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ardupilot/libraries/DataFlash/DataFlash_File.cpp

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/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/*
DataFlash logging - file oriented variant
This uses posix file IO to create log files called logs/NN.bin in the
given directory
*/
#include <AP_HAL.h>
#if CONFIG_HAL_BOARD == HAL_BOARD_PX4 || CONFIG_HAL_BOARD == HAL_BOARD_AVR_SITL || CONFIG_HAL_BOARD == HAL_BOARD_LINUX
#include "DataFlash.h"
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <AP_Math.h>
#include <stdio.h>
extern const AP_HAL::HAL& hal;
#define MAX_LOG_FILES 500U
#define DATAFLASH_PAGE_SIZE 1024UL
int DataFlash_File::_write_fd = -1;
volatile bool DataFlash_File::_initialised = false;
uint8_t *DataFlash_File::_writebuf = NULL;
const uint16_t DataFlash_File::_writebuf_size = 4096;
volatile uint16_t DataFlash_File::_writebuf_head = 0;
volatile uint16_t DataFlash_File::_writebuf_tail = 0;
uint32_t DataFlash_File::_last_write_time = 0;
/*
constructor
*/
DataFlash_File::DataFlash_File(const char *log_directory) :
_read_fd(-1),
_log_directory(log_directory)
{}
// initialisation
void DataFlash_File::Init(void)
{
// create the log directory if need be
int ret;
ret = mkdir(_log_directory, 0777);
if (ret == -1 && errno != EEXIST) {
hal.console->printf("Failed to create log directory %s", _log_directory);
return;
}
if (_writebuf != NULL) {
free(_writebuf);
}
_writebuf = (uint8_t *)malloc(_writebuf_size);
if (_writebuf == NULL) {
return;
}
_writebuf_head = _writebuf_tail = 0;
_initialised = true;
hal.scheduler->register_io_process(_io_timer);
}
// return true for CardInserted() if we successfully initialised
bool DataFlash_File::CardInserted(void)
{
return _initialised;
}
// erase handling
bool DataFlash_File::NeedErase(void)
{
// we could add a format marker at the start of a file?
return false;
}
/*
construct a log file name given a log number.
Note: Caller must free.
*/
char *DataFlash_File::_log_file_name(uint16_t log_num)
{
char *buf = NULL;
asprintf(&buf, "%s/%u.bin", _log_directory, (unsigned)log_num);
return buf;
}
/*
return path name of the lastlog.txt marker file
Note: Caller must free.
*/
char *DataFlash_File::_lastlog_file_name(void)
{
char *buf = NULL;
asprintf(&buf, "%s/lastlog.txt", _log_directory);
return buf;
}
// remove all log files
void DataFlash_File::EraseAll()
{
uint16_t log_num;
for (log_num=0; log_num<MAX_LOG_FILES; log_num++) {
char *fname = _log_file_name(log_num);
if (fname == NULL) {
break;
}
unlink(fname);
free(fname);
}
char *fname = _lastlog_file_name();
if (fname != NULL) {
unlink(fname);
free(fname);
}
}
/*
buffer handling macros
*/
#define BUF_AVAILABLE(buf) ((buf##_head > (_tail=buf##_tail))? (buf##_size - buf##_head) + _tail: _tail - buf##_head)
#define BUF_SPACE(buf) (((_head=buf##_head) > buf##_tail)?(_head - buf##_tail) - 1:((buf##_size - buf##_tail) + _head) - 1)
#define BUF_EMPTY(buf) (buf##_head == buf##_tail)
#define BUF_ADVANCETAIL(buf, n) buf##_tail = (buf##_tail + n) % buf##_size
#define BUF_ADVANCEHEAD(buf, n) buf##_head = (buf##_head + n) % buf##_size
/* Write a block of data at current offset */
void DataFlash_File::WriteBlock(const void *pBuffer, uint16_t size)
{
if (_write_fd == -1 || !_initialised) {
return;
}
uint16_t _head;
uint16_t space = BUF_SPACE(_writebuf);
if (space < size) {
// discard the whole write, to keep the log consistent
return;
}
if (_writebuf_tail < _head) {
// perform as single memcpy
assert(_writebuf_tail+size <= _writebuf_size);
memcpy(&_writebuf[_writebuf_tail], pBuffer, size);
BUF_ADVANCETAIL(_writebuf, size);
} else {
// perform as two memcpy calls
uint16_t n = _writebuf_size - _writebuf_tail;
if (n > size) n = size;
assert(_writebuf_tail+n <= _writebuf_size);
memcpy(&_writebuf[_writebuf_tail], pBuffer, n);
BUF_ADVANCETAIL(_writebuf, n);
pBuffer = (const void *)(((const uint8_t *)pBuffer) + n);
n = size - n;
if (n > 0) {
assert(_writebuf_tail+n <= _writebuf_size);
memcpy(&_writebuf[_writebuf_tail], pBuffer, n);
BUF_ADVANCETAIL(_writebuf, n);
}
}
}
/*
read a packet. The header bytes have already been read.
