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[Time] Review delay #477

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Merged
merged 5 commits into from
Mar 26, 2019
Merged

[Time] Review delay #477

merged 5 commits into from
Mar 26, 2019

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@fpistm fpistm commented Mar 22, 2019 •
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  • Introduce DWT for cortex supporting it (cortex-m3/m4/m7).
  • Use DWT cycle counter to have delayMicroseconds not dependent to interrupt (example with OneWire).
  • Fix rollover for delayMicroseconds with cortex-m0 (no DWT)

Still to provide a delayMicroseconds not dependent to interrupt for cortex-m0 to allow for example OneWire usage with MCU based on this cortex.

Fix #176

fpistm added 5 commits March 22, 2019 09:33
@fpistm
[DWT] Add API
8650f6a 
Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
@fpistm
[DWT] Init at startup
fdc5780 
Signed-off-by: Frederic Pillon <frederic.pillon@st.com>
@fpistm
[Time] Use DWT cycle counter for delayMicroseconds
94d896d 
Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
@fpistm
[Time] Code format
f6afa67 
Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
@fpistm
[Time] Fix rollover
28bf0a5 
Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
@fpistm fpistm added bug 🐛 Something isn't working enhancement New feature or request fix 🩹 Bug fix labels Mar 22, 2019
@fpistm fpistm added this to the 1.5.1/1.6.0 milestone Mar 22, 2019
@fpistm fpistm self-assigned this Mar 22, 2019
@fpistm fpistm mentioned this pull request Mar 23, 2019
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@fpistm fpistm merged commit 1b7da56 into stm32duino:master Mar 26, 2019
@fpistm fpistm deleted the delay branch March 26, 2019 10:10
benwaffle pushed a commit to benwaffle/Arduino_Core_STM32 that referenced this pull request Apr 10, 2019
@fpistm
Merge pull request stm32duino#477 from fpistm/delay
a08c8d7 
[Time] Review delay
@hierophect hierophect mentioned this pull request Nov 12, 2019
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