rt-thread/bsp/efm32/drv_sdcard.c

/***************************************************************************//**
 * @file 	drv_sdcard.c
 * @brief 	Memory card driver (SPI mode) of RT-Thread RTOS for using EFM32 
 *  USART module
 * 	COPYRIGHT (C) 2011, RT-Thread Development Team
 * @author 	onelife
 * @version 0.4 beta
 *******************************************************************************
 * @section License
 * The license and distribution terms for this file may be found in the file 
 *  LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
 *******************************************************************************
 * @section Change Logs
 * Date			Author		Notes
 * 2011-05-13	onelife		Initial creation for using EFM32 USART module
 * 2011-07-07	onelife		Modify initialization function to return error code
 ******************************************************************************/

/***************************************************************************//**
 * @addtogroup efm32_dk
 * @{
 ******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "board.h"
#include "drv_usart.h"
#include "drv_sdcard.h"

#if defined(EFM32_USING_SPISD)
#include <dfs_fs.h>

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#ifdef EFM32_SDCARD_DEBUG
#define sdcard_debug(format,args...) 		rt_kprintf(format, ##args)
#else
#define sdcard_debug(format,args...)
#endif

/* Private constants ---------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static struct rt_device 	sd_device;
static struct dfs_partition	sdPart;
static rt_device_t 			spi 			= RT_NULL;
static rt_uint16_t 			sdType;
static rt_bool_t 			sdAutoCs 		= true;
static rt_timer_t 			sdTimer 		= RT_NULL;
static rt_bool_t 			sdInTime 		= true;

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/***************************************************************************//**
 * @brief
 *   Memory device timeout interrupt handler
 *
 * @details
 *
 * @note
 *
 * @param[in] parameter
 *	Parameter
 ******************************************************************************/
static void efm_spiSd_timer(void* parameter)
{
	sdInTime = false;
}

/***************************************************************************//**
 * @brief
 *   Set/Clear chip select
 *
 * @details
 *
 * @note
 *
 * @param[in] enable
 *  Chip select pin setting
 ******************************************************************************/
static void efm_spiSd_cs(rt_uint8_t enable)
{
	if (!sdAutoCs)
	{
		if (enable)
		{
			GPIO_PinOutClear(SD_CS_PORT, SD_CS_PIN);
		}
		else
		{
			GPIO_PinOutSet(SD_CS_PORT, SD_CS_PIN);
		}
	}
}

/***************************************************************************//**
 * @brief
 *   Set operation speed level 
 *
 * @details
 *
 * @note
 *
 * @param[in] level
 *  Set SD speed level 
 ******************************************************************************/
static void efm_spiSd_speed(rt_uint8_t level)
{
	RT_ASSERT(spi != RT_NULL);

	struct efm32_usart_device_t *usart;
	rt_uint32_t baudrate;
	
	usart = (struct efm32_usart_device_t *)(spi->user_data);
	if (level == SD_SPEED_HIGH)
	{
		baudrate = EFM32_SDCLK_HIGH;
	}
	else
	{
		baudrate = EFM32_SDCLK_LOW;
	}
	USART_BaudrateSyncSet(usart->usart_device, 0, baudrate);
}

/***************************************************************************//**
 * @brief
 *   Read raw data from memory device
 *
 * @details
 *
 * @note
 *
 * @param[in] buffer
 *   Poniter to the buffer
 *
 * @param[in] size
 *   Buffer size in byte
 *
 * @return
 *   Number of read bytes
 ******************************************************************************/
static rt_size_t efm_spiSd_read(void *buffer, rt_size_t size)
{
	RT_ASSERT(spi != RT_NULL);

	rt_uint8_t buf_read[5], ret;

	/* Build instruction buffer */
	buf_read[0] = 0x00;
	*(rt_uint8_t **)(&buf_read[1]) = buffer;
	/* Read data */
	efm_spiSd_cs(1);
	if ((ret = spi->read(spi, EFM32_NO_DATA, buf_read, size)) == 0)
	{
		sdcard_debug("SPISD: Read failed!\n");
	}
	efm_spiSd_cs(0);

	return ret;
}

/***************************************************************************//**
 * @brief
 *   Send command to memory device
 *
 * @details
 *
 * @note
 *
 * @param[in] cmd
 *   Command index
 *
 * @param[in] arg
 *   Argument
 *
 * @param[in] trail
 *   Pointer to the buffer to store trailing data
 *
 * @return
 *   Command response
 ******************************************************************************/
static rt_uint16_t efm_spiSd_cmd(
	rt_uint8_t cmd, 
	rt_uint32_t arg, 
	rt_uint8_t *trail)
{
	RT_ASSERT(spi != RT_NULL);

