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