28 lines
522 B
C
28 lines
522 B
C
#include <stdint.h>
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#include "random.h"
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#include "xxtea.h"
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#include "core/adc/adc.h"
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#define STATE_SIZE 8
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uint32_t state[STATE_SIZE];
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uint32_t const I[4] = {12,13,14,15};
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void randomInit(void)
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{
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uint32_t i,j,x;
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for(j=0; j<STATE_SIZE; j++){
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x = 0;
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for(i=0; i<10240; i++){
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x ^= (adcRead(1)&1)<<(i%32);
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}
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state[j] = x;
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}
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xxtea_encode_words(state, STATE_SIZE, I);
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}
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uint32_t getRandom(void)
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{
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xxtea_encode_words(state, STATE_SIZE, I);
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return state[0];
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}
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