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mavgen_c.py
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#!/usr/bin/env python
'''
parse a MAVLink protocol XML file and generate a C implementation
Copyright Andrew Tridgell 2011
Released under GNU GPL version 3 or later
'''
import sys, textwrap, os, time
from . import mavparse, mavtemplate
t = mavtemplate.MAVTemplate()
def generate_version_h(directory, xml):
'''generate version.h'''
f = open(os.path.join(directory, "version.h"), mode='w')
t.write(f,'''
/** @file
* @brief MAVLink comm protocol built from ${basename}.xml
* @see http://mavlink.org
*/
#ifndef MAVLINK_VERSION_H
#define MAVLINK_VERSION_H
#define MAVLINK_BUILD_DATE "${parse_time}"
#define MAVLINK_WIRE_PROTOCOL_VERSION "${wire_protocol_version}"
#define MAVLINK_MAX_DIALECT_PAYLOAD_SIZE ${largest_payload}
#endif // MAVLINK_VERSION_H
''', xml)
f.close()
def generate_mavlink_h(directory, xml):
'''generate mavlink.h'''
f = open(os.path.join(directory, "mavlink.h"), mode='w')
t.write(f,'''
/** @file
* @brief MAVLink comm protocol built from ${basename}.xml
* @see http://mavlink.org
*/
#ifndef MAVLINK_H
#define MAVLINK_H
#ifndef MAVLINK_STX
#define MAVLINK_STX ${protocol_marker}
#endif
#ifndef MAVLINK_ENDIAN
#define MAVLINK_ENDIAN ${mavlink_endian}
#endif
#ifndef MAVLINK_ALIGNED_FIELDS
#define MAVLINK_ALIGNED_FIELDS ${aligned_fields_define}
#endif
#ifndef MAVLINK_CRC_EXTRA
#define MAVLINK_CRC_EXTRA ${crc_extra_define}
#endif
#include "version.h"
#include "${basename}.h"
#endif // MAVLINK_H
''', xml)
f.close()
def generate_main_h(directory, xml):
'''generate main header per XML file'''
f = open(os.path.join(directory, xml.basename + ".h"), mode='w')
t.write(f, '''
/** @file
* @brief MAVLink comm protocol generated from ${basename}.xml
* @see http://mavlink.org
*/
#ifndef MAVLINK_${basename_upper}_H
#define MAVLINK_${basename_upper}_H
#ifndef MAVLINK_H
#error Wrong include order: MAVLINK_${basename_upper}.H MUST NOT BE DIRECTLY USED. Include mavlink.h from the same directory instead or set ALL AND EVERY defines from MAVLINK.H manually accordingly, including the #define MAVLINK_H call.
#endif
#ifdef __cplusplus
extern "C" {
#endif
// MESSAGE LENGTHS AND CRCS
#ifndef MAVLINK_MESSAGE_LENGTHS
#define MAVLINK_MESSAGE_LENGTHS {${message_lengths_array}}
#endif
#ifndef MAVLINK_MESSAGE_CRCS
#define MAVLINK_MESSAGE_CRCS {${message_crcs_array}}
#endif
#ifndef MAVLINK_MESSAGE_INFO
#define MAVLINK_MESSAGE_INFO {${message_info_array}}
#endif
#include "../protocol.h"
#define MAVLINK_ENABLED_${basename_upper}
// ENUM DEFINITIONS
${{enum:
/** @brief ${description} */
#ifndef HAVE_ENUM_${name}
#define HAVE_ENUM_${name}
typedef enum ${name}
{
${{entry: ${name}=${value}, /* ${description} |${{param:${description}| }} */
}}
} ${name};
#endif
}}
${{include_list:#include "../${base}/${base}.h"
}}
// MAVLINK VERSION
#ifndef MAVLINK_VERSION
#define MAVLINK_VERSION ${version}
#endif
#if (MAVLINK_VERSION == 0)
#undef MAVLINK_VERSION
#define MAVLINK_VERSION ${version}
#endif
// MESSAGE DEFINITIONS
${{message:#include "./mavlink_msg_${name_lower}.h"
}}
#ifdef __cplusplus
}
#endif // __cplusplus
#endif // MAVLINK_${basename_upper}_H
''', xml)
f.close()
def generate_message_h(directory, m):
'''generate per-message header for a XML file'''
