Logs to file system questions

[eetnev]

Hi,

New Zephyr user here!

I managed to get CONFIG_LOG_BACKEND_FS working with CONFIG_FAT_FILESYSTEM_ELM on a SD-card but I have a few issues/questions:

1. I was debugging a secure fault issue before understanding that I unmounted the file system before log process thread had synched the remaining buffered log traces into the file system. How can I fs_unmount() the file system safely?

2. For some reason the generated log files are not in text file format. I believe the file extension dropped from some reason after tweaking prj.conf. Is there something obvious that I'm missing?

3. What could "<0x1b>[0m" be? Every line is wrapped by this sequence.

for (i = 0; i < 10000; i++)
{
    LOG_INF("hello %d", i);
}


[00:00:03.199,676] �[0m<inf> app: Block count 30228480�[0m
[00:00:03.242,736] �[0m<inf> app: hello 0�[0m
[00:00:03.242,767] �[0m<inf> app: hello 1�[0m
[00:00:03.242,767] �[0m<inf> app: hello 2�[0m
[00:00:03.242,767] �[0m<inf> app: hello 3�[0m
[00:00:03.242,797] �[0m<inf> app: hello 4�[0m
[00:00:03.242,797] �[0m<inf> app: hello 5�[0m
[00:00:03.242,797] �[0m<inf> app: hello 6�[0m
[00:00:03.242,828] �[0m<inf> app: hello 7�[0m
[00:00:03.242,828] �[0m<inf> app: hello 8�[0m
[00:00:03.242,828] �[0m<inf> app: hello 9�[0m
[00:00:03.242,858] �[0m<inf> app: hello 10�[0m
[00:00:03.242,889] �[0m<inf> app: hello 11�[0m
[00:00:03.242,889] �[0m<inf> app: hello 12�[0m
[00:00:03.242,889] �[0m<inf> app: hello 13�[0m
[00:00:03.242,889] �[0m<inf> app: hello 14�[0m
[00:00:03.242,919] �[0m<inf> app: hello 15�[0m
[00:00:03.242,919] �[0m<inf> app: hello 16�[0m
[00:00:03.242,919] �[0m<inf> app: hello 17�[0m
[00:00:03.242,950] �[0m<inf> app: hello 18�[0m
[00:00:03.242,950] �[0m<inf> app: hello 19�[0m
.
.
.

# Stacks and heaps
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_HEAP_MEM_POOL_SIZE=16384

CONFIG_DEBUG=y
CONFIG_DEBUG_THREAD_INFO=y
CONFIG_DEBUG_OPTIMIZATIONS=y
CONFIG_EXCEPTION_STACK_TRACE=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_COREDUMP=y

CONFIG_GPIO=y
CONFIG_I2C=y
CONFIG_SPI=y

CONFIG_STDOUT_CONSOLE=y
CONFIG_LOG=y
CONFIG_LOG_BUFFER_SIZE=2048
CONFIG_LOG_MODE_DEFERRED=y
CONFIG_LOG_MAX_LEVEL=4
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_ASSERT=y

# Sensors
CONFIG_SENSOR=y
CONFIG_MC3419=y
CONFIG_MC3419_TRIGGER_GLOBAL_THREAD=y
CONFIG_MC3419_TRIGGER_ANYMOTION=y
CONFIG_MC3419_TRIGGER_FIFO=y
CONFIG_MAX5418=y
CONFIG_ADP536X=y

# SPI flash
CONFIG_FLASH=y
CONFIG_SPI_NOR=y

# EEPROM
CONFIG_EEPROM=y
CONFIG_EEPROM_AT24=y
CONFIG_EEPROM_INIT_PRIORITY=75

# Shell
#CONFIG_SHELL=y
#CONFIG_SHELL_HELP=y
#CONFIG_SHELL_MINIMAL=y
#CONFIG_SHELL_STACK_SIZE=1024
#CONFIG_SHELL_BACKEND_SERIAL=y

# SDMMC
CONFIG_FILE_SYSTEM=y
CONFIG_FS_FATFS_LFN=y
CONFIG_FAT_FILESYSTEM_ELM=y
CONFIG_DISK_ACCESS=y
CONFIG_DISK_DRIVER_SDMMC=y

# File system backend
CONFIG_LOG_BACKEND_FS=y
CONFIG_LOG_BACKEND_FS_OVERWRITE=y
CONFIG_LOG_BACKEND_FS_FILE_PREFIX="log"
CONFIG_LOG_BACKEND_FS_DIR="/SD:"
CONFIG_LOG_BACKEND_FS_FILE_SIZE=104857600
CONFIG_LOG_BACKEND_FS_FILES_LIMIT=10
CONFIG_LOG_BACKEND_FS_OUTPUT_TEXT=y
CONFIG_SDMMC_LOG_LEVEL_OFF=y

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=4096
CONFIG_LOG_BLOCK_IN_THREAD=y
CONFIG_LOG_SPEED=y

[yashi]

What could "<0x1b>[0m" be? Every line is wrapped by this sequence.

That must be terminal color code. CONFIG_LOG_BACKEND_SHOW_COLOR perhaps?

[eetnev]

That makes sense. I thought it was some garbage leaking in.

[yashi]

For some reason the generated log files are not in text file format. I believe the file extension dropped from some reason after tweaking prj.conf. Is there something obvious that I'm missing?

I don't get what you are trying to explain. what do you mean

1. by "not in text file format."? does it related with the color code you mentioned?
2. by "file extension dropped"? Who's creating file and file name?

[eetnev]

by "file extension dropped"? Who's creating file and file name?

I remember seeing a log file with a file extension (.log, .txt, etc.) on the SD-card but that must be a false memory because log_backend_fs.c doesn't give a file extension to the log file.

snprintf(fname, sizeof(fname), "%s/%s%04d",
	CONFIG_LOG_BACKEND_FS_DIR,
	CONFIG_LOG_BACKEND_FS_FILE_PREFIX, curr_file_num);

rc = fs_open(file, fname, FS_O_CREATE | FS_O_WRITE);
if (rc < 0) {
	goto out;
}