Dec 172016
 

code below

/*=========================================================================== * Serial Port Programming in C (Serial Port Write) * Non Cannonical mode * Program writes a character to the serial port at 19200 bps 8N1 format *--------------------------------------------------------------------------- * original Programmer : Rahul.S * Date : 21-December-2014 *============================================================================ * altered by : Alex the Engineer * rtn VFRmedia the Rat's nest * Ipswich GB * to work with x86 netbook connected to Sparkfun thermal printer * via USB-TTL serial converter * Date : 2016-05-29 * 2016-05-30 : code recompiled to ZX-SL91 * (old Tosh amd64 laptop with busted keyboard repurposed as mini * server * ---------------------------------------------------------------------------- * 2016-06-10 : sourcecode formatting cleaned up a bit *============================================================================== /*-------------------------------------------------------------*/ /* termios structure - /usr/include/asm-generic/termbits.h */ /* use "man termios" to get more info about termios structure */ /*-------------------------------------------------------------*/ #include <stdio.h> #include <fcntl.h> /* File Control Definitions */ #include <string.h> /* strings */ #include <termios.h> /* POSIX Terminal Control Definitions */ #include <unistd.h> /* UNIX Standard Definitions */ #include <errno.h> /* ERROR Number Definitions */ /* global vars - probably shouldn't be hardcoded like this */ /* and some should be #defines to save memory */ /* but better than sticking them into the sourcecode */ int bytes_written = 0; /* Buffer containing characters to write into port */ char *write_buffer = "\x1b@\n\n\n" "\x1b\x0ertn\n" "telecommunicatie\x1b\x14\n" "printertest ZX-SL91\n" "\nAchtung! Achtung!\n" "The Goose is Loose!\n" "\x1d\x48\x03\n"; char *msg2= "\x1b@" "rtn :miauw naar de maan!\n\n\n\n\n"; char *barcode128n= "\x1d\x6bI"; char *item1= "2815 doedelzak"; char *item2= "9502 asbak "; char *item3= "7281 snakeoil "; char *lin_adv= "\n"; int main(void) { int fd; /*File Descriptor*/ printf("\n +----------------------------------+"); printf("\n | Serial Port Write |"); printf("\n +----------------------------------+"); /*------------------------------- Opening the Serial Port ------*/ /* Change /dev/ttyUSB0 to the one corresponding to your system */ fd = open("/dev/ttyUSB0",O_RDWR | O_NOCTTY | O_NDELAY); /* ttyUSB0 is the FT232 based USB2SERIAL Converter */ /* O_RDWR Read/Write access to serial port */ /* O_NOCTTY - No terminal will control the process */ /* O_NDELAY -Non Blocking Mode,Does not care about- */ /* -the status of DCD line,Open() returns immediatly */ if(fd == -1) { /* Error Checking */ perror("\n Error! in Opening ttyUSB0 "); return -1; } else perror("\n ttyUSB0 Opened Successfully "); /* set tty attrs 19200 8N1 */ struct termios SerialPortSettings; tcgetattr(fd, &SerialPortSettings); cfsetispeed(&SerialPortSettings,B19200); cfsetospeed(&SerialPortSettings,B19200); SerialPortSettings.c_cflag &= ~PARENB; SerialPortSettings.c_cflag &= ~CSTOPB; SerialPortSettings.c_cflag &= ~CSIZE; SerialPortSettings.c_cflag |= CS8; SerialPortSettings.c_cflag &= ~CRTSCTS; SerialPortSettings.c_cflag |= CREAD | CLOCAL; SerialPortSettings.c_iflag &= ~(IXON | IXOFF | IXANY); SerialPortSettings.c_iflag &= ~(ICANON | ECHO | ECHOE | ISIG); SerialPortSettings.c_oflag &= ~OPOST;/*No Output Processing*/ /* Set the attributes to the termios structure*/ if((tcsetattr(fd,TCSANOW,&SerialPortSettings)) != 0) { perror ("\n ERROR! in set attrs"); return -1; } else printf("\n ttyUSB0 set to 19200-8N1\n"); bytes_written = str_send(fd,write_buffer); printf("\n Sending these 3 barcode:\n%s\n%s\n%s\n",item1,item2,item3); bytes_written += bc128_send(fd,item1); bytes_written += bc128_send(fd,item2); bytes_written += bc128_send(fd,item3); bytes_written += str_send(fd,msg2); printf("\n %d Bytes written to ttyUSB0", bytes_written); printf("\n +----------------------------------+\n\n"); close(fd);/* Close the Serial port */ } /* str_send : write string of bytes to the serial port */ /* specified by fd */ /* returns number of bytes written */ int str_send (int fd, char *msg) { return write(fd,msg,strlen(msg)); } /* bc128_send : send code128 barcode from string */ /* create code 128 barcode - Achtung! uses fixed length sequence */ /* with hardcoded length of 14 (0x0e) sent to printer */ /* which must be specified as a string even though it is only 1 byte */ /* or wrong data is sent down the line */ /* and the barcodes do not print */ int bc128_send (int fd, char *barcode) { int bcount = 0; bcount += write(fd,barcode128n,3); bcount += write(fd,"\x0e",1); bcount += write(fd,barcode,14); return bcount; }
printertest
Aug 132016
 

