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kmp84
Joined: 02 Feb 2010 Posts: 345
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Hardware Uart in 9 bit mode [Solved] |
Posted: Thu Jul 27, 2017 2:29 pm |
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Hello All,
I want to ask you if this is the right way to use hardware uart in 9 bit addressing mode.
Example:
Code: |
#use rs232(baud=9600,rcv=PIN_C7,xmit=PIN_C6,bits=9,ERRORS,stream=B485)
#bit ninth_bit = RS232_ERRORS.7
byte TestPacket[] = {0x07, 0x01, 0x01, 0x00, 0x08, 0x1A, 0x00, 0x2B};
void SendDataToB(int8 *data, int8 len){
int8 i;
for(i = 0; i < len; i++){
if(i == 0)
ninth_bit=1;
else
ninth_bit=0;
fputc(data[i], B485); // Send data
}
} |
I'm sending an example "TestPacket" but the device is not responding.
What could be the problem?
Thanks for attention!
Last edited by kmp84 on Thu Jul 27, 2017 3:01 pm; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010 Posts: 19369
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Posted: Thu Jul 27, 2017 2:34 pm |
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You don't have to.
Assuming a reasonably modern compiler, when set to 9bit mode, the getc, and putc instructions will accept a 16bit value, and handle the extra bit automatically (the functions are 'overloaded', and if they see a 16bit value, switch operation to handle this). |
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temtronic
Joined: 01 Jul 2010 Posts: 9174 Location: Greensville,Ontario
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Posted: Thu Jul 27, 2017 2:44 pm |
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I have a question...
You have 'stream=B485' in the USE RS232(...options...)
To me, that implies you're using an RS485 transceiver. If so, you also need to declare the 'control' pin for the TXX/RXD of the RS485 device. Unless it being used ONLY for one direction of data.
Also, if RS485 is being used, you need to use the correct pullup/pull down and termination resistors. These will be detailed in the RS485 device datasheet.
Jay |
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kmp84
Joined: 02 Feb 2010 Posts: 345
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Posted: Thu Jul 27, 2017 2:46 pm |
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Hi Mr.Ttelmah,
How to handle 9 bit? Some example please?
Thanks, |
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kmp84
Joined: 02 Feb 2010 Posts: 345
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Posted: Thu Jul 27, 2017 2:55 pm |
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temtronic wrote: | I have a question...
You have 'stream=B485' in the USE RS232(...options...)
To me , that implies you're using an RS485 transceiver. If so, you also need to declare the 'control' pin for the TXX/RXD of the RS485 device. Unless it being used ONLY for one direction of data.
Also, if RS485 is being used, you need to use the correct pullup/pull down and termination resistors. These will be detailed in teh RS485 device datasheet.
Jay |
At the moment I'm using rs232 , but hardware also has and rs485 with this settings :
Code: |
#use rs232(baud=9600,rcv=PIN_C7,xmit=PIN_C6,enable=pin_B2,bits=9,ERRORS,stream=B485) |
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temtronic
Joined: 01 Jul 2010 Posts: 9174 Location: Greensville,Ontario
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Posted: Thu Jul 27, 2017 5:22 pm |
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OK... what does the device use for communications? RS232 or RS485 ?? There is a BIG difference in the hardware AND then there's the software side to consider.
You cannot just connect a PIC up directly to the 'device', you need the correct interface chip(s).
If the 'device' is a commercial product, provide a link to the datasheet. That will help us.
'Not working' could be you've got a bare PIC tied to the device, you have TXD and RXD swapped, missing ground between devices, MAX232 tied to MAX485, and that's just a start of possibles....
Happy to help but I need more details about the project.
Jay |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Thu Jul 27, 2017 7:37 pm |
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Quote: | I want to ask you if this is the right way to use hardware uart in 9 bit addressing mode. |
CCS gives examples of how to do this in the RS485.c file, in the drivers folder.
UART setup:
Code: | #use rs232(baud=9600, xmit=RS485_TX_PIN, rcv=RS485_RX_PIN, enable=RS485_ENABLE_PIN, bits=9, long_data, errors, stream=RS485) |
Look at this function in the RS485.c file:
Code: | int1 rs485_send_message(unsigned int8 to, unsigned int8 len, unsigned int8* data) {
.
.
.
} |
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kmp84
Joined: 02 Feb 2010 Posts: 345
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Problem Solved |
Posted: Tue Aug 15, 2017 4:13 pm |
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Hello All,
Sorry for my delayed response. I did not have for a long time PC and internet connection.
I have made successful communication in "9 bit long_data" format with hardware uart and also with software uart over physical rs232 and rs485.
Thank you very much ! |
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