ESP32-S3: machine.bitstream() can't send 6 bytes
Port, board and/or hardware
ESP32-S3, octal SPIRAM on ESP32-S3-WROOM-1-N8R16 module
MicroPython version
MicroPython v1.23.0 on 2024-08-19; Generic ESP32S3 module with Octal-SPIRAM with ESP32S3
built using ESP-IDF v5.2.2
Reproduction
When I execute the following code and watch GPIO12 on an oscilloscope, I see 96 pulses instead of the expected 48:
from machine import Pin, bitstream
buf = bytearray(6)
bitstream(Pin(12, Pin.OUT), 0, (240, 480, 480, 240), buf)
I have tested with a buffer of between 1 and 19 bytes, and I only get the wrong number of pulses for 6 byte buffers.
Expected behaviour
I expect to get 48 pulses on my pin.
Observed behaviour
I see 96 pulses on the pin.
Additional Information
No, I've provided everything above.
Code of Conduct
Yes, I agree
ESP32S3N16R8：Missing flash ORIGINALLY 16M , ACTUALLY 8M
Port, board and/or hardware
esp32s3N16R8 port
MicroPython version
MicroPython v1.25.0 on 2025-04-15; Generic ESP32S3 module with Octal-SPIRAM with ESP32S3
<img width="1075" height="667" alt="Image" src="https://github.com/user-attachments/assets/3ee7bfa2-4046-4e5e-abd8-e6382d9e62a7" />
Reproduction
In according to official guidance , open powershell echo：
esptool --baud 460800 write_flash 0 .\ESP32_GENERIC_S3-SPIRAM_OCT-20250415-v1.25.0.bin
click RST button，and open thonny，execute
import esp
import gc
print(esp.flash_size())
print(esp.flash_user_start())
print(gc.mem_free())
you will find a problem like result below.
- First line is flash size ,equals 8M，corresponds to rom
- Second Line is user partition start，I know，
ESP32_GENERIC_S3-SPIRAM_OCT-20250415-v1.25.0.binis 1.5M , from 2M maybe reasonable. - Third Line is mem_free, corresponds to ram .
8388608
2097152
8320080
Actually my board is N16R8, means 16M psrom and 8M psram. after using Micropython bin, I got 8M rom , and 8M ram ,where is 8M left from flash?
I chose OCT version bin due to 8M psram, but normal and OCT version both miss flash size. I don't know why and how i need to do or it's something being limited.
And thonny is also 6m，maybe 8M-2M?
<img width="1427" height="700" alt="Image" src="https://github.com/user-attachments/assets/0b63906e-d976-478f-82e7-b166ddc521f8" />
Expected behaviour
get missed 8m flash size for using
Observed behaviour
like above.
Additional Information
No, I've provided everything above.
Code of Conduct
Yes, I agree