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Updated Persistent Memory (markdown)

euquiq 2020-06-04 01:41:12 -03:00
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Persistent-Memory.md

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This is part of the **RTC (Real Time Clock) subsystem**, inside the LPC43xx chip on the Portapack hardware.
# RTC Subsystem
The RTC subsystem also keeps the actual clock (date / time) running, powered by a CR2032 battery, (which needs to be installed on the portapack board!), even when the unit is not connected to an USB power source.
The RTC subsystem keeps the actual clock (date / time) running, powered by a CR2032 battery, (which needs to be installed on the portapack board!), even when the unit is not connected to an USB power source.
This persistent memory is part of the **RTC (Real Time Clock) subsystem**, inside the LPC43xx chip on the portapack hardware.
If you are curious on how exactly the whole persistent memory is arranged, it's defined on `/firmware/chibios-portapack/os/hal/platforms/LPC43xx/lpc43xx.inc`:
The persistent memory map is defined at `/firmware/chibios-portapack/os/hal/platforms/LPC43xx/lpc43xx.inc`:
* **LPC_RTC_DOMAIN_BASE** (0x40040000)
* **LPC_ALARM_TIMER_BASE** (LPC_RTC_DOMAIN_BASE + 0x0000)
* **LPC_BACKUP_REG_BASE** (LPC_RTC_DOMAIN_BASE + 0x1000)
* **LPC_BACKUP_REG_BASE** (LPC_RTC_DOMAIN_BASE + 0x1000) <-- backup_ram region !
* **LPC_POWER_MODE_CTRL_BASE** (LPC_RTC_DOMAIN_BASE + 0x2000)
* **LPC_CREG_BASE** (LPC_RTC_DOMAIN_BASE + 0x3000)
* **LPC_EVENT_ROUTER_BASE** (LPC_RTC_DOMAIN_BASE + 0x4000)
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## backup_ram region
The **backup_ram region** is a small amount of ram (only 256 bytes), defined in `/firmware/common/memory_map.hpp` and labeled as "LPC_BACKUP_REG_BASE" starting at address **0x40041000**
The **backup_ram region** is a small amount of ram (only 256 bytes), defined in `/firmware/common/memory_map.hpp` and labeled as **LPC_BACKUP_REG_BASE** starting at address **0x40041000**
### data_t struct
The Portapack firmware uses the backup_ram region to store several uint32_t (and one uint64_t) variables, inside a struct, called "data_t", declared on /firmware/common/portapack_persistent_memory.cpp