Continue with GSM task. Try solve problem how to get GSM receive our coding and the function "CALL READY" also not interframe. Other thing that Mr. Mazran told us which try use interrupt function.
UART
UART is stand for Universal Asynchronous Receiver Transmitter. UART signal is use to send and receive data over the three wires, which is TX, RX and GND. Synchronous transmission requires the sender and receiver to share the same clock signal. While the Synchronous transmission allow the data is sent without a clock signal sent but the sending and receiver must to operate at the same timing parameter known as Baud Rate.
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