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4b2fd720a7
This change is to remove a halt at about 200KiB while sending a large(1MiB) binary to a micro controller using USART1. USART1 is connected to a PC via an on-board ST-Link debugger that also functions as a USB-Serial converter. However, it seems to loss some data occasionally. So I changed the serial port to USART6 and connected it to the PC using an FTDI USB-Serial cable, therefore the transmission was successfully completed. Signed-off-by: Toshifumi NISHINAGA <tnishinaga.dev@gmail.com>