SDcard and Propeller

rkrasowski

Hello,
I am trying to create log, that will be logging temperature, pressure, GPS data etc. Plan is to send data to main computer using XBee as well as record it into SD card connected with Propeller.
Sadly I have a problem at the beginig of working with SDcard. I am using following code:

"
OBJ
sdfat : "fsrw"
db : "FullDuplexSerial"
PUB main | gmt, r
db.start(31,30,0,9600)
db.str(string(13,"Will try to mount SDCard",13))

if \sdfat.mount(3) <> 0
db.str(string(13,"Failed to mount SD"))
sdmounted := 0
else
sdmounted := 1
db.str(string("Mounted.", 13))
"
and I can not mount the card, I am getting message "Failed to mount SD".
I am using Propeller Demo board with micro-SD Card Adapter. My SD card has 2Gb and is formatted in FAT16. My base code is from book "programming and customizing the multicore propeller microcontroller". Source code : ftp://ftp.propeller-chip.com/PCMProp/Chapter_09/Source/
My SDcard connect:
P0 - DO
P1 - CLK
P2 - DI
P3 - CS

What is the problem??
Thanks in advance
Robert

Mike Green

The problem is your sdfat.mount call. The value passed there is the 1st pin of a group of 4, not the last pin. For your connections (P0-P3 = DO/CLK/DI/CS), you should use sdfat.mount(0)

rkrasowski

Hi Mike,
thanks like always
Well even before I tried " if \sdfat.mount(0) <> 0"
No luck, still can not mount
Any ideas??
Robert

Mike Green

The change I mentioned should work. Check your wiring. Reformat your SD card. The current FSRW 2.6 should work whether the card is FAT16 or FAT32. Make sure the 3.3V and Ground connections are correct.

In the future, please use the [ CODE ] and [ /CODE ] brackets around your code. Cutting and pasting causes your code formatting to be lost. With Spin, it's impossible to tell how your program works unless you use the brackets.

rkrasowski

Ok, it works,
I upgraded to new ver of FSRW (2.6) and now it works !!!
Thanks Mike again
Robert

Cluso99

rkrasowski: Robert, welcome to the prop and this fantastic forum. As you can see, help is usually pretty quick here and the prop is a great chip.

rkrasowski

Yep, it took 15 min for Mike to respond , great ......
I am making progress with my project, now I am stuck on adding data into the file on SDcard. Now everytime propeller is power on , starts routine and start writting ( and erasing data) into the same file, I am sure there is a method for writting, reading and adding.
Is it insteed of:

sdfat.popen(string("newfilexr.txt"), "r") - writting


sdfat.popen(string("newfilexr.txt"), "a") - adding

just guessing, I have not tested this yet.

Robert

Mike Green

Consider switching to Kye's SD card library (here). It supports appending to an existing file. It also handles subdirectories which FSRW does not.

Oldbitcollector (Jeff)

Agree'd! I just switched with one of my projects tonight. Subdirectories are a godsend!

Kye's SD routines aren't too much different in the way they handle. If you can do fsrw, you can handle the switch.

OBC

rkrasowski

So far I am working with FSRW
I am analizing all methods and I do not see method to put decimal value into the SDcard. Old ver had something like SDStr, SDdec, SDhex. Ver 2.6 does not have it. I see pputs ( i uderstand this is for string)
I see pputc, but how do I write dec value??
Thanks like always
Robert

Duane Degn

I don't remember is FSRW has a dec method. If not, take a look at FullDuplexSerial and use a similar method of converting a decimal number to ASCII characters.

rkrasowski

Thanks for idea and help. I simply copied method SDdec form old version of FSRW that allows put decimal values into SDcard and it works
Here is the code if anyone needs it:
[
PUB SDdec(value) | i

if value < 0
-value
pputc("-")
i := 1_000_000_000
repeat 10
if value => i
pputc(value / i + "0")
value //= i
result~~
elseif result or i == 1
pputc("0")
i /= 10
]

also answering my previous question, FSRW can add data to file. Here is the code to open file for adding :

[
sdfat.popen(string("newfilexr.txt"), "a")
]

Thanks again for yopur help.
Robert