1.22.24.12 1.32.25.12 SDHCx_CommandSend Function
C
/* x = SDHC instance number (x is applicable only on devices with more than one instances of SDHC) */ void SDHCx_CommandSend ( uint8_t opCode, uint32_t argument, uint8_t respType, SDHC_DataTransferFlags transferFlags )
Summary
This function allows the applicaton to send a SD command on the SDHC interface.
Description
This function is used to send a command on the SDHC interface and start a transfer.
Precondition
SDHCx_Initialize() must have been called first for the associated instance.
Parameters
Param | Description |
---|---|
opCode | The SD command opcode |
argument | The argument to the SD command |
respType | The expected response type for the given SD command. Refer to the SDHC_CMD_RESP_TYPE enum for the possible values of the response type |
transferFlags | Transfer flags associated with data transfer Indicates if the transfer contains data stage or not. If the data stage is present, the transferFlags indicate transfer type - single block or multiple block and the transfer direction - read or write |
Returns
None.
Example
SDHC_DataTransferFlags transferFlags; transferFlags.isDataPresent = false; // Send command 8 with 0x1AAA argument. The expected response is of R7 type. SDHC1_CommandSend(8, 0x1AA, SDHC_CMD_RESP_R7, transferFlags);
Remarks
The function only supports commonly used SD commands and does not support all the commands specified in the SD protocol.