1.25.19.12 SDMMCx_CommandSend Function
C
/* x = SDMMC instance number */ void SDMMCx_CommandSend ( uint8_t opCode, uint32_t argument, uint8_t respType, SDMMC_DataTransferFlags transferFlags )
Summary
This function allows the client to send a SD command on the SDMMC interface.
Description
This function is used to send a command on the SDMMC interface and start a transfer.
Precondition
SDMMCx_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 SDMMC_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
SDMMC_DataTransferFlags transferFlags; transferFlags.isDataPresent = false; // Send command 8 with 0x1AAA argument. The expected response is of R7 type. SDMMC1_CommandSend(8, 0x1AA, SDMMC_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.