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Forum Microcontroller Forum XMC Forum XMC4500 stepping AB Flexible CRC Engine BUG? If this is your first visit, be sure to check out the FAQ . You will have to register before you can post. To start viewing messages, select the forum that you want to visit below.
According to the Reference Manual (xmc4500_rm_v1.4_2014_04.pdf) the resulting CRC value can be obtained from the register RESm at any time. But the fact is, that the FCE needs at least one processor tackt to finish the calculations, e.g.:
Code: uint32_t result; // fisrt implementation FCE_KE0->CRC halfords = 0xFFFFFFFF; // CRC Seed FCE_KE0->IR = 1; FCE_KE0->IR = 2; FCE_KE0->IR = 3; result = FCE_KE0->RES; // <<< WRONG RESULT!!! // second implementation FCE_KE0->CRC = 0xFFFFFFFF; // CRC Seed FCE_KE0->IR = 1; FCE_KE0->IR = 2; FCE_KE0->IR = 3; __NOP(); result halfords = FCE_KE0->RES; // <<< CORRECT RESULT!!! My code is optimized with -O3 flag and executed from PSRAM at 120 MHz.
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