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sdspidrv.c
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sdspidrv.c
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////////////////////////////////////////////////////////////////////////////////
//
// Filename: sw/sdspidrv.c
// {{{
// Project: SD-Card controller
//
// Purpose: Provides low-level access to the SD-Card SPI controller.
// Primary functions provided here are sdspi_init() to initialize
// the card, sdspi_read(sector, buffer) and sdspi_write(sector, buffer)
// to read from and write to the card respectively.
//
// Creator: Dan Gisselquist, Ph.D.
// Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
// }}}
// Copyright (C) 2016-2024, Gisselquist Technology, LLC
// {{{
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY 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. (It's in the $(ROOT)/doc directory. Run make with no
// target there if the PDF file isn't present.) If not, see
// <http://www.gnu.org/licenses/> for a copy.
// }}}
// License: GPL, v3, as defined and found on www.gnu.org,
// {{{
// http://www.gnu.org/licenses/gpl.html
//
////////////////////////////////////////////////////////////////////////////////
//
// }}}
#define STDIO_DEBUG
#include <stdlib.h>
#include <stdint.h>
typedef uint8_t BYTE;
typedef uint16_t WORD;
typedef uint32_t DWORD, LBA_t, UINT;
#include <diskio.h>
#ifdef STDIO_DEBUG
#include <stdio.h>
#include <stdlib.h>
#define txstr(A) printf("%s", A)
#define txhex(A) printf("%08x", A)
#define txdecimal(A) printf("%d", A)
#else
// Embedded I/O functions txstr() and txhex
#include "txfns.h"
#endif
#include "sdspidrv.h"
#define SDSPI_SETAUX 0x0000ff
#define SDSPI_READAUX 0x0000bf
#define SDSPI_CMD 0x000040
#define SDSPI_ACMD (0x040+55) // CMD55
#define SDSPI_FIFO_OP 0x000800 // Read only
#define SDSPI_WRITEOP 0x000c00 // Write to the FIFO
#define SDSPI_ALTFIFO 0x001000
#define SDSPI_BUSY 0x004000
#define SDSPI_ERROR 0x008000
#define SDSPI_CLEARERR 0x008000
// #define SDSPI_CRCERR 0x010000
// #define SDSPI_ERRTOK 0x020000
#define SDSPI_REMOVED 0x040000
#define SDSPI_PRESENTN 0x080000
#define SDSPI_RESET 0x100000 // Read only
#define SDSPI_WATCHDOG 0x200000 // Read only
#define SDSPI_GO_IDLE ((SDSPI_REMOVED|SDSPI_CLEARERR|SDSPI_CMD)+0)
#define SDSPI_READ_SECTOR ((SDSPI_CMD|SDSPI_CLEARERR|SDSPI_FIFO_OP)+17)
#define SDSPI_WRITE_SECTOR ((SDSPI_CMD|SDSPI_CLEARERR|SDSPI_WRITEOP)+24)
#define SDERR_READ 0x001
#define SDERR_WRITE 0x002
#define SDERR_INIT 0x010
#define SPEED_25MHZ 0x01
#define SPEED_17MHZ 0x02
#define SPEED_12MHZ 0x03
#define SPEED_10MHZ 0x04
#define SPEED_400KHZ 0x7c
#define SPEED_200KHZ 0xf9
#define SPEED_100KHZ 0x1f3
#define SPEED_SLOW SPEED_400KHZ
#define SPEED_FAST SPEED_25MHZ
// #define SPEED_FAST SPEED_17MHZ
