Posted on March 07, 2013 at 09:36Hi Clive1
I used the exapmle that you have posted in wich you use the stm32f4 discovery and a micro sd card connected to the STM32 by the SDIO interface.
My question is that we don't have the same functions for example: SD_ReadMultiBlocksFIXED i have this function:
uint8_t MSD_ReadBuffer(uint8_t* pBuffer, uint32_t ReadAddr, uint32_t NumByteToRead)
{
uint32_t i = 0, NbrOfBlock = 0, Offset = 0;
uint8_t rvalue = MSD_RESPONSE_FAILURE;
/* Calculate number of blocks to read */
NbrOfBlock = NumByteToRead / BLOCK_SIZE;
/* MSD chip select low */
MSD_CS_LOW();
/* Data transfer */
while (NbrOfBlock --)
{
/* Send CMD17 (MSD_READ_SINGLE_BLOCK) to read one block */
MSD_SendCmd (MSD_READ_SINGLE_BLOCK, ReadAddr + Offset, 0xFF);
/* Check if the MSD acknowledged the read block command: R1 response (0x00: no errors) */
if (MSD_GetResponse(MSD_RESPONSE_NO_ERROR))
{
return MSD_RESPONSE_FAILURE;
}
/* Now look for the data token to signify the start of the data */
if (!MSD_GetResponse(MSD_START_DATA_SINGLE_BLOCK_READ))
{
/* Read the MSD block data : read NumByteToRead data */
for (i = 0; i < BLOCK_SIZE; i++)
{
/* Read the pointed data */
*pBuffer = MSD_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 MSD) */
MSD_ReadByte();
MSD_ReadByte();
/* Set response value to success */
rvalue = MSD_RESPONSE_NO_ERROR;
}
else
{
/* Set response value to failure */
rvalue = MSD_RESPONSE_FAILURE;
}
}
/* MSD chip select high */
MSD_CS_HIGH();
/* Send dummy byte: 8 Clock pulses of delay */
MSD_WriteByte(DUMMY);
/* Returns the reponse */
return rvalue;
}
so i have changed something in the file ff.c when calling the function f_read i put the 4th varaible to 512 to read 512 bytes.
But it returns FR_NO_FILE
