43 lines
796 B
C
43 lines
796 B
C
#include "mmio.h"
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#define GCD_STATUS 0x2000
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#define GCD_X 0x2004
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#define GCD_Y 0x2008
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#define GCD_GCD 0x200C
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unsigned int gcd_ref(unsigned int x, unsigned int y) {
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while (y != 0) {
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if (x > y)
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x = x - y;
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else
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y = y - x;
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}
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return x;
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}
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// DOC include start: GCD test
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int main(void)
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{
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uint32_t result, ref, x = 20, y = 15;
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// wait for peripheral to be ready
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while ((reg_read8(GCD_STATUS) & 0x2) == 0) ;
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reg_write32(GCD_X, x);
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reg_write32(GCD_Y, y);
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// wait for peripheral to complete
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while ((reg_read8(GCD_STATUS) & 0x1) == 0) ;
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result = reg_read32(GCD_GCD);
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ref = gcd_ref(x, y);
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if (result != ref) {
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printf("Hardware result %d does not match reference value %d\n", result, ref);
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return 1;
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}
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return 0;
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}
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// DOC include end: GCD test
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