Update SPI.h - Add transfer_out #4573
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An alternative "output only" transfer that doesn't destroy the source buffer with the bytes returned from the slave device. Some code simplifications and const enforcement of input variables Tested in ATMEGA328p (UNO) * no speed changes noticed (comparing the the original function) * writing/reading to an SPI RAM returns the correct values
An alternative "output only" transfer that doesn't destroy the contents of the source buffer with the bytes returned from the slave device. * Some code simplifications and const enforcement * Revision with speedup of about 25% in atmega328p tests * NOTE: I can't explain that "*(p++ + 1);" being speedier than "*++p"
Near cosmetic change, in the cast, keep the pointer to const values
Avoid double calls in several methods by changing them to inline
When verbose output is enabled, bossac was run in debug mode, changed to only extra info (-i)
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Amalabdu7708
approved these changes
Feb 23, 2025
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An alternative "output only" transfer that doesn't destroy the source buffer with the bytes returned from the slave device.
Some code simplifications and const enforcement of input variables
Tested in ATMEGA328p (UNO)