459 lines
14 KiB
C
459 lines
14 KiB
C
#include <rtthread.h>
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#include <dfs_fs.h>
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#include "spi.h"
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#include "sd.h"
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/* 512 bytes for each sector */
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#define SD_SECTOR_SIZE 512
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/* token for write operation */
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#define TOKEN_SINGLE_BLOCK 0xFE
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#define TOKEN_MULTI_BLOCK 0xFC
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#define TOKEN_STOP_TRAN 0xFD
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/* Local variables */
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static uint8_t CardType;
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static SDCFG SDCfg;
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static struct rt_device sdcard_device;
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static struct dfs_partition part;
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/* Local Function Prototypes */
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static bool LPC17xx_SD_Init (void);
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static uint8_t LPC17xx_SD_SendCmd (uint8_t cmd, uint32_t arg);
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static bool LPC17xx_SD_ReadSector (uint32_t sector, uint8_t *buff, uint32_t count);
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static bool LPC17xx_SD_ReadDataBlock ( uint8_t *buff, uint32_t cnt);
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static bool LPC17xx_SD_WriteSector (uint32_t sector, const uint8_t *buff, uint32_t count);
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static bool LPC17xx_SD_WirteDataBlock (const uint8_t *buff, uint8_t token);
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static bool LPC17xx_SD_ReadCfg (SDCFG *cfg);
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static bool LPC17xx_SD_WaitForReady (void);
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/* wait until the card is not busy */
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static bool LPC17xx_SD_WaitForReady (void)
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{
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uint8_t res;
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/* timeout should be large enough to make sure the write operaion can be completed. */
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uint32_t timeout = 400000;
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LPC17xx_SPI_SendByte(0xFF);
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do {
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res = LPC17xx_SPI_RecvByte();
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} while ((res != 0xFF) && timeout--);
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return (res == 0xFF ? true : false);
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}
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/* Initialize SD/MMC card. */
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static bool LPC17xx_SD_Init (void)
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{
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uint32_t i, timeout;
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uint8_t cmd, ct, ocr[4];
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bool ret = false;
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/* Initialize SPI interface and enable Flash Card SPI mode. */
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LPC17xx_SPI_Init ();
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/* At least 74 clock cycles are required prior to starting bus communication */
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for (i = 0; i < 80; i++) { /* 80 dummy clocks */
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LPC17xx_SPI_SendByte (0xFF);
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}
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ct = CT_NONE;
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if (LPC17xx_SD_SendCmd (GO_IDLE_STATE, 0) == 0x1)
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{
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timeout = 50000;
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if (LPC17xx_SD_SendCmd(CMD8, 0x1AA) == 1) { /* SDHC */
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/* Get trailing return value of R7 resp */
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for (i = 0; i < 4; i++) ocr[i] = LPC17xx_SPI_RecvByte();
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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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/* Wait for leaving idle state (ACMD41 with HCS bit) */
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while (timeout-- && LPC17xx_SD_SendCmd(SD_SEND_OP_COND, 1UL << 30));
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/* Check CCS bit in the OCR */
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if (timeout && LPC17xx_SD_SendCmd(READ_OCR, 0) == 0) {
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for (i = 0; i < 4; i++) ocr[i] = LPC17xx_SPI_RecvByte();
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ct = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2;
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}
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} else { /* SDSC or MMC */
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if (LPC17xx_SD_SendCmd(SD_SEND_OP_COND, 0) <= 1) {
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ct = CT_SD1; cmd = SD_SEND_OP_COND; /* SDSC */
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} else {
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ct = CT_MMC; cmd = SEND_OP_COND; /* MMC */
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}
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/* Wait for leaving idle state */
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while (timeout-- && LPC17xx_SD_SendCmd(cmd, 0));
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/* Set R/W block length to 512 */
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if (!timeout || LPC17xx_SD_SendCmd(SET_BLOCKLEN, SD_SECTOR_SIZE) != 0)
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ct = CT_NONE;
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}
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}
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else { /* SDSC or MMC */
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if (LPC17xx_SD_SendCmd(SD_SEND_OP_COND, 0) <= 1) {
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ct = CT_SD1; cmd = SD_SEND_OP_COND; /* SDSC */
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} else {
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ct = CT_MMC; cmd = SEND_OP_COND; /* MMC */
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}
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/* Wait for leaving idle state */
