software/liblitesdcard: base it on FatFs generic example code + LiteX's SPIMaster specific functions.
This commit is contained in:
Florent Kermarrec
parent
5b908983a2
commit
f972c8e45e
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@ -1,8 +1,20 @@
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// This file is Copyright (c) 2020 Rob Shelton <rob.s.ng15@googlemail.com>
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// This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
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// This file is Copyright (c) 2020 Rob Shelton <rob.s.ng15@googlemail.com>
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// License: BSD
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//
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// SDCard SPI-Mode support for LiteX's SPIMaster.
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// FatFs's generic example adapted for LiteX's SPIMaster.
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/*------------------------------------------------------------------------/
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/ Foolproof MMCv3/SDv1/SDv2 (in SPI mode) control module
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/-------------------------------------------------------------------------/
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/
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/ Copyright (C) 2019, ChaN, all right reserved.
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/
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/ * This software is a free software and there is NO WARRANTY.
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/ * No restriction on use. You can use, modify and redistribute it for
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/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
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/ * Redistributions of source code must retain the above copyright notice.
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/
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/-------------------------------------------------------------------------*/
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#include <stdio.h>
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#include <stdlib.h>
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@ -12,6 +24,8 @@
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#include <generated/mem.h>
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#include <system.h>
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#include "ff.h"
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#include "diskio.h"
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#include "spisdcard.h"
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#ifdef CSR_SPISDCARD_BASE
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@ -53,193 +67,467 @@ static uint8_t spi_xfer(uint8_t byte) {
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return spisdcard_miso_read();
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}
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/* SPI SDCard functions */
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/*--------------------------------------------------------------------------
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Module Private Functions
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---------------------------------------------------------------------------*/
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/* MMC/SD command (SPI mode) */
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#define CMD0 (0) /* GO_IDLE_STATE */
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#define CMD1 (1) /* SEND_OP_COND */
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#define ACMD41 (0x80+41) /* SEND_OP_COND (SDC) */
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#define CMD8 (8) /* SEND_IF_COND */
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#define CMD9 (9) /* SEND_CSD */
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#define CMD10 (10) /* SEND_CID */
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#define CMD12 (12) /* STOP_TRANSMISSION */
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#define CMD13 (13) /* SEND_STATUS */
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#define ACMD13 (0x80+13) /* SD_STATUS (SDC) */
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#define CMD16 (16) /* SET_BLOCKLEN */
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#define CMD17 (17) /* READ_SINGLE_BLOCK */
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#define CMD18 (18) /* READ_MULTIPLE_BLOCK */
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#define CMD23 (23) /* SET_BLOCK_COUNT */
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#define ACMD23 (0x80+23) /* SET_WR_BLK_ERASE_COUNT (SDC) */
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#define CMD24 (24) /* WRITE_BLOCK */
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#define CMD25 (25) /* WRITE_MULTIPLE_BLOCK */
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#define CMD32 (32) /* ERASE_ER_BLK_START */
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#define CMD33 (33) /* ERASE_ER_BLK_END */
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#define CMD38 (38) /* ERASE */
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#define CMD55 (55) /* APP_CMD */
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#define CMD58 (58) /* READ_OCR */
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static
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DSTATUS Stat = STA_NOINIT; /* Disk status */
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static
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BYTE CardType; /* b0:MMC, b1:SDv1, b2:SDv2, b3:Block addressing */
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/*-----------------------------------------------------------------------*/
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/* Transmit bytes to the card */
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/*-----------------------------------------------------------------------*/
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static
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void xmit_mmc (
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const BYTE* buff, /* Data to be sent */
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UINT bc /* Number of bytes to send */
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)
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{
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BYTE d;
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static uint8_t spisdcard_wait_response(void) {
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uint8_t timeout;
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uint8_t response;
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timeout = 32;
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/* Do SPI Xfers on SDCard until MISO MSB's is 0 (valid response) or timeout is expired */
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do {
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response = spi_xfer(0xff);
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timeout--;
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} while(((response & 0x80) !=0) && timeout > 0);
