我在使用 ESP-Prog 在自定义
PCB 上闪存 ESP32-S3-WROOM-1u 时遇到了一个奇怪的问题。当 ESP-prog 串行接头上的 TX 线连接到 ESP32 的 RX0 引脚时，串行输出停止。在 VSCODE 中使用 platformio，串行监视器在 TX0 (ESP32) -> TX (ESP-prog) 或 RX0 (ESP32) -> RX (ESP-prog) 时从 ESP32 接收以下输出：
代码：
全选
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x3 (RTC_SW_SYS_RST),boot:0x9 (SPI_FAST_FLASH_BOOT)
Saved PC:0x403cdc76
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fce3808,len:0x1660
load:0x403c9700,len:0xbcc
load:0x403cc700,len:0x2fac
entry 0x403c9954
I (29) boot: ESP-IDF 4.4.4 2nd stage bootloader
I (29) boot: compile
time 20:42:44
I (29) boot: chip revision: v0.1
I (31) boot_comm: chip revision: 1, min. bootloader chip revision: 0
I (38) boot.esp32s3: Boot SPI Speed : 80MHz
I (43) boot.esp32s3: SPI Mode : DIO
I (47) boot.esp32s3: SPI Flash Size : 16MB
I (52) boot: Enabling RNG early entropy source...
I (58) boot: Partition Table:
I (61) boot: ## Label Usage Type ST Offset Length
I (68) boot: 0 nvs WiFi data 01 02 00009000 00006000
I (76) boot: 1 phy_init RF data 01 01 0000f000 00001000
I (83) boot: 2 factory factory app 00 00 00010000 00100000
I (91) boot: End of partition table
I (95) boot_comm: chip revision: 1, min. application chip revision: 0
I (102) esp_image: segment 0: paddr=00010020 vaddr=3c060020 size=20a24h (133668) map
I (135) esp_image: segment 1: paddr=00030a4c vaddr=3fc92ed0 size=02c34h ( 11316) load
I (137) esp_image: segment 2: paddr=00033688 vaddr=40374000 size=0c990h ( 51600) load
E (152) esp_image: invalid segment length 0xffffffff
E (152) boot: Factory app partition is not bootable
E (152) boot: No bootable app partitions in the partition table
在此配置中，如果启动按钮已修复并按下重置按钮，模块将检测到处于下载模式：
代码：
全选
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0x3 (DOWNLOAD(USB/UART0))
waiting for download
PLATFORM: Espressif 32 (6.1.0) > Espressif ESP32-S3-DevKitC-1-N8 (8 MB QD, No PSRAM)
HARDWARE: ESP32S3 240MHz, 320KB RAM, 16MB Flash
DEBUG: Current (esp-builtin) On-board (esp-builtin) External (cmsis-dap, esp-bridge, esp-prog, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa)
PACKAGES:
- framework-espidf @ 3.50001.0 (5.0.1)
- tool-cmake @ 3.16.4
- tool-esptoolpy @ 1.40500.0 (4.5.0)
- tool-idf @ 1.0.1
- tool-mconf @ 1.4060000.20190628 (406.0.0)
- tool-mkfatfs @ 2.0.1
- tool-mklittlefs @ 1.203.210628 (2.3)
- tool-mkspiffs @ 2.230.0 (2.30)
- tool-ninja @ 1.9.0
- tool-openocd-esp32 @ 2.1100.20220706 (11.0)
- toolchain-esp32ulp @ 1.23500.220830 (2.35.0)
- toolchain-riscv32-esp @ 11.2.0+2022r1
- toolchain-xtensa-esp32s3 @ 11.2.0+2022r1
Reading CMake configuration...
LDF: Library Dependency Finder ->
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 0 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Retrieving maximum program size .pio\build\esp32-s3-devkitc-1\firmware.elf
Checking size .pio\build\esp32-s3-devkitc-1\firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM: [ ] 3.5% (used 11552 bytes from 327680 bytes)
Flash: [== ] 19.2% (used 201345 bytes from 1048576 bytes)
Configuring upload protocol...
AVAILABLE: cmsis-dap, esp-bridge, esp-builtin, esp-prog, espota, esptool, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa
CURRENT: upload_protocol = esptool
Looking for upload port...
Using manually specified: COM9
Uploading .pio\build\esp32-s3-devkitc-1\firmware.bin
esptool.py v4.5
Serial port COM9
Connecting......................................
A fatal error occurred: Failed to connect to ESP32-S3: Download mode successfully detected, but getting no sync reply: The serial TX path seems to be down.
