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Issue #18: Fix wrong documentation

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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 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 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. 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`_. 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): 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