The CCTV at work was upgraded;  I got to recover the old DVR and have repurposed it alongside a cheap camera mounted at low level to watch cats and other creatures in my garden. It is better than normal British TV, like having your own personal nature channel 🙂

all creatures great and small :)

The statue of the Blessed Virgin Mary also reminds me to take care with the metal box as its a 230V to 12V psu where I mislaid the case screws, there is 230V mains on terminals inside it)

catcam monitor

This cat is the ringleader, but he shares the space with around 5 others and seems to even encourage them to visit my garden…

catcam

One bonus of this arrangement is if I see a cat I can sometimes then photograph it with a better camera (the kitties are often surprised that I seem to know where they are 🙂 )

moar kittehs

cats

Kätzin, interrupted....

Interestingly they seem to behave better since the CCTV was installed; they do not fight each other and make noise with miauwing at night nor foul this side of the garden.

It is not just cats either I see on the camera…

Hedgehog seen on the catcam!

Apologies for poor quality but that is a hedgehog. Apparently these are getting rare in some bits of England so I reported the sighting to Suffolk Wildlife Trust who put it on their map. A lot of folk seem to feed hedgehogs with cat food, I wonder if they are actually following the cats around (they are too big and well protected for lazy town cats to bother with them as prey)…

Aug 132016
 

There do seem to be folk who actually read this / stumble across the blog perhaps through searching for random tech stuff in spite of me rarely promoting it I thought I’d post an update and what I hope to do with this space..

Unfortunately last year I had to deal with a family bereavement as well as health problems/tiredness/burnout; often after I have finished with work-related tasks (which I try and prioritise my energy towards as I am lucky to have a very understanding and accomodating employer) I am way too tired for much else, such as music/creative stuff such as photography and tech/electronic projects.

Also slowly realising I am getting older and have had to make some different lifestyle choices; much less partying and late nights compared to my nearly two decades as a raver, DJ, party promoter etc. All good fun but starting to get a bit much in the end.

This has slightly reduced my enthusiasm for “harder” electronic music, so I have temporarily removed the online radiostation VFR Europe from here (as I hadn’t got the time to curate, upload and schedule content, let alone work on my home studio) although it will hopefully return in the future.

For those who want music there is still plenty on www.partyvibe.com

The good news is I am slowly regaining energy as well as getting into a better routine of sleep patterns, eating etc than in my “youth” (I still don’t consider myself to be old!) and there are still things I get up to I can blog about so hope to be posting here more often.

I don’t do “social networks” much – I (re)tweet occasionally at @vfrmedia (when I get round to it will add the twitter sidebar) and have no desire to become a “social media star” so this blog isn’t going to contain the latest “hip” technology; but will reflect my diverse tech/engineering interests (including “retro” stuff such as my reignited interest in fountain pens) as well as nature/and environment related content….

Feb 062016
 

Since putting this project on Youtube I’ve had a surprising amount of interest from across the world about the modifications I made to the original code from ON1ARF ( a radioamateur in België) to allow 1200 and 2400 bps pager transmissions as well as the default 512bps (I wanted to use the circuit to test commercial POCSAG pager receivers used at one site at my work).

