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SDCard - Basic functionality.

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Detect card, query capacity, read data.
This commit is contained in:
Dominic Clifton 2015-08-26 01:26:26 +01:00 • committed by borisbstyle
parent b1ba72c162
commit 4b955f09da
7 changed files with 1481 additions and 0 deletions
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src/main/drivers/sdcard.c Normal file
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/*
* This file is part of Cleanflight.
*
* Cleanflight is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Cleanflight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Cleanflight. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "drivers/gpio.h"
#include "drivers/sdcard.h"
void SD_Detect_LowLevel_DeInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure SD_SPI_INSTANCE_DETECT_PIN pin: SD Card detect pin */
GPIO_InitStructure.GPIO_Pin = SD_DETECT_PIN;
GPIO_Init(SD_DETECT_GPIO_PORT, &GPIO_InitStructure);
}
void SD_Detect_LowLevel_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure SD_SPI_INSTANCE_DETECT_PIN pin: SD Card detect pin */
GPIO_InitStructure.GPIO_Pin = SD_DETECT_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(SD_DETECT_GPIO_PORT, &GPIO_InitStructure);
}
/**
* @brief DeInitializes the SD/SD communication.
* @param None
* @retval None
*/
void SD_DeInit(void)
{
//SD_LowLevel_DeInit();
}
/**
* @brief Initializes the SD/SD communication.
* @param None
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_Init(void)
{
uint32_t i = 0;
/*!< Initialize SD_SPI_INSTANCE */
//SD_LowLevel_Init();
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte 0xFF, 10 times with CS high */
/*!< Rise CS and MOSI for 80 clocks cycles */
for (i = 0; i <= 9; i++)
{
/*!< Send dummy byte 0xFF */
SD_WriteByte(SD_DUMMY_BYTE);
}
/*------------Put SD in SPI mode--------------*/
/*!< SD initialized and set to SPI mode properly */
return (SD_GoIdleState());
}
/**
* @brief Detect if SD card is correctly plugged in the memory slot.
* @param None
* @retval Return if SD is detected or not
*/
uint8_t SD_Detect(void)
{
__IO uint8_t status = SD_NOT_PRESENT;
/*!< Check GPIO to detect SD */
if (GPIO_ReadInputData(SD_DETECT_GPIO_PORT) & SD_DETECT_PIN)
{
status = SD_PRESENT;
}
return status;
}
/**
* @brief Returns information about specific card.
* @param cardinfo: pointer to a SD_CardInfo structure that contains all SD
* card information.
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_GetCardInfo(SD_CardInfo *cardinfo)
{
SD_Error status = SD_RESPONSE_FAILURE;
SD_GetCSDRegister(&(cardinfo->SD_csd));
status = SD_GetCIDRegister(&(cardinfo->SD_cid));
cardinfo->CardCapacity = (cardinfo->SD_csd.DeviceSize + 1) ;
cardinfo->CardCapacity *= (1 << (cardinfo->SD_csd.DeviceSizeMul + 2));
cardinfo->CardBlockSize = 1 << (cardinfo->SD_csd.RdBlockLen);
cardinfo->CardCapacity *= cardinfo->CardBlockSize;
/*!< Returns the reponse */
return status;
}
/**
* @brief Reads a block of data from the SD.
* @param pBuffer: pointer to the buffer that receives the data read from the
* SD.
* @param ReadAddr: SD's internal address to read from.
* @param BlockSize: the SD card Data block size.
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_ReadBlock(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t BlockSize)
{
uint32_t i = 0;
SD_Error rvalue = SD_RESPONSE_FAILURE;
/*!< SD chip select low */
SD_CS_LOW();
/*!< Send CMD17 (SD_CMD_READ_SINGLE_BLOCK) to read one block */
SD_SendCmd(SD_CMD_READ_SINGLE_BLOCK, ReadAddr, 0xFF);
/*!< Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
{
/*!< Now look for the data token to signify the start of the data */
if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
{
/*!< Read the SD block data : read NumByteToRead data */
for (i = 0; i < BlockSize; i++)
{
/*!< Save the received data */
*pBuffer = SD_ReadByte();
/*!< Point to the next location where the byte read will be saved */
pBuffer++;
}
/*!< Get CRC bytes (not really needed by us, but required by SD) */
SD_ReadByte();
SD_ReadByte();
/*!< Set response value to success */
rvalue = SD_RESPONSE_NO_ERROR;
}
}
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte: 8 Clock pulses of delay */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Returns the reponse */
return rvalue;
}
/**
* @brief Reads multiple block of data from the SD.