f = open(os.path.join(directory, 'mavlink_msg_%s.h' % m.name_lower), mode='w')
t.write(f, '''
// MESSAGE ${name} PACKING
#define MAVLINK_MSG_ID_${name} ${id}
typedef struct __mavlink_${name_lower}_t
{
${{ordered_fields: ${type} ${name}${array_suffix}; ///< ${description}
}}
} mavlink_${name_lower}_t;
#define MAVLINK_MSG_ID_${name}_LEN ${wire_length}
#define MAVLINK_MSG_ID_${id}_LEN ${wire_length}
#define MAVLINK_MSG_ID_${name}_CRC ${crc_extra}
#define MAVLINK_MSG_ID_${id}_CRC ${crc_extra}
${{array_fields:#define MAVLINK_MSG_${msg_name}_FIELD_${name_upper}_LEN ${array_length}
}}
#define MAVLINK_MESSAGE_INFO_${name} { \\
"${name}", \\
${num_fields}, \\
{ ${{ordered_fields: { "${name}", ${c_print_format}, MAVLINK_TYPE_${type_upper}, ${array_length}, ${wire_offset}, offsetof(mavlink_${name_lower}_t, ${name}) }, \\
}} } \\
}
/**
* @brief Pack a ${name_lower} message
* @param system_id ID of this system
* @param component_id ID of this component (e.g. 200 for IMU)
* @param msg The MAVLink message to compress the data into
*
${{arg_fields: * @param ${name} ${description}
}}
* @return length of the message in bytes (excluding serial stream start sign)
*/
static inline uint16_t mavlink_msg_${name_lower}_pack(uint8_t system_id, uint8_t component_id, mavlink_message_t* msg,
${{arg_fields: ${array_const}${type} ${array_prefix}${name},}})
{
#if MAVLINK_NEED_BYTE_SWAP || !MAVLINK_ALIGNED_FIELDS
char buf[MAVLINK_MSG_ID_${name}_LEN];
${{scalar_fields: _mav_put_${type}(buf, ${wire_offset}, ${putname});
}}
${{array_fields: _mav_put_${type}_array(buf, ${wire_offset}, ${name}, ${array_length});
}}
memcpy(_MAV_PAYLOAD_NON_CONST(msg), buf, MAVLINK_MSG_ID_${name}_LEN);
#else
mavlink_${name_lower}_t packet;
${{scalar_fields: packet.${name} = ${putname};
}}
${{array_fields: mav_array_memcpy(packet.${name}, ${name}, sizeof(${type})*${array_length});
}}
memcpy(_MAV_PAYLOAD_NON_CONST(msg), &packet, MAVLINK_MSG_ID_${name}_LEN);
#endif
msg->msgid = MAVLINK_MSG_ID_${name};
#if MAVLINK_CRC_EXTRA
return mavlink_finalize_message(msg, system_id, component_id, MAVLINK_MSG_ID_${name}_LEN, MAVLINK_MSG_ID_${name}_CRC);
#else
return mavlink_finalize_message(msg, system_id, component_id, MAVLINK_MSG_ID_${name}_LEN);
#endif
}
/**
* @brief Pack a ${name_lower} message on a channel
* @param system_id ID of this system
* @param component_id ID of this component (e.g. 200 for IMU)
* @param chan The MAVLink channel this message will be sent over
* @param msg The MAVLink message to compress the data into
${{arg_fields: * @param ${name} ${description}
}}
* @return length of the message in bytes (excluding serial stream start sign)
*/
static inline uint16_t mavlink_msg_${name_lower}_pack_chan(uint8_t system_id, uint8_t component_id, uint8_t chan,
mavlink_message_t* msg,
${{arg_fields:${array_const}${type} ${array_prefix}${name},}})
{
#if MAVLINK_NEED_BYTE_SWAP || !MAVLINK_ALIGNED_FIELDS
char buf[MAVLINK_MSG_ID_${name}_LEN];
${{scalar_fields: _mav_put_${type}(buf, ${wire_offset}, ${putname});
}}
${{array_fields: _mav_put_${type}_array(buf, ${wire_offset}, ${name}, ${array_length});
}}
memcpy(_MAV_PAYLOAD_NON_CONST(msg), buf, MAVLINK_MSG_ID_${name}_LEN);
#else
mavlink_${name_lower}_t packet;
${{scalar_fields: packet.${name} = ${putname};
}}
${{array_fields: mav_array_memcpy(packet.${name}, ${name}, sizeof(${type})*${array_length});