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while (timeout-- && LPC17xx_SD_SendCmd(cmd, 0));
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/* Set R/W block length to 512 */
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if (!timeout || LPC17xx_SD_SendCmd(SET_BLOCKLEN, SD_SECTOR_SIZE) != 0)
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ct = CT_NONE;
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}
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}
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CardType = ct;
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LPC17xx_SPI_Release();
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if (ct) { /* Initialization succeeded */
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ret = true;
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if ( ct == CT_MMC ) {
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LPC17xx_SPI_SetSpeed(SPI_SPEED_20MHz);
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} else {
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LPC17xx_SPI_SetSpeed(SPI_SPEED_20MHz);
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}
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} else { /* Initialization failed */
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LPC17xx_SPI_Select ();
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LPC17xx_SD_WaitForReady ();
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LPC17xx_SPI_DeInit();
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}
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return ret;
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}
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/*****************************************************************************
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Send a Command to Flash card and get a Response
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cmd: cmd index
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arg: argument for the cmd
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return the received response of the commond
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*****************************************************************************/
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static uint8_t LPC17xx_SD_SendCmd (uint8_t cmd, uint32_t arg)
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{
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uint32_t r1, n;
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if (cmd & 0x80) { /* ACMD<n> is the command sequence of CMD55-CMD<n> */
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cmd &= 0x7F;
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r1 = LPC17xx_SD_SendCmd(APP_CMD, 0); /* CMD55 */
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if (r1 > 1) return r1; /* cmd send failed */
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}
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/* Select the card and wait for ready */
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LPC17xx_SPI_DeSelect();
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LPC17xx_SPI_Select();
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if (LPC17xx_SD_WaitForReady() == false ) return 0xFF;
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LPC17xx_SPI_SendByte (0xFF); /* prepare 8 clocks */
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LPC17xx_SPI_SendByte (cmd);
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LPC17xx_SPI_SendByte (arg >> 24);
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LPC17xx_SPI_SendByte (arg >> 16);
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LPC17xx_SPI_SendByte (arg >> 8);
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LPC17xx_SPI_SendByte (arg);
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/* Checksum, should only be valid for the first command.CMD0 */
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n = 0x01; /* Dummy CRC + Stop */
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if (cmd == GO_IDLE_STATE) 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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LPC17xx_SPI_SendByte(n);
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if (cmd == STOP_TRAN) LPC17xx_SPI_RecvByte (); /* 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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r1 = LPC17xx_SPI_RecvByte ();
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} while ((r1 & 0x80) && --n);
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return (r1); /* Return with the response value */
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}
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/*****************************************************************************
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Read "count" Sector(s) starting from sector index "sector",
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buff <- [sector, sector+1, ... sector+count-1]
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if success, return true, otherwise return false
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*****************************************************************************/
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static bool LPC17xx_SD_ReadSector (uint32_t sector, uint8_t *buff, uint32_t count)
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{
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/* Convert to byte address if needed */
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if (!(CardType & CT_BLOCK)) sector *= SD_SECTOR_SIZE;
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if (count == 1) { /* Single block read */
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if ((LPC17xx_SD_SendCmd(READ_BLOCK, sector) == 0)
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&& LPC17xx_SD_ReadDataBlock(buff, SD_SECTOR_SIZE))
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count = 0;
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} else { /* Multiple block read */
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if (LPC17xx_SD_SendCmd(READ_MULT_BLOCK, sector) == 0) {
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do {
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if (!LPC17xx_SD_ReadDataBlock(buff, SD_SECTOR_SIZE)) break;
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buff += SD_SECTOR_SIZE;
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} while (--count);
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LPC17xx_SD_SendCmd(STOP_TRAN, 0); /* STOP_TRANSMISSION */
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}
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}
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LPC17xx_SPI_Release();
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return count ? false : true;
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}
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/*****************************************************************************
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read specified number of data to specified buffer.
