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想写个模拟IIC，但在读SDA并判断ACK时，不知道应该用哪个函数读GPIO值，SDK中只有uint8_t gpio_portX_read(void)这个函数，但没有详细描述
get current value of gpio PORTA. #define I2C_SDA_PIN 7 (gpio_porta_read() & BIT(I2C_SDA_PIN))