	rt_uint8_t buf_ins[11];
	rt_uint8_t buf_res[32]; 	/* Expect (x+1+4) bytes for CRC, (x+1+19) for CSD/CID */
	rt_uint8_t len_trl, i, j;
	rt_uint16_t ret;
	rt_bool_t skip;

	ret = 0xffff; 
	rt_memset(buf_res, 0xff, sizeof(buf_res));

	sdcard_debug("SPISD: Send command %d(%x)\n", cmd, arg);
	do
	{
		/* Build instruction buffer */
		buf_ins[0] = 6; 							/* Instruction length */
		buf_ins[1] = 0x40 | cmd; 					/* Command index */
		buf_ins[2] = (arg >> 24) & 0x000000ff; 		/* Argument: MSB first */
		buf_ins[3] = (arg >> 16) & 0x000000ff;
		buf_ins[4] = (arg >> 8) & 0x000000ff;
		buf_ins[5] = arg & 0x000000ff;
		if (cmd == CMD0)
		{
			buf_ins[6] = 0x95; 						/* Valid CRC for CMD0(0) */
		}
		else if (cmd == CMD8)
		{
			buf_ins[6] = 0x87; 						/* Valid CRC for CMD8(0x1AA) */
		}
		else if (cmd == CMD58)
		{
			buf_ins[6] = 0x01; 						/* Dummy CRC + Stop */
		}
		else
		{
			buf_ins[6] = 0x01; 						/* Dummy CRC + Stop */
		}
		*(rt_uint8_t **)(&buf_ins[7]) = buf_res; 	/* Pointer to RX buffer */

		/* Set trail length */
		if (cmd == CMD8)
		{
			len_trl = 4;							/* R7 response */
		}
		else if (cmd == CMD9)
		{
			len_trl = SD_BLOCK_SIZE_CSD;
		}
		else if (cmd == CMD10)
		{
			len_trl = SD_BLOCK_SIZE_CID;
		}
		else if (cmd == CMD58)
		{
			len_trl = SD_BLOCK_SIZE_OCR;			/* R3 response */
		}
		else
		{
			len_trl = 0;
		}

		/* Send command and get response */
		efm_spiSd_cs(1);
	 	if (spi->read(spi, EFM32_NO_DATA, buf_ins, sizeof(buf_res)) == 0)
		{
			sdcard_debug("SPISD: Send command failed!\n");
			break;
		}		
		efm_spiSd_cs(0);

		/* Skip a stuff byte when stop reading */
		if (cmd == CMD12)
		{
			skip = true;
		}
		else
		{
			skip = false; 
		}
		/* Find valid response: The response is sent back within command response time 
		    (NCR), 0 to 8 bytes for SDC, 1 to 8 bytes for MMC */
		for (i = 0; i < sizeof(buf_res); i++)
		{
			if (buf_res[i] != 0xff)
			{
				if (skip)
				{
					skip = false;
					sdcard_debug("SPISD: Skip %x (at %d)\n", buf_res[i], i);
					continue;
				}

				if (cmd == ACMD13 & 0x7f)
				{
					ret = (rt_uint16_t)buf_res[i];	/* R2 response */
				}
				else
				{
					ret = (rt_uint8_t)buf_res[i];
				}
				break;
			}
		}
		sdcard_debug("SPISD: Response %x (at %d)\n", ret, i);
		i++;
		/* Copy the trailing data */
		if ((ret != 0xffff) && len_trl && trail)
		{
			if (cmd == CMD9 || cmd == CMD10)
			{
				/* Wait for data block */
				for (; i < sizeof(buf_res); i++)
				{
					if (buf_res[i] == 0xfe)
					{
						break;
					}
				}
				/* Check if valid */
				if (i >= sizeof(buf_res))
				{
					sdcard_debug("SPISD: Token is not found!\n");
					ret = 0xffff;
					break;
				}
				i++;
			}
			/* Copy the data */
			for (j = 0; j < len_trl; j++)
			{
				trail[j] = buf_res[i + j];
			}
		}
	} while(0);

	return ret;
}

/***************************************************************************//**
 * @brief
 *   Read a block of data from memory device. This function is used to handle 
 *  the responses of specified commands (e.g. ACMD13, CMD17 and CMD18)
 *
 * @details
 *
 * @note
 *
 * @param[in] buffer
 *   Poniter to the buffer
 *
 * @param[in] size
 *   Buffer size in byte
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t efm_spiSd_readBlock(void *buffer, rt_size_t size)
{
	RT_ASSERT(spi != RT_NULL);

	rt_uint8_t buf_ins[5];
	rt_uint8_t buf_res[8]; 		/* Expect 2 bytes for CRC */		
	rt_uint8_t i, len_copy;
	rt_bool_t start;

