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ardupilot/libraries/AP_Common/AP_Param.cpp

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
//
// This is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.
//
// total up and check overflow
// check size of group var_info
/// @file AP_Param.cpp
/// @brief The AP variable store.
#include <AP_Common.h>
#include <math.h>
#include <string.h>
#include <FastSerial.h>
// #define ENABLE_FASTSERIAL_DEBUG
#ifdef ENABLE_FASTSERIAL_DEBUG
# define serialDebug(fmt, args...) if (FastSerial::getInitialized(0)) do {Serial.printf("%s:%d: " fmt "\n", __FUNCTION__, __LINE__ , ##args); delay(0); } while(0)
#else
# define serialDebug(fmt, args...)
#endif
// Static member variables for AP_Param.
//
// max EEPROM write size. This is usually less than the physical
// size as only part of the EEPROM is reserved for parameters
uint16_t AP_Param::_eeprom_size;
// number of rows in the _var_info[] table
uint16_t AP_Param::_num_vars;
// storage and naming information about all types that can be saved
const AP_Param::Info *AP_Param::_var_info;
// write to EEPROM, checking each byte to avoid writing
// bytes that are already correct
void AP_Param::eeprom_write_check(const void *ptr, uint16_t ofs, uint8_t size)
{
const uint8_t *b = (const uint8_t *)ptr;
while (size--) {
uint8_t v = eeprom_read_byte((const uint8_t *)ofs);
if (v != *b) {
eeprom_write_byte((uint8_t *)ofs, *b);
}
b++;
ofs++;
}
}
// write a sentinal value at the given offset
void AP_Param::write_sentinal(uint16_t ofs)
{
struct Param_header phdr;
phdr.type = AP_PARAM_NONE;
phdr.key = 0;
phdr.group_element = 0;
eeprom_write_check(&phdr, ofs, sizeof(phdr));
}
// erase all EEPROM variables by re-writing the header and adding
// a sentinal
void AP_Param::erase_all(void)
{
struct EEPROM_header hdr;
serialDebug("erase_all");
// write the header
hdr.magic = k_EEPROM_magic;
hdr.revision = k_EEPROM_revision;
hdr.spare = 0;
eeprom_write_check(&hdr, 0, sizeof(hdr));
// add a sentinal directly after the header
write_sentinal(sizeof(struct EEPROM_header));
}
// validate a group info table
bool AP_Param::check_group_info(const struct AP_Param::GroupInfo *group_info,
uint16_t *total_size,
uint8_t group_shift)
{
uint8_t type;
for (uint8_t i=0;
(type=pgm_read_byte(&group_info[i].type)) != AP_PARAM_NONE;
i++) {
if (type == AP_PARAM_GROUP) {
// a nested group
const struct GroupInfo *ginfo = (const struct GroupInfo *)pgm_read_pointer(&group_info[i].group_info);
if (group_shift + _group_level_shift >= _group_bits) {
// double nesting of groups is not allowed
return false;
}
if (ginfo == NULL ||
!check_group_info(ginfo, total_size, group_shift + _group_level_shift)) {
return false;
}
continue;
}
if (type == AP_PARAM_SPARE) {
// a placeholder for a removed entry
continue;
}
if (i >= (1<<_group_level_shift)) {
// passed limit on table size
return false;
}
uint8_t size = type_size((enum ap_var_type)type);
if (size == 0) {
// not a valid type
return false;
}
(*total_size) += size + sizeof(struct Param_header);
}
return true;
}
// validate the _var_info[] table
bool AP_Param::check_var_info(void)
{
uint16_t total_size = sizeof(struct EEPROM_header);
for (uint16_t i=0; i<_num_vars; i++) {
uint8_t type = pgm_read_byte(&_var_info[i].type);
if (type == AP_PARAM_GROUP) {
if (i == 0) {
// first element can't be a group, for first() call
return false;
}
const struct GroupInfo *group_info = (const struct GroupInfo *)pgm_read_pointer(&_var_info[i].group_info);
if (group_info == NULL ||
!check_group_info(group_info, &total_size, 0)) {
return false;
}
} else {
uint8_t size = type_size((enum ap_var_type)type);
if (size == 0) {