The original code is here

https://github.com/on1arf/pocsag

To get 1200 and 2400 bps you must alter the radiohead libraries it depends on.

Two files must change – the first is RH_RF22.cpp. The code snippet is below (cut and paste this into your editor)

// These are indexed by the values of ModemConfigChoice // Canned modem configurations generated with // http://www.hoperf.com/upload/rf/RH_RF22B%2023B%2031B%2042B%2043B%20Register%20Settings_RevB1-v5.xls // Stored in flash (program) memory to save SRAM PROGMEM static const RH_RF22::ModemConfig MODEM_CONFIG_TABLE[] = { { 0x2b, 0x03, 0xf4, 0x20, 0x41, 0x89, 0x00, 0x36, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x10, 0x62, 0x2c, 0x00, 0x08 }, // Unmodulated carrier { 0x2b, 0x03, 0xf4, 0x20, 0x41, 0x89, 0x00, 0x36, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x10, 0x62, 0x2c, 0x33, 0x08 }, // FSK, PN9 random modulation, 2, 5 // All the following enable FIFO with reg 71 // 1c, 1f, 20, 21, 22, 23, 24, 25, 2c, 2d, 2e, 58, 69, 6e, 6f, 70, 71, 72 // FSK, No Manchester, Max Rb err <1%, Xtal Tol 20ppm { 0x2b, 0x03, 0xf4, 0x20, 0x41, 0x89, 0x00, 0x36, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x10, 0x62, 0x2c, 0x22, 0x08 }, // 2, 5 { 0x1b, 0x03, 0x41, 0x60, 0x27, 0x52, 0x00, 0x07, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x22, 0x3a }, // 2.4, 36 { 0x1d, 0x03, 0xa1, 0x20, 0x4e, 0xa5, 0x00, 0x13, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x27, 0x52, 0x2c, 0x22, 0x48 }, // 4.8, 45 { 0x1e, 0x03, 0xd0, 0x00, 0x9d, 0x49, 0x00, 0x45, 0x40, 0x0a, 0x20, 0x80, 0x60, 0x4e, 0xa5, 0x2c, 0x22, 0x48 }, // 9.6, 45 { 0x2b, 0x03, 0x34, 0x02, 0x75, 0x25, 0x07, 0xff, 0x40, 0x0a, 0x1b, 0x80, 0x60, 0x9d, 0x49, 0x2c, 0x22, 0x0f }, // 19.2, 9.6 { 0x02, 0x03, 0x68, 0x01, 0x3a, 0x93, 0x04, 0xd5, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x09, 0xd5, 0x0c, 0x22, 0x1f }, // 38.4, 19.6 { 0x06, 0x03, 0x45, 0x01, 0xd7, 0xdc, 0x07, 0x6e, 0x40, 0x0a, 0x2d, 0x80, 0x60, 0x0e, 0xbf, 0x0c, 0x22, 0x2e }, // 57.6. 28.8 { 0x8a, 0x03, 0x60, 0x01, 0x55, 0x55, 0x02, 0xad, 0x40, 0x0a, 0x50, 0x80, 0x60, 0x20, 0x00, 0x0c, 0x22, 0xc8 }, // 125, 125 // { 0x2b, 0x03, 0xa1, 0xe0, 0x10, 0xc7, 0x00, 0x09, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x04, 0x32, 0x2c, 0x22, 0x04 }, // 512 baud, FSK, 2.5 Khz fd for POCSAG compatibility { 0x27, 0x03, 0xa1, 0xe0, 0x10, 0xc7, 0x00, 0x06, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x09, 0xd5, 0x2c, 0x22, 0x07 }, // 1200 baud, FSK, 4.5 Khz fd for POCSAG compatibility // { 0x27, 0x03, 0xa1, 0xe0, 