// #define SPEED_FAST SPEED_400KHZ
#define SECTOR_8B 0x030000 // Used by SCR register
#define SECTOR_16B 0x040000 // CSD and CID registers
#define SECTOR_512B 0x090000 // 512-byte disk sectors
//
//
// Book recommen ds sequence of: CMD0, (CMD8), CMD58, ACMD41(wait), CMD58
// for startup
//
// #include "zipsys.h"
// #include <zipcpu.h>
#define SDSPI_READREG 0x0200 // Expect an R3 or R7 response (R1 + 32-bits)
//
// Provide DMA support
//
// If INLUDE_DMA_CONTROLLER is set, then we'll build to use the DMA to transfer
// data to and from the SDSPI controller
//
#ifdef INCLUDE_DMA_CONTROLLER
const int SDUSEDMA = 1;
#else
const int SDUSEDMA = 0;
#endif
typedef struct SDSPI_S {
volatile unsigned sd_ctrl, sd_data, sd_fifo[2];
} SDSPI;
typedef struct SDSPIDRV_S {
SDSPI *d_dev;
char d_SCR[8];
char d_CSD[16], d_CID[16];
uint32_t d_OCR;
uint32_t d_sector_count, d_block_size;
} SDSPIDRV;
#define SDSPI_WAIT_WHILE_BUSY(DEV) { int r; do { r = DEV->d_dev->sd_ctrl; if (r & (SDSPI_ERROR|SDSPI_PRESENTN)) break; } while(r & SDSPI_BUSY); }
//
// SCOPE
//
// If defined, references the address of a WBSCOPE on the bus which can be used
// for debugging various interactions
// #define SCOPE _scope_sdcard
//
//
// Book recommends sequence of: CMD0, (CMD8), CMD58, ACMD41(wait), CMD58
// for startup
//
int sdcard_err = 0;
//
// SDDEBUG
//
// If set will produce verbose output via txstr() and txhex(). These functions
// are roughly equivalent to printf("%s",X) and printf("%08x", X) respectively.
static const int SDDEBUG = 0;
//
// SDINFO
//
// If set, will produce output indicating the results of transactions.
static const int SDINFO = 0;
static int sdspi_read_ocr(SDSPIDRV *dev) {
// {{{
unsigned v;
if (SDDEBUG)
txstr("SDCARD: CMD58, READ-OCR\n");
//
// CMD58 : READ-OCR
// After the card is ready, we must send a READ_OCR command next
// The card will respond with an R7
//
dev->d_dev->sd_data = 0x0;
dev->d_dev->sd_ctrl = (SDSPI_CMD|SDSPI_READREG) + 58; // 0x027a;
SDSPI_WAIT_WHILE_BUSY(dev);
if ((v = dev->d_dev->sd_ctrl)!= 0) {
sdcard_err |= SDERR_INIT | 0x10000;
if (SDDEBUG) {
txstr("READ-OCR: Ctrl != 0, ");
txhex(v);
txstr("\r\n");
}
}
dev->d_OCR = dev->d_dev->sd_data;
if (SDINFO) {
txstr("READ-OCR: OCR = "); txhex(dev->d_OCR); txstr("\n");
// printf(" OCR = 0x%08x%s\n", v, (v!=0x40ff8000)?"Shouldnt this be 0x40ff8000?":"");
if (dev->d_OCR & 0x80000000)
txstr(" Card is still powering up\n");
if (dev->d_OCR & 0x40000000)
txstr(" CCS: High capacity support\n");
if (dev->d_OCR & 0x20000000)
txstr(" UHS: USH-II card\n");
if (dev->d_OCR & 0x01000000)
txstr(" S18A: Switching to 1.8V allowed\n");
#ifdef STDIO_DEBUG
int mxv = 0, mnv = 0;
if (dev->d_OCR & 0x00800000) {
if ((mxv == 0)||(mxv <= 36))
mxv = 36;
if ((mnv == 0)||(mnv >= 35))
mnv = 35;