* @param pBuffer: pointer to the buffer that receives the data read from the
* SD.
* @param ReadAddr: SD's internal address to read from.
* @param BlockSize: the SD card Data block size.
* @param NumberOfBlocks: number of blocks to be read.
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_ReadMultiBlocks(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
uint32_t i = 0, Offset = 0;
SD_Error rvalue = SD_RESPONSE_FAILURE;
/*!< SD chip select low */
SD_CS_LOW();
/*!< Data transfer */
while (NumberOfBlocks--)
{
/*!< Send CMD17 (SD_CMD_READ_SINGLE_BLOCK) to read one block */
SD_SendCmd (SD_CMD_READ_SINGLE_BLOCK, ReadAddr + Offset, 0xFF);
/*!< Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
if (SD_GetResponse(SD_RESPONSE_NO_ERROR))
{
return SD_RESPONSE_FAILURE;
}
/*!< Now look for the data token to signify the start of the data */
if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
{
/*!< Read the SD block data : read NumByteToRead data */
for (i = 0; i < BlockSize; i++)
{
/*!< Read the pointed data */
*pBuffer = SD_ReadByte();
/*!< Point to the next location where the byte read will be saved */
pBuffer++;
}
/*!< Set next read address*/
Offset += 512;
/*!< get CRC bytes (not really needed by us, but required by SD) */
SD_ReadByte();
SD_ReadByte();
/*!< Set response value to success */
rvalue = SD_RESPONSE_NO_ERROR;
}
else
{
/*!< Set response value to failure */
rvalue = SD_RESPONSE_FAILURE;
}
}
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte: 8 Clock pulses of delay */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Returns the reponse */
return rvalue;
}
/**
* @brief Writes a block on the SD
* @param pBuffer: pointer to the buffer containing the data to be written on
* the SD.
* @param WriteAddr: address to write on.
* @param BlockSize: the SD card Data block size.
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_WriteBlock(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t BlockSize)
{
uint32_t i = 0;
SD_Error rvalue = SD_RESPONSE_FAILURE;
/*!< SD chip select low */
SD_CS_LOW();
/*!< Send CMD24 (SD_CMD_WRITE_SINGLE_BLOCK) to write multiple block */
SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, WriteAddr, 0xFF);
/*!< Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
{
/*!< Send a dummy byte */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Send the data token to signify the start of the data */
SD_WriteByte(0xFE);
/*!< Write the block data to SD : write count data by block */
for (i = 0; i < BlockSize; i++)
{
/*!< Send the pointed byte */
SD_WriteByte(*pBuffer);
/*!< Point to the next location where the byte read will be saved */
pBuffer++;
}
/*!< Put CRC bytes (not really needed by us, but required by SD) */
SD_ReadByte();
SD_ReadByte();
/*!< Read data response */
if (SD_GetDataResponse() == SD_DATA_OK)
{
rvalue = SD_RESPONSE_NO_ERROR;
}
}
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte: 8 Clock pulses of delay */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Returns the reponse */
return rvalue;
}
/**
* @brief Writes many blocks on the SD
* @param pBuffer: pointer to the buffer containing the data to be written on
* the SD.
* @param WriteAddr: address to write on.
* @param BlockSize: the SD card Data block size.
* @param NumberOfBlocks: number of blocks to be written.