	start = false;
	do
	{
		/* Build instruction buffer */
		buf_ins[0] = 0; 							/* Instruction length */
		*(rt_uint8_t **)(&buf_ins[1]) = buf_res;	/* Pointer to RX buffer */

		while(1) 
		{
			/* Send read command */
			efm_spiSd_cs(1);
			if (spi->read(spi, EFM32_NO_DATA, buf_ins, \
				sizeof(buf_res)) == 0)
			{
				sdcard_debug("SPISD: Get read command response failed!\n");
				break;
			}
			efm_spiSd_cs(0);
			/* Wait for data */
			for (i = 0; i < sizeof(buf_res); i++)
			{
				if (buf_res[i] != 0xff)
				{
					start = true;
					break;
				}
			}
			if (start)
			{
				break;
			}
		};

		/* Ckeck if valid */
		if (!start || (buf_res[i] != 0xfe))
		{
			sdcard_debug("SPISD: Token is invalid! (%x)\n", buf_res[i]);
			break;
		}
		/* Copy data to buffer and read the rest */
		len_copy = sizeof(buf_res) - i - 1;
		rt_memcpy(buffer, &buf_res[i + 1], len_copy);
		sdcard_debug("SPISD: Read block start at %d, copy %d bytes\n", i, \
			len_copy);
	
		/* Build instruction buffer */
		buf_ins[0] = 0; 							/* Instruction length */
		*(rt_uint8_t **)(&buf_ins[1]) = (rt_uint8_t *)buffer + len_copy; 	/* Pointer to RX buffer */

		/* Send read command */
		efm_spiSd_cs(1);
		if (spi->read(spi, EFM32_NO_DATA, buf_ins, size - len_copy) == 0)
		{
			sdcard_debug("SPISD: Read data block failed!\n");
			break;
		}
		*(rt_uint8_t **)(&buf_ins[1]) = buf_res; 	/* Pointer to RX buffer */
		if (spi->read(spi, EFM32_NO_DATA, buf_ins, sizeof(buf_res)) == 0)
		{
			sdcard_debug("SPISD: Read CRC failed!\n");
			break;
		}
		sdcard_debug("SPISD: Read CRC %x %x\n", buf_res[0], buf_res[1]);
		efm_spiSd_cs(0);

		return RT_EOK;
	} while(0);

	sdcard_debug("SPISD: Read block failed!\n");
	return -RT_ERROR;
}

/***************************************************************************//**
 * @brief
 *   Write a block of data to memory device. This function is used to send data 
 *  and control tokens for block write commands (e.g. CMD24 and CMD25) 
 *
 * @details
 *
 * @note
 *
 * @param[in] buffer
 *   Poniter to the buffer
 *
 * @param[in] token
 *   Control token
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t efm_spiSd_writeBlock(void *buffer, rt_uint8_t token)
{
	RT_ASSERT(spi != RT_NULL);

	rt_err_t ret;
	rt_uint8_t buf_ins[11];
	rt_uint8_t buf_res[8]; 		/* Expect a byte for data response */
	rt_uint8_t i;

	ret = RT_ERROR;
	do
	{
		/* Initialize timer */
		sdInTime = true;
		rt_timer_start(sdTimer);
		/* Wait for card ready */
		do
		{
			efm_spiSd_read(buf_res, sizeof(buf_res));
		} while (sdInTime && (buf_res[sizeof(buf_res) - 1] != 0xff));
		if (buf_res[sizeof(buf_res) - 1] != 0xff)
		{
			sdcard_debug("SPISD: Card is busy before writing! (%x)\n", \
				buf_res[sizeof(buf_res) - 1]);
			ret = -RT_EBUSY;
			break;
		}
		rt_timer_stop(sdTimer);

		/* Send token */
		buf_ins[0] = token;
		efm_spiSd_cs(1);
		if (spi->write(spi, EFM32_NO_DATA, buf_ins, 1) == 0)
		{
			sdcard_debug("SPISD: Write token failed!\n");
			break;
		}
		/* Send data */
		if (token != 0xfd)
		{
			if (spi->write(spi, EFM32_NO_DATA, buffer, SD_SECTOR_SIZE) == 0)
			{
				sdcard_debug("SPISD: Write data failed!\n");
				break;
			}

			/* Build instruction buffer */
			buf_ins[0] = 2; 							/* Instruction length */
			buf_ins[1] = 0xff; 							/* CRC (Dummy) */
			buf_ins[2] = 0xff;
			*(rt_uint8_t **)(&buf_ins[3]) = buf_res; 	/* Pointer to RX buffer */
			/* Send CRC and read a byte */
			if (spi->read(spi, EFM32_NO_DATA, buf_ins, sizeof(buf_res)) == 0)
			{
				sdcard_debug("SPISD: Write CRC failed!\n");
				break;
			}
			efm_spiSd_cs(0);