}}
memcpy(_MAV_PAYLOAD_NON_CONST(msg), &packet, MAVLINK_MSG_ID_${name}_LEN);
#endif
msg->msgid = MAVLINK_MSG_ID_${name};
#if MAVLINK_CRC_EXTRA
return mavlink_finalize_message_chan(msg, system_id, component_id, chan, MAVLINK_MSG_ID_${name}_LEN, MAVLINK_MSG_ID_${name}_CRC);
#else
return mavlink_finalize_message_chan(msg, system_id, component_id, chan, MAVLINK_MSG_ID_${name}_LEN);
#endif
}
/**
* @brief Encode a ${name_lower} struct
*
* @param system_id ID of this system
* @param component_id ID of this component (e.g. 200 for IMU)
* @param msg The MAVLink message to compress the data into
* @param ${name_lower} C-struct to read the message contents from
*/
static inline uint16_t mavlink_msg_${name_lower}_encode(uint8_t system_id, uint8_t component_id, mavlink_message_t* msg, const mavlink_${name_lower}_t* ${name_lower})
{
return mavlink_msg_${name_lower}_pack(system_id, component_id, msg,${{arg_fields: ${name_lower}->${name},}});
}
/**
* @brief Encode a ${name_lower} struct on a channel
*
* @param system_id ID of this system
* @param component_id ID of this component (e.g. 200 for IMU)
* @param chan The MAVLink channel this message will be sent over
* @param msg The MAVLink message to compress the data into
* @param ${name_lower} C-struct to read the message contents from
*/
static inline uint16_t mavlink_msg_${name_lower}_encode_chan(uint8_t system_id, uint8_t component_id, uint8_t chan, mavlink_message_t* msg, const mavlink_${name_lower}_t* ${name_lower})
{
return mavlink_msg_${name_lower}_pack_chan(system_id, component_id, chan, msg,${{arg_fields: ${name_lower}->${name},}});
}
/**
* @brief Send a ${name_lower} message
* @param chan MAVLink channel to send the message
*
${{arg_fields: * @param ${name} ${description}
}}
*/
#ifdef MAVLINK_USE_CONVENIENCE_FUNCTIONS
static inline void mavlink_msg_${name_lower}_send(mavlink_channel_t chan,${{arg_fields: ${array_const}${type} ${array_prefix}${name},}})
{
#if MAVLINK_NEED_BYTE_SWAP || !MAVLINK_ALIGNED_FIELDS
char buf[MAVLINK_MSG_ID_${name}_LEN];
${{scalar_fields: _mav_put_${type}(buf, ${wire_offset}, ${putname});
}}
${{array_fields: _mav_put_${type}_array(buf, ${wire_offset}, ${name}, ${array_length});
}}
#if MAVLINK_CRC_EXTRA
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, buf, MAVLINK_MSG_ID_${name}_LEN, MAVLINK_MSG_ID_${name}_CRC);
#else
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, buf, MAVLINK_MSG_ID_${name}_LEN);
#endif
#else
mavlink_${name_lower}_t packet;
${{scalar_fields: packet.${name} = ${putname};
}}
${{array_fields: mav_array_memcpy(packet.${name}, ${name}, sizeof(${type})*${array_length});
}}
#if MAVLINK_CRC_EXTRA
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, (const char *)&packet, MAVLINK_MSG_ID_${name}_LEN, MAVLINK_MSG_ID_${name}_CRC);
#else
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, (const char *)&packet, MAVLINK_MSG_ID_${name}_LEN);
#endif
#endif
}
#if MAVLINK_MSG_ID_${name}_LEN <= MAVLINK_MAX_PAYLOAD_LEN
/*
This varient of _send() can be used to save stack space by re-using
memory from the receive buffer. The caller provides a
mavlink_message_t which is the size of a full mavlink message. This
is usually the receive buffer for the channel, and allows a reply to an
incoming message with minimum stack space usage.
