661 lines
18 KiB
C
661 lines
18 KiB
C
/*------------------------------------------------------------------------/
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/ MMCv3/SDv1/SDv2+ (in SPI mode) control module
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/-------------------------------------------------------------------------/
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/
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/ Copyright (C) 2014, 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 <p24FJ64GA002.h>
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//#include <plib.h>
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#include "DigitalIO.h"
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#include "diskio.h"
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static inline __attribute__((always_inline)) unsigned char SPICalculateBRG(unsigned int pb_clk, unsigned int spi_clk);
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static void set_fast_clk(void);
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static void set_slow_clk(void);
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/* Socket controls (Platform dependent) */
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#define CS_LOW() SD_SPI_CS_PIN = 0 /* MMC CS = L */
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#define CS_HIGH() SD_SPI_CS_PIN = 1 /* MMC CS = H */
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#define MMC_CD (true) /* Card detected (yes:true, no:false, default:true) */
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#define MMC_WP (false) /* Write protected (yes:true, no:false, default:false) */
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/* SPI bit rate controls */
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#define FCLK_SLOW() set_slow_clk() /* Set slow clock for card initialization (100k-400k) */
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#define FCLK_FAST() set_fast_clk() /* Set fast clock for generic read/write */
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/*--------------------------------------------------------------------------
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Module Private Functions
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---------------------------------------------------------------------------*/
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/* Definitions for MMC/SDC command */
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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 (41|0x80) /* 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 ACMD13 (13|0x80) /* 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 (23|0x80) /* 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 CMD41 (41) /* SEND_OP_COND (ACMD) */
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#define CMD55 (55) /* APP_CMD */
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#define CMD58 (58) /* READ_OCR */
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static volatile
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DSTATUS Stat = STA_NOINIT; /* Disk status */
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static volatile
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UINT Timer1, Timer2; /* 1000Hz decrement timer */
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static
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UINT CardType;
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static inline __attribute__((always_inline)) unsigned char SPICalculateBRG(unsigned int pb_clk, unsigned int spi_clk)
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{
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unsigned int brg;
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brg = pb_clk / (2 * spi_clk);
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if(pb_clk % (2 * spi_clk))
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brg++;
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if(brg > 0x100)
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brg = 0x100;
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if(brg)
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brg--;
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return (unsigned char) brg;
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}
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/*-----------------------------------------------------------------------*/
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/* Interface Controls (Platform dependent) */
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/*-----------------------------------------------------------------------*/
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/* When the target system does not support socket power control, there */
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/* is nothing to do in these functions. */
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static void power_on (void)
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{
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SPI2CON = 0;
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SPI2CONbits.MSTEN = 1;
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SPI2CONbits.CKE = 0;
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SPI2CONbits.CKP = 1;
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FCLK_SLOW();
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SPI2CONbits.ON = 1;
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return;
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}
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static void power_off (void)
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{
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SPI2CONbits.ON = 0; /* Disable SPI2 */
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}
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static void set_slow_clk(void)
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{
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unsigned WasON = SPI2CONbits.ON;
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SPI2CONbits.ON = 0;
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SPI2BRG = SPICalculateBRG(80000000,40000);
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SPI2CONbits.ON = WasON;
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}
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static void set_fast_clk(void)
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{
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unsigned WasON = SPI2CONbits.ON;
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SPI2CONbits.ON = 0;
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SPI2BRG = SPICalculateBRG(80000000,20000000);
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SPI2CONbits.ON = WasON;
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}
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/*-----------------------------------------------------------------------*/
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/* SPI Transactions (Platform dependent) */
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/*-----------------------------------------------------------------------*/
