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-rw-r--r--trunk/src/emu/machine/rescap.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/rescap.h b/trunk/src/emu/machine/rescap.h
new file mode 100644
index 00000000000..afac4713f8c
--- /dev/null
+++ b/trunk/src/emu/machine/rescap.h
@@ -0,0 +1,23 @@
+#ifndef RC_MACROS_H
+#define RC_MACROS_H
+
+/* Little helpers for magnitude conversions */
+#define RES_R(res) ((double)(res))
+#define RES_K(res) ((double)(res) * 1e3)
+#define RES_M(res) ((double)(res) * 1e6)
+#define CAP_U(cap) ((double)(cap) * 1e-6)
+#define CAP_N(cap) ((double)(cap) * 1e-9)
+#define CAP_P(cap) ((double)(cap) * 1e-12)
+
+/* vin --/\r1/\-- out --/\r2/\-- gnd */
+#define RES_VOLTAGE_DIVIDER(r1, r2) ((double)(r2) / ((double)(r1) + (double)(r2)))
+
+#define RES_2_PARALLEL(r1, r2) (((r1) * (r2)) / ((r1) + (r2)))
+#define RES_3_PARALLEL(r1, r2, r3) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3)))
+#define RES_4_PARALLEL(r1, r2, r3, r4) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3) + 1.0 / (r4)))
+#define RES_5_PARALLEL(r1, r2, r3, r4, r5) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3) + 1.0 / (r4) + 1.0 / (r5)))
+#define RES_6_PARALLEL(r1, r2, r3, r4, r5, r6) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3) + 1.0 / (r4) + 1.0 / (r5) + 1.0 / (r6)))
+
+#define RES_2_SERIAL(r1,r2) ((r1)+(r2))
+
+#endif