} if (dev->d_OCR & 0x00400000) {
if ((mxv == 0)||(mxv <= 35))
mxv = 35;
if ((mnv == 0)||(mnv >= 34))
mnv = 34;
} if (dev->d_OCR & 0x00200000) {
if ((mxv == 0)||(mxv <= 34))
mxv = 34;
if ((mnv == 0)||(mnv >= 33))
mnv = 33;
} if (dev->d_OCR & 0x00100000) {
if ((mxv == 0)||(mxv <= 33))
mxv = 33;
if ((mnv == 0)||(mnv >= 32))
mnv = 32;
} if (dev->d_OCR & 0x00080000) {
if ((mxv == 0)||(mxv <= 32))
mxv = 32;
if ((mnv == 0)||(mnv >= 31))
mnv = 31;
} if (dev->d_OCR & 0x00040000) {
if ((mxv == 0)||(mxv <= 31))
mxv = 31;
if ((mnv == 0)||(mnv >= 30))
mnv = 30;
} if (dev->d_OCR & 0x00020000) {
if ((mxv == 0)||(mxv <= 30))
mxv = 30;
if ((mnv == 0)||(mnv >= 29))
mnv = 29;
} if (dev->d_OCR & 0x00010000) {
if ((mxv == 0)||(mxv <= 29))
mxv = 29;
if ((mnv == 0)||(mnv >= 28))
mnv = 28;
} if (dev->d_OCR & 0x00008000) {
if ((mxv == 0)||(mxv <= 28))
mxv = 28;
if ((mnv == 0)||(mnv >= 27))
mnv = 27;
}
printf(" Voltage ranges supported: %d.%dV - %d.%dV\n",
(mxv/10), (mxv%10), (mnv/10), (mnv%10));
#else
if (dev->d_OCR & 0x00800000)
txstr(" 3.6-3.5 V allowed\n");
if (dev->d_OCR & 0x00400000)
txstr(" 3.5-3.4 V allowed\n");
if (dev->d_OCR & 0x00200000)
txstr(" 3.4-3.3 V allowed\n");
if (dev->d_OCR & 0x00100000)
txstr(" 3.3-3.2 V allowed\n");
if (dev->d_OCR & 0x00080000)
txstr(" 3.2-3.1 V allowed\n");
if (dev->d_OCR & 0x00040000)
txstr(" 3.1-3.0 V allowed\n");
if (dev->d_OCR & 0x00020000)
txstr(" 3.0-2.9 V allowed\n");
if (dev->d_OCR & 0x00010000)
txstr(" 2.9-2.8 V allowed\n");
if (dev->d_OCR & 0x00008000)
txstr(" 2.8-2.7 V allowed\n");
#endif
}
return dev->d_OCR;
}
// }}}
//
// Read the SCR register
static int sdspi_read_scr(SDSPIDRV *dev) {
// {{{
unsigned v;
if (SDDEBUG)
txstr("READ-SCR\n");
// The SCR register is 64 bits, and we can read it at fast speed
dev->d_dev->sd_data = SECTOR_8B | SPEED_FAST;
dev->d_dev->sd_ctrl = SDSPI_SETAUX;
//
dev->d_dev->sd_data = 0;
dev->d_dev->sd_ctrl = (SDSPI_CLEARERR|SDSPI_ACMD); // Go to alt command set
SDSPI_WAIT_WHILE_BUSY(dev);
if (dev->d_dev->sd_ctrl & (SDSPI_ERROR | SDSPI_REMOVED)) {
sdcard_err |= SDERR_INIT | 0x4000000;
return -1;
}
dev->d_dev->sd_data = 0x0; // Read from position zero
dev->d_dev->sd_ctrl = (SDSPI_CLEARERR|SDSPI_FIFO_OP|SDSPI_CMD)+51;
SDSPI_WAIT_WHILE_BUSY(dev);
if ((v = dev->d_dev->sd_ctrl) != 0)
sdcard_err |= SDERR_INIT | 0x4000000;
if ((v = dev->d_dev->sd_data) != 0xffffffff)
sdcard_err |= SDERR_INIT | 0x8000000;
if (SDINFO) txstr("SCR: ");
for(v=0; v<8; v+=4) {
unsigned u;
u = dev->d_dev->sd_fifo[0];
if (SDINFO) { txhex(u); if (v+4 < 8) txstr(":");
else txstr("\r\n"); }
dev->d_SCR[v+3] = u & 0x0ff; u>>= 8;
dev->d_SCR[v+2] = u & 0x0ff; u>>= 8;
dev->d_SCR[v+1] = u & 0x0ff; u>>= 8;
dev->d_SCR[v+0] = u & 0x0ff;
}
if (dev->d_dev->sd_ctrl & SDSPI_ERROR)
return -1;
return 0;
}
// }}}
//
