Patches by Stephan Linz, 11 Dec 2003:
- more documentation for NIOS port
- new struct nios_pio_t, struct nios_spi_t
- Reconfiguration for NIOS Development Kit DK1C20:
o move board related code from board/dk1c20
to board/altera/dk1c20
o create a new common source path board/altera/common
and move generic flash access stuff into it
o change/expand configuration file DK1C20.h
- Add support for NIOS Development Kit DK1S10
- Add status LED support for NIOS systems
- Add dual 7-segment LED support for Altera NIOS DevKits
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 */