*/
static inline void mavlink_msg_${name_lower}_send_buf(mavlink_message_t *msgbuf, mavlink_channel_t chan, ${{arg_fields: ${array_const}${type} ${array_prefix}${name},}})
{
#if MAVLINK_NEED_BYTE_SWAP || !MAVLINK_ALIGNED_FIELDS
char *buf = (char *)msgbuf;
${{scalar_fields: _mav_put_${type}(buf, ${wire_offset}, ${putname});
}}
${{array_fields: _mav_put_${type}_array(buf, ${wire_offset}, ${name}, ${array_length});
}}
#if MAVLINK_CRC_EXTRA
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, buf, MAVLINK_MSG_ID_${name}_LEN, MAVLINK_MSG_ID_${name}_CRC);
#else
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, buf, MAVLINK_MSG_ID_${name}_LEN);
#endif
#else
mavlink_${name_lower}_t *packet = (mavlink_${name_lower}_t *)msgbuf;
${{scalar_fields: packet->${name} = ${putname};
}}
${{array_fields: mav_array_memcpy(packet->${name}, ${name}, sizeof(${type})*${array_length});
}}
#if MAVLINK_CRC_EXTRA
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, (const char *)packet, MAVLINK_MSG_ID_${name}_LEN, MAVLINK_MSG_ID_${name}_CRC);
#else
_mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_${name}, (const char *)packet, MAVLINK_MSG_ID_${name}_LEN);
#endif
#endif
}
#endif
#endif
// MESSAGE ${name} UNPACKING
${{fields:
/**
* @brief Get field ${name} from ${name_lower} message
*
* @return ${description}
*/
static inline ${return_type} mavlink_msg_${name_lower}_get_${name}(const mavlink_message_t* msg${get_arg})
{
return _MAV_RETURN_${type}${array_tag}(msg, ${array_return_arg} ${wire_offset});
}
}}
/**
* @brief Decode a ${name_lower} message into a struct
*
* @param msg The message to decode
* @param ${name_lower} C-struct to decode the message contents into
*/
static inline void mavlink_msg_${name_lower}_decode(const mavlink_message_t* msg, mavlink_${name_lower}_t* ${name_lower})
{
#if MAVLINK_NEED_BYTE_SWAP
${{ordered_fields: ${decode_left}mavlink_msg_${name_lower}_get_${name}(msg${decode_right});
}}
#else
memcpy(${name_lower}, _MAV_PAYLOAD(msg), MAVLINK_MSG_ID_${name}_LEN);
#endif
}
''', m)
f.close()
def generate_testsuite_h(directory, xml):
'''generate testsuite.h per XML file'''
f = open(os.path.join(directory, "testsuite.h"), mode='w')
t.write(f, '''
/** @file
* @brief MAVLink comm protocol testsuite generated from ${basename}.xml
* @see http://qgroundcontrol.org/mavlink/
*/
#ifndef ${basename_upper}_TESTSUITE_H
#define ${basename_upper}_TESTSUITE_H
#ifdef __cplusplus
extern "C" {
#endif
#ifndef MAVLINK_TEST_ALL
#define MAVLINK_TEST_ALL
${{include_list:static void mavlink_test_${base}(uint8_t, uint8_t, mavlink_message_t *last_msg);
}}
static void mavlink_test_${basename}(uint8_t, uint8_t, mavlink_message_t *last_msg);
static void mavlink_test_all(uint8_t system_id, uint8_t component_id, mavlink_message_t *last_msg)
{
${{include_list: mavlink_test_${base}(system_id, component_id, last_msg);
}}
mavlink_test_${basename}(system_id, component_id, last_msg);
}
#endif
${{include_list:#include "../${base}/testsuite.h"
}}
${{message:
static void mavlink_test_${name_lower}(uint8_t system_id, uint8_t component_id, mavlink_message_t *last_msg)
