diff options
Diffstat (limited to 'src/avrdude/ppi.c')
| -rw-r--r-- | src/avrdude/ppi.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/src/avrdude/ppi.c b/src/avrdude/ppi.c new file mode 100644 index 000000000..2706b850e --- /dev/null +++ b/src/avrdude/ppi.c @@ -0,0 +1,236 @@ +/* + * avrdude - A Downloader/Uploader for AVR device programmers + * Copyright (C) 2000-2004 Brian S. Dean <bsd@bsdhome.com> + * + * 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 2 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/>. + */ + +/* $Id$ */ + + +#if !defined(WIN32NATIVE) + +#include "ac_cfg.h" + +#if HAVE_PARPORT + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> + +#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) +# include "freebsd_ppi.h" +#elif defined(__linux__) +# include "linux_ppdev.h" +#elif defined(__sun__) || defined(__sun) /* Solaris */ +# include "solaris_ecpp.h" +#endif + +#include "avrdude.h" +#include "libavrdude.h" + +#include "ppi.h" + +enum { + PPI_READ, + PPI_WRITE, + PPI_SHADOWREAD +}; + +static int ppi_shadow_access(union filedescriptor *fdp, int reg, + unsigned char *v, unsigned char action) +{ + static unsigned char shadow[3]; + int shadow_num; + + switch (reg) { + case PPIDATA: + shadow_num = 0; + break; + case PPICTRL: + shadow_num = 1; + break; + case PPISTATUS: + shadow_num = 2; + break; + default: + avrdude_message(MSG_INFO, "%s: avr_set(): invalid register=%d\n", + progname, reg); + return -1; + break; + } + + switch (action) { + case PPI_SHADOWREAD: + *v = shadow[shadow_num]; + break; + case PPI_READ: + DO_PPI_READ(fdp->ifd, reg, v); + shadow[shadow_num]=*v; + break; + case PPI_WRITE: + shadow[shadow_num]=*v; + DO_PPI_WRITE(fdp->ifd, reg, v); + break; + } + return 0; +} + +/* + * set the indicated bit of the specified register. + */ +int ppi_set(union filedescriptor *fdp, int reg, int bit) +{ + unsigned char v; + int rc; + + rc = ppi_shadow_access(fdp, reg, &v, PPI_SHADOWREAD); + v |= bit; + rc |= ppi_shadow_access(fdp, reg, &v, PPI_WRITE); + + if (rc) + return -1; + + return 0; +} + + +/* + * clear the indicated bit of the specified register. + */ +int ppi_clr(union filedescriptor *fdp, int reg, int bit) +{ + unsigned char v; + int rc; + + rc = ppi_shadow_access(fdp, reg, &v, PPI_SHADOWREAD); + v &= ~bit; + rc |= ppi_shadow_access(fdp, reg, &v, PPI_WRITE); + + if (rc) + return -1; + + return 0; +} + + +/* + * get the indicated bit of the specified register. + */ +int ppi_get(union filedescriptor *fdp, int reg, int bit) +{ + unsigned char v; + int rc; + + rc = ppi_shadow_access(fdp, reg, &v, PPI_READ); + v &= bit; + + if (rc) + return -1; + + return v; /* v == bit */ +} + +/* + * toggle the indicated bit of the specified register. + */ +int ppi_toggle(union filedescriptor *fdp, int reg, int bit) +{ + unsigned char v; + int rc; + + rc = ppi_shadow_access(fdp, reg, &v, PPI_SHADOWREAD); + v ^= bit; + rc |= ppi_shadow_access(fdp, reg, &v, PPI_WRITE); + + if (rc) + return -1; + + return 0; +} + + +/* + * get all bits of the specified register. + */ +int ppi_getall(union filedescriptor *fdp, int reg) +{ + unsigned char v; + int rc; + + rc = ppi_shadow_access(fdp, reg, &v, PPI_READ); + + if (rc) + return -1; + + return v; /* v == bit */ +} + +/* + * set all bits of the specified register to val. + */ +int ppi_setall(union filedescriptor *fdp, int reg, int val) +{ + unsigned char v; + int rc; + + v = val; + rc = ppi_shadow_access(fdp, reg, &v, PPI_WRITE); + + if (rc) + return -1; + + return 0; +} + + +void ppi_open(char * port, union filedescriptor *fdp) +{ + int fd; + unsigned char v; + + fd = open(port, O_RDWR); + if (fd < 0) { + avrdude_message(MSG_INFO, "%s: can't open device \"%s\": %s\n", + progname, port, strerror(errno)); + fdp->ifd = -1; + return; + } + + ppi_claim (fd); + + /* + * Initialize shadow registers + */ + + ppi_shadow_access (fdp, PPIDATA, &v, PPI_READ); + ppi_shadow_access (fdp, PPICTRL, &v, PPI_READ); + ppi_shadow_access (fdp, PPISTATUS, &v, PPI_READ); + + fdp->ifd = fd; +} + + +void ppi_close(union filedescriptor *fdp) +{ + ppi_release (fdp->ifd); + close(fdp->ifd); +} + +#endif /* HAVE_PARPORT */ + +#endif /* !WIN32NATIVE */ |