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return response;
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d = *buff++; /* Get a byte to be sent */
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spi_xfer(d);
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} while (--bc);
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}
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static uint8_t spisdcard_set_mode(void) {
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uint8_t timeout;
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uint8_t response;
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timeout = 32;
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/*-----------------------------------------------------------------------*/
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/* Receive bytes from the card */
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/*-----------------------------------------------------------------------*/
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static
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void rcvr_mmc (
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BYTE *buff, /* Pointer to read buffer */
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UINT bc /* Number of bytes to receive */
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)
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{
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BYTE r;
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do {
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int i;
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/* Set CS and send 80 clock pulses to set the SDCard in SPI Mode */
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spisdcard_cs_write(SPI_CS_HIGH);
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for (i=0; i<10; i++)
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spi_xfer(0xff);
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/* Clear CS and read response, if 0 the SDCard has been initialized to SPI Mode */
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spisdcard_cs_write(SPI_CS_LOW);
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response = spisdcard_wait_response();
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r = spi_xfer(0xff);
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*buff++ = r; /* Store a received byte */
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} while (--bc);
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}
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timeout--;
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} while ((timeout > 0) && (response == 0));
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if(timeout == 0)
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/*-----------------------------------------------------------------------*/
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/* Wait for card ready */
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/*-----------------------------------------------------------------------*/
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static
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int wait_ready (void) /* 1:OK, 0:Timeout */
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{
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BYTE d;
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UINT tmr;
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for (tmr = 5000; tmr; tmr--) { /* Wait for ready in timeout of 500ms */
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rcvr_mmc(&d, 1);
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if (d == 0xFF) break;
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}
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return tmr ? 1 : 0;
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}
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/*-----------------------------------------------------------------------*/
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/* Deselect the card and release SPI bus */
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/*-----------------------------------------------------------------------*/
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static
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void deselect (void)
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{
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BYTE d;
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spisdcard_cs_write(SPI_CS_HIGH); /* Set CS# high */
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rcvr_mmc(&d, 1); /* Dummy clock (force DO hi-z for multiple slave SPI) */
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}
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/*-----------------------------------------------------------------------*/
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/* Select the card and wait for ready */
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/*-----------------------------------------------------------------------*/
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static
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int select (void) /* 1:OK, 0:Timeout */
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{
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BYTE d;
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spisdcard_cs_write(SPI_CS_LOW); /* Set CS# high */
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rcvr_mmc(&d, 1); /* Dummy clock (force DO enabled) */
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if (wait_ready()) return 1; /* Wait for card ready */
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deselect();
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return 0; /* Failed */
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}
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/*-----------------------------------------------------------------------*/
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/* Receive a data packet from the card */
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/*-----------------------------------------------------------------------*/
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static
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int rcvr_datablock ( /* 1:OK, 0:Failed */
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BYTE *buff, /* Data buffer to store received data */
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UINT btr /* Byte count */
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)
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{
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BYTE d[2];
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UINT tmr;
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for (tmr = 1000; tmr; tmr--) { /* Wait for data packet in timeout of 100ms */
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rcvr_mmc(d, 1);
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if (d[0] != 0xFF) break;
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}
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if (d[0] != 0xFE) return 0; /* If not valid data token, return with error */
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rcvr_mmc(buff, btr); /* Receive the data block into buffer */