			/* Check if accepted */
			for (i = 0; i < sizeof(buf_res); i++)
			{
				if (buf_res[i] != 0xff)
				{
					buf_res[i] &= 0x1f;
					break;
				}
			}
			if (buf_res[i] != 0x05)
			{
				sdcard_debug("SPISD: Writing is not accepted! (%x at %d)\n", \
					buf_res[i], i);
				break;
			}
		}
		else
		{
			/* Initialize timer */
			sdInTime = true;
			rt_timer_start(sdTimer);
			/* Wait for card ready */
			do
			{
				efm_spiSd_read(buf_res, sizeof(buf_res));
			} while (sdInTime && (buf_res[sizeof(buf_res) - 1] != 0xff));
			if (buf_res[sizeof(buf_res) - 1] != 0xff)
			{
				sdcard_debug("SPISD: Card is busy after writing! (%x)\n", \
					buf_res[sizeof(buf_res) - 1] );
				ret = -RT_EBUSY;
				break;
			}
			rt_timer_stop(sdTimer);
		}

		return RT_EOK;
	} while(0);

	sdcard_debug("SPISD: Write block failed!\n");
	return ret;
}

/***************************************************************************//**
 * @brief
 *   Wrapper function of send command to memory device
 *
 * @details
 *
 * @note
 *
 * @param[in] cmd
 *   Command index
 *
 * @param[in] arg
 *   Argument
 *
 * @param[in] trail
 *   Pointer to the buffer to store trailing data
 *
 * @return
 *   Command response
 ******************************************************************************/
rt_uint16_t efm_spiSd_sendCmd(
	rt_uint8_t cmd, 
	rt_uint32_t arg, 
	rt_uint8_t *trail)
{
	rt_uint16_t ret;

	/* ACMD<n> is the command sequense of CMD55-CMD<n> */
	if (cmd & 0x80)
	{
		cmd &= 0x7f;
		ret = efm_spiSd_cmd(CMD55, 0x00000000, EFM32_NO_POINTER);
		if (ret > 0x01) 
		{
			return ret;
		}
	}

	return efm_spiSd_cmd(cmd, arg, trail);
}

/***************************************************************************//**
 * @brief
 *   Initialize memory card device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t rt_spiSd_init(rt_device_t dev)
{
	RT_ASSERT(spi != RT_NULL);

	rt_uint8_t type, cmd, tril[4];
	rt_uint8_t *buf_res;

	type = 0;
	buf_res = RT_NULL;

	do
	{
		/* Create and setup timer */
		if ((sdTimer = rt_timer_create(
			"sdTimer",
			efm_spiSd_timer,
			RT_NULL,
			SD_WAIT_PERIOD, 
			RT_TIMER_FLAG_ONE_SHOT)) == RT_NULL)
		{
			sdcard_debug("SPISD: Create timer failed!\n");
			break;
		}

		/* Open SPI device */
		if (spi->open(spi, RT_DEVICE_OFLAG_RDWR) != RT_EOK)
		{
			break;
		}

		/* Switch to low speed */
		efm_spiSd_speed(SD_SPEED_LOW);		

		/* 80 dummy clocks */
		efm_spiSd_read(RT_NULL, 80);
		/* Enter Idle state */
		if (efm_spiSd_sendCmd(CMD0, 0x00000000, EFM32_NO_POINTER) != 0x01)
		{
			break;
		}
		/* Check if SDv2 */
		if (efm_spiSd_sendCmd(CMD8, 0x000001AA, tril) == 0x01)
		{
			/* SDv2, Vdd: 2.7-3.6V */
			if (tril[2] == 0x01 && tril[3] == 0xAA) 
			{
				/* Initialize timer */
				sdInTime = true;
				rt_timer_start(sdTimer);
				/* Wait for leaving idle state (ACMD41 with HCS bit) */
				while (efm_spiSd_sendCmd(ACMD41, 0x40000000, EFM32_NO_POINTER) \
					&& sdInTime);
				/* Check CCS bit (bit 30) in the OCR */
				if (sdInTime && efm_spiSd_sendCmd(CMD58, 0x00000000, tril) \
					== 0x00)
				{
					type = (tril[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2;
				}
			}
		}
		else
		{
			if (efm_spiSd_sendCmd(ACMD41, 0x00000000, EFM32_NO_POINTER) <= 0x01)
			{
				/* SDv1 */
				type = CT_SD1;
				cmd = ACMD41;	
			}
			else
			{
				/* MMCv3 */
				type = CT_MMC;
				cmd = CMD1;
			}
			/* Initialize timer */
			sdInTime = true;
			rt_timer_start(sdTimer);
			/* Wait for leaving idle state */
			while (efm_spiSd_sendCmd(cmd, 0x00000000, EFM32_NO_POINTER) && \
				sdInTime);
			/* Set read/write block length to SD_BLOCK_SIZE */
			if (!sdInTime || \
				(efm_spiSd_sendCmd(CMD16, SD_SECTOR_SIZE, EFM32_NO_POINTER) \
				!= 0x00))
			{
				type = 0;
				break;
			}
		}
		rt_timer_stop(sdTimer);

