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Diffstat (limited to 'board/altera/common/sevenseg.c')
| -rw-r--r-- | board/altera/common/sevenseg.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/board/altera/common/sevenseg.c b/board/altera/common/sevenseg.c new file mode 100644 index 0000000..fecfbd3 --- /dev/null +++ b/board/altera/common/sevenseg.c @@ -0,0 +1,220 @@ +/* + * (C) Copyright 2003, Li-Pro.Net <www.li-pro.net> + * Stephan Linz <linz@li-pro.net> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + * common/sevenseg.c + * + * NIOS PIO based seven segment led support functions + */ + +#include <common.h> +#include <nios-io.h> + +#ifdef CONFIG_SEVENSEG + +#define SEVENDEG_MASK_DP ((SEVENSEG_DIGIT_DP << 8) | SEVENSEG_DIGIT_DP) + +#ifdef SEVENSEG_WRONLY /* emulate read access */ +#if (SEVENSEG_ACTIVE == 0) +static unsigned int sevenseg_portval = ~0; +#else +static unsigned int sevenseg_portval = 0; +#endif +#endif + +static int sevenseg_init_done = 0; + +static inline void __sevenseg_set_masked (unsigned int mask, int value) +{ + nios_pio_t *piop = (nios_pio_t*)SEVENSEG_BASE; + +#ifdef SEVENSEG_WRONLY /* emulate read access */ + +#if (SEVENSEG_ACTIVE == 0) + if (value) + sevenseg_portval &= ~mask; + else + sevenseg_portval |= mask; +#else + if (value) + sevenseg_portval |= mask; + else + sevenseg_portval &= ~mask; +#endif + + piop->data = sevenseg_portval; + +#else /* !SEVENSEG_WRONLY */ + +#if (SEVENSEG_ACTIVE == 0) + if (value) + piop->data &= ~mask; + else + piop->data |= mask; +#else + if (value) + piop->data |= mask; + else + piop->data &= ~mask; +#endif + +#endif /* SEVENSEG_WRONLY */ +} + +static inline void __sevenseg_toggle_masked (unsigned int mask) +{ + nios_pio_t *piop = (nios_pio_t*)SEVENSEG_BASE; + +#ifdef SEVENSEG_WRONLY /* emulate read access */ + + sevenseg_portval ^= mask; + piop->data = sevenseg_portval; + +#else /* !SEVENSEG_WRONLY */ + + piop->data ^= mask; + +#endif /* SEVENSEG_WRONLY */ +} + +static inline void __sevenseg_set (unsigned int value) +{ + nios_pio_t *piop = (nios_pio_t*)SEVENSEG_BASE; + +#ifdef SEVENSEG_WRONLY /* emulate read access */ + +#if (SEVENSEG_ACTIVE == 0) + sevenseg_portval = (sevenseg_portval & SEVENDEG_MASK_DP) + | ((~value) & (~SEVENDEG_MASK_DP)); +#else + sevenseg_portval = (sevenseg_portval & SEVENDEG_MASK_DP) + | (value); +#endif + + piop->data = sevenseg_portval; + +#else /* !SEVENSEG_WRONLY */ + +#if (SEVENSEG_ACTIVE == 0) + piop->data = (piop->data & SEVENDEG_MASK_DP) + | ((~value) & (~SEVENDEG_MASK_DP)); +#else + piop->data = (piop->data & SEVENDEG_MASK_DP) + | (value); +#endif + +#endif /* SEVENSEG_WRONLY */ +} + +static inline void __sevenseg_init (void) +{ + nios_pio_t *piop = (nios_pio_t*)SEVENSEG_BASE; + + __sevenseg_set(0); + +#ifndef SEVENSEG_WRONLY /* setup direction */ + + piop->direction |= mask; + +#endif /* SEVENSEG_WRONLY */ +} + + +void sevenseg_set(int value) +{ + unsigned char digits[] = { + SEVENSEG_DIGITS_0, + SEVENSEG_DIGITS_1, + SEVENSEG_DIGITS_2, + SEVENSEG_DIGITS_3, + SEVENSEG_DIGITS_4, + SEVENSEG_DIGITS_5, + SEVENSEG_DIGITS_6, + SEVENSEG_DIGITS_7, + SEVENSEG_DIGITS_8, + SEVENSEG_DIGITS_9, + SEVENSEG_DIGITS_A, + SEVENSEG_DIGITS_B, + SEVENSEG_DIGITS_C, + SEVENSEG_DIGITS_D, + SEVENSEG_DIGITS_E, + SEVENSEG_DIGITS_F + }; + + if (!sevenseg_init_done) { + __sevenseg_init(); + sevenseg_init_done++; + } + + switch (value & SEVENSEG_MASK_CTRL) { + + case SEVENSEG_RAW: + __sevenseg_set( ( + (digits[((value & SEVENSEG_MASK_VAL) >> 4)] << 8) | + digits[((value & SEVENSEG_MASK_VAL) & 0xf)] ) ); + return; + break; /* paranoia */ + + case SEVENSEG_OFF: + __sevenseg_set(0); + __sevenseg_set_masked(SEVENDEG_MASK_DP, 0); + return; + break; /* paranoia */ + + case SEVENSEG_SET_DPL: + __sevenseg_set_masked(SEVENSEG_DIGIT_DP, 1); + return; + break; /* paranoia */ + + case SEVENSEG_SET_DPH: + __sevenseg_set_masked((SEVENSEG_DIGIT_DP << 8), 1); + return; + break; /* paranoia */ + + case SEVENSEG_RES_DPL: + __sevenseg_set_masked(SEVENSEG_DIGIT_DP, 0); + return; + break; /* paranoia */ + + case SEVENSEG_RES_DPH: + __sevenseg_set_masked((SEVENSEG_DIGIT_DP << 8), 0); + return; + break; /* paranoia */ + + case SEVENSEG_TOG_DPL: + __sevenseg_toggle_masked(SEVENSEG_DIGIT_DP); + return; + break; /* paranoia */ + + case SEVENSEG_TOG_DPH: + __sevenseg_toggle_masked((SEVENSEG_DIGIT_DP << 8)); + return; + break; /* paranoia */ + + case SEVENSEG_LO: + case SEVENSEG_HI: + case SEVENSEG_STR: + default: + break; + } +} + +#endif /* CONFIG_SEVENSEG */ |