// Read the CSD register
//
static int sdspi_read_csd(SDSPIDRV *dev) {
// {{{
unsigned *ucsd = (unsigned *)dev->d_CSD;
int i;
unsigned v;
if (sdcard_err != 0)
return -1;
if (SDDEBUG)
txstr("READ-CSD\n");
//
// Adjust the FIFO for a 4-word length
//
dev->d_dev->sd_ctrl = SDSPI_READAUX;
// 16 byte block length
dev->d_dev->sd_data = SECTOR_16B;
// Write config data, read last config data
dev->d_dev->sd_ctrl = SDSPI_SETAUX;
//
// CMD9 : SEND_CSD_COND
// Send CSD condition to FIFO #0 (Requires FIFO support)
//
dev->d_dev->sd_data = 0;
dev->d_dev->sd_ctrl = (SDSPI_CLEARERR|SDSPI_FIFO_OP|SDSPI_CMD) + 9; // 0x08849;
SDSPI_WAIT_WHILE_BUSY(dev);
if ((v = dev->d_dev->sd_ctrl) != 0) {
txstr("READ-CSD: Invalid CSD return control value, ");
txhex(v);
txstr("\n");
sdcard_err |= SDERR_INIT | 0x20000;
return sdcard_err;
} if ((v = dev->d_dev->sd_data) != 0) {
if (v & 0x010)
txstr("READ-CSD: Return indicates CRC ERR, ");
else
txstr("READ-CSD: Unexpected return data, ");
txhex(v);
txstr("\n");
sdcard_err |= SDERR_INIT | 0x40000;
return sdcard_err;
}
for(i=0; i<4; i++)
ucsd[i] = dev->d_dev->sd_fifo[0];
if (SDINFO) {
txstr("CSD: ");
txhex(ucsd[0]);
txstr(":");
txhex(ucsd[1]);
txstr(":");
txhex(ucsd[2]);
txstr(":");
txhex(ucsd[3]);
txstr("\n");
}
// 40,0e,00,32, 5b,59,00,00, e8,37,7f,80, 0a,40,00,23,
// CSD_STRUCTURE = 2'b01 (CSD version 2.0)
// 6'h00 (Reserved)
//
// TAAC = 0x0e (always 0x0e in v2)
//
// NSAC = 0x00 (always 0 in v2)
//
// TRAN_SPEED=0x32 (25MHz max operating speed)
//
// CCC = 0x5b5
// READ_BL_LEN = 0x9, max block read length is 512 bytes
//
// READ_BL_PARTIAL = 0
// WRITE_BLK_MISALIGN = 0
// READ_BLK_MISALIGN = 0
// DSR_IMP = 0
// 2'b00 (reserved)
// C_SIZE = 22'h00e837=>(59447+1)/2MB = 29,724MB
//
//
// 1'b0 (reserved)
// ERASE_BLK_EN = 1'b1 (Host can erase units of 512 bytes)
// SECTOR_SIZE = 7'b11_1111_1 (128 write blocks, 64kB ea)
// WP_GRP_SIZE = 7'h00 (one erase sector)
//
// WP_GRP_ENABLE = 1'b0 (No group write protection possible)
// 2'b00 (reserved)
// R2W_FACTOR = 3'b010 (writes are 4x slower than reads)
// WRITE_BL_LEN = 4'h9 (512 bytes)
// WRITE_BL_PARTIAL = 1'b0 (Only 512 byte units may be written)
// 5'h00 (reserved)
//
// FILE_FORMAT_GRP = 1'b0 (HD type file system w/partition tbl)
// COPY = 1'b0 (Contents are original, not copied)
// PERM_WRITE_PROTECT = 1'b0 (No permanent write protect)
// TMP_WRITE_PROTECT = 1'b0 (No temporary write protect)
// FILE_FORMAT = 2'b00 (As above, HD typ fmt, w/ partition tbl)
// 2'b00 (reserved)
//
// CRC = { 7'h11, 1'b1 }
//
// Derived values:
// BLOCK_LEN = 2^READ_BL_LEN = 512
return 0;
}
// }}}
static int sdspi_read_cid(SDSPIDRV *dev) {
// {{{
unsigned *ucid = (unsigned *)dev->d_CID;
int i;
unsigned v;
if (SDDEBUG)
txstr("READ-CID\n");
// CMD10 : SEND_CID_COND
