#include "xspi_l.h"#include "microsd.h"Go to the source code of this file.
Defines | |
| #define | Microsd_GetResponse(SDPtr) Microsd_GetRespToken(SDPtr, NULL, 0) |
| #define | Microsd_ReadSector(SDPtr, addrBySector, dataBuff) Microsd_ReadBlock(SDPtr, (addrBySector)*SECTOR_SIZE, dataBuff, SECTOR_SIZE) |
Functions | |
| Xuint8 | Microsd_crc7 (Xuint8 *MessBuff) |
| Xuint16 | Microsd_crc16 (Xuint8 *MessBuff, unsigned int len) |
| Xuint8 | Microsd_GetRespToken (Microsd *SDPtr, Xuint8 *RecvBuff, unsigned int NumBytes) |
| void | Microsd_Initialize (Microsd *SDPtr, Xuint32 BaseAddr) |
| void | Microsd_FlushRxFifo (Microsd *SDPtr) |
| Xuint8 | Microsd_ReadBlock (Microsd *SDPtr, Xuint32 addr, Xuint8 data[], int len) |
| Xuint8 | Microsd_SendCmd (Microsd *SDPtr, Xuint8 cmd_idx, Xuint32 arg) |
| Xuint8 | Microsd_SetSpiMode (Microsd *SDPtr) |
| void | Microsd_SpiTransfer (Microsd *SDPtr, Xuint8 SendBuff[], Xuint8 RecvBuff[], unsigned int NumBytes) |
Definition in file microsd.h.
| #define Microsd_GetResponse | ( | SDPtr | ) | Microsd_GetRespToken(SDPtr, NULL, 0) |
Send microSD card idle signal (0xFF) to get a response. This function terminates if the card does not responde after 1000 tries. See the function Microsd_GetRespToken() for more detail.
Definition at line 70 of file microsd.h.
Referenced by Microsd_SendCmd(), Microsd_SetSpiMode(), and Microsd_WriteBlock().
| #define Microsd_ReadSector | ( | SDPtr, | |||
| addrBySector, | |||||
| dataBuff | ) | Microsd_ReadBlock(SDPtr, (addrBySector)*SECTOR_SIZE, dataBuff, SECTOR_SIZE) |
Read a sector from the SD card. The address provided should be by sector instead of by byte. The length of the data is always SECTOR_SIZE (as defined in fat16.h). See the function Microsd_ReadBlock() for more detail.
Definition at line 81 of file microsd.h.
Referenced by Fat16_InitializeLoadBoot(), Fat16_SDLoadRootDir(), and Fat16_SDWriteFile().
| Xuint16 Microsd_crc16 | ( | Xuint8 * | MessBuff, | |
| unsigned int | len | |||
| ) |
This function calculates the CRC for a given message. The remainder is the 16-bit CRC.
| MessBuff | is the message to be sent to the microSD card. | |
| len | is the length of the message in bytes. |
Definition at line 76 of file microsd.c.
Referenced by Microsd_ReadBlock(), and Microsd_WriteBlock().
| Xuint8 Microsd_crc7 | ( | Xuint8 * | MessBuff | ) |
This function calculates the CRC for a given 6-byte message. The remainder is 7-bits padded with an extra zero on the right.
| MessBuff | is the 6-byte message to be sent to the microSD card. |
Definition at line 33 of file microsd.c.
Referenced by Microsd_SendCmd().
| void Microsd_FlushRxFifo | ( | Microsd * | InstPtr | ) |
This function empties out the response FIFO of the SPI module. This function should be used whenever another function needs to assume that the response FIFO is empty.
| SDPtr | is the pointer to the Microsd object. |
Definition at line 167 of file microsd.c.
Referenced by Microsd_ReadBlock(), Microsd_SendCmd(), Microsd_SetSpiMode(), and Microsd_WriteBlock().
| Xuint8 Microsd_GetRespToken | ( | Microsd * | SDPtr, | |
| Xuint8 * | RecvBuff, | |||
| unsigned int | NumBytes | |||
| ) |
Send microSD card idle signal (0xFF) to get a response. This function terminates, returning 0xFF, if the card does not responde after 1000 tries. The function stores the number of bytes given by NumBytes. The response token is stored into the buffer RecvBuff, NOT including the first byte. The first byte is instead returned.
| SDPtr | is the pointer to the Microsd object. | |
| RecvBuff | will hold the response token. | |
| NumBytes | is the length of the response in bytes. |
Definition at line 120 of file microsd.c.
References Microsd_SpiTransfer().
Referenced by Microsd_ReadBlock(), and Microsd_SetSpiMode().
| void Microsd_Initialize | ( | Microsd * | SDPtr, | |
| Xuint32 | BaseAddr | |||
| ) |
| Xuint8 Microsd_ReadBlock | ( | Microsd * | SDPtr, | |
| Xuint32 | addr, | |||
| Xuint8 | data[], | |||
| int | len | |||
| ) |
Read a block of data from the SD card, located by the address parameter. The data block is stored into the array data[].
| SDPtr | is the pointer the the Microsd object to communicate with. | |
| addr | is the address (by bytes) of the data block to be stored. | |
| data | is the array to store the data block. | |
| len | is the number of bytes for the data block. |
Definition at line 194 of file microsd.c.
References Microsd_crc16(), Microsd_FlushRxFifo(), Microsd_GetRespToken(), Microsd_SendCmd(), and Microsd_SpiTransfer().
Referenced by Fat16_SDReadFile().
| Xuint8 Microsd_SendCmd | ( | Microsd * | SDPtr, | |
| Xuint8 | cmd_idx, | |||
| Xuint32 | arg | |||
| ) |
Send a command to the SD card through the SPI bus.
| SDPtr | is the pointer the the Microsd object to communicate with. | |
| cmd_idx | is the 6-bit command index. | |
| arg | is the 32-bit argument for the command. |
Definition at line 249 of file microsd.c.
References Microsd_crc7(), Microsd_FlushRxFifo(), Microsd_GetResponse, and Microsd_SpiTransfer().
Referenced by Microsd_ReadBlock(), and Microsd_WriteBlock().
| Xuint8 Microsd_SetSpiMode | ( | Microsd * | SDPtr | ) |
Set the microSD card to SPI mode. This consists of a series of commands sent to the microSD card through the SPI bus. Verification of responses from the card will be examined to ensure that the card will be ready in SPI mode. Since many of the commands are constants, they are hard coded.
| SDPtr | is the pointer to the Microsd object to be initialized. |
Definition at line 284 of file microsd.c.
References Microsd_FlushRxFifo(), Microsd_GetResponse, Microsd_GetRespToken(), and Microsd_SpiTransfer().
| void Microsd_SpiTransfer | ( | Microsd * | SDPtr, | |
| Xuint8 | SendBuff[], | |||
| Xuint8 | RecvBuff[], | |||
| unsigned int | NumBytes | |||
| ) |
Transfer data through the SPI bus. For Every byte sent, a byte is recieved.
| SDPtr | is the pointer the the Microsd object to communicate with. | |
| SendBuff | is the buffer that holds the data to be sent to the slave. | |
| RecvBuff | is the buffer that will hold the data sent from the slave. | |
| NumBytes | is the number of bytes that will be snet and recieved. |
Definition at line 372 of file microsd.c.
Referenced by Microsd_GetRespToken(), Microsd_ReadBlock(), Microsd_SendCmd(), Microsd_SetSpiMode(), and Microsd_WriteBlock().
1.5.6