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Previously individual ports documented these aspects to varying degrees, but most of the information is common to all ports. In particular, this adds a canonical explanation of `boot.py` and `main.py`. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>
65 lines
1.9 KiB
ReStructuredText
65 lines
1.9 KiB
ReStructuredText
.. _renesas-ra_program_in_flash:
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Write a program in internal file system
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=======================================
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Internal file system
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--------------------
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The FAT file system is created and initialized in the RA MCU's internal
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flash when the MicroPython starts at the first time on the board.
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The file system is mounted as "/flash", so you can access this flash system
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and create a program file into the /flash directory.
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As the factory setting, following size is allocated for the file system:
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=============== ===================
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Board File System Size
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--------------- -------------------
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EK-RA4M1 36KB ( 36864B)
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EK-RA4W1 64KB ( 65536B)
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EK-RA6M1 64KB ( 65536B)
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EK-RA6M2 128KB (131072B)
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RA4M1 CLICKER 36KB ( 36864B)
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=============== ===================
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As the factory setting, following 2 files are created in the file system:
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* boot.py : executed first when the system starts
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* main.py : executed after boot.py completes
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See :doc:`/reference/reset_boot` for more information.
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Write a program in the internal file system
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-------------------------------------------
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You can write a program in main.py which is executed automatically
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when the MicroPython starts. For example, you can write LED blinking
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program like below::
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import os
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os.getcwd()
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f = open('main.py', 'rw+')
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print(f.read())
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f.write('import time\n')
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f.write('from machine import Pin\n')
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f.write('led1 = Pin(Pin.cpu.P106)\n')
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f.write('while True:\n')
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f.write(' led1.on()\n')
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f.write(' time.sleep(1)\n')
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f.write(' led1.off()\n')
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f.write(' time.sleep(1)\n')
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f.close()
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f = open('main.py', 'r')
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print(f.read())
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f.close()
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Entering CTRL-D for software reset, the MicroPython reboots, displays
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following messages::
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MPY: sync filesystems
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MPY: soft reboot
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and main.py is executed and LED1 blinks per 1 second.
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If you want to stop the program, please enter CTRL-C.
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