fs_format_mount Directory Reference

Directory dependency graph for fs_format_mount:

Directories
	src

Detailed Description

Formats, mounts and exercises a real microSD card in every filesystem ra8_fs can write – FAT12, FAT16, FAT32 and exFAT – one after another. It assumes no pre-existing layout: for each type it runs ra8_fs_format(), mounts and asserts the detected type matches, then creates, writes, reads back and byte-compares a deterministic payload, renames the file and re-reads it intact, unlinks it and unmounts. This is the on-hardware exercise for the ra8_fs_format() mkfs API.

This app erases the card. Insert a disposable one.

The exFAT trial additionally asserts an empty root directory twice: immediately after the format, where the bitmap, up-case and volume-label system entries must stay hidden, and again after the unlink, which proves the directory-set teardown fully reclaimed the entry.

Any card of roughly half a megabyte or more works. The formatter's auto cluster-size sweep lands each type's cluster count in its valid band – FAT12 below 4085 clusters, FAT16 4085 to 65524, FAT32 65525 and up – but on a typical multi-gigabyte card FAT12 and FAT16 exceed their ceilings even at the maximum cluster size. A type that cannot fit the card is skipped, not failed, so the run still ends in an all-pass, which means a large card silently exercises fewer paths than a small one. Use a small card, or a small emulator-attached card, to cover every type.

Hardware

A Digilent PMOD MicroSD (part 410-380) in Pmod2 (J25), driven by SCI0 in Simple-SPI mode.

EK-RA8D2 pin	PMOD MicroSD signal	Net (UM Table 19 p 27)
Pmod2.1 P604	CS	SSLB0 (GPIO output)
Pmod2.2 P603	COPI	MOSIB (UM legacy name)
Pmod2.3 P602	CIPO	MISOB (UM legacy name)
Pmod2.4 P601	SCK	RSPCKB
Pmod2.5 GND	GND	GND
Pmod2.6 3V3	3V3	3V3