mjs513
Senior Member+
While playing around with another project realized that I pretty much forgot how to use the Teensy SDFat that comes with Teensyduino to access the partitions on a SD card. Pretty always use MTP responder when I wanted to do stuff like that or just use a single partitioned drive. So spent the last couple of days remembering and putting together a sketch that would jog my memory.
Below is a sample run from the sketch:
First that appears is the menu
Note: didn't implement r, S, t yet.....
First thing you do is select 'I' to initialize the SD Card:
Next think is you have to select '1' to populate and display the partition table so you can tell the sketch what partition you want to use.
Next up is to tell it what partition you want to use, in the case of the exFat partition I would say '22', first 2 is the option, second 2 is the partition number.
'd' will dump the data and 'l' will list the directory:
'L' would list the directories all partitions including the partition name.
Cheers.
Below is a sample run from the sketch:
First that appears is the menu
Code:
Menu Options:
I - Initialize Drive
1 - List Partitions (Step 1)
2# - Select Drive # for Logging (Step 2)
l - List files on selected partition
L - List files on all partitions
s - Start Logging data (Restarting logger will append records to existing log)
x - Stop Logging data
d - Dump Log
r - Reset
'S, or t': Make 2MB file , or remove all 2MB files h - MenuFirst thing you do is select 'I' to initialize the SD Card:
Code:
Card size: 63.86 GB (GB = 1E9 bytes)
Card size: 59.48 GiB (GiB = 2^30 bytes)
Card type: SDXC
cardSize: 63864.57 MB (MB = 1,000,000 bytes)
flashEraseSize: 128 blocks
eraseSingleBlock: trueNext think is you have to select '1' to populate and display the partition table so you can tell the sketch what partition you want to use.
Code:
SD Partition Table
part, boot, bgnCHS[3], type, endCHS[3], start, length
(2)FAT32: 1,0,0x21,0x22,0x0,0xB,0xFE,0xFF,0xFF,2112,62377984
(3)exFAT: 2,0,0xFE,0xFF,0xFF,0x7,0xFE,0xFF,0xFF,62382144,62351424
pt_#0: 3,0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0,0
pt_#0: 4,0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0,0Next up is to tell it what partition you want to use, in the case of the exFat partition I would say '22', first 2 is the option, second 2 is the partition number.
Code:
Storage Index 2 Selected of 2[/CODE\
this confirms that you are using the second partition of the 2 partitions available.
If you select 's' you can start the datalogger and 'x' will stop logging data.
[CODE]Logging Data!!!
File opened!!!
13,15,11
13,7,10
13,7,10
13,7,10
8,14,10
.... etc'd' will dump the data and 'l' will list the directory:
Code:
Listing files on storage Index: 2
Space Used = 20447232
Filesystem Size = 31918686208
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2019-01-01 00:13 8393728 SDTEST1.raw
2023-01-01 00:00 245 datalog.txt'L' would list the directories all partitions including the partition name.
Cheers.