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_WriteMultiBlocks(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
uint32_t i = 0, Offset = 0;
SD_Error rvalue = SD_RESPONSE_FAILURE;
/*!< SD chip select low */
SD_CS_LOW();
/*!< Data transfer */
while (NumberOfBlocks--)
{
/*!< Send CMD24 (SD_CMD_WRITE_SINGLE_BLOCK) to write blocks */
SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, WriteAddr + Offset, 0xFF);
/*!< Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
if (SD_GetResponse(SD_RESPONSE_NO_ERROR))
{
return SD_RESPONSE_FAILURE;
}
/*!< Send dummy byte */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Send the data token to signify the start of the data */
SD_WriteByte(SD_START_DATA_SINGLE_BLOCK_WRITE);
/*!< Write the block data to SD : write count data by block */
for (i = 0; i < BlockSize; i++)
{
/*!< Send the pointed byte */
SD_WriteByte(*pBuffer);
/*!< Point to the next location where the byte read will be saved */
pBuffer++;
}
/*!< Set next write address */
Offset += 512;
/*!< Put CRC bytes (not really needed by us, but required by SD) */
SD_ReadByte();
SD_ReadByte();
/*!< Read data response */
if (SD_GetDataResponse() == SD_DATA_OK)
{
/*!< Set response value to success */
rvalue = SD_RESPONSE_NO_ERROR;
}
else
{
/*!< Set response value to failure */
rvalue = SD_RESPONSE_FAILURE;
}
}
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte: 8 Clock pulses of delay */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Returns the reponse */
return rvalue;
}
/**
* @brief Read the CSD card register.
* Reading the contents of the CSD register in SPI mode is a simple
* read-block transaction.
* @param SD_csd: pointer on an SCD register structure
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_GetCSDRegister(SD_CSD* SD_csd)
{
uint32_t i = 0;
SD_Error rvalue = SD_RESPONSE_FAILURE;
uint8_t CSD_Tab[16];
/*!< SD chip select low */
SD_CS_LOW();
/*!< Send CMD9 (CSD register) or CMD10(CSD register) */
SD_SendCmd(SD_CMD_SEND_CSD, 0, 0xFF);
/*!< Wait for response in the R1 format (0x00 is no errors) */
if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
{
if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
{
for (i = 0; i < 16; i++)
{
/*!< Store CSD register value on CSD_Tab */
CSD_Tab[i] = SD_ReadByte();
}
}
/*!< Get CRC bytes (not really needed by us, but required by SD) */
SD_WriteByte(SD_DUMMY_BYTE);
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Set response value to success */
rvalue = SD_RESPONSE_NO_ERROR;
}
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte: 8 Clock pulses of delay */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Byte 0 */
SD_csd->CSDStruct = (CSD_Tab[0] & 0xC0) >> 6;
SD_csd->SysSpecVersion = (CSD_Tab[0] & 0x3C) >> 2;
SD_csd->Reserved1 = CSD_Tab[0] & 0x03;
/*!< Byte 1 */
SD_csd->TAAC = CSD_Tab[1];
/*!< Byte 2 */
SD_csd->NSAC = CSD_Tab[2];
/*!< Byte 3 */
SD_csd->MaxBusClkFrec = CSD_Tab[3];
/*!< Byte 4 */
SD_csd->CardComdClasses = CSD_Tab[4] << 4;
/*!< Byte 5 */