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buff: Data buffer to store received data
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cnt: Byte count (must be multiple of 4, normally 512)
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*****************************************************************************/
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static bool LPC17xx_SD_ReadDataBlock ( uint8_t *buff, uint32_t cnt)
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{
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uint8_t token;
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uint32_t timeout;
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timeout = 20000;
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do { /* Wait for data packet in timeout of 100ms */
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token = LPC17xx_SPI_RecvByte();
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} while ((token == 0xFF) && timeout--);
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if(token != 0xFE) return false; /* If not valid data token, return with error */
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#if USE_FIFO
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LPC17xx_SPI_RecvBlock_FIFO (buff, cnt);
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#else
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do { /* Receive the data block into buffer */
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*buff++ = LPC17xx_SPI_RecvByte ();
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*buff++ = LPC17xx_SPI_RecvByte ();
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*buff++ = LPC17xx_SPI_RecvByte ();
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*buff++ = LPC17xx_SPI_RecvByte ();
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} while (cnt -= 4);
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#endif /* USE_FIFO */
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LPC17xx_SPI_RecvByte (); /* Discard CRC */
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LPC17xx_SPI_RecvByte ();
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return true; /* Return with success */
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}
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/*****************************************************************************
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Write "count" Sector(s) starting from sector index "sector",
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buff -> [sector, sector+1, ... sector+count-1]
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if success, return true, otherwise return false
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*****************************************************************************/
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static bool LPC17xx_SD_WriteSector (uint32_t sector, const uint8_t *buff, uint32_t count)
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{
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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 ((LPC17xx_SD_SendCmd(WRITE_BLOCK, sector) == 0)
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&& LPC17xx_SD_WirteDataBlock(buff, TOKEN_SINGLE_BLOCK))
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count = 0;
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} else { /* Multiple block write */
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if (CardType & CT_SDC) LPC17xx_SD_SendCmd(SET_WR_BLK_ERASE_COUNT, count);
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if (LPC17xx_SD_SendCmd(WRITE_MULT_BLOCK, sector) == 0) {
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do {
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if (!LPC17xx_SD_WirteDataBlock(buff, TOKEN_MULTI_BLOCK)) break;
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buff += 512;
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} while (--count);
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#if 1
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if (!LPC17xx_SD_WirteDataBlock(0, TOKEN_STOP_TRAN)) /* STOP_TRAN token */
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count = 1;
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#else
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LPC17xx_SPI_SendByte(TOKEN_STOP_TRAN);
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#endif
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}
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}
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LPC17xx_SPI_Release();
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return count ? false : true;
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}
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/*****************************************************************************
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Write 512 bytes
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buffer: 512 byte data block to be transmitted
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token: 0xFE -> single block
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0xFC -> multi block
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0xFD -> Stop
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*****************************************************************************/
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static bool LPC17xx_SD_WirteDataBlock (const uint8_t *buff, uint8_t token)
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{
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uint8_t resp, i;
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i = i; // avoid warning
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LPC17xx_SPI_SendByte (token); /* send data token first*/
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if (token != TOKEN_STOP_TRAN) {
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#if USE_FIFO
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LPC17xx_SPI_SendBlock_FIFO (buff);
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#else
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/* Send data. */
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for (i = 512/4; i ; i--) {
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LPC17xx_SPI_SendByte (*buff++);
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LPC17xx_SPI_SendByte (*buff++);
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LPC17xx_SPI_SendByte (*buff++);
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LPC17xx_SPI_SendByte (*buff++);
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}
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#endif /* USE_FIFO */
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LPC17xx_SPI_SendByte(0xFF); /* 16-bit CRC (Dummy) */
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LPC17xx_SPI_SendByte(0xFF);
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resp = LPC17xx_SPI_RecvByte(); /* Receive data response */
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if ((resp & 0x1F) != 0x05) /* If not accepted, return with error */
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return false;
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if ( LPC17xx_SD_WaitForReady() == false) /* Wait while Flash Card is busy. */
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return false;
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}
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return true;
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}
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/* Read MMC/SD Card device configuration. */
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static bool LPC17xx_SD_ReadCfg (SDCFG *cfg)
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{
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uint8_t i;
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uint16_t csize;
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uint8_t n, csd[16];
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bool retv = false;
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/* Read the OCR - Operations Condition Register. */
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if (LPC17xx_SD_SendCmd (READ_OCR, 0) != 0x00) goto x;
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for (i = 0; i < 4; i++) cfg->ocr[i] = LPC17xx_SPI_RecvByte ();
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/* Read the CID - Card Identification. */
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if ((LPC17xx_SD_SendCmd (SEND_CID, 0) != 0x00) ||
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(LPC17xx_SD_ReadDataBlock (cfg->cid, 16) == false))
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goto x;
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/* Read the CSD - Card Specific Data. */
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if ((LPC17xx_SD_SendCmd (SEND_CSD, 0) != 0x00) ||
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(LPC17xx_SD_ReadDataBlock (cfg->csd, 16) == false))
