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Code Issues 4 Pull Requests Releases 4 Wiki Activity

Issue #18: Fix wrong documentation

This commit is contained in:
Mario Hüttel 2020-09-06 21:12:57 +02:00
parent c7ebe441c7
commit 569d42bbe9
1 changed files with 2 additions and 2 deletions
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doc/source/firmware/backup-ram.rst
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@ -9,7 +9,7 @@ Overview
The STM controller's backup RAM is used to store different kinds of information that shall be preserved if the controller resets.
The hardware setup is missing a separate powersupply for the controller's backup domain. Therefore, the backup RAM is cleared, when the power is cut.
The backup RAM is used to store permanent error flags (See :ref:`safety_flags`). This ensures the flags stay present, even if a system reset is performed. The only way to clear them is by cutting the power.
The backup RAM is used to store permanent error flags (See :ref:`safety_flags`). This ensures the flags that trigger hard faults / the panic mode, can be identified, although the wathcoog resets the controller. The only way to clear them is by cutting the power.
Because cutting the power is a way to clear the backup RAM, no separate method for clearing the error entries in the backup RAM is defined.
The backup RAM contents are protected by a `CRC Checksum`_.
@ -109,4 +109,4 @@ Therefore, the CRC calculation is fixed.
The polynomial is ``0x4C11DB7`` (Ethernet CRC32):
.. math:: P_{CRC}(x) = x^{32}+x^{26}+x^{23}+x^{22}+x^{16}+x^{12}+x^{11}+x^{10}+x^{8}+x^{7}+x^{5}+x^{4}+x^{2}+x+1
.. math:: P_{CRC}(x) = x^{32}+x^{26}+x^{23}+x^{22}+x^{16}+x^{12}+x^{11}+x^{10}+x^{8}+x^{7}+x^{5}+x^{4}+x^{2}+x+1