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USB_SERIAL_JTAG: Fix the issue that there is no rom log when restarting

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Cao Sen Miao
2021-11-23 13:07:43 +08:00
parent 92b1ea2199
commit 17ea9d7faf
6 changed files with 74 additions and 22 deletions
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5
docs/en/api-guides/usb-serial-jtag-console.rst
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@@ -55,11 +55,12 @@ Limitations
There are several limitations to the USB console feature. These may or may not be significant, depending on the type of application being developed, and the development workflow.
{IDF_TARGET_BOOT_PIN:default = "GPIO0", esp32c3 = "GPIO9"}
{IDF_TARGET_BOOT_PIN:default = "Not Updated!", esp32c3 = "GPIO9", esp32s3 = "GPIO0"}
1. If the application accidentally reconfigures the USB peripheral pins, or disables the USB Serial/JTAG Controller, the device will disappear from the system. After fixing the issue in the application, you will need to manually put the {IDF_TARGET_NAME} into download mode by pulling low {IDF_TARGET_BOOT_PIN} and resetting the chip.
2. If the application enters light sleep (including automatic light sleep) or deep sleep mode, USB CDC device will disappear from the system.
2. If the application enters deep sleep mode, USB CDC device will disappear from the system.
3. The behavior between an actual USB-to-serial bridge chip and the USB Serial/JTAG Controller is slightly different if the ESP-IDF application does not listen for incoming bytes. An USB-to-serial bridge chip will just send the bytes to a (not listening) chip, while the USB Serial/JTAG Controller will block until the application reads the bytes. This can lead to a non-responsive looking terminal program.
4. If the application enters light-sleep (including automatic light-sleep) or software reset, etc. The USB CDC device will still work on the system. But be aware that this might increase the power consumption, if you don't need USB CDC in sleep and want to keep low power consumption, please disable the menuconfig ``CONFIG_RTC_CLOCK_BBPLL_POWER_ON_WITH_USB``. Moreover, the power consumption will only increase when your USB CDC port is really in use (like data transaction), therefore, if your USB CDC just connects with power bank or battery, rather than something like computer, you don't need to care about the increasing power consumption mentioned above.