// Send CID condition to FIFO #1 (Requires reading from FIFO)
//
// Adjust the FIFO for a 4-word length
//
dev->d_dev->sd_ctrl = SDSPI_READAUX;
// 16 byte block length
dev->d_dev->sd_data = SECTOR_16B;
// Write config data, read last config data
dev->d_dev->sd_ctrl = SDSPI_SETAUX;
dev->d_dev->sd_data = 0x0;
dev->d_dev->sd_ctrl = (SDSPI_CLEARERR|SDSPI_FIFO_OP|SDSPI_CMD)+10; // 0x0984a;
SDSPI_WAIT_WHILE_BUSY(dev);
if ((v = dev->d_dev->sd_ctrl) != 0x0) { // Expecting 0x0
txstr("READ-CID: Expecting a control response of 0x0, not ");
txhex(v);
txstr("\r\n");
sdcard_err |= SDERR_INIT | 0x100000;
}
if ((v = dev->d_dev->sd_data) != 0) {
if (v & 0x10)
txstr("READ-CID: Rcvd a CRC err, ");
else
txstr("READ-CID: Expecting a data field of 0x..f00, not ");
txhex(v);
txstr("\r\n");
sdcard_err |= SDERR_INIT | 0x200000;
}
// 0x0824d; // CMD thirteen -- SEND_STATUS
dev->d_dev->sd_data = 0x0;
dev->d_dev->sd_ctrl = (SDSPI_CLEARERR|SDSPI_READREG|SDSPI_CMD)+ 13;
SDSPI_WAIT_WHILE_BUSY(dev);
// Read out the CID
for(i=0; i<4; i++)
ucid[i] = dev->d_dev->sd_fifo[0];
if (1 || SDINFO) {
txstr("CID: ");
txhex(ucid[0]); txstr(":");
txhex(ucid[1]); txstr(":");
txhex(ucid[2]); txstr(":");
txhex(ucid[3]); txstr("\n");
}
if ((v = dev->d_dev->sd_ctrl) != 0) { // 0
txstr("READ-CID: 2nd read, expecting control value of 0, not ");
txhex(v);
txstr("\r\n");
// sdcard_err |= SDERR_INIT | 0x400000;
}
if ((v = dev->d_dev->sd_data) != 0x00ffffff) { // Finally, read the cards status
txstr("READ-CID: 2nd cmd, expecting a data value of -1, not ");
txhex(v);
txstr("\r\n");
// sdcard_err |= SDERR_INIT | 0x800000;
}
#ifdef STDIO_DEBUG
if (SDINFO) {
unsigned sn, md;
//
// Here's an example of how this might break down
//
// 03,53,44,53, 44,33,32,47, 30,7c,13,03, 66,00,ea,25,
// MID = 0x03; // Manufacturer ID
// OID = 0x5344; // OEM/Application ID
// PNM = 0x5344333247 = "SD32G" // Product Name
// PRV = 0x30; // Product Revision
// PSN = 0x7c130366; // Product Serial Number
// Reserved= 4'h0
// MDT = 0x0ea // Manufacturing Date, (October, 2014)
// CRC = 0x25 = {7'h12, 1'b1}
sn = (dev->d_CID[9]&0x0ff);
sn = (sn<<8) | (dev->d_CID[10]&0x0ff);
sn = (sn<<8) | (dev->d_CID[11]&0x0ff);
sn = (sn<<8) | (dev->d_CID[12]&0x0ff);
md = (dev->d_CID[13] & 0x0f);
md = (md << 8) | (dev->d_CID[14] & 0x0ff);
printf("CID:\n"
"\tManufacturer ID: 0x%02x\n"
"\tApplication ID: %c%c\n"
"\tProduct Name: %c%c%c%c%c\n"
"\tProduct Revision: %x.%x\n"
"\tSerial Number: 0x%0x\n",
dev->d_CID[0]&0x0ff,
dev->d_CID[1], dev->d_CID[2],
dev->d_CID[3], dev->d_CID[4], dev->d_CID[5],
dev->d_CID[6], dev->d_CID[7],
(dev->d_CID[8]>>4)&0xf, dev->d_CID[8]&0x0f,
sn);
printf(
"\tYear of Man.: %d\n"
"\tMonth of Man.: %d\n",
((md>>4)+2000), md&0x0f);
}
#endif
return (sdcard_err == 0) ? 0 : -1;
}
// }}}
//
//
// DUMP Control register