SD_csd->CardComdClasses |= (CSD_Tab[5] & 0xF0) >> 4;
SD_csd->RdBlockLen = CSD_Tab[5] & 0x0F;
/*!< Byte 6 */
SD_csd->PartBlockRead = (CSD_Tab[6] & 0x80) >> 7;
SD_csd->WrBlockMisalign = (CSD_Tab[6] & 0x40) >> 6;
SD_csd->RdBlockMisalign = (CSD_Tab[6] & 0x20) >> 5;
SD_csd->DSRImpl = (CSD_Tab[6] & 0x10) >> 4;
SD_csd->Reserved2 = 0; /*!< Reserved */
SD_csd->DeviceSize = (CSD_Tab[6] & 0x03) << 10;
/*!< Byte 7 */
SD_csd->DeviceSize |= (CSD_Tab[7]) << 2;
/*!< Byte 8 */
SD_csd->DeviceSize |= (CSD_Tab[8] & 0xC0) >> 6;
SD_csd->MaxRdCurrentVDDMin = (CSD_Tab[8] & 0x38) >> 3;
SD_csd->MaxRdCurrentVDDMax = (CSD_Tab[8] & 0x07);
/*!< Byte 9 */
SD_csd->MaxWrCurrentVDDMin = (CSD_Tab[9] & 0xE0) >> 5;
SD_csd->MaxWrCurrentVDDMax = (CSD_Tab[9] & 0x1C) >> 2;
SD_csd->DeviceSizeMul = (CSD_Tab[9] & 0x03) << 1;
/*!< Byte 10 */
SD_csd->DeviceSizeMul |= (CSD_Tab[10] & 0x80) >> 7;
SD_csd->EraseGrSize = (CSD_Tab[10] & 0x40) >> 6;
SD_csd->EraseGrMul = (CSD_Tab[10] & 0x3F) << 1;
/*!< Byte 11 */
SD_csd->EraseGrMul |= (CSD_Tab[11] & 0x80) >> 7;
SD_csd->WrProtectGrSize = (CSD_Tab[11] & 0x7F);
/*!< Byte 12 */
SD_csd->WrProtectGrEnable = (CSD_Tab[12] & 0x80) >> 7;
SD_csd->ManDeflECC = (CSD_Tab[12] & 0x60) >> 5;
SD_csd->WrSpeedFact = (CSD_Tab[12] & 0x1C) >> 2;
SD_csd->MaxWrBlockLen = (CSD_Tab[12] & 0x03) << 2;
/*!< Byte 13 */
SD_csd->MaxWrBlockLen |= (CSD_Tab[13] & 0xC0) >> 6;
SD_csd->WriteBlockPaPartial = (CSD_Tab[13] & 0x20) >> 5;
SD_csd->Reserved3 = 0;
SD_csd->ContentProtectAppli = (CSD_Tab[13] & 0x01);
/*!< Byte 14 */
SD_csd->FileFormatGrouop = (CSD_Tab[14] & 0x80) >> 7;
SD_csd->CopyFlag = (CSD_Tab[14] & 0x40) >> 6;
SD_csd->PermWrProtect = (CSD_Tab[14] & 0x20) >> 5;
SD_csd->TempWrProtect = (CSD_Tab[14] & 0x10) >> 4;
SD_csd->FileFormat = (CSD_Tab[14] & 0x0C) >> 2;
SD_csd->ECC = (CSD_Tab[14] & 0x03);
/*!< Byte 15 */
SD_csd->CSD_CRC = (CSD_Tab[15] & 0xFE) >> 1;
SD_csd->Reserved4 = 1;
/*!< Return the reponse */
return rvalue;
}
/**
* @brief Read the CID card register.
* Reading the contents of the CID register in SPI mode is a simple
* read-block transaction.
* @param SD_cid: pointer on an CID register structure
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_GetCIDRegister(SD_CID* SD_cid)
{
uint32_t i = 0;
SD_Error rvalue = SD_RESPONSE_FAILURE;
uint8_t CID_Tab[16];
/*!< SD chip select low */
SD_CS_LOW();
/*!< Send CMD10 (CID register) */
SD_SendCmd(SD_CMD_SEND_CID, 0, 0xFF);
/*!< Wait for response in the R1 format (0x00 is no errors) */
if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
{
if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
{
/*!< Store CID register value on CID_Tab */
for (i = 0; i < 16; i++)
{
CID_Tab[i] = SD_ReadByte();
}
}
/*!< Get CRC bytes (not really needed by us, but required by SD) */
SD_WriteByte(SD_DUMMY_BYTE);
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Set response value to success */
rvalue = SD_RESPONSE_NO_ERROR;
}
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte: 8 Clock pulses of delay */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Byte 0 */