// not a valid type - the top level list can't contain AP_PARAM_NONE
return false;
}
total_size += size + sizeof(struct Param_header);
}
}
if (total_size > _eeprom_size) {
serialDebug("total_size %u exceeds _eeprom_size %u",
total_size, _eeprom_size);
return false;
}
return true;
}
// setup the _var_info[] table
bool AP_Param::setup(const AP_Param::Info *info, uint16_t num_vars, uint16_t eeprom_size)
{
struct EEPROM_header hdr;
_eeprom_size = eeprom_size;
_var_info = info;
_num_vars = num_vars;
if (!check_var_info()) {
return false;
}
serialDebug("setup %u vars", (unsigned)num_vars);
// check the header
eeprom_read_block(&hdr, 0, sizeof(hdr));
if (hdr.magic != k_EEPROM_magic ||
hdr.revision != k_EEPROM_revision) {
// header doesn't match. We can't recover any variables. Wipe
// the header and setup the sentinal directly after the header
serialDebug("bad header in setup - erasing");
erase_all();
}
return true;
}
#define GROUP_OFFSET(base, i, shift) ((base)+(((uint16_t)i)<<(shift)))
// find the info structure given a header and a group_info table
// return the Info structure and a pointer to the variables storage
const struct AP_Param::Info *AP_Param::find_by_header_group(struct Param_header phdr, void **ptr,
uint8_t vindex,
const struct GroupInfo *group_info,
uint8_t group_base,
uint8_t group_shift)
{
uint8_t type;
for (uint8_t i=0;
(type=pgm_read_byte(&group_info[i].type)) != AP_PARAM_NONE;
i++) {
if (type == AP_PARAM_GROUP) {
// a nested group
if (group_shift + _group_level_shift >= _group_bits) {
// too deeply nested - this should have been caught by
// setup() !
return NULL;
}
const struct GroupInfo *ginfo = (const struct GroupInfo *)pgm_read_pointer(&group_info[i].group_info);
const struct AP_Param::Info *ret = find_by_header_group(phdr, ptr, vindex, ginfo,
GROUP_OFFSET(group_base, i, group_shift),
group_shift + _group_level_shift);
if (ret != NULL) {
return ret;
}
continue;
}
if (type == AP_PARAM_SPARE) {
continue;
}
if (GROUP_OFFSET(group_base, i, group_shift) == phdr.group_element) {
// found a group element
*ptr = (void*)(pgm_read_pointer(&_var_info[vindex].ptr) + pgm_read_word(&group_info[i].offset));
return &_var_info[vindex];
}
}
return NULL;
}
// find the info structure given a header
// return the Info structure and a pointer to the variables storage
const struct AP_Param::Info *AP_Param::find_by_header(struct Param_header phdr, void **ptr)
{
// loop over all named variables
for (uint16_t i=0; i<_num_vars; i++) {
uint8_t type = pgm_read_byte(&_var_info[i].type);
uint16_t key = pgm_read_word(&_var_info[i].key);
if (key != phdr.key) {
// not the right key
continue;
}
if (type != AP_PARAM_GROUP) {
// if its not a group then we are done
*ptr = (void*)pgm_read_pointer(&_var_info[i].ptr);
return &_var_info[i];
}
const struct GroupInfo *group_info = (const struct GroupInfo *)pgm_read_pointer(&_var_info[i].group_info);
return find_by_header_group(phdr, ptr, i, group_info, 0, 0);
}
return NULL;
}
// find the info structure for a variable in a group
const struct AP_Param::Info *AP_Param::find_var_info_group(const struct GroupInfo *group_info,
uint8_t vindex,
uint8_t group_base,
uint8_t group_shift,
uint8_t *group_element,
const struct GroupInfo **group_ret)
{
uintptr_t base = pgm_read_pointer(&_var_info[vindex].ptr);
uint8_t type;
for (uint8_t i=0;
(type=pgm_read_byte(&group_info[i].type)) != AP_PARAM_NONE;
i++) {
if (type == AP_PARAM_GROUP) {
const struct GroupInfo *ginfo = (const struct GroupInfo *)pgm_read_pointer(&group_info[i].group_info);
// a nested group
if (group_shift + _group_level_shift >= _group_bits) {
// too deeply nested - this should have been caught by
// setup() !