//
//
static void sdspi_dump_ctrlreg(const unsigned rv) {
// {{{
txstr("CONTROL-REG: "); txhex(rv);
if (rv & SDSPI_WATCHDOG)
txstr("\r\n Watchdog-err");
if (rv & SDSPI_RESET)
txstr("\r\n Needs reset");
if (rv & SDSPI_REMOVED)
txstr("\r\n Removed");
if (rv & SDSPI_PRESENTN)
txstr("\r\n Not present");
// if (rv & SDSPI_ERRTOK)
// txstr("\r\n Error token");
// if (rv & SDSPI_CRCERR)
// txstr("\r\n CRC Error");
if (rv & SDSPI_ERROR)
txstr("\r\n Generic Error");
if (rv & SDSPI_BUSY)
txstr("\r\n Busy");
if (rv & SDSPI_ALTFIFO)
txstr("\r\n Alternate FIFO");
if (rv & SDSPI_FIFO_OP)
txstr("\r\n Memory operation");
txstr("\r\n R1 : "); txhex(rv & 0x0ff);
txstr("\r\n");
}
// }}}
//
//
// DUMP R1
//
//
static void sdspi_dump_r1(const unsigned rv) {
// {{{
txstr("R1 Decode: "); txhex(rv & 0x0ff);
if (rv & 0x01)
txstr("\r\n Card is still in idle");
if (rv & 0x02)
txstr("\r\n Erase reset");
if (rv & 0x04)
txstr("\r\n Illegal command");
if (rv & 0x08)
txstr("\r\n Com CRC error");
if (rv & 0x10)
txstr("\r\n Erase sequence err");
if (rv & 0x20)
txstr("\r\n Address error");
if (rv & 0x40)
txstr("\r\n Parameter error");
txstr("\r\n");
}
// }}}
static void sdspi_dump_r2(const unsigned rv) {
// {{{
if (SDDEBUG) {
unsigned uv = rv >> 16;
txstr("R2 Decode: "); txhex(uv & 0x0ffff);
if (uv & 0x01)
txstr("\r\n Card is locked");
if (uv & 0x02)
txstr("\r\n Unlock command failed");
if (uv & 0x04)
txstr("\r\n Error");
if (uv & 0x08)
txstr("\r\n CC Error");
if (uv & 0x10)
txstr("\r\n Card ECC failed");
if (uv & 0x20)
txstr("\r\n WP violation");
if (uv & 0x40)
txstr("\r\n Erase param");
if (uv & 0x80)
txstr("\r\n Out of range | CSD overwrite");
txstr("\r\n");
sdspi_dump_r1(uv >> 8);
}
}
// }}}
static void sdspi_dump_sector(const unsigned *ubuf) {
// {{{
int j;
for(j=0; j<512/4; j++) {
txhex(ubuf[j]);
if ((j&7)==7)
txstr("\r\n");
else
txstr(" ");
} txstr("\r\n");
}
// }}}
static unsigned sdspi_get_r2(SDSPIDRV *dev) {
// {{{
dev->d_dev->sd_ctrl = SDSPI_ERROR | SDSPI_READREG | SDSPI_CMD + 13;
SDSPI_WAIT_WHILE_BUSY(dev);
if (SDDEBUG) {
txstr("SD_WRITE.STAT: Status return, "); txhex(dev->d_dev->sd_ctrl);
txstr(" : "); txhex(dev->d_dev->sd_data);
txstr("\r\n");
sdspi_dump_r2(dev->d_dev->sd_ctrl);
}
}
// }}}
SDSPIDRV *sdspi_init(SDSPI *dev) {
// {{{
// int *data = debug_data;
int i, j;
unsigned v;
SDSPIDRV *dv = (SDSPIDRV *)malloc(sizeof(SDSPIDRV));
dv->d_dev = dev;
dv->d_sector_count = 0;
dv->d_block_size = 0;
#ifdef SCOPE
const unsigned SCOPEDELAY = 0x100;
SCOPE->s_ctrl = WBSCOPE_DISABLE | SCOPEDELAY;
#endif
if (SDDEBUG)
txstr("SDCARD-INIT\n");
// Start us out slow, with a known sector length
dev->sd_data = SECTOR_512B | SPEED_SLOW; // 128 word block length, 400kHz clock
dev->sd_ctrl = SDSPI_SETAUX; // Write config data, read last config data
