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--- projects:jimbob:habtrk [2013/06/30 15:02] – [Dev board 1] kevwal
+++ projects:jimbob:habtrk [2013/08/08 16:58] (current) – kevwal
@@ Line 1: / Line 1: @@
-==== Dev board 1 ====
+==== PCB Version 006 Board 1 ====
+NCP1400 Voltage Reg at 1.8v
+ATMega328p Processor at 4Mhz, 1.8v
+uBlox GPS
+RFM22B Radio
+{{http://i.imgur.com/AT0nboq.jpg?nolink&200|}}
+{{http://i.imgur.com/0rDx5Ef.jpg?nolink&200|}}
+==== Programming the Mega ====
 Program fuses using AtmelStudio and Olimex AVR-ISP500 - STK500 programmer.
+The Olimex AVR-ISP500 has an external clock output on ICSP10 pin 3 for rescuing AVRs
+with enabled external clock fuse but no external clock  This clock output can be really
+helpful when target AVR is accidentally programmed with External Clock FUSE option.
+To resurrect it just wire ICSP10 pin 3 to XTAL1 pin of the target AVR chip and initiate a
+programming session to fix the FUSE values.
 Power from external battery.
@@ Line 17: / Line 40: @@
 ^ CKDIV8 | Set | Clr |
 ^ CKOUT | Clr | Clr |
-^ SUT_CKSEL | INTRCOSC_8Mhz_6ck_14ck_65ms |
+^ SUT_CKSEL | INTRCOSC_8Mhz_6ck_14ck_65ms | ExtXOsc_3Mhz_8Mhz_16KCK_14CK_65ms |
+Note Full Swing Crystal Oscillator will only operate for VCC = 2.7 - 5.5 volts
 ^ Setting ^ Default ^ Set ^
-^ Extended | 0xFF |
+^ Extended | 0xFF | 0xFF |
-^ High | 0xD9 |
+^ High | 0xD9 | 0xD9 |
-^ Low | 0x62 |
+^ Low | 0x62 | 0xFD |
 ==== ToDo ====
@@ Line 32: / Line 56: @@
 http://www.jasoncavett.com/2011/03/accessing-watchdog-timer-on-arduino-uno.html
+==== Arduino ====
+Arduinio Software Serial library doesn't support 4mhz clocks - so I created a SoftwareSerial4Mhz with just a 9600 baud line - works fine, verified timing with scope to the best of my ability.
+<code>
+#elif F_CPU == 4000000
+static const DELAY_TABLE table[] PROGMEM =
+{
+  //  baud    rxcenter    rxintra    rxstop  tx
+  { 9600,     19,         54,        54,     51,    },
+};
+const int XMIT_START_ADJUSTMENT = 3;
+</code>
+Arduinio wiring.c does not support 4Mhz clocks, so delays in the code will be wrong I think - either edit your delays (/2) or edit wiring.c
+Added a section to boards.txt to tell the Arduinio IDE about the board:
+<code>
+##############################################################
+HabTrk.name=HabTrk (1.8V, 4 MHz) ATmega328
+HabTrk.build.mcu=atmega328p
+HabTrk.build.f_cpu=4000000L
+HabTrk.build.core=arduino
+HabTrk.build.variant=standard
+</code>
+Added a section to programmers.txt to tell it about my serial Olimex AVR-ISP500, or you can just flash the
+hex file directly from Atmel Studio.
+<code>
+avrispmkiis.name=AVRISP mkII Serial
+avrispmkiis.communication=serial
+avrispmkiis.protocol=stk500v2
+</code>
+==== Checking ====
+Checked frequency of transmission by measuring the pulse width - http://ssreng.com/how-do-i-know-the-baud-rate-of-the-serial-data/
+===== Habhub Payload Config =====
+Using the form [[http://habitat.habhub.org/genpayload/|here]] I generated a payload config:
+Payload Name: G7PMO $$HABTRK
+Primary, 434.150, USB, RTTY, 470, ASCII-7, 50 Baud, Parity none, 1 Stop bits.
+{"type":"payload_configuration","name":"G7PMO $$HABTRK","time_created":"2013-08-03T12:21:33+01:00","metadata":{"description":"G7PMO's HABTRK Tracker"},"transmissions":[{"frequency":434150000,"modulation":"RTTY","mode":"USB","encoding":"ASCII-7","parity":"none","stop":1,"shift":470,"baud":50,"description":"Primary"}],"sentences":[{"protocol":"UKHAS","callsign":"HABTRK","checksum":"crc16-ccitt","fields":[{"name":"sentence_id","sensor":"base.ascii_int"},{"name":"time","sensor":"stdtelem.time"},{"name":"latitude","sensor":"stdtelem.coordinate","format":"dd.dddd"},{"name":"longitude","sensor":"stdtelem.coordinate","format":"dd.dddd"},{"name":"altitude","sensor":"base.ascii_int"},{"name":"satellites","sensor":"base.ascii_int"},{"name":"battery","sensor":"base.ascii_int"},{"name":"temperature_rfm22b","sensor":"base.ascii_int"}],"filters":{"post":[{"filter":"common.numeric_scale","factor":0.001,"round":3,"source":"battery","type":"normal"},{"filter":"common.invalid_gps_lock","ok":[4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20],"source":"satellites","type":"normal"}]},"description":"$$HABTRK Std format"}]}
+Doc ID: e55cc3ffb42062c70087dae3d9520903
+Note the filter I use to identify if I have a satellite fix "{"filter":"common.invalid_gps_lock","type":"normal","ok":[4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20],"source":"satellites"}"
+I should really implement another variable in the sentence to define lock directly for the PUBX code, but I am told the above should do what I want it to do.