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2 ;----------------------------- ISC16IS740 UART -------------------------------

3 I2C_UART_PORT equ 50H

5 I2C_UART_RHR equ I2C_UART_PORT+00H ;R Receive Holding

6 I2C_UART_THR equ I2C_UART_PORT+00H ;W Transmit Holding

7 I2C_UART_IER equ I2C_UART_PORT+01H ;R/W Interrupt Enable

8 I2C_UART_FCR equ I2C_UART_PORT+02H ;W FIFO Control

9 I2C_UART_IIR equ I2C_UART_PORT+02H ;R Interrupt Identification

10 I2C_UART_LCR equ I2C_UART_PORT+03H ;R/W Line Control

11 I2C_UART_MCR equ I2C_UART_PORT+04H ;R/W Modem Control

12 I2C_UART_LSR equ I2C_UART_PORT+05H ;R Line Status

13 I2C_UART_MSR equ I2C_UART_PORT+06H ;R Modem Status

14 I2C_UART_SPR equ I2C_UART_PORT+07H ;R/W Scratchpad

15 I2C_UART_TCR equ I2C_UART_PORT+06H ;R/W Transmission Control

16 I2C_UART_TLR equ I2C_UART_PORT+07H ;R/W Trigger Level

17 I2C_UART_TXLVL equ I2C_UART_PORT+08H ;R Transmit FIFO Level

18 I2C_UART_RXLVL equ I2C_UART_PORT+09H ;R Receive FIFO Level

19 I2C_UART_EFCR equ I2C_UART_PORT+0FH ;R/W Extra Features

20 I2C_UART_DLL equ I2C_UART_PORT+00H ;R/W divisor latch LSB

21 I2C_UART_DLH equ I2C_UART_PORT+01H ;R/W divisor latch MSB

22 I2C_UART_EFR equ I2C_UART_PORT+02H ;R/W Enhanced Feature

23 I2C_UART_XON1 equ I2C_UART_PORT+04H ;R/W Xon1 word

24 I2C_UART_XON2 equ I2C_UART_PORT+05H ;R/W Xon2 word

25 I2C_UART_XOFF1 equ I2C_UART_PORT+06H ;R/W Xoff1 word

26 I2C_UART_XOFF2 equ I2C_UART_PORT+07H ;R/W Xoff2 word

29 ;-----------------------------------------------------------------------------

30 ; Output character in C

31 ; Return with character in C and A

33 i2c_uart_out:

34 IN A,(I2C_UART_LSR)

35 AND 20H

36 JR Z,i2c_uart_out ; wait till ready

37 LD A,C

38 OUT (I2C_UART_THR),A

39 RET

41 ;-----------------------------------------------------------------------------

42 ; Get character from I2C UART

43 ; Return character in A

45 i2c_uart_in:

46 IN A,(I2C_UART_LSR)

47 AND 01H

48 JR Z,i2c_uart_in ; wait till ready

49 IN (I2C_UART_RHR),A

50 RET