samd51-micromod-bitbang

SPI Flash Bit-Bang for the v1.2 SAMD51 MicroMod

The v1.2 SAMD51 MicroMod boards have a layout error that swaps the MISO/MOSI pins going to the external flash. Those pins can't be re-muxed internally on the chip, so SPI is unavailable for use. This library replaces SPI calls with a bit-bang transfer routine, and is based on the Adafruit SPIFlash library.

Transfer speed is now ~4.7MHz, up from ~1.429MHz.

Available flash read/write functions

• begin(): Initialize the chip and save the jedec-id.
• read8(n): Reads 8-bit value from address n
• read16(n): "" 16-bit ""
• read32(n): "" 32-bit ""
• writeBuffer(addr, *buff, len): Writes *buff to addr + len.
• getUsedMemory(): Searches for a chunk of 0xffffffff and returns used bytes. Only works contiguously and if 0xffffffff isn't in the used data!
• eraseChip(): Erases entire chip.
• eraseSector(n): Erases a 4k sector at sectornumber n.
• eraseBlock32(n): Erases a 32k block at blocknumber n.
• eraseBlock64(n): Erases a 64k block at blocknumber n.
• getJEDECID(): Returns the JEDEC ID in the format (0xEF7018): Manufacturer ID(0xEF), Memory Type(0x70), Capacity(0x18)