Another ADC chip, also with 8 inputs. Also has drivers in mainline Linux.
Cheers,
Andrew
From 9209db09c9b8e04becf100bd242cb38ca7ad3ca6 Mon Sep 17 00:00:00 2001
From: Andrzej Zaborowski <[EMAIL PROTECTED]>
Date: Fri, 16 Mar 2007 16:54:17 +0100
Subject: [PATCH] Maxim MAX1110/1111 ADC chip.
---
hw/max111x.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
vl.h | 7 +++
2 files changed, 145 insertions(+), 0 deletions(-)
diff --git a/hw/max111x.c b/hw/max111x.c
new file mode 100644
index 0000000..685b80a
--- /dev/null
+++ b/hw/max111x.c
@@ -0,0 +1,138 @@
+/*
+ * MAX1110/1111 ADC chip emulation.
+ *
+ * Copyright (c) 2006 Openedhand Ltd.
+ * Written by Andrzej Zaborowski <[EMAIL PROTECTED]>
+ *
+ * This code is licensed under the GPLv2.
+ */
+
+#include <vl.h>
+
+struct max111x_s {
+ void (*interrupt)(void *opaque);
+ void *opaque;
+ uint8_t tb1, rb2, rb3;
+ int cycle;
+
+ int input[8];
+ int inputs, com;
+};
+
+/* Control-byte bitfields */
+#define CB_PD0 (1 << 0)
+#define CB_PD1 (1 << 1)
+#define CB_SGL (1 << 2)
+#define CB_UNI (1 << 3)
+#define CB_SEL0 (1 << 4)
+#define CB_SEL1 (1 << 5)
+#define CB_SEL2 (1 << 6)
+#define CB_START (1 << 7)
+
+#define CHANNEL_NUM(v, b0, b1, b2) \
+ ((((v) >> (2 + (b0))) & 4) | \
+ (((v) >> (3 + (b1))) & 2) | \
+ (((v) >> (4 + (b2))) & 1))
+
+uint32_t max111x_read(void *opaque)
+{
+ struct max111x_s *s = (struct max111x_s *) opaque;
+
+ if (!s->tb1)
+ return 0;
+
+ switch (s->cycle ++) {
+ case 1:
+ return s->rb2;
+ case 2:
+ return s->rb3;
+ }
+
+ return 0;
+}
+
+/* Interpret a control-byte */
+void max111x_write(void *opaque, uint32_t value)
+{
+ struct max111x_s *s = (struct max111x_s *) opaque;
+ int measure, chan;
+
+ /* Ignore the value if START bit is zero */
+ if (!(value & CB_START))
+ return;
+
+ s->cycle = 0;
+
+ if (!(value & CB_PD1)) {
+ s->tb1 = 0;
+ return;
+ }
+
+ s->tb1 = value;
+
+ if (s->inputs == 8)
+ chan = CHANNEL_NUM(value, 1, 0, 2);
+ else
+ chan = CHANNEL_NUM(value & ~CB_SEL0, 0, 1, 2);
+
+ if (value & CB_SGL)
+ measure = s->input[chan] - s->com;
+ else
+ measure = s->input[chan] - s->input[chan ^ 1];
+
+ if (!(value & CB_UNI))
+ measure ^= 0x80;
+
+ s->rb2 = (measure >> 2) & 0x3f;
+ s->rb3 = (measure << 6) & 0xc0;
+
+ if (s->interrupt)
+ s->interrupt(s->opaque);
+}
+
+struct max111x_s *max111x_init(void (*cb)(void *opaque), void *opaque)
+{
+ struct max111x_s *s;
+ s = (struct max111x_s *)
+ qemu_mallocz(sizeof(struct max111x_s));
+ memset(s, 0, sizeof(struct max111x_s));
+
+ s->interrupt = cb;
+ s->opaque = opaque;
+
+ /* TODO: add a user interface for setting these */
+ s->input[0] = 0xf0;
+ s->input[1] = 0xe0;
+ s->input[2] = 0xd0;
+ s->input[3] = 0xc0;
+ s->input[4] = 0xb0;
+ s->input[5] = 0xa0;
+ s->input[6] = 0x90;
+ s->input[7] = 0x80;
+ s->com = 0;
+ return s;
+}
+
+struct max111x_s *max1110_init(void (*cb)(void *opaque), void *opaque)
+{
+ struct max111x_s *s = max111x_init(cb, opaque);
+ s->inputs = 8;
+ return s;
+}
+
+struct max111x_s *max1111_init(void (*cb)(void *opaque), void *opaque)
+{
+ struct max111x_s *s = max111x_init(cb, opaque);
+ s->inputs = 4;
+ return s;
+}
+
+void max111x_set_input(struct max111x_s *s, int line, uint8_t value)
+{
+ if (line >= s->inputs) {
+ printf("%s: There's no input %i\n", __FUNCTION__, line);
+ return;
+ }
+
+ s->input[line] = value;
+}
diff --git a/vl.h b/vl.h
index 2f2e340..a619ee6 100644
--- a/vl.h
+++ b/vl.h
@@ -1414,6 +1414,13 @@ uint8_t nand_getio(struct nand_flash_s *s);
#include "ecc.h"
+/* max111x.c */
+struct max111x_s;
+uint32_t max111x_read(void *opaque);
+void max111x_write(void *opaque, uint32_t value);
+struct max111x_s *max1110_init(void (*cb)(void *opaque), void *opaque);
+struct max111x_s *max1111_init(void (*cb)(void *opaque), void *opaque);
+void max111x_set_input(struct max111x_s *s, int line, uint8_t value);
/* ads7846.c */
struct ads7846_state_s;
--
1.4.4.3
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