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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [or32/] [uart.h] - Rev 183
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/* uart.h. UART constant definitions. Copyright (C) 2004, Jacob Bower Copyright (C) 2010, Embecosm Limited <info@embecosm.com> Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> This file is part of Newlib. The original work by Jacob Bower is provided as-is without any kind of warranty. Use it at your own risk! All subsequent work is bound by version 3 of the GPL as follows. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http:#www.gnu.org/licenses/>. */ /* -------------------------------------------------------------------------- */ /* This program is commented throughout in a fashion suitable for processing with Doxygen. */ /* -------------------------------------------------------------------------- */ #ifndef UART__H #define UART__H #define UART_RX 0 /* In: Receive buffer (DLAB=0) */ #define UART_TX 0 /* Out: Transmit buffer (DLAB=0) */ #define UART_DLL 0 /* Out: Divisor Latch Low (DLAB=1) */ #define UART_DLM 1 /* Out: Divisor Latch High (DLAB=1) */ #define UART_IER 1 /* Out: Interrupt Enable Register */ #define UART_IIR 2 /* In: Interrupt ID Register */ #define UART_FCR 2 /* Out: FIFO Control Register */ #define UART_EFR 2 /* I/O: Extended Features Register */ /* (DLAB=1, 16C660 only) */ #define UART_LCR 3 /* Out: Line Control Register */ #define UART_MCR 4 /* Out: Modem Control Register */ #define UART_LSR 5 /* In: Line Status Register */ #define UART_MSR 6 /* In: Modem Status Register */ #define UART_SCR 7 /* I/O: Scratch Register */ /* * These are the definitions for the FIFO Control Register * (16650 only) */ #define UART_FCR_ENABLE_FIFO 0x01 /* Enable the FIFO */ #define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */ #define UART_FCR_CLEAR_XMIT 0x04 /* Clear the XMIT FIFO */ #define UART_FCR_DMA_SELECT 0x08 /* For DMA applications */ #define UART_FCR_TRIGGER_MASK 0xC0 /* Mask for the FIFO trigger range */ #define UART_FCR_TRIGGER_1 0x00 /* Mask for trigger set at 1 */ #define UART_FCR_TRIGGER_4 0x40 /* Mask for trigger set at 4 */ #define UART_FCR_TRIGGER_8 0x80 /* Mask for trigger set at 8 */ #define UART_FCR_TRIGGER_14 0xC0 /* Mask for trigger set at 14 */ /* 16650 redefinitions */ #define UART_FCR6_R_TRIGGER_8 0x00 /* Mask for receive trigger set at 1 */ #define UART_FCR6_R_TRIGGER_16 0x40 /* Mask for receive trigger set at 4 */ #define UART_FCR6_R_TRIGGER_24 0x80 /* Mask for receive trigger set at 8 */ #define UART_FCR6_R_TRIGGER_28 0xC0 /* Mask for receive trigger set at 14 */ #define UART_FCR6_T_TRIGGER_16 0x00 /* Mask for transmit trigger set at 16 */ #define UART_FCR6_T_TRIGGER_8 0x10 /* Mask for transmit trigger set at 8 */ #define UART_FCR6_T_TRIGGER_24 0x20 /* Mask for transmit trigger set at 24 */ #define UART_FCR6_T_TRIGGER_30 0x30 /* Mask for transmit trigger set at 30 */ /* * These are the definitions for the Line Control Register * * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits. */ #define UART_LCR_DLAB 0x80 /* Divisor latch access bit */ #define UART_LCR_SBC 0x40 /* Set break control */ #define UART_LCR_SPAR 0x20 /* Stick parity (?) */ #define UART_LCR_EPAR 0x10 /* Even parity select */ #define UART_LCR_PARITY 0x08 /* Parity Enable */ #define UART_LCR_STOP 0x04 /* Stop bits: 0=1 stop bit, 1= 2 stop bits */ #define UART_LCR_WLEN5 0x00 /* Wordlength: 5 bits */ #define UART_LCR_WLEN6 0x01 /* Wordlength: 6 bits */ #define UART_LCR_WLEN7 0x02 /* Wordlength: 7 bits */ #define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */ /* * These are the definitions for the Line Status Register */ #define UART_LSR_TEMT 0x40 /* Transmitter empty */ #define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */ #define UART_LSR_BI 0x10 /* Break interrupt indicator */ #define UART_LSR_FE 0x08 /* Frame error indicator */ #define UART_LSR_PE 0x04 /* Parity error indicator */ #define UART_LSR_OE 0x02 /* Overrun error indicator */ #define UART_LSR_DR 0x01 /* Receiver data ready */ /* * These are the definitions for the Interrupt Identification Register */ #define UART_IIR_NO_INT 0x01 /* No interrupts pending */ #define UART_IIR_ID 0x06 /* Mask for the interrupt ID */ #define UART_IIR_MSI 0x00 /* Modem status interrupt */ #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */ #define UART_IIR_TOI 0x0c /* Receive time out interrupt */ #define UART_IIR_RDI 0x04 /* Receiver data interrupt */ #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */ /* * These are the definitions for the Interrupt Enable Register */ #define UART_IER_MSI 0x08 /* Enable Modem status interrupt */ #define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */ #define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */ #define UART_IER_RDI 0x01 /* Enable receiver data interrupt */ /* * These are the definitions for the Modem Control Register */ #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */ #define UART_MCR_OUT2 0x08 /* Out2 complement */ #define UART_MCR_OUT1 0x04 /* Out1 complement */ #define UART_MCR_RTS 0x02 /* RTS complement */ #define UART_MCR_DTR 0x01 /* DTR complement */ /* * These are the definitions for the Modem Status Register */ #define UART_MSR_DCD 0x80 /* Data Carrier Detect */ #define UART_MSR_RI 0x40 /* Ring Indicator */ #define UART_MSR_DSR 0x20 /* Data Set Ready */ #define UART_MSR_CTS 0x10 /* Clear to Send */ #define UART_MSR_DDCD 0x08 /* Delta DCD */ #define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */ #define UART_MSR_DDSR 0x02 /* Delta DSR */ #define UART_MSR_DCTS 0x01 /* Delta CTS */ #define UART_MSR_ANY_DELTA 0x0F /* Any of the delta bits! */ /* * These are the definitions for the Extended Features Register * (StarTech 16C660 only, when DLAB=1) */ #define UART_EFR_CTS 0x80 /* CTS flow control */ #define UART_EFR_RTS 0x40 /* RTS flow control */ #define UART_EFR_SCD 0x20 /* Special character detect */ #define UART_EFR_ENI 0x10 /* Enhanced Interrupt */ /* The library functions defined here, avoiding namespace polution. */ extern void _uart_init (); extern void _uart_putc (char c); extern char _uart_getc (); #endif /* UART__H */
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