221 lines
6.3 KiB
C
221 lines
6.3 KiB
C
#include "sdmmc.h"
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/*--------------------------------------------------------------------------
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Module Private Functions
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---------------------------------------------------------------------------*/
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#define INIT_PORT() init_port() /* Initialize MMC control port (CS/CLK/DI:output, DO:input) */
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#define DLY_US(n) dly_us(n) /* Delay n microseconds */
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#define FORWARD(d) forward(d) /* Data in-time processing function (depends on the project) */
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/* Definitions for MMC/SDC command */
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#define CMD0 (0x40+0) /* GO_IDLE_STATE */
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#define CMD1 (0x40+1) /* SEND_OP_COND (MMC) */
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#define ACMD41 (0xC0+41) /* SEND_OP_COND (SDC) */
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#define CMD8 (0x40+8) /* SEND_IF_COND */
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#define CMD16 (0x40+16) /* SET_BLOCKLEN */
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#define CMD17 (0x40+17) /* READ_SINGLE_BLOCK */
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#define CMD24 (0x40+24) /* WRITE_BLOCK */
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#define CMD55 (0x40+55) /* APP_CMD */
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#define CMD58 (0x40+58) /* READ_OCR */
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/* Card type flags (CardType) */
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#define CT_MMC 0x01 /* MMC ver 3 */
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#define CT_SD1 0x02 /* SD ver 1 */
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#define CT_SD2 0x04 /* SD ver 2 */
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#define CT_SDC (CT_SD1|CT_SD2) /* SD */
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#define CT_BLOCK 0x08 /* Block addressing */
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static char CardType; /* 0:MMC, 1:SDv1, 2:SDv2, 3:Block addressing */
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/*-----------------------------------------------------------------------*/
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/* Send a command packet to MMC */
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/*-----------------------------------------------------------------------*/
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static char send_cmd(char cmd, long arg)
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{
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char 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 */
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CS_H(); spi_rx();
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CS_L(); spi_rx();
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/* Send a command packet */
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spi_tx(cmd); /* Start + Command index */
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s((BYTE)(arg >> 24)); /* Argument[31..24] */
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spi_tx((BYTE)(arg >> 16)); /* Argument[23..16] */
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spi_tx((BYTE)(arg >> 8)); /* Argument[15..8] */
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spi_tx((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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spi_tx(n);
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/* Receive a command response */
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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 = spi_rx();
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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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/* Initialize Disk Drive */
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/*-----------------------------------------------------------------------*/
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sdstatus_t sdmmc_init()
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{
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char n, cmd, ty, buf[4];
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uint tmr;
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CS_H();
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spi_skip(10); /* 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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if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2 */
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for (n = 0; n < 4; n++) buf[n] = spi_rx(); /* 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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DLY_US(1000);
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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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for (n = 0; n < 4; n++) buf[n] = spi_rx();
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ty = (buf[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 (HC or SC) */
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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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DLY_US(1000);
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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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release_spi();
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return ty ? 0 : STA_NOINIT;
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}
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/*-----------------------------------------------------------------------*/
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/* Read partial sector */
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/*-----------------------------------------------------------------------*/
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sdresult_t sdmmc_readp(Ptr buf, long sector, uint offset, uint count)
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{
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DRESULT res;
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char d;
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uint bc, tmr;
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if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */
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res = RES_ERROR;
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if (send_cmd(CMD17, sector) == 0) { /* READ_SINGLE_BLOCK */
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tmr = 1000;
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do { /* Wait for data packet in timeout of 100ms */
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DLY_US(100);
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d = spi_rx();
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} while (d == 0xFF && --tmr);
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if (d == 0xFE) { /* A data packet arrived */
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bc = 514 - offset - count;
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/* Skip leading bytes */
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if (offset) spi_skip(offset);
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/* Receive a part of the sector */
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if (buff) { /* Store data to the memory */
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do
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*buff++ = spi_rx();
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while (--count);
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} else { /* Forward data to the outgoing stream */
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do {
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d = spi_rx();
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FORWARD(d);
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} while (--count);
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}
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/* Skip trailing bytes and CRC */
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spi_skip(bc);
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res = RES_OK;
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}
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}
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release_spi();
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return res;
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}
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/*-----------------------------------------------------------------------*/
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/* Write partial sector */
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/*-----------------------------------------------------------------------*/
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sdresult_t sdmmc_writep(const Ptr buf, long sc)
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{
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DRESULT res;
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UINT bc, tmr;
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static UINT wc;
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res = RES_ERROR;
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if (buff) { /* Send data bytes */
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bc = (UINT)sc;
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while (bc && wc) { /* Send data bytes to the card */
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spi_tx(*buff++);
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wc--; bc--;
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}
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res = RES_OK;
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} else {
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if (sc) { /* Initiate sector write transaction */
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if (!(CardType & CT_BLOCK)) sc *= 512; /* Convert to byte address if needed */
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if (send_cmd(CMD24, sc) == 0) { /* WRITE_SINGLE_BLOCK */
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spi_tx(0xFF); spi_tx(0xFE); /* Data block header */
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wc = 512; /* Set byte counter */
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res = RES_OK;
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}
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} else { /* Finalize sector write transaction */
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bc = wc + 2;
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while (bc--) spi_tx(0); /* Fill left bytes and CRC with zeros */
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if ((spi_rx() & 0x1F) == 0x05) { /* Receive data resp and wait for end of write process in timeout of 300ms */
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for (tmr = 10000; spi_rx() != 0xFF && tmr; tmr--) /* Wait for ready (max 1000ms) */
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DLY_US(100);
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if (tmr) res = RES_OK;
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}
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release_spi();
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}
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}
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return res;
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}
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