return NULL;
}
const struct AP_Param::Info *info;
info = find_var_info_group(ginfo, vindex,
GROUP_OFFSET(group_base, i, group_shift),
group_shift + _group_level_shift,
group_element,
group_ret);
if (info != NULL) {
return info;
}
} else if ((uintptr_t)this == base + pgm_read_pointer(&group_info[i].offset)) {
*group_element = GROUP_OFFSET(group_base, i, group_shift);
*group_ret = &group_info[i];
return &_var_info[vindex];
}
}
return NULL;
}
// find the info structure for a variable
const struct AP_Param::Info *AP_Param::find_var_info(uint8_t *group_element,
const struct GroupInfo **group_ret)
{
for (uint16_t i=0; i<_num_vars; i++) {
uint8_t type = pgm_read_byte(&_var_info[i].type);
uintptr_t base = pgm_read_pointer(&_var_info[i].ptr);
if (type == AP_PARAM_GROUP) {
const struct GroupInfo *group_info = (const struct GroupInfo *)pgm_read_pointer(&_var_info[i].group_info);
const struct AP_Param::Info *info;
info = find_var_info_group(group_info, i, 0, 0, group_element, group_ret);
if (info != NULL) {
return info;
}
} else if (base == (uintptr_t)this) {
*group_element = 0;
*group_ret = NULL;
return &_var_info[i];
}
}
return NULL;
}
// return the storage size for a AP_PARAM_* type
const uint8_t AP_Param::type_size(enum ap_var_type type)
{
switch (type) {
case AP_PARAM_NONE:
case AP_PARAM_SPARE:
case AP_PARAM_GROUP:
return 0;
case AP_PARAM_INT8:
return 1;
case AP_PARAM_INT16:
return 2;
case AP_PARAM_INT32:
return 4;
case AP_PARAM_FLOAT:
return 4;
case AP_PARAM_VECTOR3F:
return 3*4;
case AP_PARAM_VECTOR6F:
return 6*4;
case AP_PARAM_MATRIX3F:
return 3*3*4;
}
serialDebug("unknown type %u\n", type);
return 0;
}
// scan the EEPROM looking for a given variable by header content
// return true if found, along with the offset in the EEPROM where
// the variable is stored
// if not found return the offset of the sentinal, or
bool AP_Param::scan(const AP_Param::Param_header *target, uint16_t *pofs)
{
struct Param_header phdr;
uint16_t ofs = sizeof(AP_Param::EEPROM_header);
while (ofs < _eeprom_size) {
eeprom_read_block(&phdr, (const void *)ofs, sizeof(phdr));
if (phdr.type == target->type &&
phdr.key == target->key &&
phdr.group_element == target->group_element) {
// found it
*pofs = ofs;
return true;
}
if (phdr.type == AP_PARAM_NONE &&
phdr.key == 0) {
// we've reached the sentinal
*pofs = ofs;
return false;
}
ofs += type_size((enum ap_var_type)phdr.type) + sizeof(phdr);
}
*pofs = ~0;
serialDebug("scan past end of eeprom");
return false;
}
// Copy the variable's whole name to the supplied buffer.
//
// If the variable is a group member, prepend the group name.
//
void AP_Param::copy_name(char *buffer, size_t buffer_size)
{
uint8_t group_element;
const struct GroupInfo *ginfo;
const struct AP_Param::Info *info = find_var_info(&group_element, &ginfo);
if (info == NULL) {
*buffer = 0;
serialDebug("no info found");
return;
}
strncpy_P(buffer, info->name, buffer_size);
if (ginfo != NULL) {
uint8_t len = strnlen(buffer, buffer_size);
if (len < buffer_size) {
strncpy_P(&buffer[len], ginfo->name, buffer_size-len);
}
}
}
// Find a variable by name in a group
AP_Param *
AP_Param::find_group(const char *name, uint8_t vindex, const struct GroupInfo *group_info, enum ap_var_type *ptype)
{
uint8_t type;
for (uint8_t i=0;
(type=pgm_read_byte(&group_info[i].type)) != AP_PARAM_NONE;
i++) {
if (type == AP_PARAM_GROUP) {
const struct GroupInfo *ginfo = (const struct GroupInfo *)pgm_read_pointer(&group_info[i].group_info);
AP_Param *ap = find_group(name, vindex, ginfo, ptype);
if (ap != NULL) {
return ap;
}
} else if (strcasecmp_P(name, group_info[i].name) == 0) {
uintptr_t p = pgm_read_pointer(&_var_info[vindex].ptr);
*ptype = (enum ap_var_type)type;
return (AP_Param *)(p + pgm_read_pointer(&group_info[i].offset));
}
}
return NULL;
}
// Find a variable by name.