{
mavlink_message_t msg;
uint8_t buffer[MAVLINK_MAX_PACKET_LEN];
uint16_t i;
mavlink_${name_lower}_t packet_in = {
${{ordered_fields:${c_test_value},}}
};
mavlink_${name_lower}_t packet1, packet2;
memset(&packet1, 0, sizeof(packet1));
${{scalar_fields: packet1.${name} = packet_in.${name};
}}
${{array_fields: mav_array_memcpy(packet1.${name}, packet_in.${name}, sizeof(${type})*${array_length});
}}
memset(&packet2, 0, sizeof(packet2));
mavlink_msg_${name_lower}_encode(system_id, component_id, &msg, &packet1);
mavlink_msg_${name_lower}_decode(&msg, &packet2);
MAVLINK_ASSERT(memcmp(&packet1, &packet2, sizeof(packet1)) == 0);
memset(&packet2, 0, sizeof(packet2));
mavlink_msg_${name_lower}_pack(system_id, component_id, &msg ${{arg_fields:, packet1.${name} }});
mavlink_msg_${name_lower}_decode(&msg, &packet2);
MAVLINK_ASSERT(memcmp(&packet1, &packet2, sizeof(packet1)) == 0);
memset(&packet2, 0, sizeof(packet2));
mavlink_msg_${name_lower}_pack_chan(system_id, component_id, MAVLINK_COMM_0, &msg ${{arg_fields:, packet1.${name} }});
mavlink_msg_${name_lower}_decode(&msg, &packet2);
MAVLINK_ASSERT(memcmp(&packet1, &packet2, sizeof(packet1)) == 0);
memset(&packet2, 0, sizeof(packet2));
mavlink_msg_to_send_buffer(buffer, &msg);
for (i=0; i<mavlink_msg_get_send_buffer_length(&msg); i++) {
comm_send_ch(MAVLINK_COMM_0, buffer[i]);
}
mavlink_msg_${name_lower}_decode(last_msg, &packet2);
MAVLINK_ASSERT(memcmp(&packet1, &packet2, sizeof(packet1)) == 0);
memset(&packet2, 0, sizeof(packet2));
mavlink_msg_${name_lower}_send(MAVLINK_COMM_1 ${{arg_fields:, packet1.${name} }});
mavlink_msg_${name_lower}_decode(last_msg, &packet2);
MAVLINK_ASSERT(memcmp(&packet1, &packet2, sizeof(packet1)) == 0);
}
}}
static void mavlink_test_${basename}(uint8_t system_id, uint8_t component_id, mavlink_message_t *last_msg)
{
${{message: mavlink_test_${name_lower}(system_id, component_id, last_msg);
}}
}
#ifdef __cplusplus
}
#endif // __cplusplus
#endif // ${basename_upper}_TESTSUITE_H
''', xml)
f.close()
def copy_fixed_headers(directory, xml):
'''copy the fixed protocol headers to the target directory'''
import shutil
hlist = [ 'protocol.h', 'mavlink_helpers.h', 'mavlink_types.h', 'checksum.h', 'mavlink_conversions.h' ]
basepath = os.path.dirname(os.path.realpath(__file__))
srcpath = os.path.join(basepath, 'C/include_v%s' % xml.wire_protocol_version)
print("Copying fixed headers")
for h in hlist:
if (not ((h == 'mavlink_conversions.h') and xml.wire_protocol_version == '0.9')):
src = os.path.realpath(os.path.join(srcpath, h))
dest = os.path.realpath(os.path.join(directory, h))
if src == dest:
continue
shutil.copy(src, dest)
class mav_include(object):
def __init__(self, base):
self.base = base
def generate_one(basename, xml):
'''generate headers for one XML file'''
directory = os.path.join(basename, xml.basename)
print("Generating C implementation in directory %s" % directory)
mavparse.mkdir_p(directory)
if xml.little_endian:
xml.mavlink_endian = "MAVLINK_LITTLE_ENDIAN"
else:
xml.mavlink_endian = "MAVLINK_BIG_ENDIAN"
if xml.crc_extra:
xml.crc_extra_define = "1"
else:
