CMOS digital logic emulation objects

svn path=/trunk/externals/mrpeach/; revision=7509

1 files changed, 125 insertions, 0 deletions

diff --git a/cmos/cd4024.c b/cmos/cd4024.c
new file mode 100755
index 0000000..93c3bf4
--- /dev/null
+++ b/cmos/cd4024.c
@@ -0,0 +1,125 @@
+/* cd4024.c MP 20070319 */
+/* Emulate a cd4024b */
+#include "m_pd.h"
+
+typedef struct _cd4024
+{
+    t_object        x_obj;
+    t_int           x_reset;
+    t_int           x_clock;
+    t_int           x_count;
+    t_int           x_updating;
+    t_outlet        *x_Q1;
+    t_outlet        *x_Q2;
+    t_outlet        *x_Q3;
+    t_outlet        *x_Q4;
+    t_outlet        *x_Q5;
+    t_outlet        *x_Q6;
+    t_outlet        *x_Q7;
+    t_inlet         *x_resetIn;/* reset */
+    /* The main inlet (clcok) should accept a bang or a one as valid clocks. */
+    /* If a one is received, it must be followed by a zero before the clock will work again. */
+} t_cd4024;
+
+static t_class *cd4024_class;
+
+void cd4024_setup(void);
+static void *cd4024_new(t_symbol *s, int argc, t_atom *argv);
+static void cd4024_free(t_cd4024 *x);
+static void cd4024_bang(t_cd4024 *x);
+static void cd4024_float(t_cd4024 *x, t_float f);
+static void cd4024_reset(t_cd4024 *x, t_float f);
+static void cd4024_update_outlets(t_cd4024 *x);
+
+static void cd4024_float(t_cd4024 *x, t_float f)
+{
+    if (f == 0)
+    { /* if clock is low and was high, clock it. */
+        if (x->x_clock == 1)
+        {
+            x->x_clock = 0;
+            cd4024_bang(x);
+        }
+    }
+    else if (f == 1) x->x_clock = 1;
+    else post("cd4024 clock accepts bang, 1 or 0.");
+}
+
+static void cd4024_bang(t_cd4024 *x)
+{
+    if (x->x_reset == 0)
+    { /* if reset is low, clock forward */
+        x->x_count = (x->x_count + 1)%128;
+        cd4024_update_outlets(x);
+    }
+}
+
+static void cd4024_reset(t_cd4024 *x, t_float f)
+{
+    if (f == 1)
+    {
+        x->x_count = 0;
+        x->x_reset = 1;
+        if (x->x_updating != 0) x->x_updating |= 2;
+        else cd4024_update_outlets(x);
+    }
+    else if (f == 0) x->x_reset = 0;
+}
+
+static void cd4024_update_outlets(t_cd4024 *x)
+{
+reset:
+    x->x_updating = 1;/* updating outlets */
+    outlet_float(x->x_Q7, ((x->x_count & 64) != 0)?1:0);
+/* we might get reset as a result of feedback from one of these outlets. */
+    if ((x->x_updating & 2) != 0) goto reset;
+    outlet_float(x->x_Q6, ((x->x_count & 32) != 0)?1:0);
+    if ((x->x_updating & 2) != 0) goto reset;
+    outlet_float(x->x_Q5, ((x->x_count & 16) != 0)?1:0);
+    if ((x->x_updating & 2) != 0) goto reset;
+    outlet_float(x->x_Q4, ((x->x_count & 8) != 0)?1:0);
+    if ((x->x_updating & 2) != 0) goto reset;
+    outlet_float(x->x_Q3, ((x->x_count & 4) != 0)?1:0);
+    if ((x->x_updating & 2) != 0) goto reset;
+    outlet_float(x->x_Q2, ((x->x_count & 2) != 0)?1:0);
+    if ((x->x_updating & 2) != 0) goto reset;
+    outlet_float(x->x_Q1, ((x->x_count & 1) != 0)?1:0);
+    if ((x->x_updating & 2) != 0) goto reset;
+    x->x_updating = 0; /* finished updating outlets */
+}
+
+static void cd4024_free(t_cd4024 *x)
+{
+    return;
+}
+
+static void *cd4024_new(t_symbol *s, int argc, t_atom *argv)
+{
+    t_cd4024           *x;
+
+    x = (t_cd4024 *)pd_new(cd4024_class);
+    if (x == NULL) return (x);
+    x->x_Q1 = outlet_new((t_object *)x, &s_float);
+    x->x_Q2 = outlet_new((t_object *)x, &s_float);
+    x->x_Q3 = outlet_new((t_object *)x, &s_float);
+    x->x_Q4 = outlet_new((t_object *)x, &s_float);
+    x->x_Q5 = outlet_new((t_object *)x, &s_float);
+    x->x_Q6 = outlet_new((t_object *)x, &s_float);
+    x->x_Q7 = outlet_new((t_object *)x, &s_float);
+    x->x_resetIn = inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("reset"));
+
+    return (x);
+}
+
+void cd4024_setup(void)
+{
+    cd4024_class = class_new(gensym("cd4024"),
+                    (t_newmethod)cd4024_new,
+                    (t_method)cd4024_free,
+                    sizeof(t_cd4024), 0, 0); /* no arguments */
+    class_addbang(cd4024_class, cd4024_bang);
+    class_addfloat(cd4024_class, cd4024_float);
+    class_addmethod(cd4024_class, (t_method)cd4024_reset, gensym("reset"), A_FLOAT, 0);
+}
+/* end cd4024.c */
+