本文详细介绍了通过ath_reg_rmw_set和ath_reg_rmw_clear函数来设置GPIO口为输入或输出的方法。具体步骤包括：首先将GPIO19设置为输入，接着将其设置为输出，并分别设置其值为0和1。
ath_reg_rmw_set(GPIO_OE_ADDRESS, (1 << 19))会把0x18040000 bit 19 设成1， 变成input.
应该用 ath_reg_rmw_clear(GPIO_OE_ADDRESS, (1 << 19))
然后改动GPIO19 output value,
GPIO19 = 0
ath_reg_rmw_clear(GPIO_OUT_ADDRESS, (1 << 19));
GPIO19 = 1
ath_reg_rmw_set(GPIO_OUT_ADDRESS, (1 << 19));
应该用 ath_reg_rmw_clear(GPIO_OE_ADDRESS, (1 << 19))
然后改动GPIO19 output value,
GPIO19 = 0
ath_reg_rmw_clear(GPIO_OUT_ADDRESS, (1 << 19));
GPIO19 = 1
ath_reg_rmw_set(GPIO_OUT_ADDRESS, (1 << 19));
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