very low frequency tech postings - 03 2005
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Fri, 18 Mar 2005
nordic nRF9E5 stuff
the nRF9E5 is
- a 433/868/915Mhz
- GFSK radio transceiver
- max. 10dBm transmit power
- max 53kpbs (manchester encoded)
- integrated 8051 derivate
- similar parts: nRF24E1, nRF24E2, without 8051: nRF905, nRF2401, nRF2402
I have created some notes on the device (hoping to keep it up to date while I work on it).
I am coding in assembler, tools: asx8051 and aslink of the SDCC (small device c compiler)
my nRF9E5 include file
The EEPROM needs a 3 byte header, so for my toolchain, I needed to hack ihx2nRF9E5.pl
an excerpt from the source:
# ihx2nRF9E5.pl (c) by maZZoo [a] maZZoo.de # licensed under GPLv2 # # mangles EEPROM data for an 8051-based nordic semicondictor # nRF9E5 radio transceiver. # # reads an Intel-hex-formatted file from stdin, # writes it to stdout, all output addresses # will be increased by $offset (>=3) # # prepends bytes as the nRF9E5 requires. # # probably does quite the same job as nordic's # eeprep.exe - I never happened to run it. # # usage: # cat aslinkout.ihx | ./ihx2nRF9E5.pl > myeeprom.hex
After hacking the quick-n-dirty perl-script, I found srecord which seems to be able to do the same job; it can handle a wide variety of program formats and operations.
For programming the boot-EEPROM 25C320 I use ponyprog.
posted in /hard | link | comments [2]
Mon, 07 Mar 2005
oldcalendar.pl
in the listed years you can use old calendars from the years printed on the right:
$ ./oldcalendar.pl 2005 2020 100 2005 : 1994 1983 1977 1966 1955 1949 1938 1927 1921 1910 2006 : 1995 1989 1978 1967 1961 1950 1939 1933 1922 1911 2007 : 2001 1990 1979 1973 1962 1951 1945 1934 1923 1917 1906 2008 : 1980 1952 1924 2009 : 1998 1987 1981 1970 1959 1953 1942 1931 1925 1914 2010 : 1999 1993 1982 1971 1965 1954 1943 1937 1926 1915 1909 2011 : 1994 1983 1977 1966 1955 1949 1938 1927 1921 1910 2012 : 1984 1956 1928 2013 : 2002 1991 1985 1974 1963 1957 1946 1935 1929 1918 1907 2014 : 2003 1997 1986 1975 1969 1958 1947 1941 1930 1919 1913 2015 : 1998 1987 1981 1970 1959 1953 1942 1931 1925 1914 2016 : 1988 1960 1932 2017 : 1995 1989 1978 1967 1961 1950 1939 1933 1922 1911 2018 : 2001 1990 1979 1973 1962 1951 1945 1934 1923 1917 1906 2019 : 2002 1991 1985 1974 1963 1957 1946 1935 1929 1918 1907 2020 : 1992 1964 1936 1908sourcecode:
#!/usr/bin/perl -w
# oldcalendar.pl [startyear] [endyear] [recentyears]
#
# prints out the years of old calenders you could use
# in startyear (def=2005) through endyear (def=2010)
# considering calenderyears [startyear-recentyears .. startyear-1]
#
# (c) 2005 Matthias Wenzel
use strict;
sub weekday($$$){
my ($day, $month, $year) = @_;
# see
# http://www.tondering.dk/claus/cal/node3.html#SECTION00360000000000000000
my $a = int( (14 - $month) / 12 );
my $y = $year - $a;
my $m = $month + 12 * $a - 2;
my $d = ( $day + $y + int($y / 4) - int($y / 100) + int($y / 400) + 31 * int($m / 12) ) % 7;
return $d;
}
my $start = 2005;
my $end = 2010;
my $old = 50; # dump $start - $old calenderyears
$start = $ARGV[0] if $ARGV[0];
$end = $ARGV[1] if $ARGV[1];
$old = $ARGV[2] if $ARGV[2];
$end = $start if $start > $end;
my $curr=$start;
while ($curr <= $end){
print $curr . " : ";
my $o = $start - 1;
while ($o ne ($start - $old)){
if (( weekday(1,1,$curr) eq weekday(1,1,$o) ) & ( weekday(31,12,$curr) eq weekday(31,12,$o) )){
print " " . $o;
}
$o--;
}
$curr++;
print "\n";
}
posted in /code | link | comments [0]