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32bbba2fc5
lpc23xx has 2k of battery RAM that is retained in Deep Power Down mode. To not overwrite that data it must only be initialized on Power On Reset. However, RSIR looks the same when waking up from Deep Power Down as it does on the power-on case. So use 4 bytes of the backup RAM to keep a signature that is only valid if memory was retained (no power-on Reset). A small change to the linker script is required so two sections can be placed into flash.
7 lines
223 B
Makefile
7 lines
223 B
Makefile
# Put defined MCU peripherals here (in alphabetical order)
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FEATURES_PROVIDED += backup_ram
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FEATURES_PROVIDED += periph_dac
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FEATURES_PROVIDED += periph_gpio periph_gpio_irq
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-include $(RIOTCPU)/arm7_common/Makefile.features
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