_sector_size = 512;
 
    OEMMC_PORT = (OEMMC_PORT & ~MMC_bmDO) | ( MMC_bmCS | MMC_bmDI | MMC_bmCLK );
    MMC_IO |= MMC_bmDI;
    MMC_IO |= MMC_bmCS;
    mmc_clocks(0);                               // 256 clocks
 
    mmc_select();                               // select te card
    flash_ec = FLASH_EC_BUSY;
 
    mmc_send_cmd(0, 0x95);                       // send reset command
    if ( mmc_response & ~1 ) {                  // check for errors
        goto mmc_init_cmd_err;
    }
 
    for ( i=0; mmc_response != 0 && i<255; i++ ) {        // send the init command and wait wait (up to 1s) until ready
        wait(4);
        mmc_send_cmd(1, 0xff);
    }
    if ( mmc_response != 0 ) {                   // check for errors
        goto mmc_init_cmd_err;
    }
 
    mmc_send_cmd(9, 0);                          // read the CSD
    if ( mmc_wait_start() ) {
        flash_ec = FLASH_EC_TIMEOUT;
        goto mmc_init_err;
    }
    flash_read(mmc_buffer,16);
    mmc_clocks(16);                             // CRC is clocked out to nirvana
 
    i = (mmc_buffer[5] & 15) + ((mmc_buffer[10] >> 7) | ((mmc_buffer[9] & 3) << 1)) - 7;
    flash_sectors = ((mmc_buffer[8] >> 6) | (mmc_buffer[7] << 2) | ((mmc_buffer[6] & 3) << 10)) + 1;
    flash_sectors = flash_sectors << i;
 
    flash_ec = 0;
    mmc_deselect();
 
    return;
 
mmc_init_cmd_err:
    flash_ec = FLASH_EC_CMD_ERROR;
mmc_init_err:
    flash_enabled = 0;
    mmc_deselect();
}
 
 
/* *********************************************************************
   ***** EP0 vendor request 0x40 ***************************************
   ********************************************************************* */
// send mmc information structure (card size, error status,  ...) to the host
ADD_EP0_VENDOR_REQUEST((0x40,,
    MEM_COPY1(flash_enabled,EP0BUF,8);
    EP0BCH = 0;
    EP0BCL = 8;
,,
));;
 
/* *********************************************************************
   ***** EP0 vendor request 0x41 ***************************************
   ********************************************************************* */
void mmc_read_ep0 () {
    flash_read(EP0BUF, ep0_payload_transfer);
    if ( ep0_payload_remaining == 0 ) {
        mmc_clocks(24);                         // 16 CRC + 8 dummy clocks
        mmc_deselect();
    }
}
 
ADD_EP0_VENDOR_REQUEST((0x41,,                  // read (exactly) one sector
    if ( (MMC_IO & MMC_bmCS) == 0 ) {
        flash_ec = FLASH_EC_PENDING;            // we interrupted a pending Flash operation
        EP0_STALL;
    }
    if ( mmc_select() ) {                       // select the card
        mmc_deselect();
        EP0_STALL;
    }
    mmc_last_cmd = 17;
    mmc_buffer[0] = 17 | 64;
_asm
    clr c
    mov dptr,#(_SETUPDAT + 2)
    movx a,@dptr
    mov dptr,#(_mmc_buffer + 3)
    rlc a
    movx @dptr,a
 
    mov dptr,#(_SETUPDAT + 3)
    movx a,@dptr
    mov dptr,#(_mmc_buffer + 2)
    rlc a
    movx @dptr,a
 
    mov dptr,#(_SETUPDAT + 4)
    movx a,@dptr
    mov dptr,#(_mmc_buffer + 1)
    rlc a
    movx @dptr,a
_endasm;
    mmc_buffer[4] = 0;
    mmc_buffer[5] = 1;
    flash_write(mmc_buffer,6);
    mmc_read_response();
    if ( mmc_response != 0 ) {
        flash_ec = FLASH_EC_CMD_ERROR;
        mmc_deselect();
        EP0_STALL;
    }
 
    if ( mmc_wait_start() ) {                   // wait for the start byte
        flash_ec = FLASH_EC_TIMEOUT;
        mmc_deselect();
        EP0_STALL;
    }
 
    mmc_read_ep0();
    EP0BCH = 0;
    EP0BCL = ep0_payload_transfer;
,,
    if ( ep0_payload_transfer != 0 ) {
        mmc_read_ep0();
    }
    EP0BCH = 0;
    EP0BCL = ep0_payload_transfer;
));;
 
