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Forum Index : Microcontroller and PC projects : Picomite Serial Comm
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Bill.b Senior Member  Joined: 25/06/2011 Location: AustraliaPosts: 225 |
I am trying to send data to a DPplayer MP3 module. The module is working OK when activated by a push button but does not respond to the serial comms input I have used this module with picaxe in the past with great success This is the picaxe coms used to send data the DPplayer. SerOut TX, BAUD, ( $7E, $FF, $06, cmd, $00, arg.msb, arg.lsb, $EF ) Thepico program is Option colourcode on Option autorun on Option DEFAULT NONE dim integer CMD1,arg2 cmd1 = &h09 'Set SD card arg2 = 0002 send cmd1 = &h06 'Set volume arg2 = 40 send Do cmd1 = &h12 'Play 0001.mp3 arg2 = 1 send pause 1000 cmd1 = &h12 ' 'Play 0002.mp3 arg2 = 2 send pause 1000 cmd1 = &h12 'Play 0003.mp3 send pause 1000 loop sub send SetPin GP21, Gp20, com2 Open "com2:9600" As #2 print #2,&h7E,&hFF,&h06,cmd1,&h00,00,arg2,&hEF pause 100 arg2 = 0 close #2 end sub Need help with the comms. Bill Edited 2024-03-14 13:12 by Bill.b In the interests of the environment, this post has been constructed entirely from recycled electrons. |
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| PhenixRising Senior Member Joined: 07/11/2023 Location: United KingdomPosts: 284 |
Suggest you start with bin2str (manual) I use it a lot, along with str2bin  |
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Geoffg Guru  Joined: 06/06/2011 Location: AustraliaPosts: 3165 |
At first glance there are a few things that don't look right. For a start, the commas in the PRINT statement will insert tab characters or spaces in the output which I doubt that you want. Secondly, a constant like &h7E will be converted to a decimal number by the PRINT command which is not what you want. Thirdly, you should add a semicolon at the end of the PRINT command to tell MMBasic to not append a CR/LF pair. My guess is that you need something like this: print #2, Chr$(&h7E) + Chr$(&hFF) + Chr$(&h06) + Chr$(cmd1) + Chr$(0) + Chr$(arg2) + Chr$(&hEF); Also, why keep opening and closing the serial port? It probably is not causing any trouble but normally you would leave it open while the program was running. Geoff Edited 2024-03-14 13:49 by Geoffg Geoff Graham - http://geoffg.net |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 1783 |
Is there a particular need to Open and Close COM2 in the Sub? I usually set the pins and Open at the start of the program and Close at the end. If it must be done in the Sub perhaps put a 30mS pause between Open and Print to ensure it is ready to take the data. |
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Turbo46 Guru Joined: 24/12/2017 Location: AustraliaPosts: 1593 |
You need to convert the data to 8 bit ascii characters using the CHR$() function. Try: sub send SetPin GP21, Gp20, com2 Open "com2:9600" As #2 ' print #2,&h7E,&hFF,&h06,cmd1,&h00,00,arg2,&hEF print #2,chr$(&h7E),chr$(&hFF),chr$(&h06),chr$(cmd1),chr$(&h00),chr$(00),chr$(arg2),chr$(&hEF) pause 100 arg2 = 0 close #2 end sub Bill Edited 2024-03-14 13:51 by Turbo46 Keep safe. Live long and prosper. |
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| Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3165 |
No Bill, the commas (,) in the PRINT command will insert tabs or spaces. Not what is intended. My replacement PRINT command (above) was missing one character on the output. I believe that this is what is required: print #2, Chr$(&h7E) + Chr$(&hFF) + Chr$(&h06) + Chr$(cmd1) + Chr$(0) + Chr$(0) + Chr$(arg2) + Chr$(&hEF); Geoff Edited 2024-03-14 15:04 by Geoffg Geoff Graham - http://geoffg.net |
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| Turbo46 Guru Joined: 24/12/2017 Location: AustraliaPosts: 1593 |
Of course. thanks.  I should have checked against some of my work.I normally assemble the message first. Txd$ = Chr$(&h7E) + Chr$(&hFF) + Chr$(&h06) + Chr$(cmd1) + Chr$(0) + Chr$(0) + Chr$(arg2) + Chr$(&hEF) print #2 Txd$; The semicolon suppresses the CR/LF Bill Keep safe. Live long and prosper. |
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| Bill.b Senior Member Joined: 25/06/2011 Location: AustraliaPosts: 225 |
Thank Geoff Working OK now. I closed the comms port as this is part of a program with an other comm port for a bluetooth HC-06 is included in the full program. Bill In the interests of the environment, this post has been constructed entirely from recycled electrons. |
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