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aabfd73c3a
Use a formatting function to give more human-readable output formats for flash bandwidth. When the test starts and ends in less than one millisecond, report as "Infinite". Sample output: ```` Creating 512KB file, may take a while... ==> Time to write 512KB in 256b chunks = 6641 milliseconds ==> Created file size = 524288 Reading 512KB file sequentially in 256b chunks ==> Time to read 512KB sequentially in 256b chunks = 211 milliseconds = 2.48 MB/s Reading 512KB file MISALIGNED in flash and RAM sequentially in 256b chunks ==> Time to read 512KB sequentially MISALIGNED in flash and RAM in 256b chunks = 212 milliseconds = 2.47 MB/s Reading 512KB file in reverse by 256b chunks ==> Time to read 512KB in reverse in 256b chunks = 367 milliseconds = 1.43 MB/s Writing 64K file in 1-byte chunks ==> Time to write 64KB in 1b chunks = 1249 milliseconds = 52.47 KB/s Reading 64K file in 1-byte chunks ==> Time to read 64KB in 1b chunks = 296 milliseconds = 221.41 KB/s ````