I have to following code:
// Write screen n = sprintf( screen_msg, " TV: %#4.1f FV: %#4.1f CV: %#4.1f SV: %#4.1f\r\n", ad_value[2], ad_value[1], ad_value[0], ad_value[3] ); n += sprintf( screen_msg + n, " TI: %#4.1f AT: %#4.1f CT: %#4.1f ST: %#4.1f\r\n", ad_value[4], ad_value[5], ad_value[7], ad_value[6] ); n += sprintf( screen_msg + n, "\r\n" ); n += sprintf( screen_msg + n, "ENGINE CHARGE CLK EN DIS" ); write_0( screen_msg );
When the string is printed to my LCD CV, SV, and ST are always zero, regardless of the value in the ad_value array. If I print just those values in the same routine they appear as they should. When I debug the program the entire string appears as it should. My screen_msg buffer is 256 characters and the entire string in only 170.
I have looked over the code a dozen times and can't figure out what's going on. Can anyone see something that I may be missing?
Thanks, Paul
Does this print valid data?
strcpy(screen_msg,"hello world"); write_0(screen_msg);
Your use of sprintf() should work unless the C51 architecture have specific problems.
But, why bother with sprintf and many, many values when all floats have a common formatting and are stored in an array?
p = screen_msg; for (i = 0; i < 8; i++) { n = sprintf(p,"%s %4.1f ",prompt[i],ad_val[i]); if (n < 0) return FAIL; p += n; } strcpy(p,"\r\nMy final message here"); wrrite_0(screen_buffer);
And, as already mentioned, do consider fixed-point arithemetic for your poor chip.