Mock out mgos_i2c.h to work with Linux.

include/mgos.h

@@ -0,0 +1,14 @@
+#ifndef __MGOS_H
+#define __MGOS_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "mgos_mock.h"
+
+#endif // __MGOS_H

include/mgos_i2c.h

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2015 Cesanta
+ * All rights reserved
+ */
+
+/*
+ * I2C API.
+ *
+ * See https://en.wikipedia.org/wiki/I%C2%B2C for the background information.
+ */
+
+#pragma once
+
+#include "mgos.h"
+
+/* Each platform defines its own I2C connection parameters. */
+struct mgos_i2c;
+
+/* If this special address is passed to read or write, START is not generated
+ * and address is not put on the bus. It is assumed that this is a continuation
+ * of a previous operation which (after read or write with stop = false). */
+#define MGOS_I2C_ADDR_CONTINUE ((uint16_t) -1)
+
+/*
+ * Read specified number of bytes from the specified address.
+ * Address should not include the R/W bit. If addr is -1, START is not
+ * performed.
+ * If |stop| is true, then at the end of the operation bus will be released.
+ */
+bool mgos_i2c_read(struct mgos_i2c *i2c, uint16_t addr, void *data, size_t len,
+                   bool stop);
+
+/*
+ * Write specified number of bytes from the specified address.
+ * Address should not include the R/W bit. If addr is -1, START is not
+ * performed.
+ * If |stop| is true, then at the end of the operation bus will be released.
+ */
+bool mgos_i2c_write(struct mgos_i2c *i2c, uint16_t addr, const void *data,
+                    size_t len, bool stop);
+
+/*
+ * Release the bus (when left unreleased after read or write).
+ */
+void mgos_i2c_stop(struct mgos_i2c *i2c);
+
+/* Most implementations should support these two, support for other frequencies
+ * is platform-dependent. */
+#define MGOS_I2C_FREQ_100KHZ 100000
+#define MGOS_I2C_FREQ_400KHZ 400000
+
+/*
+ * Get I2C interface frequency.
+ */
+int mgos_i2c_get_freq(struct mgos_i2c *i2c);
+
+/*
+ * Set I2C interface frequency.
+ */
+bool mgos_i2c_set_freq(struct mgos_i2c *i2c, int freq);
+
+/*
+ * Helper for reading 1-byte register `reg` from a device at address `addr`.
+ * In case of success return a numeric byte value from 0x00 to 0xff; otherwise
+ * return -1.
+ */
+int mgos_i2c_read_reg_b(struct mgos_i2c *conn, uint16_t addr, uint8_t reg);
+
+/*
+ * Helper for reading 2-byte register `reg` from a device at address `addr`.
+ * In case of success returns a numeric big-endian value: e.g. if 0x01, 0x02
+ * was read from a device, 0x0102 will be returned.
+ *
+ * In case of error returns -1.
+ */
+int mgos_i2c_read_reg_w(struct mgos_i2c *conn, uint16_t addr, uint8_t reg);
+
+/*
+ * Helper for reading `n`-byte register value from a device. Returns true on
+ * success, false on error. Data is written to `buf`, which should be large
+ * enough.
+ */
+bool mgos_i2c_read_reg_n(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
+                         size_t n, uint8_t *buf);
+
+/*
+ * Helper for writing 1-byte register `reg` to a device at address `addr`.
+ * Returns `true` in case of success, `false` otherwise.
+ */
+bool mgos_i2c_write_reg_b(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
+                          uint8_t value);
+
+/*
+ * Helper for writing 2-byte register `reg` to a device at address `addr`.
+ * The value is big-endian: e.g. if `value` is `0x0102`, then `0x01, 0x02`
+ * will be written.
+ * Returns `true` in case of success, `false` otherwise.
+ */
+bool mgos_i2c_write_reg_w(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
+                          uint16_t value);
+
+/*
+ * Helper for writing `n`-byte register `reg` to a device at address `addr`.
+ * Returns `true` in case of success, `false` otherwise.
+ */
+bool mgos_i2c_write_reg_n(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
+                          size_t n, const uint8_t *buf);
+
+/* Close i2c connection and free resources. */
+void mgos_i2c_close(struct mgos_i2c *conn);
+
+/* Return i2c bus handle that is set up via the sysconfig. */
+struct mgos_i2c *mgos_i2c_get_global(void);
+
+// User contributed!
+bool mgos_i2c_open(int busnr);
+

include/mgos_mock.h

@@ -0,0 +1,35 @@
+#ifndef __MGOS_MOCK_H
+#define __MGOS_MOCK_H
+
+/* Some functions mocked from MGOS, so we can run unit tests standalone.
+ */
+
+#include "mgos.h"
+#include <time.h>
+#include <sys/time.h>
+
+// mgos_log
+enum cs_log_level {
+  LL_NONE = -1,
+  LL_ERROR = 0,
+  LL_WARN = 1,
+  LL_INFO = 2,
+  LL_DEBUG = 3,
+  LL_VERBOSE_DEBUG = 4,
+
+  _LL_MIN = -2,
+  _LL_MAX = 5,
+};
+
+int log_print_prefix(enum cs_log_level l, const char *func, const char *file);
+
+#define LOG(l, x)                                                    \
+  do {                                                               \
+    if (log_print_prefix(l, __func__, __FILE__)) printf x; \
+    printf("\r\n"); \
+  } while (0)
+
+
+float mg_time();
+
+#endif // __MGOS_MOCK_H