diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/gen68302/console/console.c')
| -rw-r--r-- | c/src/lib/libbsp/m68k/gen68302/console/console.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/gen68302/console/console.c b/c/src/lib/libbsp/m68k/gen68302/console/console.c new file mode 100644 index 0000000000..7f488c5cfd --- /dev/null +++ b/c/src/lib/libbsp/m68k/gen68302/console/console.c @@ -0,0 +1,241 @@ +/* + * Initialize the MC68302 SCC2 for console IO board support package. + * + * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * $Id$ + */ + +#define GEN68302_INIT + +#include <rtems.h> +#include "console.h" +#include <bsp.h> + +#include "m68302.h" + +/* console_initialize + * + * This routine initializes the console IO driver. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: + */ + +rtems_device_driver console_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg, + rtems_id self, + rtems_unsigned32 *status +) +{ + volatile m302_dualPortRAM_t *p = &m302; + + p->reg.pacnt |= 0x0003; /* enable RXD2 and TXD2 signals */ + /* + * TODO: Check assembly code. I think gcc's volatile semantics force + * this to not use a CLR. + */ + p->reg.simode = 0; /* NMSI mode */ + + p->reg.scc[1].scon = 0x00d8; /* 9600 baud */ + p->reg.scc[1].scm = 0x01b1; + + p->scc2.parm.rfcr = 0x50; /* Rx buffers in supervisor data */ + p->scc2.parm.tfcr = 0x50; /* Tx buffers in supervisor data */ + p->scc2.parm.mrblr = 0x0001; /* Max Rx buffer length is 1 byte */ + + p->scc2.prot.uart.max_idl = 0x0000; /* 0 = maximum timeout value */ + p->scc2.prot.uart.brkcr = 0x0001; /* send 1 break char on STOP TX cmd */ + p->scc2.prot.uart.parec = 0x0000; /* reset parity error counter */ + p->scc2.prot.uart.frmec = 0x0000; /* reset framing error counter */ + p->scc2.prot.uart.nosec = 0x0000; /* reset noise error counter */ + p->scc2.prot.uart.brkec = 0x0000; /* reset break condition counter */ + + p->scc2.prot.uart.character[0] = 0x0003; /* use <ctrl>c as control char */ + p->scc2.prot.uart.character[1] = 0x8000; /* set end of cntrl char table */ + + p->scc2.bd.rx[0].status = 0xA000; /* RxBD0 empty, wrap, no intr */ + p->scc2.bd.rx[0].length = 0x0000; + p->scc2.bd.rx[0].buffer = + (rtems_unsigned8 *) &m302.scc2.bd.rx[1]; /* RxBD1 is Rx buffer */ + + p->reg.scc[1].dsr = 0x7000; /* set full-length last stop bit */ + + p->scc2.bd.tx[0].status = 0x3000; /* TxBD0 not ready, wrap, intr */ + p->scc2.bd.tx[0].length = 0x0001; + p->scc2.bd.tx[0].buffer = + (rtems_unsigned8 *) &m302.scc2.bd.tx[1]; /* TxBD1 is Tx buffer */ + + p->reg.scc[1].scce = 0xFF; /* clear all SCC event flags */ + p->reg.scc[1].sccm = 0x03; /* enable only Tx & Rx interrupts */ + p->reg.scc[1].scm = 0x01BD; + + *status = RTEMS_SUCCESSFUL; +} + + +/* is_character_ready + * + * Check to see if a character is available on the MC68302's SCC2. If so, + * then return a TRUE (along with the character). Otherwise return FALSE. + * + * Input parameters: pointer to location in which to return character + * + * Output parameters: character (if available) + * + * Return values: TRUE - character available + * FALSE - no character available + */ + +rtems_boolean is_character_ready( + char *ch /* -> character */ +) +{ +#define RXS (m302.scc2.bd.rx[0].status) +#define RXD (* ((volatile char *) m302.scc2.bd.rx[0].buffer)) + + for (;;) { + if (RXS & RBIT_HDLC_EMPTY_BIT) + return FALSE; + + *ch = RXD; + RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; + if ( *ch >= ' ' && *ch <= '~' ) + return TRUE; + } +} + + +/* inbyte + * + * Receive a character from the MC68302's SCC2. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: character read + */ + +char inbyte( void ) +{ + char ch; + +#define RXS (m302.scc2.bd.rx[0].status) +#define RXD (* ((volatile char *) m302.scc2.bd.rx[0].buffer)) + + do { + while (RXS & RBIT_HDLC_EMPTY_BIT) + /* Wait until character received */ ; + + ch = RXD; + RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; + + if (ch == '\r' || ch == '\n') + break; + } while (ch < ' ' || ch > '~'); + + return ch; +} + + +/* outbyte + * + * Transmit a character out on the MC68302's SCC2. + * It may support XON/XOFF flow control. + * + * Input parameters: + * ch - character to be transmitted + * + * Output parameters: NONE + */ + +void outbyte( + char ch +) +{ +#define TXS (m302.scc2.bd.tx[0].status) +#define TXD (* ((volatile char *) m302.scc2.bd.tx[0].buffer)) + +#define RXS (m302.scc2.bd.rx[0].status) +#define RXD (* ((volatile char *) m302.scc2.bd.rx[0].buffer)) + + while (TXS & RBIT_HDLC_READY_BIT) + /* Wait until okay to transmit */ ; + + /* + * Check for flow control requests and process. + */ + while ( ! (RXS & RBIT_HDLC_EMPTY_BIT)) { + if (RXD == XOFF) + do { + RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; + while (RXS & RBIT_HDLC_EMPTY_BIT) + /* Wait until character received */ ; + } while (RXD != XON); + RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; + } + + TXD = ch; + TXS = RBIT_HDLC_READY_BIT | RBIT_HDLC_WRAP_BIT; + if (ch == '\n') + outbyte('\r'); +} + +/* + * __read -- read bytes from the serial port. Ignore fd, since + * we only have stdin. + */ + +int __read( + int fd, + char *buf, + int nbytes +) +{ + int i = 0; + + for (i = 0; i < nbytes; i++) { + *(buf + i) = inbyte(); + if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) { + (*(buf + i++)) = '\n'; + (*(buf + i)) = 0; + break; + } + } + return (i); +} + +/* + * __write -- write bytes to the serial port. Ignore fd, since + * stdout and stderr are the same. Since we have no filesystem, + * open will only return an error. + */ + +int __write( + int fd, + char *buf, + int nbytes +) +{ + int i; + + for (i = 0; i < nbytes; i++) { + if (*(buf + i) == '\n') { + outbyte ('\r'); + } + outbyte (*(buf + i)); + } + return (nbytes); +} |