// 1. get_rx_pin_status() // Returns 0 or 1 dependent on whether the receive pin is high or low. // 2. set_tx_pin_high() // Sets the transmit pin to the high state. // 3. set_tx_pin_low() // Sets the transmit pin to the low state. // 4. idle() // Background functions to execute while waiting for input. // 5. timer_set( BAUD_RATE ) // Sets the timer to 3 times the baud rate. // Enables the timer interrupt.

使用单片机普通IO口模拟串口三种方法.txt

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