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引脚编号	引脚名称
X2A8	X_UART3_TXD
X2A7	X_UART3_RXD

9.开发板默认配置

port
i2c	i2c3, cam	i2c4, tp	i2c5,expansion	i2c1, internal
spi	spi1, lcd	spi2,expansion	spi3, expansion
mcasp	mcasp1, codec	mcasp2, wifi/BT
vin	vin3A, camera
uart	uart3, console	uart5, RS232
mmc	mmc1, SD card	mmc3, wifi/BT
vout	vout2, LCD

10.开机按键

在上电后，核心板默认是关机状态，需要通过开机信号：

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