// Clear any prior pending errors
dev->sd_data = 0;
dev->sd_ctrl = SDSPI_CLEARERR|SDSPI_READAUX;
sdcard_err = 0;
if (dev->sd_ctrl & SDSPI_PRESENTN) {
txstr("SDCARD: No card present\n");
dv->d_sector_count = 0;
dv->d_block_size = 0;
sdcard_err = -1;
return dv;
}
//////////////////////////////////////////////////////////////////////
//
// CMD0: Command zero, reset the card interaction
// {{{
// Reset the card by sending a command zero
//
/////////////////
//
//
if (SDDEBUG)
txstr("SDCARD: CMD0 GO_IDLE_STATE\n");
dev->sd_data = 0;
dev->sd_ctrl = SDSPI_GO_IDLE; // CMD zero
SDSPI_WAIT_WHILE_BUSY(dv);
v = dev->sd_ctrl;
if (v & SDSPI_ERROR) {
#ifdef SCOPE
SCOPE->s_ctrl = WBSCOPE_TRIGGER | SCOPEDELAY;
#endif
txstr("No response from card to reset command\n");
#ifdef GPIO_SD_RESET
*_gpio = GPIO_SET(GPIO_SD_RESET);
#endif
sdcard_err |= SDERR_INIT | 0x800;
dv->d_sector_count = 0;
dv->d_block_size = 0;
return dv;
}
if (SDDEBUG) {
txstr("Response: ");
txhex(v);
txstr("\r\n");
}
// }}}
//////////////////////////////////////////////////////////////////////
//
// CMD1 : SEND_OP_COND
// {{{
//
if (0) { // CMD1: SEND_OP_COND
// {{{
//
// ENABLE AT YOUR PERIL!!!
//
// LEXAR's CHIP DOESN'T WORK FOLLOWING A CMD1
//
//
//
// CMD1 : SEND_OP_COND
// send operational conditions (i.e. the voltage we'll be
// operating at)
//
if (SDDEBUG)
txstr("SDCARD: CMD1 SEND_OP_COND\n");
dev->sd_data = 0x40000000; // We support high capacity cards
dev->sd_ctrl = SDSPI_CMD+1;
SDSPI_WAIT_WHILE_BUSY(dv);
if ((v = dev->sd_ctrl)!= 1) {
if (v != 2) {
//
// The SIM returns a 2 for this command
//
txstr("SDCARD: SEND_OP_COND returned ");
txhex(v);
txstr(", not 1\r\n");
// sdcard_err |= SDERR_INIT | 0x400;
}
}
if ((v = dev->sd_data)!= -1) {
txstr("SDCARD: SEND_OP_COND data returned ");
txhex(v);
txstr(", not -1\r\n");
sdcard_err |= SDERR_INIT | 0x800;
#ifdef SCOPE
SCOPE->s_ctrl = WBSCOPE_TRIGGER | SCOPEDELAY;
#endif
dv->d_sector_count = 0;
dv->d_block_size = 0;
return dv;
}
if (SDDEBUG) {
txstr("Response: ");
txhex(dev->sd_ctrl);
txstr("\r\n");
}
// }}}
}
// }}}
//////////////////////////////////////////////////////////////////////
//
// CMD8 : SEND_IF_COND, Send interface condition
// {{{
/////////////////
//
//
if (SDDEBUG)
txstr("SDCARD: CMD8 SEND_IF_COND (3.3v)\n");
dev->sd_data = 0x001a5;
dev->sd_ctrl = (SDSPI_CMD|SDSPI_READREG)+8;
SDSPI_WAIT_WHILE_BUSY(dv);
if ((v = dev->sd_data)!= 0x01a5) {
#ifdef SCOPE
SCOPE->s_ctrl = WBSCOPE_TRIGGER | SCOPEDELAY;
#endif
txstr("SDCARD: SEND_IF_COND status ");
txhex(v);
txstr(", != 0x01a5 as expected\r\n");
sdcard_err |= SDERR_INIT | 0x2000;
dv->d_sector_count = 0;
dv->d_block_size = 0;
return dv;
}
if (SDDEBUG) {
txstr("Response: ");
txhex(dev->sd_ctrl);
txstr(" : ");
txhex(dev->sd_data);
txstr("\r\n");
}
// }}}