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/* Single byte SPI transaction */
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static BYTE xchg_spi (BYTE dat)
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{
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#ifndef USE_PINGUINO
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while( SPI2STATbits.SPITBF == 1 )
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{
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}
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#endif
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// ----------------
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// sending data
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// ----------------
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SPI2BUF = dat;
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while(SPI2STATbits.SPIRBF == 0)
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{
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}
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return (BYTE)SPI2BUF; /* Get received byte */
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}
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/* Multi-byte SPI transaction (transmit) */
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static
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void xmit_spi_multi (
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const BYTE* buff, /* Data to be sent */
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UINT cnt /* Number of bytes to send */
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)
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{
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do {
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SPI2BUF = *buff++; /* Initiate an SPI transaction */
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while (SPI2STATbits.SPIRBF == 0) ; /* Wait for end of the SPI transaction */
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SPI2BUF; /* Discard received byte */
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SPI2BUF = *buff++;
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while (SPI2STATbits.SPIRBF == 0) ;
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SPI2BUF;
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} while (cnt -= 2);
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}
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/* Multi-byte SPI transaction (receive) */
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static
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void rcvr_spi_multi (
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BYTE* buff, /* Buffer to store received data */
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UINT cnt /* Number of bytes to receive */
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)
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{
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do {
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SPI2BUF = 0xFF; /* Initiate an SPI transaction */
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while (SPI2STATbits.SPIRBF == 0) ; /* Wait for end of the SPI transaction */
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*buff++ = SPI2BUF; /* Get received byte */
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SPI2BUF = 0xFF;
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while (SPI2STATbits.SPIRBF == 0) ;
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*buff++ = SPI2BUF;
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} while (cnt -= 2);
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}
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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)
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{
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BYTE d;
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Timer2 = 500; /* Wait for ready in timeout of 500ms */
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do {
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d = xchg_spi(0xFF);
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} while ((d != 0xFF) && Timer2);
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return (d == 0xFF) ? 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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CS_HIGH(); /* Set CS# high */
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xchg_spi(0xFF); /* 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 ready */
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/*-----------------------------------------------------------------------*/
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static
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int select (void) /* 1:Successful, 0:Timeout */
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{
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CS_LOW(); /* Set CS# low */
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xchg_spi(0xFF); /* 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; /* Timeout */
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}
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/*-----------------------------------------------------------------------*/
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/* Receive a data packet from MMC */
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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 (must be multiple of 4) */
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)
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{
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BYTE token;
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Timer1 = 100;
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do { /* Wait for data packet in timeout of 100ms */
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token = xchg_spi(0xFF);
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} while ((token == 0xFF) && Timer1);
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if(token != 0xFE) return 0; /* If not valid data token, retutn with error */
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rcvr_spi_multi(buff, btr); /* Receive the data block into buffer */
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xchg_spi(0xFF); /* Discard CRC */
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xchg_spi(0xFF);
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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 MMC */
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/*-----------------------------------------------------------------------*/
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#if _USE_WRITE
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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 token */
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)
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{
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BYTE resp;
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if (!wait_ready()) return 0;
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xchg_spi(token); /* Xmit a token */
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if (token != 0xFD) { /* Not StopTran token */