		/* Check type */
		sdType = type;
		if (sdType) 
		{
			/* Initialization succeded */
			efm_spiSd_speed(SD_SPEED_HIGH);
		}
		else
		{
			break;
		}

		/* Allocate buffer */
		if ((buf_res = rt_malloc(SD_SECTOR_SIZE)) == RT_NULL)
		{
			sdcard_debug("SPISD: No memory for sector buffer\n");
			break;
		}
		/* Read the first sector for partition table */
		if (dev->read(dev, 0, buf_res, 1) != 1)
		{
			sdcard_debug("SPISD: Read first sector failed!\n");
			break;
		}
		/* Fetch the partition table */
		if (dfs_filesystem_get_partition(&sdPart, buf_res, 0) != RT_EOK)
		{
			sdPart.offset = 0;
			sdPart.size = 0;
			sdcard_debug("SPISD: No partition table\n");
		}
		/* Release buffer */
		rt_free(buf_res);
		sdcard_debug("SPISD: Init OK, card type %x\n", sdType);
		return RT_EOK;
	} while (0);

	/* Release buffer */
	if (buf_res)
	{
		rt_free(buf_res);
	}	
	efm_spiSd_deinit();
	rt_kprintf("SPISD: Init failed!\n");
	return -RT_ERROR;
}

/***************************************************************************//**
 * @brief
 *   Open memory card device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @param[in] oflag
 *   Device open flag
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t rt_spiSd_open(rt_device_t dev, rt_uint16_t oflag)
{
	sdcard_debug("SPISD: Open, flag %x\n", sd_device.flag);
	return RT_EOK;
}

/***************************************************************************//**
 * @brief
 *   Close memory card device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t rt_spiSd_close(rt_device_t dev)
{
	sdcard_debug("SPISD: Close, flag %x\n", sd_device.flag);
	return RT_EOK;
}

/***************************************************************************//**
 * @brief
 *   Read from memory card device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @param[in] sector
 *   Start sector number (LBA)
 *
 * @param[in] buffer
 *   Pointer to the buffer
 *
 * @param[in] count
 *   Sector count (1..255)
 *
 * @return
 *   Number of read sectors
 ******************************************************************************/
static rt_size_t rt_spiSd_read(
	rt_device_t 	dev, 
	rt_off_t 		sector,
	void 			*buffer,
	rt_size_t 		count)
{
	rt_uint8_t buf_ins[11], buf_res[12];
	rt_uint8_t *ptr;
	rt_uint8_t cmd, i;
	rt_size_t cnt;

	ptr = (rt_uint8_t *)buffer;
	cnt = count;

	sdcard_debug("SPISD: ****** Read Data ******\n");
	if (!(sdType & CT_BLOCK))
	{
		/* Convert to byte address if needed */
		sector *= SD_SECTOR_SIZE;
	}

	do
	{
		if (cnt == 1)
		{
			/* Single block read */
			cmd = CMD17;
			sdcard_debug("SPISD: Read single block\n");
		}
		else
		{
			/* Multiple block read */
			cmd = CMD18;
			sdcard_debug("SPISD: Read multiple blocks\n");
		}

		if (efm_spiSd_sendCmd(cmd, sector, EFM32_NO_POINTER))
		{
			sdcard_debug("SPISD: Read command error!\n");
			break;
		}
	
		/* Read data */
		do
		{
			if (efm_spiSd_readBlock(ptr, SD_SECTOR_SIZE))
			{
				break;
			}
			ptr += SD_SECTOR_SIZE;
		} while(--cnt);

		/* Stop transmission */
		if (cmd == CMD18)
		{
			if (efm_spiSd_sendCmd(CMD12, 0x00000000, EFM32_NO_POINTER))
			{
				break;
			}
		}

		return (count);
	} while(0);

	return (0);
}

/***************************************************************************//**
 * @brief
 *   Write to memory card device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @param[in] sector
 *   Start sector number (LBA)
 *
 * @param[in] buffer
 *   Pointer to the buffer
 *
 * @param[in] count
 *   Sector count (1..255)
 *
 * @return
 *   Number of written sectors
 ******************************************************************************/
static rt_size_t rt_spiSd_write (
	rt_device_t 	dev, 
	rt_off_t 		sector,
	const void 		*buffer,
	rt_size_t 		count)
{
	rt_uint8_t buf_ins[11], buf_res[12];
	rt_uint8_t *ptr;
	rt_uint8_t cmd, token, i;
	rt_size_t cnt;