SD_cid->ManufacturerID = CID_Tab[0];
/*!< Byte 1 */
SD_cid->OEM_AppliID = CID_Tab[1] << 8;
/*!< Byte 2 */
SD_cid->OEM_AppliID |= CID_Tab[2];
/*!< Byte 3 */
SD_cid->ProdName1 = CID_Tab[3] << 24;
/*!< Byte 4 */
SD_cid->ProdName1 |= CID_Tab[4] << 16;
/*!< Byte 5 */
SD_cid->ProdName1 |= CID_Tab[5] << 8;
/*!< Byte 6 */
SD_cid->ProdName1 |= CID_Tab[6];
/*!< Byte 7 */
SD_cid->ProdName2 = CID_Tab[7];
/*!< Byte 8 */
SD_cid->ProdRev = CID_Tab[8];
/*!< Byte 9 */
SD_cid->ProdSN = CID_Tab[9] << 24;
/*!< Byte 10 */
SD_cid->ProdSN |= CID_Tab[10] << 16;
/*!< Byte 11 */
SD_cid->ProdSN |= CID_Tab[11] << 8;
/*!< Byte 12 */
SD_cid->ProdSN |= CID_Tab[12];
/*!< Byte 13 */
SD_cid->Reserved1 |= (CID_Tab[13] & 0xF0) >> 4;
SD_cid->ManufactDate = (CID_Tab[13] & 0x0F) << 8;
/*!< Byte 14 */
SD_cid->ManufactDate |= CID_Tab[14];
/*!< Byte 15 */
SD_cid->CID_CRC = (CID_Tab[15] & 0xFE) >> 1;
SD_cid->Reserved2 = 1;
/*!< Return the reponse */
return rvalue;
}
/**
* @brief Send 5 bytes command to the SD card.
* @param Cmd: The user expected command to send to SD card.
* @param Arg: The command argument.
* @param Crc: The CRC.
* @retval None
*/
void SD_SendCmd(uint8_t Cmd, uint32_t Arg, uint8_t Crc)
{
uint32_t i = 0x00;
uint8_t Frame[6];
Frame[0] = (Cmd | 0x40); /*!< Construct byte 1 */
Frame[1] = (uint8_t)(Arg >> 24); /*!< Construct byte 2 */
Frame[2] = (uint8_t)(Arg >> 16); /*!< Construct byte 3 */
Frame[3] = (uint8_t)(Arg >> 8); /*!< Construct byte 4 */
Frame[4] = (uint8_t)(Arg); /*!< Construct byte 5 */
Frame[5] = (Crc); /*!< Construct CRC: byte 6 */
for (i = 0; i < 6; i++)
{
SD_WriteByte(Frame[i]); /*!< Send the Cmd bytes */
}
}
/**
* @brief Get SD card data response.
* @param None
* @retval The SD status: Read data response xxx0<status>1
* - status 010: Data accepted
* - status 101: Data rejected due to a crc error
* - status 110: Data rejected due to a Write error.
* - status 111: Data rejected due to other error.
*/
uint8_t SD_GetDataResponse(void)
{
uint32_t i = 0;
uint8_t response, rvalue;
while (i <= 64)
{
/*!< Read response */
response = SD_ReadByte();
/*!< Mask unused bits */
response &= 0x1F;
switch (response)
{
case SD_DATA_OK:
{
rvalue = SD_DATA_OK;
break;
}
case SD_DATA_CRC_ERROR:
return SD_DATA_CRC_ERROR;
case SD_DATA_WRITE_ERROR:
return SD_DATA_WRITE_ERROR;
default:
{
rvalue = SD_DATA_OTHER_ERROR;
break;
}
}
/*!< Exit loop in case of data ok */
if (rvalue == SD_DATA_OK)
break;
/*!< Increment loop counter */
i++;
}
/*!< Wait null data */
while (SD_ReadByte() == 0);
/*!< Return response */
return response;
}
/**
* @brief Returns the SD response.
* @param None
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_GetResponse(uint8_t Response)
{
uint32_t Count = 0xFFF;
/* Check if response is got or a timeout is happen */
while ((SD_ReadByte() != Response) && Count)
{
Count--;
}
if (Count == 0)
{
/* After time out */
return SD_RESPONSE_FAILURE;
}
else
{
/* Right response got */
return SD_RESPONSE_NO_ERROR;
}
}
/**
* @brief Returns the SD status.
