[can not write and read]Guru Meditation Error: Core 0 panic'ed (Load access fault). Exception was unhandled.

[QGB]

compile modserial.c sw_serial.h as micropython module

I connect IO8 IO9 together

>>> import serial
>>> port = serial.new(8,9,False,512)

>>> serial.open(port,9600)
E (93725) gpio: gpio_install_isr_service(449): GPIO isr service already installed
0

>>> serial.write(port,44)
>>> serial.write(port,44)
>>> serial.read(port)
-1

>>> serial.write(port,44)
>>> serial.any(port)
0



>>> serial.any(port)
0
>>> port
Guru Meditation Error: Core  0 panic'ed (Load access fault). Exception was unhandled.

Core  0 register dump:
MEPC    : 0x42007d5a  RA      : 0x42007d52  SP      : 0x3fcc47c0  GP      : 0x3fc93c00
TP      : 0x3fc99d64  T0      : 0x4005890e  T1      : 0x4038e4ba  T2      : 0xffffffff
S0/FP   : 0x3fcd00cc  S1      : 0x3c1368a4  A0      : 0x3fc9babc  A1      : 0x3fcc4c80
A2      : 0x00000001  A3      : 0x3fcc49a8  A4      : 0x00000009  A5      : 0x00000000
A6      : 0x00000000  A7      : 0x00000001  S2      : 0x00000001  S3      : 0x3fcb0480
S4      : 0x3fffffff  S5      : 0x000000b0  S6      : 0x3fcb03e9  S7      : 0x3fcc4990
S8      : 0x00000030  S9      : 0x3c12d000  S10     : 0x3c12d000  S11     : 0x3fc9c000
T3      : 0x00000000  T4      : 0x00000000  T5      : 0x00000000  T6      : 0x00000002
MSTATUS : 0x00001881  MTVEC   : 0x40380001  MCAUSE  : 0x00000005  MTVAL   : 0x00000012
MHARTID : 0x00000000