0x10, 0xc7, 0x00, 0x06, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x04, 0x32, 0x2c, 0x22, 0x07 }, // 512 baud, FSK, 4.5 Khz fd for POCSAG compatibility // 2400 bps { 0x27, 0x03, 0xa1, 0xe0, 0x10, 0xc7, 0x00, 0x06, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x22, 0x07 },// 2400 baud, FSK, 4.5 Khz fd for POCSAG compatibility // GFSK, No Manchester, Max Rb err <1%, Xtal Tol 20ppm // These differ from FSK only in register 71, for the modulation type { 0x2b, 0x03, 0xf4, 0x20, 0x41, 0x89, 0x00, 0x36, 0x40, 0x0a, 0x1d, 0x80, 0x60, 0x10, 0x62, 0x2c, 0x23, 0x08 }, // 2, 5 { 0x1b, 0x03, 0x41, 0x60, 0x27, 0x52, 0x00, 0x07, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x23, 0x3a }, // 2.4, 36 { 0x1d, 0x03, 0xa1, 0x20, 0x4e, 0xa5, 0x00, 0x13, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x27, 0x52, 0x2c, 0x23, 0x48 }, // 4.8, 45 { 0x1e, 0x03, 0xd0, 0x00, 0x9d, 0x49, 0x00, 0x45, 0x40, 0x0a, 0x20, 0x80, 0x60, 0x4e, 0xa5, 0x2c, 0x23, 0x48 }, // 9.6, 45 { 0x2b, 0x03, 0x34, 0x02, 0x75, 0x25, 0x07, 0xff, 0x40, 0x0a, 0x1b, 0x80, 0x60, 0x9d, 0x49, 0x2c, 0x23, 0x0f }, // 19.2, 9.6 { 0x02, 0x03, 0x68, 0x01, 0x3a, 0x93, 0x04, 0xd5, 0x40, 0x0a, 0x1e, 0x80, 0x60, 0x09, 0xd5, 0x0c, 0x23, 0x1f }, // 38.4, 19.6 { 0x06, 0x03, 0x45, 0x01, 0xd7, 0xdc, 0x07, 0x6e, 0x40, 0x0a, 0x2d, 0x80, 0x60, 0x0e, 0xbf, 0x0c, 0x23, 0x2e }, // 57.6. 28.8 { 0x8a, 0x03, 0x60, 0x01, 0x55, 0x55, 0x02, 0xad, 0x40, 0x0a, 0x50, 0x80, 0x60, 0x20, 0x00, 0x0c, 0x23, 0xc8 }, // 125, 125 // OOK, No Manchester, Max Rb err <1%, Xtal Tol 20ppm { 0x51, 0x03, 0x68, 0x00, 0x3a, 0x93, 0x01, 0x3d, 0x2c, 0x11, 0x28, 0x80, 0x60, 0x09, 0xd5, 0x2c, 0x21, 0x08 }, // 1.2, 75 { 0xc8, 0x03, 0x39, 0x20, 0x68, 0xdc, 0x00, 0x6b, 0x2a, 0x08, 0x2a, 0x80, 0x60, 0x13, 0xa9, 0x2c, 0x21, 0x08 }, // 2.4, 335 { 0xc8, 0x03, 0x9c, 0x00, 0xd1, 0xb7, 0x00, 0xd4, 0x29, 0x04, 0x29, 0x80, 0x60, 0x27, 0x52, 0x2c, 0x21, 0x08 }, // 4.8, 335 { 0xb8, 0x03, 0x9c, 0x00, 0xd1, 0xb7, 0x00, 0xd4, 0x28, 0x82, 0x29, 0x80, 0x60, 0x4e, 0xa5, 0x2c, 0x21, 0x08 }, // 9.6, 335 { 0xa8, 0x03, 0x9c, 0x00, 0xd1, 0xb7, 0x00, 0xd4, 0x28, 0x41, 0x29, 0x80, 0x60, 0x9d, 0x49, 0x2c, 0x21, 0x08 }, // 19.2, 335 { 0x98, 0x03, 0x9c, 0x00, 0xd1, 0xb7, 0x00, 0xd4, 0x28, 0x20, 0x29, 0x80, 0x60, 0x09, 0xd5, 0x0c, 0x21, 0x08 }, // 38.4, 335 { 0x98, 0x03, 0x96, 0x00, 0xda, 0x74, 0x00, 0xdc, 0x28, 0x1f, 0x29, 0x80, 0x60, 0x0a, 0x3d, 0x0c, 0x21, 0x08 }, // 40, 335 };
RH_RF22.cpp

Also the header file RH_RF22.h must change so the modemconfig table has values that reflect the changed modulation schemes.

