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Re: I can´t communicate with a motorola 68hc11 on a BotBoard
PCBUG11 doesn't work with modern computers. 500MHz or less AMD/Pentium can be way too fast :). Google for winbug11.
1. Try QT4
2. The worst case stack oriented HC08 FP implementation should
require no more than 2*4(single prec arguments)+2(return address)+
<4(for temporary argument storage)+optional1(sign)+optional1(exp).
So max 16 bytes. You have 128 and I don't see your problem.
3. Google IEEE754
4. Take...
ieee754 vb
Does VB have pointers? I think yes. Then try to convert
this
float a;
char a1,a2,a3,a4;
a1=*(char*)&a;
a2=*((char*)&a +1);
a3=*((char*)&a +2);
a4=*((char*)&a +3);
Compiled for little endian cpu a1 will contain lowest bits of mantissa and
a4 mantissa sign+7msb of biased exponent...
uip vs lwip
uIP is good for every small MCU. It requires as little RAM as
is needed for single TCP/IP packet. RAM usage is really very low.
http://dunkels.com/adam/uip/
Connectors and physical layer are custom :). Depends were are you
going to connect.
Typical transceivers are Philips TJA1050(newer) and PC82C250(older).
For MEBI interfacing check www.hc12web.de . RAM.Bo256 for
schematic and
https://www.hc12web.de/rambo32/index.html for explanation.
Best CAN example is here
**broken link removed**
Check Microchip application notes:
**broken link removed**
8kBytes? Standard defines max 8 data bytes in data message.
You have to split your data.
Check standards:
**broken link removed**
No, they don't . Headers contain declaration's of variables and types and
declarations of functions(prototypes).
No obligations or special rules for headers.
You can declare everything when you need to.
If main.c makes calls to external modules you can declare external
functions/variables in...
Hi, GrandElf
If you are lerning C avoid when you can any multitasking OS. It's another big thing to learn.
I didn't undestand what you are trying to do. You moved CancelCall()
to another *.c module? If yes declare CancelCall() in you main module.
void CancelCall(void); // declares...
frequency of pwm on 20 mhz crystal
1. HC11 with 2MHz Eclock can generate in best case 7.8125kHz PWM
output with 8bits of resolution, not 15kHz. + It hasn't hardware PWM
generator -so it's difficult to generate outputs for near to minimum and
maximum output values. 2kHz sounds more real.
2...
increase the frequency of a pwm
For 8 bits and 4MHz busclock (crystal is 16MHz):
Max PWM frequency= 4000000/256=15625Hz.
No way to achieve higher frequency without lowering of resolution.
For 60KHz PWM period should be 4E6/60k=66-67 ticks of E-clock or
little more than 6 bits of resolution...
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