//
AP_Param *
AP_Param::find(const char *name, enum ap_var_type *ptype)
{
for (uint16_t i=0; i<_num_vars; i++) {
uint8_t type = pgm_read_byte(&_var_info[i].type);
if (type == AP_PARAM_GROUP) {
uint8_t len = strnlen_P(_var_info[i].name, AP_MAX_NAME_SIZE);
if (strncmp_P(name, _var_info[i].name, len) != 0) {
continue;
}
const struct GroupInfo *group_info = (const struct GroupInfo *)pgm_read_pointer(&_var_info[i].group_info);
return find_group(name + len, i, group_info, ptype);
} else if (strcasecmp_P(name, _var_info[i].name) == 0) {
*ptype = (enum ap_var_type)type;
return (AP_Param *)pgm_read_pointer(&_var_info[i].ptr);
}
}
return NULL;
}
// Save the variable to EEPROM, if supported
//
bool AP_Param::save(void)
{
uint8_t group_element;
const struct GroupInfo *ginfo;
const struct AP_Param::Info *info = find_var_info(&group_element, &ginfo);
if (info == NULL) {
// we don't have any info on how to store it
return false;
}
struct Param_header phdr;
// create the header we will use to store the variable
if (ginfo != NULL) {
phdr.type = pgm_read_byte(&ginfo->type);
phdr.key = pgm_read_word(&info->key);
phdr.group_element = group_element;
} else {
phdr.type = pgm_read_byte(&info->type);
phdr.key = pgm_read_word(&info->key);
phdr.group_element = 0;
}
// scan EEPROM to find the right location
uint16_t ofs;
if (scan(&phdr, &ofs)) {
// found an existing copy of the variable
eeprom_write_check(this, ofs+sizeof(phdr), type_size((enum ap_var_type)phdr.type));
return true;
}
if (ofs == (uint16_t)~0) {
return false;
}
// write a new sentinal, then the data, then the header
write_sentinal(ofs + sizeof(phdr) + type_size((enum ap_var_type)phdr.type));
eeprom_write_check(this, ofs+sizeof(phdr), type_size((enum ap_var_type)phdr.type));
eeprom_write_check(&phdr, ofs, sizeof(phdr));
return true;
}
// Load the variable from EEPROM, if supported
//
bool AP_Param::load(void)
{
uint8_t group_element;
const struct GroupInfo *ginfo;
const struct AP_Param::Info *info = find_var_info(&group_element, &ginfo);
if (info == NULL) {
// we don't have any info on how to load it
return false;
}
struct Param_header phdr;
// create the header we will use to match the variable
if (ginfo != NULL) {
phdr.type = pgm_read_byte(&ginfo->type);
phdr.key = pgm_read_word(&info->key);
phdr.group_element = group_element;
} else {
phdr.type = pgm_read_byte(&info->type);
phdr.key = pgm_read_word(&info->key);
phdr.group_element = 0;
}
// scan EEPROM to find the right location
uint16_t ofs;
if (!scan(&phdr, &ofs)) {
return false;
}
// found it
eeprom_read_block(this, (void*)(ofs+sizeof(phdr)), type_size((enum ap_var_type)phdr.type));
return true;
}
// Load all variables from EEPROM
//
bool AP_Param::load_all(void)
{
struct Param_header phdr;
uint16_t ofs = sizeof(AP_Param::EEPROM_header);
while (ofs < _eeprom_size) {
eeprom_read_block(&phdr, (const void *)ofs, sizeof(phdr));
if (phdr.type == AP_PARAM_NONE &&
phdr.key == 0) {
// we've reached the sentinal
return true;
}
const struct AP_Param::Info *info;
void *ptr;
info = find_by_header(phdr, &ptr);
if (info != NULL) {
eeprom_read_block(ptr, (void*)(ofs+sizeof(phdr)), type_size((enum ap_var_type)phdr.type));
}