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goto x;
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cfg -> sectorsize = SD_SECTOR_SIZE;
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/* Get number of sectors on the disk (DWORD) */
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if ((cfg->csd[0] >> 6) == 1) { /* SDC ver 2.00 */
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csize = cfg->csd[9] + ((uint16_t)cfg->csd[8] << 8) + 1;
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cfg -> sectorcnt = (uint32_t)csize << 10;
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} else { /* SDC ver 1.XX or MMC*/
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n = (cfg->csd[5] & 15) + ((cfg->csd[10] & 128) >> 7) + ((cfg->csd[9] & 3) << 1) + 2; // 19
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csize = (cfg->csd[8] >> 6) + ((uint16_t)cfg->csd[7] << 2) + ((uint16_t)(cfg->csd[6] & 3) << 10) + 1; // 3752
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cfg -> sectorcnt = (uint32_t)csize << (n - 9); // 3842048
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}
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cfg->size = cfg -> sectorcnt * cfg -> sectorsize; // 512*3842048=1967128576Byte (1.83GB)
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/* Get erase block size in unit of sector (DWORD) */
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if (CardType & CT_SD2) { /* SDC ver 2.00 */
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if (LPC17xx_SD_SendCmd(SD_STATUS /*ACMD13*/, 0) == 0) { /* Read SD status */
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LPC17xx_SPI_RecvByte();
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if (LPC17xx_SD_ReadDataBlock(csd, 16)) { /* Read partial block */
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for (n = 64 - 16; n; n--) LPC17xx_SPI_RecvByte(); /* Purge trailing data */
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cfg->blocksize = 16UL << (csd[10] >> 4);
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retv = true;
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}
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}
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} else { /* SDC ver 1.XX or MMC */
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if ((LPC17xx_SD_SendCmd(SEND_CSD, 0) == 0) && LPC17xx_SD_ReadDataBlock(csd, 16)) { /* Read CSD */
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if (CardType & CT_SD1) { /* SDC ver 1.XX */
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cfg->blocksize = (((csd[10] & 63) << 1) + ((uint16_t)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
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} else { /* MMC */
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// cfg->blocksize = ((uint16_t)((buf[10] & 124) >> 2) + 1) * (((buf[11] & 3) << 3) + ((buf[11] & 224) >> 5) + 1);
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cfg->blocksize = ((uint16_t)((cfg->csd[10] & 124) >> 2) + 1) * (((cfg->csd[10] & 3) << 3) + ((cfg->csd[11] & 224) >> 5) + 1);
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}
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retv = true;
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}
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}
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x: LPC17xx_SPI_Release();
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return (retv);
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}
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static rt_err_t rt_sdcard_init(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_err_t rt_sdcard_open(rt_device_t dev, rt_uint16_t oflag)
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{
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return RT_EOK;
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}
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static rt_err_t rt_sdcard_close(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_size_t rt_sdcard_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
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{
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bool status;
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status = LPC17xx_SD_ReadSector(part.offset + pos, buffer, size);
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if (status == true) return size;
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rt_kprintf("read failed: %d, pos 0x%08x, size %d\n", status, pos, size);
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return 0;
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}
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static rt_size_t rt_sdcard_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
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{
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bool status;
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status = LPC17xx_SD_WriteSector(part.offset + pos, buffer, size);
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if (status == true) return size;
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rt_kprintf("write failed: %d, pos 0x%08x, size %d\n", status, pos, size);
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return 0;
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}
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static rt_err_t rt_sdcard_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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return RT_EOK;
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}
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void rt_hw_sdcard_init()
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{
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if (LPC17xx_SD_Init() && LPC17xx_SD_ReadCfg(&SDCfg))
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{
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bool status;
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rt_uint8_t *sector;
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/* get the first sector to read partition table */
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sector = (rt_uint8_t*) rt_malloc (512);
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if (sector == RT_NULL)
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{
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rt_kprintf("allocate partition sector buffer failed\n");
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return;
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}
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status = LPC17xx_SD_ReadSector(0, sector, 1);
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if (status == true)
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{
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/* get the first partition */
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if (dfs_filesystem_get_partition(&part, sector, 0) != 0)
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{
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/* there is no partition */
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part.offset = 0;
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part.size = 0;
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}
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}
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else
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{
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/* there is no partition table */
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part.offset = 0;
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part.size = 0;
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}
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/* release sector buffer */
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rt_free(sector);
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/* register sdcard device */
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sdcard_device.type = RT_Device_Class_Block;
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sdcard_device.init = rt_sdcard_init;
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sdcard_device.open = rt_sdcard_open;
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sdcard_device.close = rt_sdcard_close;
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sdcard_device.read = rt_sdcard_read;
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sdcard_device.write = rt_sdcard_write;
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sdcard_device.control = rt_sdcard_control;
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/* no private */
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sdcard_device.user_data = &SDCfg;
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rt_device_register(&sdcard_device, "sd0",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
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return;
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}
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rt_kprintf("sdcard init failed\n");
|
|
}
|