typedef enum { UnmodulatedCarrier = 0, ///< Unmodulated carrier for testing FSK_PN9_Rb2Fd5, ///< FSK, No Manchester, Rb = 2kbs, Fd = 5kHz, PN9 random modulation for testing FSK_Rb2Fd5, ///< FSK, No Manchester, Rb = 2kbs, Fd = 5kHz FSK_Rb2_4Fd36, ///< FSK, No Manchester, Rb = 2.4kbs, Fd = 36kHz FSK_Rb4_8Fd45, ///< FSK, No Manchester, Rb = 4.8kbs, Fd = 45kHz FSK_Rb9_6Fd45, ///< FSK, No Manchester, Rb = 9.6kbs, Fd = 45kHz FSK_Rb19_2Fd9_6, ///< FSK, No Manchester, Rb = 19.2kbs, Fd = 9.6kHz FSK_Rb38_4Fd19_6, ///< FSK, No Manchester, Rb = 38.4kbs, Fd = 19.6kHz FSK_Rb57_6Fd28_8, ///< FSK, No Manchester, Rb = 57.6kbs, Fd = 28.8kHz FSK_Rb125Fd125, ///< FSK, No Manchester, Rb = 125kbs, Fd = 125kHz FSK_Rb_1200Fd4_5, ///< FSK, No Manchester, Rb = 1200bs, Fd = 4.5kHz, for POCSAG compatibility // FSK_Rb_512Fd4_5, ///< FSK, No Manchester, Rb = 512bs, Fd = 4.5kHz, for POCSAG compatibility FSK_Rb_2400Fd4_5, ///< FSK, No Manchester, Rb = 2400bs, Fd = 4.5kHz, for POCSAG compatibility GFSK_Rb2Fd5, ///< GFSK, No Manchester, Rb = 2kbs, Fd = 5kHz GFSK_Rb2_4Fd36, ///< GFSK, No Manchester, Rb = 2.4kbs, Fd = 36kHz GFSK_Rb4_8Fd45, ///< GFSK, No Manchester, Rb = 4.8kbs, Fd = 45kHz GFSK_Rb9_6Fd45, ///< GFSK, No Manchester, Rb = 9.6kbs, Fd = 45kHz GFSK_Rb19_2Fd9_6, ///< GFSK, No Manchester, Rb = 19.2kbs, Fd = 9.6kHz GFSK_Rb38_4Fd19_6, ///< GFSK, No Manchester, Rb = 38.4kbs, Fd = 19.6kHz GFSK_Rb57_6Fd28_8, ///< GFSK, No Manchester, Rb = 57.6kbs, Fd = 28.8kHz GFSK_Rb125Fd125, ///< GFSK, No Manchester, Rb = 125kbs, Fd = 125kHz OOK_Rb1_2Bw75, ///< OOK, No Manchester, Rb = 1.2kbs, Rx Bandwidth = 75kHz OOK_Rb2_4Bw335, ///< OOK, No Manchester, Rb = 2.4kbs, Rx Bandwidth = 335kHz OOK_Rb4_8Bw335, ///< OOK, No Manchester, Rb = 4.8kbs, Rx Bandwidth = 335kHz OOK_Rb9_6Bw335, ///< OOK, No Manchester, Rb = 9.6kbs, Rx Bandwidth = 335kHz OOK_Rb19_2Bw335, ///< OOK, No Manchester, Rb = 19.2kbs, Rx Bandwidth = 335kHz OOK_Rb38_4Bw335, ///< OOK, No Manchester, Rb = 38.4kbs, Rx Bandwidth = 335kHz OOK_Rb40Bw335 ///< OOK, No Manchester, Rb = 40kbs, Rx Bandwidth = 335kHz } ModemConfigChoice;
RH_RF22.h

the rest can then be used as normal – remember to alter the main Arduino sketch code to select these new bps rates.

NB: I am based in the UK/Europe; we always use wide deviation for POCSAG signals (although much other PMR traffic is now on narrow deviation).

If your country’s Communications Ministry requires narrow deviation to be used you will have to recalculate the modem settings using the spreadsheet referred to in the library files. (Its not as bad as it might seem; I had to use it to get the 1200/2400bps settings and I am not an RF nor a coding expert by any means)