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xmit_spi_multi(buff, 512); /* Xmit the data block to the MMC */
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xchg_spi(0xFF); /* CRC (Dummy) */
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xchg_spi(0xFF);
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resp = xchg_spi(0xFF); /* Receive a data response */
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if ((resp & 0x1F) != 0x05) return 0; /* If not accepted, return with error */
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}
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return 1;
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}
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#endif
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/*-----------------------------------------------------------------------*/
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/* Send a command packet to MMC */
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/*-----------------------------------------------------------------------*/
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static
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BYTE send_cmd (
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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, res;
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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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res = send_cmd(CMD55, 0);
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if (res > 1) return res;
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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 command packet */
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xchg_spi(0x40 | cmd); /* Start + Command index */
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xchg_spi((BYTE)(arg >> 24)); /* Argument[31..24] */
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xchg_spi((BYTE)(arg >> 16)); /* Argument[23..16] */
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xchg_spi((BYTE)(arg >> 8)); /* Argument[15..8] */
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xchg_spi((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) + Stop */
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if (cmd == CMD8) n = 0x87; /* Valid CRC for CMD8(0x1AA) + Stop */
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xchg_spi(n);
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/* Receive command response */
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if (cmd == CMD12) xchg_spi(0xFF); /* Skip a stuff byte on stop to read */
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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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res = xchg_spi(0xFF);
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} while ((res & 0x80) && --n);
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return res; /* 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 pdrv /* Physical drive nmuber (0) */
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)
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{
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if (pdrv != 0) return STA_NOINIT; /* Supports only single drive */
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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 pdrv /* Physical drive nmuber (0) */
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)
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{
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BYTE n, cmd, ty, ocr[4];
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if (pdrv != 0) return STA_NOINIT; /* Supports only single drive */
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if (Stat & STA_NODISK) return Stat; /* No card in the socket */
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power_on(); /* Initialize memory card interface */
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FCLK_SLOW();
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for (n = 10; n; n--) xchg_spi(0xFF); /* 80 dummy clocks */
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ty = 0;
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if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
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Timer1 = 1000; /* Initialization timeout of 1000 msec */
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if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */
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for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF); /* Get trailing return value of R7 resp */
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if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
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while (Timer1 && send_cmd(ACMD41, 0x40000000)); /* Wait for leaving idle state (ACMD41 with HCS bit) */
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if (Timer1 && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
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for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF);
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ty = (ocr[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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while (Timer1 && send_cmd(cmd, 0)); /* Wait for leaving idle state */
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if (!Timer1 || send_cmd(CMD16, 512) != 0) ty = 0; /* Set read/write block length to 512 */
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}
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}
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CardType = ty;
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deselect();
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if (ty) { /* Function succeded */
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Stat &= ~STA_NOINIT; /* Clear STA_NOINIT */
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FCLK_FAST();
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} else { /* Function failed */
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power_off(); /* Deinitialize interface */
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}
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return Stat;
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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 pdrv, /* Physical drive nmuber (0) */
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BYTE *buff, /* Pointer to the data buffer to store read data */
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DWORD 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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if (pdrv || !count) return RES_PARERR;
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if (Stat & STA_NOINIT) return RES_NOTRDY;
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if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */
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if (count == 1) { /* Single block read */
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if ((send_cmd(CMD17, sector) == 0) /* READ_SINGLE_BLOCK */
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&& rcvr_datablock(buff, 512)) {