*/
void DataFlash_File::ReadBlock(void *pkt, uint16_t size)
{
if (_read_fd == -1 || !_initialised) {
return;
}
memset(pkt, 0, size);
::read(_read_fd, pkt, size);
_read_offset += size;
}
/*
find the highest log number
*/
uint16_t DataFlash_File::find_last_log(void)
{
unsigned ret = 0;
char *fname = _lastlog_file_name();
if (fname == NULL) {
return ret;
}
FILE *f = ::fopen(fname, "r");
free(fname);
if (f != NULL) {
char buf[10];
memset(buf, 0, sizeof(buf));
// PX4 doesn't have fscanf()
if (fread(buf, 1, sizeof(buf)-1, f) > 0) {
sscanf(buf, "%u", &ret);
}
fclose(f);
}
return ret;
}
uint32_t DataFlash_File::_get_log_size(uint16_t log_num)
{
char *fname = _log_file_name(log_num);
if (fname == NULL) {
return 0;
}
struct stat st;
if (::stat(fname, &st) != 0) {
free(fname);
return 0;
}
free(fname);
return st.st_size;
}
/*
find the number of pages in a log
*/
void DataFlash_File::get_log_boundaries(uint16_t log_num, uint16_t & start_page, uint16_t & end_page)
{
start_page = 0;
end_page = _get_log_size(log_num) / DATAFLASH_PAGE_SIZE;
}
/*
get the number of logs - note that the log numbers must be consecutive
*/
uint16_t DataFlash_File::get_num_logs(void)
{
uint16_t ret;
uint16_t high = find_last_log();
for (ret=1; ret<high; ret++) {
if (_get_log_size(high - ret) <= 0) {
break;
}
}
return ret;
}
/*
start writing to a new log file
*/
uint16_t DataFlash_File::start_new_log(void)
{
if (_write_fd != -1) {
int fd = _write_fd;
_write_fd = -1;
::close(fd);
}
uint16_t log_num = find_last_log();
// re-use empty logs if possible
if (_get_log_size(log_num) > 0 || log_num == 0) {
log_num++;
}
if (log_num > MAX_LOG_FILES) {
log_num = 1;
}
char *fname = _log_file_name(log_num);
_write_fd = ::open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
free(fname);
if (_write_fd == -1) {
_initialised = false;
return 0xFFFF;
}
// now update lastlog.txt with the new log number
fname = _lastlog_file_name();
FILE *f = ::fopen(fname, "w");
fprintf(f, "%u\n", (unsigned)log_num);
fclose(f);
free(fname);
return log_num;
}
/*
Read the log and print it on port
*/
void DataFlash_File::LogReadProcess(uint16_t log_num,
uint16_t start_page, uint16_t end_page,
uint8_t num_types,
const struct LogStructure *structure,
void (*print_mode)(AP_HAL::BetterStream *port, uint8_t mode),
AP_HAL::BetterStream *port)
{
uint8_t log_step = 0;
if (!_initialised) {
return;
}
if (_read_fd != -1) {
::close(_read_fd);
}
char *fname = _log_file_name(log_num);
if (fname == NULL) {
return;
}
_read_fd = ::open(fname, O_RDONLY);
free(fname);
if (_read_fd == -1) {
return;
}
_read_offset = 0;
if (start_page != 0) {
::lseek(_read_fd, start_page * DATAFLASH_PAGE_SIZE, SEEK_SET);