Stack memory:
3fcc47c0: 0x000000c0 0x3c137000 0x3fcd00cc 0x4203c54a 0x000000c0 0x0000045b 0x000022da 0x4200a7aa
3fcc47e0: 0x000000c0 0x3fcc49a4 0x3fcb03e8 0x403829e8 0x00000001 0x00000004 0x3fcc49ac 0x3fcc4990
3fcc4800: 0x3c128454 0x3fc9babc 0x3fcc49a8 0x00000000 0x00000012 0x00000000 0x3c136ba8 0x3fcc49a0
3fcc4820: 0x00000020 0x00000000 0x3fcc4a18 0x4207b8f6 0x403822c6 0x3fcc49f0 0x3fc9bb14 0x00000000
3fcc4840: 0x00000000 0x00000000 0x00000002 0x00000000 0x3fcc4990 0x00000030 0x3c12d000 0x3c12d000
3fcc4860: 0x3fc9c000 0x3fcc47f0 0x00000000 0x00000000 0x00000001 0x00000004 0x00000000 0x00000001
3fcc4880: 0x00000002 0x00000002 0x3fcb0480 0x00000004 0x3fcb0490 0x3fcc49a4 0x3fcb0488 0x4203b9c4
3fcc48a0: 0x00000002 0x0000bb00 0x00000001 0x3fcc49a4 0x000006e2 0x00000000 0x3fcb0488 0x40383b56
3fcc48c0: 0x00000030 0x000094bd 0x00000001 0x3fc9c000 0x3c12d000 0x3c12d000 0x00000001 0x00000002
3fcc48e0: 0x00000000 0x000000fc 0x3fcc4a10 0x00000011 0x00000001 0x3fcc4970 0x3fcc4998 0x3fcb03d0
3fcc4900: 0x3fcb05c0 0x00000000 0x00000010 0x4203b82c 0x3fcb0570 0x3fcb0570 0x3c122f5c 0x42007d16
3fcc4920: 0x3fcb0898 0x3fcc4970 0x3fcb0400 0x4200ab04 0x00000002 0x00000000 0x00000000 0x00000000
3fcc4940: 0x00000000 0x3fcb0400 0x00000002 0x3fcb03d0 0x3fcb05c0 0x00000000 0x3fcb0400 0x3fc9c000
3fcc4960: 0x3c12d000 0x3c12d000 0x00000030 0x3fcc4990 0x00000000 0x00000002 0x00000000 0x00000000
3fcc4980: 0x00000000 0x3fc9bb14 0x3fcc49f0 0x4200a8e8 0x3fcb0570 0x3fcb03e7 0x3fcc49a0 0x00000002
3fcc49a0: 0x3fc9bb14 0x3c135f64 0x3fcd00cc 0x3fcb0610 0x3c1231fc 0x00000004 0x3fcc49f0 0x4200a83c
3fcc49c0: 0x3c12d000 0x3c12d000 0x3c138000 0x3c138000 0x3c138000 0x3c138000 0x3c138000 0x3c121000
3fcc49e0: 0x00000001 0x00000004 0x3fcb0570 0x420476aa 0x0000003f 0x00000016 0x3fcc4b70 0x00000000
3fcc4a00: 0x3fcc4a4c 0x00000037 0x00000000 0x00000000 0x3fcb0898 0x3fcb0890 0x00000000 0x00000000
3fcc4a20: 0x4204762a 0x00000003 0x00000004 0x00000001 0x3c121000 0x3c138000 0x3c138000 0x3c138000
3fcc4a40: 0x3c138000 0x3c138000 0x3c12d000 0x3c12d000 0x3fc9c000 0x3fcc49f0 0x00000000 0x00000000
3fcc4a60: 0x00000001 0x00000001 0x3fcc500c 0x4038c930 0x00000000 0x00000000 0x3fcc500c 0x4038ccd2
3fcc4a80: 0x00000000 0x3fc9b000 0x3fc935d0 0x00000000 0x00000000 0x3fcd0498 0x3fcc0000 0x403919d6
3fcc4aa0: 0x3c138000 0x3c138000 0x3c138000 0x3c1217cc 0x00000002 0x00000000 0x3fc9b86c 0x4207b8f6
3fcc4ac0: 0x3fc9b640 0x00000054 0x3fc9b8e8 0x00000002 0x600c0000 0x00000001 0x00000001 0x00000002
3fcc4ae0: 0xffffffff 0x3c1217cc 0x00000002 0x3c121000 0x00000005 0x3fc9babc 0x3fcafd70 0x42046e4c
3fcc4b00: 0x00000004 0x3c1217cc 0x00000002 0x3c121000 0x00000004 0x00000000 0x3fc97078 0x42046efc
3fcc4b20: 0x00000001 0x3fc9c000 0x3fc939c4 0x4202d7b4 0x00000001 0x3fc9c000 0x3fc939c4 0x3c121000
3fcc4b40: 0x00000001 0x00000004 0x00000003 0x3c121000 0x00000001 0x00000004 0x00000003 0x42047aca
3fcc4b60: 0x00003800 0x3fcbfff8 0x3fc9babc 0x3fc9fff8 0x00000038 0x00000004 0x3fcafd70 0x3fc9ff00
3fcc4b80: 0x00003800 0x3c12d000 0x3c12d000 0x3fc9fff8 0x00003800 0x3fcbfff8 0x3fc9babc 0x42029000
3fcc4ba0: 0x00000000 0x00000001 0x3fc9b000 0x420292c0 0x00000000 0x3fcc4bb0 0x00000000 0x00000000



ELF file SHA256: 9d0cedd548daa278

Rebooting...
ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0xc (RTC_SW_CPU_RST),boot:0xc (SPI_FAST_FLASH_BOOT)
Saved PC:0x403809ac
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd6100,len:0xe3c
load:0x403ce000,len:0x6f4
load:0x403d0000,len:0x28d8
entry 0x403ce000

[QGB]

@thirstyone any solution ?

[thirstyone]

they say, softserial doesn't work in 'loopback' mode :-) try attaching a usb-serial adapter and working from terminal.

[QGB]

I use the serial connect to other devices. also not work

E (93725) gpio: gpio_install_isr_service(449): GPIO isr service already installed Does this error message matter?

[thirstyone]

not sure if that error is related to your problem. could be. I suggest that you use a logic analyzer to check what's going on on the bus.