Hi, as I got no answer to the problem of printing floats in pic16 port,
I made a small routine to print numbers in the form DDDDD.MMMMMMM to 8
decimal places, it's very simple, but can be useful to somebody else.
The usart_send_2 routine is used to send chars to the serial port, so
can be implemented by the user in different ways.
Olgierd
----------------------
// code
/**
Converts a float number into a string considering 'left_min_zeros'
numbers before the decimal place and 'decimals' decimals
*/
void send_float(float val, unsigned char decimals , unsigned char
left_min_zeros){
unsigned char i,j;
union float_long fl1;
unsigned char sign,et;
char exp;
char int_part[10],dec_part[10];
unsigned long mantissa,mint,mflot,sum_dec,mask,comp;
//Lookup Table of 1e8/2^i for calculation of decimal valued
unsigned long dec_vals[23]={
50000000 ,
25000000 ,
12500000 ,
6250000 ,
3125000 ,
1562500 ,
781250 ,
390625 ,
195312 ,
97656 ,
48828 ,
24414 ,
12207 ,
6103 ,
3051 ,
1525 ,
762 ,
381 ,
190 ,
95 ,
47 ,
23 ,
12 };
fl1.f = val;
sign=SIGN(fl1.l);
exp = EXP (fl1.l) - 127;
mantissa=MANT(fl1.l);
mint=mantissa;
for(i=0;i<23-exp;i++){
mint=mint >> 1;
}
et=9+exp;
mflot = ((mantissa << et) >> 9);
// now do an arithemtic sum of decimals values
sum_dec=0;
for(i=0;i<23;i++){
mask=1ul<<i;
comp=mask & mflot;
if (comp != 0ul ){
sum_dec=sum_dec+dec_vals[22-i];
}
}
// now I print the number
ltoa(mint, int_part, 10);
ltoa(sum_dec, dec_part, 10);
if (sign==1)
usart_send_2('-');
else
usart_send_2(' ');
// check the sizes, reuse the exp variable
exp = left_min_zeros-strlen(int_part);
// do i have to add zeros a beginning
if(exp > 0)
for(i=0;i<exp;i++)
usart_send_2('0');
// send the integer part
send_uint(mint);
usart_send_2('.');
// check the zeros of decimal part, reuse the exp variable
exp = 8-strlen(dec_part);
if(exp > 0)
for(i=0;i<exp;i++)
usart_send_2('0');
// send the decimal part
for(i=0;i<decimals-exp;i++)
usart_send_2(dec_part[i]);
}
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