}
while (true) {
uint8_t data;
if (::read(_read_fd, &data, 1) != 1) {
// reached end of file
break;
}
_read_offset++;
// This is a state machine to read the packets
switch(log_step) {
case 0:
if (data == HEAD_BYTE1) {
log_step++;
}
break;
case 1:
if (data == HEAD_BYTE2) {
log_step++;
} else {
log_step = 0;
}
break;
case 2:
log_step = 0;
_print_log_entry(data, num_types, structure, print_mode, port);
break;
}
if (_read_offset >= (end_page+1) * DATAFLASH_PAGE_SIZE) {
break;
}
}
::close(_read_fd);
_read_fd = -1;
}
/*
this is a lot less verbose than the block interface. Dumping 2Gbyte
of logs a page at a time isn't so useful. Just pull the SD card out
and look at it on your PC
*/
void DataFlash_File::DumpPageInfo(AP_HAL::BetterStream *port)
{
port->printf_P(PSTR("DataFlash: num_logs=%u\n"),
(unsigned)get_num_logs());
}
void DataFlash_File::ShowDeviceInfo(AP_HAL::BetterStream *port)
{
port->printf_P(PSTR("DataFlash logs stored in %s\n"),
_log_directory);
}
/*
list available log numbers
*/
void DataFlash_File::ListAvailableLogs(AP_HAL::BetterStream *port)
{
uint16_t num_logs = get_num_logs();
int16_t last_log_num = find_last_log();
if (num_logs == 0) {
port->printf_P(PSTR("\nNo logs\n\n"));
return;
}
port->printf_P(PSTR("\n%u logs\n"), (unsigned)num_logs);
for (uint16_t i=num_logs; i>=1; i--) {
uint16_t log_num = last_log_num - i + 1;
off_t size;
char *filename = _log_file_name(log_num);
if (filename != NULL) {
size = _get_log_size(log_num);
if (size != 0) {
port->printf_P(PSTR("Log %u in %s of size %u\n"),
(unsigned)log_num,
filename,
(unsigned)size);
}
free(filename);
}
}
port->println();
}
void DataFlash_File::_io_timer(uint32_t tnow)
{
uint16_t _tail;
if (_write_fd == -1 || !_initialised) {
return;
}
uint16_t nbytes = BUF_AVAILABLE(_writebuf);
if (nbytes == 0) {
return;
}
if (nbytes < 512 &&
tnow - _last_write_time < 2000000UL) {
// write in 512 byte chunks, but always write at least once
// per 2 seconds if data is available
return;
}
_last_write_time = tnow;
if (nbytes > 512) {
// be kind to the FAT PX4 filesystem
nbytes = 512;
}
if (_writebuf_head > _tail) {
// only write to the end of the buffer
nbytes = min(nbytes, _writebuf_size - _writebuf_head);
}
assert(_writebuf_head+nbytes <= _writebuf_size);
ssize_t nwritten = ::write(_write_fd, &_writebuf[_writebuf_head], nbytes);
if (nwritten <= 0) {
hal.console->printf("DataFlash write: %d %d\n", (int)nwritten, (int)errno);
close(_write_fd);
_write_fd = -1;
_initialised = false;
} else {
::fsync(_write_fd);
BUF_ADVANCEHEAD(_writebuf, nwritten);
}
}
#endif // CONFIG_HAL_BOARD
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