//////////////////////////////////////////////////////////////////////
//
// ACMD41: Issue ACMD41 until the card has fully started
// {{{
/////////////////
//
//
{ int dev_busy;
const int MAX_ITERATIONS = 1500;
if (SDDEBUG)
txstr("SDCARD: ACMD41, Wait for startup\n");
int iterations = 0;
do {
// Now we need to issue an ACMD41 until such time as
// the in_idle_state turns to zero
//
// First step, issue the ACMD prefix command
//
dev->sd_data = 0;
dev->sd_ctrl = SDSPI_ACMD; // 0x70 = 'd55 + 'h40
SDSPI_WAIT_WHILE_BUSY(dv);
//
// Send the ACMD41 itself
//
dev->sd_data = 0x40000000; // Support high capacity
dev->sd_ctrl = SDSPI_CMD + 41; // 0x69; // 0x040+41;
SDSPI_WAIT_WHILE_BUSY(dv);
dev_busy = dev->sd_ctrl&1;
iterations++;
if (SDDEBUG && (dev->sd_ctrl == 1))
txstr(".");
} while(dev_busy && (iterations < MAX_ITERATIONS));
if (iterations >= MAX_ITERATIONS)
sdcard_err |= SDERR_INIT | 0x4000;
}
//
// Check the response, to double check things are "working" like they
// should be.
{
unsigned vc, vd;
vc = dev->sd_ctrl;
vd = dev->sd_data;
if (vc != 0)
sdcard_err |= SDERR_INIT | 0x4000;
else if (vd != 0xffffffff)
sdcard_err |= SDERR_INIT | 0x8000;
if (SDDEBUG || sdcard_err & 0xc000) {
txstr("ACMD41 Response: ");
txhex(vc);
txstr(" : ");
txhex(vd);
txstr("\r\nI/O setup: ");
dev->sd_ctrl = SDSPI_READAUX;
vd = dev->sd_data;
txhex(vd);
if (sdcard_err & 0x0c000) {
txstr("\r\nERR: Card still idle\r\n");
// zip_halt();
} else
txstr("\r\n");
}
if (sdcard_err & 0xc000) {
#ifdef SCOPE
SCOPE->s_ctrl = WBSCOPE_TRIGGER | SCOPEDELAY;
#endif
txstr("SDCard Err :");
txhex(sdcard_err);
txstr("\n");
dv->d_sector_count = 0;
dv->d_block_size = 0;
return dv;
}
}
// }}}
//////////////////////////////////////////////////////////////////////
//
// Read the OCR register
// {{{
/////////////////
//
//
sdspi_read_ocr(dv);
// }}}
//////////////////////////////////////////////////////////////////////
//
// Change the clock speed to high speed
// {{{
dev->sd_data = 0x0401; // 16 byte block length, 25MHz clock
// Write config data, read last config data
dev->sd_ctrl = SDSPI_SETAUX;
/*
// Bits
// 19:16 Sector size we can support
// 11: 8 LGBLKLEN
// 3: 0 SDSPI CLK divider
*/
if (sdcard_err != 0) {
txstr("SDCARD: ERR != 0, ERR = ");
txhex(sdcard_err);
txstr("\r\n");
dv->d_sector_count = 0;
dv->d_block_size = 0;
return dv;
}
// }}}
//////////////////////////////////////////////////////////////////////
//
// Read the CSD register
// {{{
/////////////////
//
//
if ((v = sdspi_read_csd(dv)) != 0) {
txstr("SDCARD: READCSD returned ");
txhex(v);
txstr("\r\n");
dv->d_sector_count = 0;
dv->d_block_size = 0;
return dv;
}
if (0x00 == (dv->d_CSD[0] & 0xc0)) {
// {{{
// Standard capacity card, CSD v1
//
unsigned C_SIZE, C_SIZE_MULT, READ_BL_LEN,
BLOCK_LEN, BLOCKNR, SECTOR_SIZE,
WRITE_BL_LEN;