Description: // 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.
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使用单片机普通IO口模拟串口三种方法.txt
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