ofs += type_size((enum ap_var_type)phdr.type) + sizeof(phdr);
}
// we didn't find the sentinal
serialDebug("no sentinal in load_all");
return false;
}
// return the first variable in _var_info
AP_Param *AP_Param::first(uint32_t *token, enum ap_var_type *ptype)
{
*token = 0;
if (_num_vars == 0) {
return NULL;
}
if (ptype != NULL) {
*ptype = (enum ap_var_type)pgm_read_byte(&_var_info[0].type);
}
return (AP_Param *)(pgm_read_pointer(&_var_info[0].ptr));
}
/// Returns the next variable in a group, recursing into groups
/// as needed
AP_Param *AP_Param::next_group(uint8_t vindex, const struct GroupInfo *group_info,
bool *found_current,
uint8_t group_base,
uint8_t group_shift,
uint32_t *token,
enum ap_var_type *ptype)
{
uint8_t type;
for (uint8_t i=0;
(type=pgm_read_byte(&group_info[i].type)) != AP_PARAM_NONE;
i++) {
if (type == AP_PARAM_GROUP) {
// a nested group
const struct GroupInfo *ginfo = (const struct GroupInfo *)pgm_read_pointer(&group_info[i].group_info);
AP_Param *ap;
ap = next_group(vindex, ginfo, found_current, GROUP_OFFSET(group_base, i, group_shift),
group_shift + _group_level_shift, token, ptype);
if (ap != NULL) {
return ap;
}
} else {
if (*found_current) {
// got a new one
(*token) = ((uint32_t)GROUP_OFFSET(group_base, i, group_shift)<<16) | vindex;
if (ptype != NULL) {
*ptype = (enum ap_var_type)type;
}
return (AP_Param*)(pgm_read_pointer(&_var_info[vindex].ptr) + pgm_read_word(&group_info[i].offset));
}
if (GROUP_OFFSET(group_base, i, group_shift) == (*token)>>16) {
*found_current = true;
}
}
}
return NULL;
}
/// Returns the next variable in _var_info, recursing into groups
/// as needed
AP_Param *AP_Param::next(uint32_t *token, enum ap_var_type *ptype)
{
uint16_t i = (*token)&0xFFFF;
bool found_current = false;
if (i >= _num_vars) {
// illegal token
return NULL;
}
uint8_t type = pgm_read_byte(&_var_info[i].type);
if (type != AP_PARAM_GROUP) {
i++;
found_current = true;
}
for (; i<_num_vars; i++) {
type = pgm_read_byte(&_var_info[i].type);
if (type == AP_PARAM_GROUP) {
const struct GroupInfo *group_info = (const struct GroupInfo *)pgm_read_pointer(&_var_info[i].group_info);
AP_Param *ap = next_group(i, group_info, &found_current, 0, 0, token, ptype);
if (ap != NULL) {
return ap;
}
} else {
// found the next one
(*token) = i;
if (ptype != NULL) {
*ptype = (enum ap_var_type)type;
}
return (AP_Param *)(pgm_read_pointer(&_var_info[i].ptr));
}
}
return NULL;
}
/// Returns the next scalar in _var_info, recursing into groups
/// as needed
AP_Param *AP_Param::next_scalar(uint32_t *token, enum ap_var_type *ptype)
{
AP_Param *ap;
enum ap_var_type type;
while ((ap = next(token, &type)) != NULL && type > AP_PARAM_FLOAT) ;
if (ap != NULL && ptype != NULL) {
*ptype = type;
}
return ap;
}
/// cast a variable to a float given its type
float AP_Param::cast_to_float(enum ap_var_type type)
{
switch (type) {
case AP_PARAM_INT8:
return ((AP_Int8 *)this)->cast_to_float();
case AP_PARAM_INT16:
return ((AP_Int16 *)this)->cast_to_float();
case AP_PARAM_INT32:
return ((AP_Int32 *)this)->cast_to_float();
case AP_PARAM_FLOAT:
return ((AP_Float *)this)->cast_to_float();
default:
return NAN;
}
}
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