b8de35658f
* Put something on screen * Use the 32bit watch_date_time repr to pass from JS * Implement periodic callbacks * Clear display on enabling * Hook up watch_set_led_color() to SVG (green-only) * Make debug output full-width * Remove default Emscripten canvas * Implement sleep and button clicks * Fix time zone conversion bug in beats-time app * Clean up warnings * Fix pin levels * Set time zone to browser value (if available) * Add basic backup data saving * Silence format specifier warnings in both targets * Remove unnecessary, copied files * Use RTC pointer to clear callbacks (if available) * Use preprocessor define to avoid hardcoding MOVEMENT_NUM_FACES * Change each face to const preprocessor definition * Remove Intl.DateTimeFormat usage * Update shell.html title, header * Add touch start/end event handlers on SVG buttons * Update shell.html * Update folder structure (shared, simulator, hardware under watch-library) * Tease out shared components from watch_slcd * Clean up simulator watch_slcd.c inline JS calls * Fix missing newlines at end of file * Add simulator warnings (except format, unused-paremter) * Implement remaining watch_rtc functions * Fix button bug on mouse down then drag out * Implement remaining watch_slcd functions * Link keyboard events to buttons (for keys A, L, M) * Rewrite event handling (mouse, touch, keyboard) in C * Set explicit text UTF-8 charset in shell.html * Address PR comments * Remove unused directories from include paths
53 lines
1.4 KiB
ReStructuredText
Executable File
53 lines
1.4 KiB
ReStructuredText
Executable File
The Flash Driver
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================
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Flash is a re-programmable memory that retains program and data
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storage even with power off.
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User can write or read several bytes from any valid address in a flash.
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As to the erase/lock/unlock command, the input parameter of address should
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be a bytes address aligned with the page start, otherwise, the command will fail
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to be executed. At the meantime, the number of pages that can be locked or unlocked
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at once depends on region size of the flash. User can get the real number
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from the function return value which could be different for the different devices.
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Features
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--------
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* Initialization/de-initialization
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* Writing/Reading bytes
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* Locking/Unlocking/Erasing pages
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* Notifications about errors or being ready for a new command
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Applications
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------------
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* Mini disk which can retain program and data storage
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* Boot loader
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* Non volatile storage
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Dependencies
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------------
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The peripheral which controls a re-programmable flash memory.
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Concurrency
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-----------
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N/A
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Limitations
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-----------
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User should pay attention to set a proper stack size in their application,
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since the driver manages a temporary buffer in stack to cache unchanged data
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when calling flash write and erase function.
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Due to flash memory architecture of SAMD21/D20/L21/L22/C20/C21/D09/D10/D11/R21,
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write operation erazes row content before each write.
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Known issues and workarounds
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----------------------------
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N/A
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