	ptr = (rt_uint8_t *)buffer;
	cnt = count;

	sdcard_debug("SPISD: ****** Write Data ******\n");
	if (!(sdType & CT_BLOCK))
	{
		/* Convert to byte address if needed */
		sector *= SD_SECTOR_SIZE;
	}

	do
	{
		if (cnt == 1)
		{
			/* Single block write */
			cmd = CMD24;
			token = 0xfe;
			sdcard_debug("SPISD: Write single block\n");
		}
		else
		{
			/* Multiple block write */
			cmd = CMD25;
			token = 0xfc;
			sdcard_debug("SPISD: Write multiple blocks\n");
			if (sdType & CT_SDC) 
			{
				if (efm_spiSd_sendCmd(ACMD23, count, EFM32_NO_POINTER))
				{
					break;
				}
			}
		}

		if (efm_spiSd_sendCmd(cmd, sector, EFM32_NO_POINTER))
		{
			sdcard_debug("SPISD: Write command error!\n");
			break;
		}

		/* Write data */
		do
		{
			if (efm_spiSd_writeBlock(ptr, token))
			{
				break;
			}
			ptr += SD_SECTOR_SIZE;
		} while(--cnt);

		/* Stop transmission token */
		if (efm_spiSd_writeBlock(EFM32_NO_POINTER, 0xfd))
		{
			break;
		}

		return (count);
	} while(0);

	return (0);
}

/***************************************************************************//**
* @brief
*   Configure memory card device
*
* @details
*
* @note
*
* @param[in] dev
*   Pointer to device descriptor
*
* @param[in] ctrl
*   Memory card control command
*
* @param[in] buffer
*   Pointer to the buffer of in/out data
*
* @return
*   Error code
******************************************************************************/
static rt_err_t rt_spiSd_control (
	rt_device_t 	dev, 
	rt_uint8_t 		ctrl, 
	void 			*buffer)
{
	rt_err_t ret;
	rt_uint32_t c_size;
	rt_uint8_t n;
	rt_uint8_t *buf_res;
	
	ret = -RT_ERROR;
	buf_res = RT_NULL;
	switch (ctrl)
	{
	case RT_DEVICE_CTRL_SD_SYNC:
		/* Flush dirty buffer if present */
		efm_spiSd_cs(1);
		efm_spiSd_cs(0);
		ret = RT_EOK;
		break;

	case RT_DEVICE_CTRL_SD_GET_SCOUNT:
		{
			/* Allocate buffer */
			if ((buf_res = rt_malloc(SD_BLOCK_SIZE_CSD)) == RT_NULL)
			{
				sdcard_debug("SPISD: No memory for RX buffer\n");
				break;
			}
			/* Get number of sectors on the disk (32 bits) */
			if (efm_spiSd_sendCmd(CMD9, 0x00000000, buf_res))
			{
				sdcard_debug("SPISD: Get CSD failed!\n");
				break;
			}

			if ((buf_res[0] >> 6) == 0x01)
			{	
				/* SDv2 */
				/* C_SIZE: Bit 48~69 */
				c_size = ((rt_uint32_t)(buf_res[7] & 0x3f) << 16) + \
					((rt_uint32_t)buf_res[8] << 8) + buf_res[9] + 1;
				/* Result = Capacity / Sector Size */
				*(rt_uint32_t *)buffer = (rt_uint32_t)c_size << \
					(19 - SD_SECTOR_SIZE_SHIFT);
			}
			else
			{
				/* SDv1 or MMC */
				/* C_SIZE: Bit 62~73 */
				c_size = ((rt_uint32_t)(buf_res[6] & 0x03) << 10) + \
					((rt_uint16_t)buf_res[7] << 2) + (buf_res[8] >> 6) + 1;
				/* READ_BL_LEN: Bit 80~83, C_SIZE_MULT: Bit 47~49 */
				n = ((buf_res[9] & 0x03) << 1) + ((buf_res[10] & 0x80) >> 7) + \
					2 + (buf_res[5] & 0x0f);
				/* Result = Capacity / Sector Size */
				*(rt_uint32_t *)buffer = (rt_uint32_t)c_size << \
					(n - SD_SECTOR_SIZE_SHIFT);
			}
			ret = RT_EOK;
			break;
		}

	case RT_DEVICE_CTRL_SD_GET_SSIZE:
		/* Get sectors on the disk (16 bits) */
		*(rt_uint16_t *)buffer = SD_SECTOR_SIZE;
		ret = RT_EOK;
		break;

