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software/liblitesdcard/sdcard: simplify readSector.

This commit is contained in:
Florent Kermarrec 2020-06-04 11:55:25 +02:00
parent 8c6f74d483
commit 0ec50881f0
1 changed files with 2 additions and 20 deletions
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22
litex/soc/software/liblitesdcard/sdcard.c
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@ -713,34 +713,16 @@ int sdcard_test(unsigned int blocks)
return 0; return 0;
} }
// Return values
#define SUCCESS 0x01
#define FAILURE 0x00
// READSECTOR
// Read a 512 byte sector from the SD CARD
// Given SECTORNUMBER and memory STORAGE
//
// Sequence
// Send CMD17 - Read Block
// Command Sequence is DUMMY=0xff CMD17=0x51 SECTORNUMBER (32bit UNSIGNED as bits 32-25,24-17, 16-9, 8-1) CRC=0xff
// Wait for SD CARD to send 0x00 indicating SD CARD is processing
// Wait for SD CARD to send 0xfe indicating SD CARD BLOCK START
// Read 512 bytes
// Read 8 DUMMY bytes
// Return 0 success, 1 failure
//
// Details from https://openlabpro.com/guide/interfacing-microcontrollers-with-sd-card/ section "Read/Write SD Card"
uint8_t readSector(uint32_t sectorNumber, uint8_t *storage) uint8_t readSector(uint32_t sectorNumber, uint8_t *storage)
{ {
int n; int n;
// FIXME: handle errors, svoid recopy. // FIXME: handle errors, avoid recopy.
sdcard_read(sectorNumber, 1); sdcard_read(sectorNumber, 1);
for(n=0; n<SD_BLOCK_SIZE; n++) for(n=0; n<SD_BLOCK_SIZE; n++)
storage[n] = sdread_buf[n]; storage[n] = sdread_buf[n];
return SUCCESS; return 1;
} }
#endif /* CSR_SDCORE_BASE */ #endif /* CSR_SDCORE_BASE */