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rcvr_mmc(d, 2); /* Discard CRC */
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return 1; /* Return with success */
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}
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/*-----------------------------------------------------------------------*/
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/* Send a data packet to the card */
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/*-----------------------------------------------------------------------*/
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static
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int xmit_datablock ( /* 1:OK, 0:Failed */
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const BYTE *buff, /* 512 byte data block to be transmitted */
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BYTE token /* Data/Stop token */
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)
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{
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BYTE d[2];
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if (!wait_ready()) return 0;
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d[0] = token;
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xmit_mmc(d, 1); /* Xmit a token */
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if (token != 0xFD) { /* Is it data token? */
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xmit_mmc(buff, 512); /* Xmit the 512 byte data block to MMC */
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rcvr_mmc(d, 2); /* Xmit dummy CRC (0xFF,0xFF) */
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rcvr_mmc(d, 1); /* Receive data response */
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if ((d[0] & 0x1F) != 0x05) /* If not accepted, return with error */
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return 0;
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}
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return 1;
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}
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uint8_t spisdcard_init(void) {
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uint8_t i;
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uint8_t r;
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uint8_t timeout;
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/*-----------------------------------------------------------------------*/
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/* Send a command packet to the card */
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/*-----------------------------------------------------------------------*/
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static
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BYTE send_cmd ( /* Returns command response (bit7==1:Send failed)*/
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BYTE cmd, /* Command byte */
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DWORD arg /* Argument */
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)
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{
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BYTE n, d, buf[6];
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if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
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cmd &= 0x7F;
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n = send_cmd(CMD55, 0);
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if (n > 1) return n;
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}
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/* Select the card and wait for ready except to stop multiple block read */
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if (cmd != CMD12) {
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deselect();
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if (!select()) return 0xFF;
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}
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/* Send a command packet */
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buf[0] = 0x40 | cmd; /* Start + Command index */
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buf[1] = (BYTE)(arg >> 24); /* Argument[31..24] */
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buf[2] = (BYTE)(arg >> 16); /* Argument[23..16] */
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buf[3] = (BYTE)(arg >> 8); /* Argument[15..8] */
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buf[4] = (BYTE)arg; /* Argument[7..0] */
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n = 0x01; /* Dummy CRC + Stop */
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if (cmd == CMD0) n = 0x95; /* (valid CRC for CMD0(0)) */
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if (cmd == CMD8) n = 0x87; /* (valid CRC for CMD8(0x1AA)) */
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buf[5] = n;
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xmit_mmc(buf, 6);
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/* Receive command response */
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if (cmd == CMD12) rcvr_mmc(&d, 1); /* Skip a stuff byte when stop reading */
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n = 10; /* Wait for a valid response in timeout of 10 attempts */
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do
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rcvr_mmc(&d, 1);
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while ((d & 0x80) && --n);
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return d; /* Return with the response value */
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}
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/*--------------------------------------------------------------------------
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Public Functions
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---------------------------------------------------------------------------*/
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/*-----------------------------------------------------------------------*/
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/* Get Disk Status */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_status (
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BYTE drv /* Drive number (always 0) */
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)
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{
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if (drv) return STA_NOINIT;
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return Stat;
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}
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/*-----------------------------------------------------------------------*/
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/* Initialize Disk Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize (
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BYTE drv /* Physical drive nmuber (0) */
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)
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{
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BYTE n, ty, cmd, buf[4];
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UINT tmr;
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DSTATUS s;
