I feel that I must be missing some tricks. I discovered the RTCC module and started using it rather than incrementing global "seconds", "minutes", "hours", "dayOfMonth", "month", and "year" myself on an timer based interrupt event. However, now if I want to extract a timestamp from the module I end up re-constituting the no. of seconds from 2 vars which are contained within the same 16bit field, so even though the C looks a bit messy, the assembly is much worse because it needs to extract the fields which xc16 has shielded me from.
eg. previously to format the time into a string I would run this
However now I need to run this.
It doesn't seem like progress to me. I feel that there should be an easier way to extract the no. of seconds from the RTCC module than the below
Sure I'm getting the calendar with leap-years for free, but the code to increment on a second interrupt was straightforward and very efficient. I'm now losing a lot more instructions formating the current time than the cost of executing the below every second.
eg. previously to format the time into a string I would run this
Code:
sprintf(str,"%02hu:%02hu:%02hu",hours,minutes,seconds);
Code:
sprintf(str,"%01hu%01hu:%01hu%01hu:%01hu%01hu",TIMEHbits.HRTEN,TIMEHbits.HRONE,TIMEHbits.MINTEN,TIMEHbits.MINONE,TIMELbits.SECTEN,TIMELbits.SECONE);
Code:
194: second = TIMELbits.SECTEN*10 + TIMELbits.SECONE;
00DF6A 800EE2 MOV TIMEL, W2
00DF6C DE114C LSR W2, #12, W2
00DF6E 800EE4 MOV TIMEL, W4
00DF70 DE2248 LSR W4, #8, W4
00DF72 610167 AND W2, #0x7, W2
00DF74 B9116A MUL.SU W2, #10, W2
00DF76 62026F AND W4, #0xF, W4
00DF78 420102 ADD W4, W2, W2
Code:
static const short nDay[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
/* Real Time Clock */
if (++rtcMilli >= 1000) {
rtcMilli = 0;
if (++rtcSec >= 60) {
rtcSec = 0;
if (++rtcMin >= 60) {
rtcMin = 0;
if (++rtcHour >= 24) {
rtcHour = 0;
short n = nDay[rtcMon - 1];
if ((n == 28) && !(rtcYear & 3)) n++;
if (++rtcMday > n) {
rtcMday = 1;
if (++rtcMon > 12) {
rtcMon = 1;
rtcYear++;
}
}
}
}
}
}
