RE: [jallib] Re: problem with filling a sector buffer

ZetWeeh Mon, 13 Mar 2023 14:26:54 -0700

Hi Matt and Rob

It works!

Inverting the serial port gave rubbish and 1 stopbit I use standard.

But Matt wrote a mail: ‘I asked Rob …..’ and then a short second mail: try a pull-up resistor of 1K on CS and that was the solution for me.

And not so funny: sometimes I got about ten of ‘AAAAA’ and then rubbish.

I thought the ‘A’ is of earlier attemps and I even formatted the SD card!

In the capture of Rob I saw the whole Marilyn and it started with ‘AAAA’.

I thougt the writing did not succeed but now I know the reading crashed.

Rob: in the original code the writing and reading per byte of Marilyn was succesfull.

So there could not be a hardware problem.

I already changed the writing in writing the hex-code.

Thank you both for your help.

Regards,

Peter

Van: [email protected]
Verzonden: zaterdag 11 maart 2023 15:36
Aan: jallib
Onderwerp: Re: [jallib] Re: problem with filling a sector buffer

Hi Peter, Matt,

I had a PIC 18F4550 which is from the same family as the 18F4455 and ran the program. I only had to change the serial port to invert the output and use 1 stopbit instead of 2 but that cannot be the issue. I did not make any other changes.

It seems to work OK so there must be something wrong with either the PIC, the hardware or the SD card. I ran the PIC at 5 Volt using a level shifter to connect to the SD car which was at 3.3 Volt.

I used the Marilyn data that was given in this post. Attached the program and the terminal output.

Kind regards,

Rob

Op maandag 27 februari 2023 om 23:16:48 UTC+1 schreef [email protected]:

Hi Matthew

I sent you the code of the 18F4455 so you could bettter see what is goning wrong.
In the meantime I rewrote the code for the 16F18877. Also here byte for byte was working but the sample with a sector buffer refused to do what it had to do.

Regards,
Peter

Van: Matthew Schinkel
Verzonden: woensdag 22 februari 2023 03:14
Aan: jallib
Onderwerp: Re: [jallib] Re: problem with filling a sector buffer

Hi, this works from example 3, assuming the array is a constant (you didn't show the array in your example).

const byte MARILYN[504] = {0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,
0x42,0x42,0x42,0x42}

-- fill the sector buffer with data
for 504 using step1 loop
sd_sector_buffer[step1] = MARILYN[step1]
end loop
-- write the sector buffer to sector 20
sd_write_sector_address(20)

-- read back the same sectors
-- read sector 20 into the sector buffer
sd_read_sector_address(20)
-- now send it to the serial port
for 504 using step1 loop -- loop till the end of the sector buffer
serial_write (sd_sector_buffer[step1]) -- send each byte via serial port
end loop
On Monday, February 20, 2023 at 11:05:35 PM UTC-5 Matthew Schinkel wrote:
Hi, ok so the original sample is working? I'll try what you have but one thing I see is that your loop is 512 but marilyn is only 504. The loop should only be the size of the array.

for 504 using teller loop

sd_sector_buffer[teller] = marilyn[teller]
end loop
Matt.
On Monday, February 20, 2023 at 6:37:02 PM UTC-5 [email protected] wrote:
Hi Matt
I know that and I tried it before I wanted to write an array to the SD card.
It works perfect.
The problem is how to write an array to the SD card.

Regards,
Peter

Op 21 feb. 2023 om 00:21 heeft Matthew Schinkel <[email protected]> het volgende geschreven:
Hi, have you tried another sd card? What PIC are you using?

Please try example 3 in the sample

; --------------------------------------------------------------------------------
; -- EXAMPLE #3 write to 2 sectors using a sector buffer at a address
; -- user friendly and fastest.
; --------------------------------------------------------------------------------
; -- fill the sector buffer with data
; for 512 using step1 loop -- loop till the end of the sector buffer
; sd_sector_buffer[step1] = "B" -- set each byte of data
; end loop
; -- write the sector buffer to sector 20
; sd_write_sector_address(20)
; for 512 using step1 loop -- loop till the end of the sector buffer
; sd_sector_buffer[step1] = "C" -- set each byte of data
; end loop
; -- write the sector buffer to sector 21
; sd_write_sector_address(21)
; --
; -- read back the same sectors
; -- read sector 20 into the sector buffer
; sd_read_sector_address(20)
; -- now send it to the serial port
; for 512 using step1 loop -- loop till the end of the sector buffer
; serial_write (sd_sector_buffer[step1]) -- send each byte via serial port
; end loop
; -- read sector 21 into the sector buffer
; sd_read_sector_address(21)
; -- now send it to the serial port
; for 512 using step1 loop -- loop till the end of the sector buffer
; serial_write (sd_sector_buffer[step1]) -- send each byte via serial port
; end loop

Matt.
On Monday, February 20, 2023 at 12:12:04 PM UTC-5 [email protected] wrote:
Hi Matt
I think this is a question for you. You made a beautiful sample for writing to a sd card.
Every start of the program I use the part of your lib to control the connection to the sd card.
I can write and read the sd card byte for byte. I use a bitmap image of Marilyn Monroe of 504 bytes.

The half of the next program works perfect:
var byte gegeven
var byte data
var word step1
var word teller

sd_start_write(50)
for count(marilyn) using teller loop
sd_data_byte = marilyn[teller]
end loop
sd_stop_write
This works perfect.

I also tried to write to the sd card with a 'sector buffer' because most arrays are larger.
But first the array of Marilyn. It can be written in one sector.
Attempt 1:
print_string(serial_data, "Writing to sector 100")
print_crlf(serial_data)

sd_start_write(100)
--fill the sector buffer
for 512 using teller loop
sd_sector_buffer[teller] = marilyn[teller]
end loop
-- write the sector buffer to sector 100
sd_write_sector_address(100)
sd_stop _write

I also tried:
Attempt 2:

sd_start_write(150)
for 512 using step1 loop
gegeven = marilyn[step1]
sd_sector_buffer[step1] = gegeven
end loop
-- write the sector buffer to the sd card
sd_write_sector()
sd_stop _write

Both attempts does not work.
I get rubbish when I read the sectors.
Can you tell me how I get it working.

Regards,
Peter
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RE: [jallib] Re: problem with filling a sector buffer

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