	case RT_DEVICE_CTRL_SD_GET_BSIZE:
		/* Get erase block size in unit of sectors (32 bits) */
		if (sdType & CT_SD2)
		{
			/* Allocate buffer */
			if ((buf_res = rt_malloc(SD_BLOCK_SIZE_SDSTAT)) == RT_NULL)
			{
				sdcard_debug("SPISD: No memory for RX buffer\n");
				break;
			}
			/* SDv2 */
			if (efm_spiSd_sendCmd(ACMD13, 0x00000000, EFM32_NO_POINTER))
			{
				sdcard_debug("SPISD: Get SD status failed!\n");
				break;
			}
			if (efm_spiSd_readBlock(buf_res, SD_BLOCK_SIZE_SDSTAT))
			{
				sdcard_debug("SPISD: Read SD status failed!\n");
				break;
			}
			/* AU_SIZE: Bit 428~431 */
			*(rt_uint32_t *)buffer = 16UL << ((buf_res[10] >> 4) + 9 - \
				SD_SECTOR_SIZE_SHIFT);
		}
		else
		{
			/* Allocate buffer */
			if ((buf_res = rt_malloc(SD_BLOCK_SIZE_CSD)) == RT_NULL)
			{
				sdcard_debug("SPISD: No memory for RX buffer\n");
				break;
			}
			/* SDv1 or MMC */
			if (efm_spiSd_sendCmd(CMD9, 0x00000000, buf_res))
			{
				sdcard_debug("SPISD: Get CSD failed!\n");
				break;
			}

			if (sdType & CT_SD1)
			{
				/* SECTOR_SIZE: Bit 39~45, WRITE_BL_LEN: Bit 22~25 (9, 10 or 11) */
				*(rt_uint32_t *)buffer = (((buf_res[10] & 0x3f) << 1) + \
					((rt_uint32_t)(buf_res[11] & 0x80) >> 7) + 1) << \
					(8 + (buf_res[13] >> 6) - SD_SECTOR_SIZE_SHIFT);
			}
			else
			{
 				/* ERASE_GRP_SIZE: Bit 42~46, ERASE_GRP_MULT: Bit 37~41 */
				*(rt_uint32_t *)buffer = \
					((rt_uint16_t)((buf_res[10] & 0x7c) >> 2) + 1) * \
					(((buf_res[10] & 0x03) << 3) + \
					((buf_res[11] & 0xe0) >> 5) + 1);
			}
		}
		ret = RT_EOK;
		break;

	case RT_DEVICE_CTRL_SD_GET_TYPE:
		/* Get card type flags (1 byte) */
		*(rt_uint8_t *)buffer = sdType;
		ret = RT_EOK;
		break;

	case RT_DEVICE_CTRL_SD_GET_CSD:
		/* Receive CSD as a data block (16 bytes) */
		if (efm_spiSd_sendCmd(CMD9, 0x00000000, buffer))
		{
			sdcard_debug("SPISD: Get CSD failed!\n");
			break;
		}
		ret = RT_EOK;
		break;

	case RT_DEVICE_CTRL_SD_GET_CID:
		/* Receive CID as a data block (16 bytes) */
		if (efm_spiSd_sendCmd(CMD10, 0x00000000, buffer))
		{
			sdcard_debug("SPISD: Get CID failed!\n");
			break;
		}
		ret = RT_EOK;
		break;

	case RT_DEVICE_CTRL_SD_GET_OCR:
		/* Receive OCR as an R3 resp (4 bytes) */
		if (efm_spiSd_sendCmd(CMD58, 0x00000000, buffer))
		{
			sdcard_debug("SPISD: Get OCR failed!\n");
			break;
		}
		ret = RT_EOK;
		break;

	case RT_DEVICE_CTRL_SD_GET_SDSTAT:
		/* Receive SD statsu as a data block (64 bytes) */
		if (efm_spiSd_sendCmd(ACMD13, 0x00000000, buffer))
		{
			sdcard_debug("SPISD: Get SD status failed!\n");
			break;
		}
		if (efm_spiSd_readBlock(buffer, SD_BLOCK_SIZE_SDSTAT))
		{
			sdcard_debug("SPISD: Read SD status failed!\n");
			break;
		}
		ret = RT_EOK;
		break;

	default:
		break;
	}

	if (buf_res)
	{
		rt_free(buf_res);
	}
	return ret;
}

/***************************************************************************//**
* @brief
*	Initialize all memory card related hardware and register the device to 
*  kernel
*
* @details
*
* @note
*
* @return
*	Error code
******************************************************************************/
rt_err_t efm_spiSd_init(void)
{
	struct efm32_usart_device_t *usart;

