Serial Communication

Functions

• initSerial
• isTransmitEmpty
• serialPutChar

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initSerial

> Syntax:

int initSerial(void);

> Description:

Initializes the serial communication using the UART protocol.

This function configures the COM1 port with the following settings:
- Baud rate: 9600
- Data bits: 8
- Stop bits: 1
- Parity: None
- Flow control: None (relies on THR status)

Returns 0 on success, 1 if the serial chip is faulty.

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isTransmitEmpty

> Syntax:

int isTransmitEmpty(void);

> Description:

Checks if the transmit buffer is empty.

This function returns 1 if the transmit buffer is empty, otherwise it returns 0.

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serialPutChar

> Syntax:

uint8_t serialPutChar(char c);

> Description:

Sends a character over the serial port.

This function places the character c into the transmit buffer and returns 1. If the buffer is full, it waits until the buffer is empty and then places the character in the buffer.

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Note

All these functions use the COM1 port for serial communication.

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