xml.crc_extra_define = "0"
if xml.sort_fields:
xml.aligned_fields_define = "1"
else:
xml.aligned_fields_define = "0"
# work out the included headers
xml.include_list = []
for i in xml.include:
base = i[:-4]
xml.include_list.append(mav_include(base))
# form message lengths array
xml.message_lengths_array = ''
for mlen in xml.message_lengths:
xml.message_lengths_array += '%u, ' % mlen
xml.message_lengths_array = xml.message_lengths_array[:-2]
# and message CRCs array
xml.message_crcs_array = ''
for crc in xml.message_crcs:
xml.message_crcs_array += '%u, ' % crc
xml.message_crcs_array = xml.message_crcs_array[:-2]
# form message info array
xml.message_info_array = ''
for name in xml.message_names:
if name is not None:
xml.message_info_array += 'MAVLINK_MESSAGE_INFO_%s, ' % name
else:
# Several C compilers don't accept {NULL} for
# multi-dimensional arrays and structs
# feed the compiler a "filled" empty message
xml.message_info_array += '{"EMPTY",0,{{"","",MAVLINK_TYPE_CHAR,0,0,0}}}, '
xml.message_info_array = xml.message_info_array[:-2]
# add some extra field attributes for convenience with arrays
for m in xml.message:
m.msg_name = m.name
if xml.crc_extra:
m.crc_extra_arg = ", %s" % m.crc_extra
else:
m.crc_extra_arg = ""
for f in m.fields:
if f.print_format is None:
f.c_print_format = 'NULL'
else:
f.c_print_format = '"%s"' % f.print_format
if f.array_length != 0:
f.array_suffix = '[%u]' % f.array_length
f.array_prefix = '*'
f.array_tag = '_array'
f.array_arg = ', %u' % f.array_length
f.array_return_arg = '%s, %u, ' % (f.name, f.array_length)
f.array_const = 'const '
f.decode_left = ''
f.decode_right = ', %s->%s' % (m.name_lower, f.name)
f.return_type = 'uint16_t'
f.get_arg = ', %s *%s' % (f.type, f.name)
if f.type == 'char':
f.c_test_value = '"%s"' % f.test_value
else:
test_strings = []
for v in f.test_value:
test_strings.append(str(v))
f.c_test_value = '{ %s }' % ', '.join(test_strings)
else:
f.array_suffix = ''
f.array_prefix = ''
f.array_tag = ''
f.array_arg = ''
f.array_return_arg = ''
f.array_const = ''
f.decode_left = "%s->%s = " % (m.name_lower, f.name)
f.decode_right = ''
f.get_arg = ''
f.return_type = f.type
if f.type == 'char':
f.c_test_value = "'%s'" % f.test_value
elif f.type == 'uint64_t':
f.c_test_value = "%sULL" % f.test_value
elif f.type == 'int64_t':
f.c_test_value = "%sLL" % f.test_value
else:
f.c_test_value = f.test_value
# cope with uint8_t_mavlink_version
for m in xml.message:
m.arg_fields = []
m.array_fields = []
m.scalar_fields = []
for f in m.ordered_fields:
if f.array_length != 0:
m.array_fields.append(f)
else:
m.scalar_fields.append(f)
for f in m.fields:
if not f.omit_arg:
m.arg_fields.append(f)
f.putname = f.name
else:
f.putname = f.const_value
generate_mavlink_h(directory, xml)
generate_version_h(directory, xml)
generate_main_h(directory, xml)
for m in xml.message:
generate_message_h(directory, m)
generate_testsuite_h(directory, xml)
def generate(basename, xml_list):
'''generate complete MAVLink C implemenation'''
for xml in xml_list:
generate_one(basename, xml)
copy_fixed_headers(basename, xml_list[0])