RTSA-lab01-CacheAnalysis/test/src/lcdnum.c

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/* MDH WCET BENCHMARK SUITE. */
/* 2012/09/28, Jan Gustafsson <jan.gustafsson@mdh.se>
* Changes:
* - The volatile variable n controls a loop, which is not correct. The loop will not terminate. Fixed.
*/
/***********************************************************************
* FILE: synthetic.c
*
* PURPOSE: demonstrate effect of flow facts for straight loops
*
* IDEA: reading from an in port mapped to a ten-item buffer,
* send first five characters to an LCD as numbers
*
***********************************************************************/
unsigned char num_to_lcd(unsigned char a)
{
/* -0- 1 01
* 1 2 2 4 02 04
* -3- i.e. 8 i.e. 08
* 4 5 16 32 10 20
* -6- 64 40
*
*/
switch(a)
{
case 0x00: return 0;
case 0x01: return 0x24;
case 0x02: return 1+4+8+16+64;
case 0x03: return 1+4+8+32+64;
case 0x04: return 2+4+8+32;
case 0x05: return 1+4+8+16+64;
case 0x06: return 1+2+8+16+32+64;
case 0x07: return 1+4+32;
case 0x08: return 0x7F; /* light all */
case 0x09: return 0x0F + 32 + 64;
case 0x0A: return 0x0F + 16 + 32;
case 0x0B: return 2+8+16+32+64;
case 0x0C: return 1+2+16+64;
case 0x0D: return 4+8+16+32+64;
case 0x0E: return 1+2+8+16+64;
case 0x0F: return 1+2+8+16;
}
return 0;
}
volatile unsigned char IN;
volatile unsigned char OUT;
int main(void)
{
int i;
unsigned char a;
/*volatile*/ int n; /* JG */
n = 10;
for(i=0; i< n; i++)
{
a = IN; /* scan port */
if(i<5)
{
a = a &0x0F;
OUT = num_to_lcd(a);
}
}
return 0;
}