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if (drv) return RES_NOTRDY;
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busy_wait(10); /* 10ms */
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for (n = 10; n; n--) rcvr_mmc(buf, 1); /* Apply 80 dummy clocks and the card gets ready to receive command */
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ty = 0;
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if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
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if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */
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rcvr_mmc(buf, 4); /* Get trailing return value of R7 resp */
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if (buf[2] == 0x01 && buf[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
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for (tmr = 1000; tmr; tmr--) { /* Wait for leaving idle state (ACMD41 with HCS bit) */
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if (send_cmd(ACMD41, 1UL << 30) == 0) break;
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busy_wait(1);
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}
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if (tmr && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
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rcvr_mmc(buf, 4);
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ty = (buf[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 */
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}
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}
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} else { /* SDv1 or MMCv3 */
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if (send_cmd(ACMD41, 0) <= 1) {
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ty = CT_SD1; cmd = ACMD41; /* SDv1 */
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} else {
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ty = CT_MMC; cmd = CMD1; /* MMCv3 */
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}
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for (tmr = 1000; tmr; tmr--) { /* Wait for leaving idle state */
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if (send_cmd(cmd, 0) == 0) break;
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busy_wait(1);
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}
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if (!tmr || send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */
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ty = 0;
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}
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}
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CardType = ty;
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s = ty ? 0 : STA_NOINIT;
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Stat = s;
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deselect();
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return s;
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}
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/*-----------------------------------------------------------------------*/
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/* Read Sector(s) */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_read (
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BYTE drv, /* Physical drive nmuber (0) */
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BYTE *buff, /* Pointer to the data buffer to store read data */
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LBA_t sector, /* Start sector number (LBA) */
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UINT count /* Sector count (1..128) */
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)
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{
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BYTE cmd;
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DWORD sect = (DWORD)sector;
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//FIXME if (disk_status(drv) & STA_NOINIT) return RES_NOTRDY;
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if (!(CardType & CT_BLOCK)) sect *= 512; /* Convert LBA to byte address if needed */
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cmd = count > 1 ? CMD18 : CMD17; /* READ_MULTIPLE_BLOCK : READ_SINGLE_BLOCK */
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if (send_cmd(cmd, sect) == 0) {
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do {
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if (!rcvr_datablock(buff, 512)) break;
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buff += 512;
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} while (--count);
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if (cmd == CMD18) send_cmd(CMD12, 0); /* STOP_TRANSMISSION */
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}
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deselect();
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return count ? RES_ERROR : RES_OK;
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}
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/*-----------------------------------------------------------------------*/
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/* Write Sector(s) */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_write (
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BYTE drv, /* Physical drive nmuber (0) */
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const BYTE *buff, /* Pointer to the data to be written */
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LBA_t sector, /* Start sector number (LBA) */
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UINT count /* Sector count (1..128) */
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)
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{
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DWORD sect = (DWORD)sector;
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//FIXME if (disk_status(drv) & STA_NOINIT) return RES_NOTRDY;
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if (!(CardType & CT_BLOCK)) sect *= 512; /* Convert LBA to byte address if needed */
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if (count == 1) { /* Single block write */
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if ((send_cmd(CMD24, sect) == 0) /* WRITE_BLOCK */
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&& xmit_datablock(buff, 0xFE))
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count = 0;
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}
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else { /* Multiple block write */
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if (CardType & CT_SDC) send_cmd(ACMD23, count);
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if (send_cmd(CMD25, sect) == 0) { /* WRITE_MULTIPLE_BLOCK */
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do {
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if (!xmit_datablock(buff, 0xFC)) break;
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buff += 512;
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} while (--count);
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if (!xmit_datablock(0, 0xFD)) /* STOP_TRAN token */
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count = 1;
