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Adjust for timing shift on Max7219 displays on AVR's

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Something has shifted.   The previous timing delays on the Max7219 debug displays is too tight without this correction.
I suspect something has been optimized and roughly 50ns of needed setup and hold time has disappeared.
This corrects the issue and the display results are clean again.
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Roxy-3D 2020-03-24 17:08:31 -05:00 committed by GitHub
parent 68face848a
commit 5d515c3a2f
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1 changed files with 1 additions and 1 deletions
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Marlin/src/feature/max7219.cpp
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@ -121,7 +121,7 @@ uint8_t Max7219::suspended; // = 0;
#define CRITICAL_SECTION_START() NOOP #define CRITICAL_SECTION_START() NOOP
#define CRITICAL_SECTION_END() NOOP #define CRITICAL_SECTION_END() NOOP
#else #else
#define SIG_DELAY() DELAY_NS(188) // Delay for 0.1875µs (16MHz AVR) or 0.15µs (20MHz AVR) #define SIG_DELAY() DELAY_NS(250) // Delay for 0.1875µs (16MHz AVR) or 0.15µs (20MHz AVR)
#endif #endif
void Max7219::error(const char * const func, const int32_t v1, const int32_t v2/*=-1*/) { void Max7219::error(const char * const func, const int32_t v1, const int32_t v2/*=-1*/) {