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69 lines
1.6 KiB
Markdown
69 lines
1.6 KiB
Markdown
# The Basics
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The first `boot.py` will be executed when the interpreter starts. This file should contain only code associated with configuration. Then `main.py` will run. It is within this `main.py` that you will place your entry point code.
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## Connecting to a micropython board using screen on a Mac
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```
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screen /dev/cu.SLAB_USBtoUART 115200
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```
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To detach from a screen session first press `Ctrl-A` then `Ctrl-D`.
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To resume a detach session use:
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```
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screen -r
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```
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To kill a screen session press `Ctrl-A` then `k`. You will be prompted to confirm with `y\n` whether to kill the session or not.
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## Memory Usage
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These two functions can help you determine approximate memory usage.
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```
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import gc
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import os
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def df():
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s = os.statvfs('//')
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return ('{0} MB'.format((s[0]*s[3])/1048576))
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def free(full=False):
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gc.collect()
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F = gc.mem_free()
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A = gc.mem_alloc()
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T = F+A
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P = '{0:.2f}%'.format(F/T*100)
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if not full: return P
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else : return ('Total:{0} Free:{1} ({2})'.format(T,F,P))
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```
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# installing micropython on esp32
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1. Delete flash
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```
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esptool.py --port /dev/cu.SLAB_USBtoUART erase_flash
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```
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For an ESP32-S3
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```
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esptool.py --chip esp32-s3 --port /dev/cu.SLAB_USBtoUART erase_flash
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```
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2. If you have external spi ram (4MB) you want to use the spiram bin.
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```
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esptool.py --chip esp32 --port /dev/cu.SLAB_USBtoUART --baud 460800 write_flash -z 0x1000 ./binaries/esp32-idf4-20210202-v1.14.bin
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```
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For an ESP32-S3
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```
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esptool.py --chip esp32-s3 --port /dev/cu.SLAB_USBtoUART --baud 460800 write_flash -z 0x0000 ./binaries/GENERIC_S3_SPIRAM-20220117-v1.18.bin
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```
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