65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
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/*
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* Declare low level routines for the UARTs
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*/
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#ifndef __UART_H
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#define __UART_H
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/*
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* Set the data transfer speed
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*
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* Inputs:
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* uart = the number of the UART: 0 for COM1, 1 for COM2
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* bps_code = the UART_* code number for the bits-per-second
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*/
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extern void uart_setbps(short uart, unsigned short bps_code);
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/*
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* Set the line control register
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*
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* Inputs:
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* uart = the number of the UART: 0 for COM1, 1 for COM2
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* lcr_bits = the LCR settings
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*/
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extern void uart_setlcr(short uart, unsigned char lcr_bits);
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/*
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* Initialize a UART
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*
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* Inputs:
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* uart = the number of the UART: 0 for COM1, 1 for COM2
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*/
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extern void uart_init(short uart);
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/*
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* Return true (non-zero) if the UART has data ready to read in its FIFO
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*
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* Inputs:
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* uart = the number of the UART: 0 for COM1, 1 for COM2
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*
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* Returns:
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* non-zero if there is data to read, 0 if there is no data.
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*/
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extern short uart_has_bytes(short uart);
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/*
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* Send a byte to the UART. Blocks until the FIFO is ready to recieve a byte.
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*
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* Inputs:
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* uart = the number of the UART: 0 for COM1, 1 for COM2
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* b = the byte to send
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*/
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extern void uart_put(short uart, unsigned char b);
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/*
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* Get a byte from the UART. Blocks until there is data to read.
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*
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* Inputs:
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* uart = the number of the UART: 0 for COM1, 1 for COM2
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*
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* Returns:
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* the byte read from the UART
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*/
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extern unsigned char uart_get(short uart);
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#endif
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