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Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 5089

Posted: 12:42pm 02 Aug 2020

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Dear matherp,

While creating the tetris game I ran into some things I could need some guidance with.
It relates to the SD card file handling.

I want to create a file on SD card, and write data in it, and read it back again.

There are 2 problems I ran into:

1/ According to the manual I should be able to write multiple variables in one print statement. I cannot get it to work.

I tried all options (variables separated by space, comma, semicolumn, combinations), see below program, but none seem to work except individual writes (print #). By the way, this problem also exists for individual reads (input #).

2/ When audio is playing, it opens a file handle to the SD card. Not documented, I think this is file handle #1, since when I play audio, I cannot use #1 anymore.

Test code:

Print "test for SD card file access on Armmite F4"
a=100:b=200:d=300:e=400:c=-12
Print MM.Device$;" version";MM.Ver;" (version 5.05.10)"
Print
Print "original variables : "
Print a,b,c,d,e
Print
Print "individual write and individual read from file"
write5individual
read5individual
Print
Print "write 5 using print #1,a,b,c,d,e "
write5comma
read5individual
Print
Print "write 5 using print #1,a,;b,;c,;d,;e "
write5commacol
read5individual
Print
Print "write 5 using print #1,a;b;c;d;e "
write5col
read5individual
Print
Print "write 5 using print #1,a b c d e "
write5space
read5individual
Print
Print "individual write and individual read from file while playing sound"
Print
Play wav "tet16cut.wav"
write5individual
read5individual

End

Sub read5individual
Open "AA" For input As #1
Input #1,a
Input #1,b
Input #1,c
Input #1,d
Input #1,e
Print a,b,c,d,e
Close #1
End Sub

Sub write5comma
Open "AA" For output As #1
Print #1,a,b,c,d,e
Close #1
End Sub

Sub write5commacol
Open "AA" For output As #1
Print #1,a,;b,;c,;d,;e
Close #1
End Sub

Sub write5col
Open "AA" For output As #1
Print #1,a,b,c,d,e
Close #1
End Sub

Sub write5space
Open "AA" For output As #1
Print #1,a b c d e
Close #1
End Sub

Sub write5individual
Open "AA" For output As #1
Print #1,a
Print #1,b
Print #1,c
Print #1,d
Print #1,e
Close #1
End Sub

Terminal Output:

test for SD card file access on Armmite F4
ARMmite F407 version 5.051 (version 5.05.10)

original variables :
100 � � 200 � �-12 � � �300 � � 400

individual write and individual read from file
100 � � 200 � �-12 � � �300 � � 400

write 5 using print #1,a,b,c,d,e
100 � � 0 � � � 0 � � � 0 � � � 0

write 5 using print #1,a,;b,;c,;d,;e
100 � � 0 � � � 0 � � � 0 � � � 0

write 5 using print #1,a;b;c;d;e
100 � � 0 � � � 0 � � � 0 � � � 0

write 5 using print #1,a b c d e
100 0 0 0 0

individual write and individual read from file while playing sound

[71] Open "AA" For output As #1
Error: File number already open
>

Am I doing something wrong ? Or should these be documented ?
This is Armmite F4.
Edited 2020-08-02 22:51 by Volhout

PicomiteVGA PETSCII ROBOTS

lizby
Guru

Joined: 17/05/2016
Location: United States
Posts: 3378

Posted: 02:56pm 02 Aug 2020

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I got bitten by a version of this 2 days ago. INPUT wants its variables to be comma-separated.

My problem was that I had commas in the text data I was trying to read. It's not in the manual, but the solution is to enclose text which includes commas in quotes: "Now, it works"

This gives what you're looking for with comma-separated numbers:
Sub write5commaSep
Open "AA" For output As #1
Print #1,a;",";b;",";c;",";,d;",";e
Close #1
End Sub

Then you can read back with: Input #1,a,b,c,d,e

(I don't know what playing sound might do to it)

~
Edited 2020-08-03 01:01 by lizby

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CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2170

Posted: 03:28pm 02 Aug 2020

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lizby said ...INPUT wants its variables to be comma-separated....
This gives what you're looking for with comma-separated numbers:
Sub write5commaSep
Open "AA" For output As #1
Print #1,a;",";b;",";c;",";,d;",";e
Close #1
End Sub

Microsoft BASICs and others had a "Write" command for exactly this. it would write out comma separated values with a CRLF on the end which did precisely what you want (probably for the exact same reason)

e.g.

Write#2,10,20,30,a,b,c,d,e

would result in the line (e.g. with a-e = 1-5)

10,20,30,1,2,3,4,5

can't remember if strings written out were surrounded in quotes... think they were
http://www.cpcwiki.eu/index.php/Locomotive_BASIC#WRITE_.5B.23st.2C.5D_v.5B.24.5D.2C_v.5B.24.5D
https://www.qb64.org/wiki/WRITE_(file_statement)
https://docs.microsoft.com/en-us/office/vba/language/reference/user-interface-help/writestatement

It would not be easy to write a general SUB to WRITE that handled anything you threw at it due to the arbitrary number of things and types you might want to WRITE out.

Best approach is exactly as lizby shows above - a SUB that deals with the problem onto a target.
Edited 2020-08-03 01:33 by CaptainBoing

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