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}
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}
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deselect();
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return count ? RES_ERROR : RES_OK;
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}
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/*-----------------------------------------------------------------------*/
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/* Miscellaneous Functions */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_ioctl (
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BYTE drv, /* Physical drive nmuber (0) */
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BYTE ctrl, /* Control code */
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void *buff /* Buffer to send/receive control data */
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)
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{
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DRESULT res;
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BYTE n, csd[16];
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DWORD cs;
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//FIXME if (disk_status(drv) & STA_NOINIT) return RES_NOTRDY; /* Check if card is in the socket */
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res = RES_ERROR;
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switch (ctrl) {
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case CTRL_SYNC : /* Make sure that no pending write process */
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if (select()) res = RES_OK;
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break;
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case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */
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if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
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if ((csd[0] >> 6) == 1) { /* SDC ver 2.00 */
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cs = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
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*(LBA_t*)buff = cs << 10;
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} else { /* SDC ver 1.XX or MMC */
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n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
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cs = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
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*(LBA_t*)buff = cs << (n - 9);
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}
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res = RES_OK;
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}
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break;
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case GET_BLOCK_SIZE : /* Get erase block size in unit of sector (DWORD) */
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*(DWORD*)buff = 128;
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res = RES_OK;
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break;
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default:
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res = RES_PARERR;
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}
|
||||
|
||||
deselect();
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
|
||||
/*-----------------------------------------------------------------------*/
|
||||
/* LiteX's BIOS */
|
||||
/*-----------------------------------------------------------------------*/
|
||||
|
||||
uint8_t spisdcard_init(void) {
|
||||
uint8_t r;
|
||||
/* Set SPI clk freq to 400KHz */
|
||||
spi_set_clk_freq(400000);
|
||||
|
||||
/* Set SDCard in SPI Mode */
|
||||
r = spisdcard_set_mode();
|
||||
if(r != 0x01)
|
||||
return 0;
|
||||
/* Initialize the SDCard */
|
||||
r = disk_initialize(0);
|
||||
|
||||
/* Send SD CARD IDLE */
|
||||
/* CMD0 */
|
||||
spi_xfer(0xff);
|
||||
spi_xfer(0x40);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x95);
|
||||
/* R1 response, expects 0x1 */
|
||||
r = spisdcard_wait_response();
|
||||
if(r != 0x01)
|
||||
return 0;
|
||||
|
||||
/* Send Check SD CARD type */
|
||||
/* CMD8 */
|
||||
spi_xfer(0xff);
|
||||
spi_xfer(0x48);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x01);
|
||||
spi_xfer(0xaa);
|
||||
spi_xfer(0x87);
|
||||
/* R7, expects 0x1 */
|
||||
r = spisdcard_wait_response();
|
||||
if(r != 0x01)
|
||||
return 0;
|
||||
/* Reveice the 4 trailing bytes */
|
||||
for(i=0; i<4; i++)
|
||||
r = spi_xfer(0xff); /* FIXME: add check? */
|
||||
|
||||
/* Send Force SD CARD READY (CMD55 + ACMD41), expects 0x00 R1 response */
|
||||
timeout = 32;
|
||||
do {
|
||||
/* CMD55 */
|
||||
spi_xfer(0xff);
|
||||
spi_xfer(0x77);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
r = spisdcard_wait_response();
|
||||
/* ACMD41 */
|
||||
spi_xfer(0xff);
|
||||
spi_xfer(0x69);
|
||||
spi_xfer(0x40);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
/* R1 */
|
||||
r = spisdcard_wait_response();
|
||||
timeout--;
|
||||
/* 20ms delay */
|
||||
busy_wait(20);
|
||||
} while ((r != 0x00) && (timeout > 0));
|
||||
if(r != 0x00)
|
||||
return 0;
|
||||
|
||||
/* Send Read SD CARD OCR (status register) */
|
||||
/* CMD58 */
|
||||
spi_xfer(0xff);
|
||||
spi_xfer(0x7a);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0xff);
|
||||
/* R3, expects 0x1 */
|
||||
r = spisdcard_wait_response();
|
||||
if(r > 0x01)
|
||||
return 0;
|
||||
/* Reveice the 4 trailing bytes */
|
||||
for(i=0; i<4; i++)
|
||||
r = spi_xfer(0xff); /* FIXME: add check? */
|
||||
|
||||
/* Send Set SD CARD block size */
|
||||
/* CMD16 */
|
||||
spi_xfer(0xff);
|
||||
spi_xfer(0x50);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0x02);
|
||||
spi_xfer(0x00);
|
||||
spi_xfer(0xff);
|
||||
/* RI, expects 0x00 */
|
||||
r = spisdcard_wait_response();
|
||||
if(r != 0x00)
|
||||
return 0;
|
||||
|
||||
/* Set SPI clk freq to 16MHz */
|
||||
/* Increase SPI clk freq to 16MHz if successful */
|
||||
if (r == RES_OK) {
|
||||
spi_set_clk_freq(16000000);
|
||||
}
|
||||
|
||||
return 1;
|
||||
return (r == RES_OK);
|
||||
}
|
||||
|
||||
uint8_t spisdcard_read_block(uint32_t addr, uint8_t *buf) {
|
||||
int i;
|
||||
uint32_t timeout;
|
||||
uint8_t r;
|
||||
|
||||
/* Send Read Block */
|
||||
/* CMD17 */
|
||||
spi_xfer(0xff);
|
||||
spi_xfer(0x51);
|
||||
spi_xfer((addr >> 24) & 0xff);
|
||||
spi_xfer((addr >> 16) & 0xff);
|
||||
spi_xfer((addr >> 8) & 0xff);
|
||||
spi_xfer((addr >> 0) & 0xff);
|
||||
spi_xfer(0xff);
|
||||
/* R1, expects 0x00 that indicates the SDCard is processing */
|
||||
r = spisdcard_wait_response();
|
||||
if(r != 0x00)
|
||||
return 0;
|
||||
|
||||
/* Do SPI Xfers on SDCard until 0xfe is received (block start) or timeout is expired */
|
||||
r = spi_xfer(0xff);
|
||||
timeout = 16384;
|
||||
do {
|
||||
r = spi_xfer(0xff);
|
||||
timeout--;
|
||||
} while((r != 0xfe) && (timeout>0));
|
||||
if(r != 0xfe)
|
||||
return 0;
|
||||
|
||||
/* Read the block from the SDCard and copy it to the buffer */
|
||||
for(i=0; i<512; i++)
|
||||
buf[i] = spi_xfer(0xff);
|
||||
|
||||
/* Read the 8 dummy bytes */
|
||||
for(i=0; i<8; i++)
|
||||
r = spi_xfer(0xff);
|
||||
|
||||
return 1;
|
||||
return (disk_read(0, buf, addr, 1) == RES_OK);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue