uSD P2 FlexBASIC

Rsadeika

I am trying to open a file, in a COG, and have something written there. But, in my program, nothing is happening. Not sure what I am missing.

Ray

' test2sd.bas

OPTION EXPLICIT                              ' 
CONST HEAPSIZE = 8192                        ' lots of elbow room

mount ("/sd", _vfs_open_sdcardx(5,4,3,2))  ' mount the file system at /SD node

dim s$ as string

dim stack_dlog1(64)

dim cpuID_4 as long

cpuID_4 = cpu(dataLog(),@stack_dlog1(1))

do 
    pausems 2000

loop


end

'COGed datalog
sub datalog

    open "/sd/dlog1.txt" for input as #8
    print #8, "Datalog" 
    print "Debug, in datalog"
do
    print #8, "a";chr$(13)  
    pausesec 1  ' Pause for five minutes.
loop

end sub
'''''''''''''''

ersmith

Only one COG at a time can use any set of pins, including the SD card pins. My recommendation would be to use the main COG for any file I/O, but if you really need to do file I/O in another COG (why??) then you'd have to do the mount in that COG as well.

Rsadeika

What I was thinking about is testing the idea of, one COG would be collecting the data, and storing in a file, while another COG would be able to open the file, and do some sort of analysis of the data collected, if at all possible.

Ray

Rsadeika

I am experimenting with the program below, and in a COG, the values that are being written are not what I am expecting.

Does this mean that when you mount in different COG, the uSD function works differently?

Ray

' test2sd.bas

OPTION EXPLICIT                              '
CONST HEAPSIZE = 8192                        ' lots of elbow room

'mount ("/sd", _vfs_open_sdcardx(5,4,3,2))  ' mount the file system at /SD node

dim s$ as string

dim stack_dlog1(64)

dim cpuID_4 as long



'   open "/sd/dlog1.txt" for output as #8   
'   print #8, "Datalog" 
'   close #8
cpuID_4 = cpu(dataLog(),@stack_dlog1(1))    
    'print "Debug, in datalog"
    dim a as integer
do 
    pausems 2000
'   open "/sd/dlog1.txt" for append as #8
'   print #8, a;
'   print #8 chr$(13)
'   a = a + 1
'   close #8
'   pausesec 1  ' Pause

loop


end

'COGed datalog
sub datalog
mount ("/sd", _vfs_open_sdcardx(5,4,3,2)) 
    open "/sd/dlog1.txt" for output as #8   
    print #8, "Datalog" 
    close #8
    dim a as integer
do 
    'pausems 2000
    open "/sd/dlog1.txt" for append as #8
    print #8, a;
    print #8 chr$(13)
    a = a + 1
    close #8
    pausesec 1  ' Pause

loop

end sub
'''''''''''''''

( Entering terminal mode.  Press Ctrl-] or Ctrl-Z to exit. )
mounted SD card as /sd
mounted host file system as /host
cmd> type /sd/dlog1.txt
Datalog
-167363576
-167363575
cmd> 

pik33

Don't mix this kind of operations between cogs. It can be a source of hard to find bugs.

Another question: can a channel number be 8? The FlexBasic help says this has to be 0 to 7, where 0 and 1 is reserved. Maybe this #8 is the source of the bug.

Edit: I found in the source code that max file# is 9, not 7

pik33

if you really need to do file I/O in another COG (why??)

Now I know why. My main cog is doing SD "file manager" while another one wants to play .wav This is of course not possible with this architecture - now I need to write a "file access" cog driver with its own mailbox type API

Is there something like "unmount"?