* @param None
* @retval The SD status.
*/
uint16_t SD_GetStatus(void)
{
uint16_t Status = 0;
/*!< SD chip select low */
SD_CS_LOW();
/*!< Send CMD13 (SD_SEND_STATUS) to get SD status */
SD_SendCmd(SD_CMD_SEND_STATUS, 0, 0xFF);
Status = SD_ReadByte();
Status |= (uint16_t)(SD_ReadByte() << 8);
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte 0xFF */
SD_WriteByte(SD_DUMMY_BYTE);
return Status;
}
/**
* @brief Put SD in Idle state.
* @param None
* @retval The SD Response:
* - SD_RESPONSE_FAILURE: Sequence failed
* - SD_RESPONSE_NO_ERROR: Sequence succeed
*/
SD_Error SD_GoIdleState(void)
{
/*!< SD chip select low */
SD_CS_LOW();
/*!< Send CMD0 (SD_CMD_GO_IDLE_STATE) to put SD in SPI mode */
SD_SendCmd(SD_CMD_GO_IDLE_STATE, 0, 0x95);
/*!< Wait for In Idle State Response (R1 Format) equal to 0x01 */
if (SD_GetResponse(SD_IN_IDLE_STATE))
{
/*!< No Idle State Response: return response failue */
return SD_RESPONSE_FAILURE;
}
// SD_SendCmd(SD_CMD_SEND_IF_COND, 0, 0x65);
// /*!< Wait for In Idle State Response (R1 Format) equal to 0x01 */
// if (SD_GetResponse(SD_IN_IDLE_STATE))
// {
// /*!< No Idle State Response: return response failue */
// return SD_RESPONSE_FAILURE;
// }
/*----------Activates the card initialization process-----------*/
do
{
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send Dummy byte 0xFF */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< SD chip select low */
SD_CS_LOW();
/*!< Send CMD1 (Activates the card process) until response equal to 0x0 */
SD_SendCmd(SD_CMD_SEND_OP_COND, 0, 0xFF);
/*!< Wait for no error Response (R1 Format) equal to 0x00 */
}
while (SD_GetResponse(SD_RESPONSE_NO_ERROR));
/*!< SD chip select high */
SD_CS_HIGH();
/*!< Send dummy byte 0xFF */
SD_WriteByte(SD_DUMMY_BYTE);
return SD_RESPONSE_NO_ERROR;
}
/**
* @brief Write a byte on the SD.
* @param Data: byte to send.
* @retval None
*/
uint8_t SD_WriteByte(uint8_t Data)
{
/*!< Wait until the transmit buffer is empty */
while(SPI_I2S_GetFlagStatus(SD_SPI_INSTANCE, SPI_I2S_FLAG_TXE) == RESET)
{
}
/*!< Send the byte */
SPI_SendData8(SD_SPI_INSTANCE, Data);
/*!< Wait to receive a byte*/
while(SPI_I2S_GetFlagStatus(SD_SPI_INSTANCE, SPI_I2S_FLAG_RXNE) == RESET)
{
}
/*!< Return the byte read from the SPI bus */
return SPI_ReceiveData8(SD_SPI_INSTANCE);
}
/**
* @brief Read a byte from the SD.
* @param None
* @retval The received byte.
*/
uint8_t SD_ReadByte(void)
{
uint8_t Data = 0;
/*!< Wait until the transmit buffer is empty */
while (SPI_I2S_GetFlagStatus(SD_SPI_INSTANCE, SPI_I2S_FLAG_TXE) == RESET)
{
}
/*!< Send the byte */
SPI_SendData8(SD_SPI_INSTANCE, SD_DUMMY_BYTE);
/*!< Wait until a data is received */
while (SPI_I2S_GetFlagStatus(SD_SPI_INSTANCE, SPI_I2S_FLAG_RXNE) == RESET)
{
}
/*!< Get the received data */
Data = SPI_ReceiveData8(SD_SPI_INSTANCE);
/*!< Return the shifted data */
return Data;
}