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count = 0;
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}
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}
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else { /* Multiple block read */
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if (send_cmd(CMD18, sector) == 0) { /* READ_MULTIPLE_BLOCK */
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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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send_cmd(CMD12, 0); /* STOP_TRANSMISSION */
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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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/* Write Sector(s) */
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/*-----------------------------------------------------------------------*/
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#if _USE_WRITE
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DRESULT disk_write (
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BYTE pdrv, /* Physical drive nmuber (0) */
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const BYTE *buff, /* Pointer to the data to be written */
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DWORD 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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if (pdrv || !count) return RES_PARERR;
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if (Stat & STA_NOINIT) return RES_NOTRDY;
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if (Stat & STA_PROTECT) return RES_WRPRT;
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if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */
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if (count == 1) { /* Single block write */
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if ((send_cmd(CMD24, sector) == 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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}
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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, sector) == 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)) count = 1; /* STOP_TRAN token */
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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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#endif
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/*-----------------------------------------------------------------------*/
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/* Miscellaneous Functions */
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/*-----------------------------------------------------------------------*/
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#if _USE_IOCTL
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DRESULT disk_ioctl (
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BYTE pdrv, /* Physical drive nmuber (0) */
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BYTE cmd, /* Control code */
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void *buff /* Buffer to send/receive data block */
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)
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{
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DRESULT res;
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BYTE n, csd[16], *ptr = buff;
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DWORD csz;
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if (pdrv) return RES_PARERR;
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if (Stat & STA_NOINIT) return RES_NOTRDY;
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res = RES_ERROR;
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switch (cmd) {
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case CTRL_SYNC : /* Flush write-back cache, Wait for end of internal 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 (WORD) */
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if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
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if ((csd[0] >> 6) == 1) { /* SDv2? */
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csz = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
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*(DWORD*)buff = csz << 10;
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} else { /* SDv1 or MMCv3 */
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n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
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csz = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
|
|
*(DWORD*)buff = csz << (n - 9);
|
|
}
|
|
res = RES_OK;
|
|
}
|
|
break;
|
|
|
|
case GET_BLOCK_SIZE : /* Get erase block size in unit of sectors (DWORD) */
|
|
if (CardType & CT_SD2) { /* SDv2+? */
|
|
if (send_cmd(ACMD13, 0) == 0) { /* Read SD status */
|
|
xchg_spi(0xFF);
|
|
if (rcvr_datablock(csd, 16)) { /* Read partial block */
|
|
for (n = 64 - 16; n; n--) xchg_spi(0xFF); /* Purge trailing data */
|
|
*(DWORD*)buff = 16UL << (csd[10] >> 4);
|
|
res = RES_OK;
|
|
}
|
|
}
|
|
} else { /* SDv1 or MMCv3 */
|
|
if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) { /* Read CSD */
|
|
if (CardType & CT_SD1) { /* SDv1 */
|
|
*(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
|
|
} else { /* MMCv3 */
|
|
*(DWORD*)buff = ((WORD)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1);
|
|
}
|
|
res = RES_OK;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MMC_GET_TYPE : /* Get card type flags (1 byte) */
|
|
*ptr = CardType;
|
|
res = RES_OK;
|
|
break;
|
|
|
|
case MMC_GET_CSD : /* Receive CSD as a data block (16 bytes) */
|
|
if ((send_cmd(CMD9, 0) == 0) /* READ_CSD */
|
|
&& rcvr_datablock(buff, 16))
|
|
res = RES_OK;
|
|
break;
|
|
|
|
case MMC_GET_CID : /* Receive CID as a data block (16 bytes) */
|
|
if ((send_cmd(CMD10, 0) == 0) /* READ_CID */
|
|
&& rcvr_datablock(buff, 16))
|
|
res = RES_OK;
|
|
break;
|
|
|
|
case MMC_GET_OCR : /* Receive OCR as an R3 resp (4 bytes) */
|
|
if (send_cmd(CMD58, 0) == 0) { /* READ_OCR */
|
|
for (n = 0; n < 4; n++)
|
|
*((BYTE*)buff+n) = xchg_spi(0xFF);
|
|
res = RES_OK;
|
|
}
|
|
break;
|
|
|
|
case MMC_GET_SDSTAT : /* Receive SD statsu as a data block (64 bytes) */
|
|
if ((CardType & CT_SD2) && send_cmd(ACMD13, 0) == 0) { /* SD_STATUS */
|
|
xchg_spi(0xFF);
|
|
if (rcvr_datablock(buff, 64)) res = RES_OK;
|
|
}
|
|
break;
|
|
|
|
case CTRL_POWER_OFF : /* Power off */
|
|
power_off();
|
|
Stat |= STA_NOINIT;
|
|
res = RES_OK;
|
|
break;
|
|
|
|
default:
|
|
res = RES_PARERR;
|
|
}
|
|
|
|
deselect();
|
|
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
/* Device Timer Driven Procedure */
|
|
/*-----------------------------------------------------------------------*/
|
|
/* This function must be called by timer interrupt in period of 1ms */
|
|
|
|
void disk_timerproc (void)
|
|
{
|
|
BYTE s;
|
|
UINT n;
|
|
|
|
|
|
n = Timer1; /* 1000Hz decrement timer with zero stopped */
|
|
if (n) Timer1 = --n;
|
|
n = Timer2;
|
|
if (n) Timer2 = --n;
|
|
|
|
|
|
/* Update socket status */
|
|
|
|
s = Stat;
|
|
if (MMC_WP) {
|
|
s |= STA_PROTECT;
|
|
} else {
|
|
s &= ~STA_PROTECT;
|
|
}
|
|
if (MMC_CD) {
|
|
s &= ~STA_NODISK;
|
|
} else {
|
|
s |= (STA_NODISK | STA_NOINIT);
|
|
}
|
|
Stat = s;
|
|
}
|
|
|