![]() I also noticed that the SD library, for reasons that seem questionable (because people might connect their SD cards with long wires) forces half-speed on you, with no way to override it without editing the library. Perhaps that is because the SD library now uses that and it messes with it. I guess we have to use SPI.beginTransaction now. Now in investigating this, the first issue I found was that using SPI.setClockDivider() no longer works. So rather than being 1.5x faster, it's 2.4x slower. On the Zero, with its 48MHz clock speed, and SPI bus capable of running at 12MHz, but using the built in SPI library block transfer function, I'm getting a whole 3.75 FPS. When blitting full screen images on an Atmega328 running at 16MHz with a highly optimized SPI routine (direct register access) which was transmitting the data as fast as possible - 8MHz, I was getting almost 9 FPS. EraseBlockSize to map addresses to blocks.īlockDevice is the raw device that is meant to store flash data.So in testing out the SPI library on the Zero with my OLED display I've noticed it's slow. The start and len parameters are in block numbers, use transparently coalesce ranges of blocks into larger bundles if the chip A typical size is 4096.ĮraseBlockSize() int64 // EraseBlocks erases the given number of blocks. It must be a power of two, and may be as small as 1. This is used for the block size in EraseBlocks. WriteBlockSize() int64 // EraseBlockSize returns the smallest erasable area on this particular chip It can be used by a client to optimize writes, non-aligned writes Size() int64 // WriteBlockSize returns the block size in which data can be written to WriterAt // Size returns the number of bytes in this block device. ReaderAt // WriteAt writes the given number of bytes to the block device. ReadAt reads the given number of bytes from the block device. PB31 Pin = 63 // peripherals: TCC0 channel 1, TCC1 channel 3 PB17 Pin = 49 // peripherals: TCC0 channel 1 PB14 Pin = 46 PB15 Pin = 47 PB16 Pin = 48 // peripherals: TCC0 channel 0 PB13 Pin = 45 // peripherals: TCC0 channel 3 PB12 Pin = 44 // peripherals: TCC0 channel 2 PB11 Pin = 43 // peripherals: TCC0 channel 1 PA31 Pin = 31 // peripherals: TCC1 channel 1 PA26 Pin = 26 PA27 Pin = 27 PA28 Pin = 28 PA29 Pin = 29 PA30 Pin = 30 // peripherals: TCC1 channel 0 PA25 Pin = 25 // peripherals: TCC1 channel 3 PA24 Pin = 24 // peripherals: TCC1 channel 2 PA23 Pin = 23 // peripherals: TCC0 channel 1 PA22 Pin = 22 // peripherals: TCC0 channel 0 PA21 Pin = 21 // peripherals: TCC0 channel 3 PA20 Pin = 20 // peripherals: TCC0 channel 2 PA19 Pin = 19 // peripherals: TCC0 channel 3 PA18 Pin = 18 // peripherals: TCC0 channel 2 PA17 Pin = 17 // peripherals: TCC2 channel 1, TCC0 channel 3 PA16 Pin = 16 // peripherals: TCC2 channel 0, TCC0 channel 2 PA15 Pin = 15 // peripherals: TCC0 channel 1 ![]() PA14 Pin = 14 // peripherals: TCC0 channel 0 PA13 Pin = 13 // peripherals: TCC2 channel 1, TCC0 channel 3 PA12 Pin = 12 // peripherals: TCC2 channel 0, TCC0 channel 2 PA11 Pin = 11 // peripherals: TCC1 channel 1, TCC0 channel 3 PA10 Pin = 10 // peripherals: TCC1 channel 0, TCC0 channel 2 PA09 Pin = 9 // peripherals: TCC0 channel 1, TCC1 channel 3 PA08 Pin = 8 // peripherals: TCC0 channel 0, TCC1 channel 2 PA07 Pin = 7 // peripherals: TCC1 channel 1 PA06 Pin = 6 // peripherals: TCC1 channel 0 PA05 Pin = 5 // peripherals: TCC0 channel 1 ![]() PA02 Pin = 2 PA03 Pin = 3 PA04 Pin = 4 // peripherals: TCC0 channel 0 PA01 Pin = 1 // peripherals: TCC2 channel 1 PA00 Pin = 0 // peripherals: TCC2 channel 0
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