/* *********************************************************************
   ***** EP0 vendor command 0x42 ***************************************
   ********************************************************************* */
void mmc_send_ep0 () {
    flash_write(EP0BUF, ep0_payload_transfer);
    if ( ep0_payload_remaining == 0 ) {
        MMC_IO |= MMC_bmDI;
        mmc_clocks(16);                         // 16 CRC clocks
        if ( (flash_read_byte() & 7) != 5 ) {   // data response, last three bits must be 5
            flash_ec = FLASH_EC_WRITE_ERROR;
        }
//      mmc_wait_busy();                        // not required here, programming continues if card is deselected
        mmc_deselect();
    }
}
 
ADD_EP0_VENDOR_COMMAND((0x42,,                  // write (exactly!) one sector
    if ( (MMC_IO & MMC_bmCS) == 0 ) {
        flash_ec = FLASH_EC_PENDING;            // we interrupted a pending Flash operation
        EP0_STALL;
    }
    if ( mmc_select() ) {                       // select the card
        mmc_deselect();
        EP0_STALL;
    }
    mmc_last_cmd = 24;
    mmc_buffer[0] = 24 | 64;
_asm
    clr c
    mov dptr,#(_SETUPDAT + 2)
    movx a,@dptr
    mov dptr,#(_mmc_buffer + 3)
    rlc a
    movx @dptr,a
 
    mov dptr,#(_SETUPDAT + 3)
    movx a,@dptr
    mov dptr,#(_mmc_buffer + 2)
    rlc a
    movx @dptr,a
 
    mov dptr,#(_SETUPDAT + 4)
    movx a,@dptr
    mov dptr,#(_mmc_buffer + 1)
    rlc a
    movx @dptr,a
_endasm;
    mmc_buffer[4] = 0;
    mmc_buffer[5] = 1;
    flash_write(mmc_buffer,6);
    mmc_read_response();
    if ( mmc_response != 0 ) {
        flash_ec = FLASH_EC_CMD_ERROR;
        mmc_deselect();
        EP0_STALL;
    }
 
    MMC_IO |= MMC_bmDI;                                 // send one dummy byte plus the start byte 0xfe
    mmc_clocks(15);
    MMC_IO &= ~MMC_bmDI;
    MMC_IO |= MMC_bmCLK;
    MMC_IO &= ~MMC_bmCLK;
,,
    if ( ep0_payload_transfer != 0 ) {
        flash_ec = 0;
        mmc_send_ep0();
        if ( flash_ec != 0 ) {
            EP0_STALL;
        }
    }
));;
 
/* *********************************************************************
   ***** EP0 vendor request 0x43 ***************************************
   ********************************************************************* */
// send detailed MMC status plus debug information
ADD_EP0_VENDOR_REQUEST((0x43,,                  // this may interrupt a pending operation
    MEM_COPY1(flash_ec,EP0BUF+2,19);
    EP0BUF[21] = (MMC_IO & MMC_bmDO) == 0;
    mmc_select();
    mmc_send_cmd(13, 0);
    EP0BUF[0] = mmc_response;
    EP0BUF[1] = flash_read_byte();
    mmc_deselect();
    EP0BCH = 0;
    EP0BCL = 22;
,,
));;
 
#endif  /*ZTEX_FLASH1_H*/
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[/] [usb_fpga_1_2/] [trunk/] [include/] [ztex-flash1.h] - Blame information for rev 3

Line No.	Rev	Author	Line
1	2	ZTEX	`/*!`
2			`ZTEX Firmware Kit for EZ-USB Microcontrollers`
3			`Copyright (C) 2008-2009 ZTEX e.K.`
4			`http://www.ztex.de`
5
6			`This program is free software; you can redistribute it and/or modify`
7			`it under the terms of the GNU General Public License version 3 as`
8			`published by the Free Software Foundation.`
9
10			`This program is distributed in the hope that it will be useful, but`
11			`WITHOUT ANY WARRANTY; without even the implied warranty of`
12			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
13			`General Public License for more details.`
14
15			`You should have received a copy of the GNU General Public License`
16			`along with this program; if not, see http://www.gnu.org/licenses/.`
17			`!*/`
18
19			`/*`
20	3	ZTEX	`SPI mode of MMC / *SD Cards`
21	2	ZTEX	`*/`
22
23	3	ZTEX	`#ifeq[MMC_PORT][E]`
24			`#define[MMC_bmMODE]`
25			`#elifeq[MMC_PORT][A]`
26			`#elifeq[MMC_PORT][B]`
27			`#elifeq[MMC_PORT][C]`
28			`#elifneq[MMC_PORT][D]`
29			#error[Macro `MMC_PORT' is not defined correctly. Valid values are: `A', `B', `C', `D' and `E'.]
30			`#endif`
31	2	ZTEX
32	3	ZTEX	`#ifndef[ZTEX_FLASH1_H]`
33			`#define[ZTEX_FLASH1_H]`
34
35			`#define[@CAPABILITY_FLASH;]`
36
37			`#ifndef[MMC_PORT]`
38			`#error[MMC_PORT not defined]`
39	2	ZTEX	`#endif`
40