Chapter 5. Hardware Development
Note:
• It is advised to download the rmware only after the “waiting for download”log shows via serial ports.
• Serial tools cannot be used simultaneously with the Flash Download Tool on one com port.
• The USB auto-download will be disabled if the following conditions occur in the application, where it will be
necessary to set the chip or module to Joint Download Boot mode rst by conguring the strapping pin.
– USB PHY is disabled by the application;
– USB is secondary developed for other USB functions, e.g., USB host, USB standard device;
– USB IOs are congured to other peripherals, such as UART and LEDC.
• It is recommended that the user retains control of the strapping pins to avoid the USB download function not
being available in case of the above scenario.
Espressif Systems 40
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