#if defined(EFM32_G290_DK)
	/* Enable SPI access to MicroSD card */
	DVK_writeRegister(BC_SPI_CFG, 1);
#endif

	do
	{
		/* Find SPI device */
		spi = rt_device_find(SPISD_USING_DEVICE_NAME);
		if (spi == RT_NULL)
		{
			sdcard_debug("SPISD: Can't find device %s!\n", 
				SPISD_USING_DEVICE_NAME);
			break;
		}
		sdcard_debug("SPISD: Find device %s\n", SPISD_USING_DEVICE_NAME);

		/* Config chip slect pin */
		usart = (struct efm32_usart_device_t *)(spi->user_data);
		if (!(usart->state & USART_STATE_AUTOCS))
		{
			GPIO_PinModeSet(SD_CS_PORT, SD_CS_PIN, gpioModePushPull, 1);
			sdAutoCs = false;
		}

		/* Register SPI SD device */
		sd_device.init 		= rt_spiSd_init;
		sd_device.open 		= rt_spiSd_open;
		sd_device.close 	= rt_spiSd_close;
		sd_device.read 		= rt_spiSd_read;
		sd_device.write 	= rt_spiSd_write;
		sd_device.control 	= rt_spiSd_control;
		sd_device.user_data	= RT_NULL;
		rt_device_register(
			&sd_device, 
			SPISD_DEVICE_NAME, 
			RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);

		sdcard_debug("SPISD: HW init OK, card type %x\n", sdType);
		return RT_EOK;
	} while (0);

	/* Release buffer */
	rt_kprintf("SPISD: HW init failed!\n");
	return -RT_ERROR;
}

/***************************************************************************//**
 * @brief
 *   De-initialize memory card device
 *
 * @details
 *
 * @note
 ******************************************************************************/
void efm_spiSd_deinit(void)
{
	/* Close SPI device */
	if (spi != RT_NULL)
	{
		spi->close(spi);
		spi = RT_NULL;
		sdcard_debug("SPISD: Close device %s\n", SPISD_USING_DEVICE_NAME);
	}
	/* Delete timer */
	if (sdTimer != RT_NULL)
	{
		rt_timer_delete(sdTimer);
		sdTimer = RT_NULL;
		sdcard_debug("SPISD: Delete timer\n");
	}

	sdcard_debug("SPISD: Deinit OK\n");
}

/*******************************************************************************
 * 	Export to FINSH
 ******************************************************************************/
#ifdef RT_USING_FINSH
#include <finsh.h>

void list_sd(void)
{
	rt_uint8_t buf_res[16];
	rt_uint32_t capacity, temp32;
	rt_uint16_t temp16;

	rt_kprintf("    SD Card on %s\n", SPISD_USING_DEVICE_NAME);
	rt_kprintf(" ------------------------------\n");
	sd_device.control(&sd_device, RT_DEVICE_CTRL_SD_GET_CID, buf_res);
	rt_kprintf(" Manufacturer ID:\t%x\n", buf_res[0]);
	rt_kprintf(" OEM/Application ID:\t%x%x\n", buf_res[1], buf_res[2]);
	rt_kprintf(" Product revision:\t%x\n", buf_res[8]);
	buf_res[8] = 0;
	rt_kprintf(" Product name:\t\t%s\n", &buf_res[3]);
	rt_kprintf(" Serial number:\t\t%x%x%x%x\n", \
		buf_res[9], buf_res[10], buf_res[11], buf_res[12]);
	rt_kprintf(" Manufacturing date:\t%d.%d\n", \
		2000 + ((buf_res[13] & 0x0F) << 4) + ((buf_res[14] & 0xF0) >> 4), \
		buf_res[14] & 0x0F);
	rt_kprintf(" Card type:\t\t");
	sd_device.control(&sd_device, RT_DEVICE_CTRL_SD_GET_TYPE, buf_res);
	if (buf_res[0] == CT_MMC)
	{
		rt_kprintf("%s\n", "MMC");
	}
	else if (buf_res[0] == CT_SDC)
	{
		rt_kprintf("%s\n", "SDXC");
	}
	else if (buf_res[0] == CT_SD1)
	{
		rt_kprintf("%s\n", "SDSC");
	}
	else if (buf_res[0] == CT_SD2)
	{
		rt_kprintf("%s\n", "SDHC");
	}
	sd_device.control(&sd_device, RT_DEVICE_CTRL_SD_GET_SSIZE, &temp16);
	sd_device.control(&sd_device, RT_DEVICE_CTRL_SD_GET_SCOUNT, &temp32);
	capacity = ((temp32 & 0x0000FFFF) * temp16) >> 16;
	capacity += ((temp32 >> 16) * temp16);
	capacity >>= 4;
	rt_kprintf(" Card capacity:\t\t%dMB\n", capacity);
}
FINSH_FUNCTION_EXPORT(list_sd, list the SD card.)
#endif

#endif /* defined(EFM32_USING_SPISD) */
/***************************************************************************//**
 * @}
 ******************************************************************************/