Posted on January 11, 2015 at 20:46I'm having problems with communication through SDIO. In the initialization process, where are only sent commands, everything works, but the function HAL_SD_SendSDStatus is returning SD_START_BIT_ERR.
Informations about the circuit and firmware:
-STM32CubeMX v4.5.0 and STM32F4 library v1.3.0
-Clock always 400kHz (to ensure that I will not have problems with the bus speed in the tests)
-It uses the internal pull-up of the microcontroller
-Several sd cards were tested, all of them >=4GB and >=class 4, with FAT32
After debugging, I found that the problem happens in the code snippet (below) of the file
stm32f4xx_hal_sd.c within the
HAL_SD_SendSDStatus function:
/* Configure the SD DPSM (Data Path State Machine) */
sdio_datainitstructure.
DataTimeOut
=
SD_DATATIMEOUT
;
sdio_datainitstructure.
DataLength
= 64;
sdio_datainitstructure.
DataBlockSize
=
SDIO_DATABLOCK_SIZE_64B
;
sdio_datainitstructure.
TransferDir
=
SDIO_TRANSFER_DIR_TO_SDIO
;
sdio_datainitstructure.
TransferMode
=
SDIO_TRANSFER_MODE_BLOCK
;
sdio_datainitstructure.
DPSM
=
SDIO_DPSM_ENABLE
;
SDIO_DataConfig(hsd->
Instance
, &sdio_datainitstructure);
/* Send ACMD13 (SD_APP_STAUS) with argument as card's RCA */
sdio_cmdinitstructure.
Argument
= 0;
sdio_cmdinitstructure.
CmdIndex
=
SD_CMD_SD_APP_STAUS
;
SDIO_SendCommand(hsd->
Instance
, &sdio_cmdinitstructure);
Before call the
SDIO_DataConfig function, the
SDIO_STA register is 0, after call this function, the bits
RXFIFOE and
RXACT goes to 1, what is expected. After call the function
SDIO_SendCommand with the command
ACMD13, the bits
RXFIFOE and
RXACT goes to 0 and the bits
STBITERR and
CMDREND goes to 1. Here is where the problem happens.
Could anyone help me with this?
thanks,
Silas
#sdio #wait-for-you--clive1-!-!-! #stm32 #stm32f4 #sd
