URL
https://opencores.org/ocsvn/neorv32/neorv32/trunk
Subversion Repositories neorv32
Compare Revisions
- This comparison shows the changes necessary to convert path
/neorv32/trunk/sw/example/demo_trng
- from Rev 68 to Rev 69
- ↔ Reverse comparison
Rev 68 → Rev 69
/main.c
99,7 → 99,7
// main menu |
neorv32_uart0_printf("\nCommands:\n" |
" n: Print 8-bit random numbers (abort by pressing any key)\n" |
" h: Generate and print histogram\n"); |
" h: Generate histogram and analyze data\n"); |
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neorv32_uart0_printf("CMD:> "); |
char cmd = neorv32_uart0_getc(); |
154,8 → 154,8
uint32_t hist[256]; |
uint32_t i; |
uint32_t cnt = 0; |
int err = 0; |
uint8_t trng_data; |
uint64_t average = 0; |
|
neorv32_uart0_printf("Press any key to start.\n"); |
|
167,48 → 167,72
hist[i] = 0; |
} |
|
|
// sample random data |
while(1) { |
|
err = neorv32_trng_get(&trng_data); |
// get raw TRNG data |
if (neorv32_trng_get(&trng_data)) { |
continue; |
} |
|
// add to histogram |
hist[trng_data & 0xff]++; |
cnt++; |
|
if (err) { |
neorv32_uart0_printf("\nTRNG error!\n"); |
break; |
} |
// average |
average += (uint64_t)trng_data; |
|
if (neorv32_uart0_char_received()) { // abort when key pressed |
// abort conditions |
if ((neorv32_uart0_char_received()) || // abort when key pressed |
(cnt & 0x80000000UL)) { // to prevent overflow |
break; |
} |
} |
|
if (cnt & 0x80000000UL) { // to prevent overflow |
break; |
average = average / cnt; |
|
|
// deviation (histogram samples) |
uint32_t avg_occurence = cnt / 256; |
int32_t tmp_int; |
int32_t dev_int; |
int32_t dev_int_max = 0x80000000UL; uint32_t bin_max = 0; |
int32_t dev_int_min = 0x7fffffffUL; uint32_t bin_min = 0; |
int32_t dev_int_avg = 0; |
for (i=0; i<256; i++) { |
tmp_int = (int32_t)hist[i]; |
dev_int = tmp_int - avg_occurence; |
|
dev_int_avg += (uint64_t)dev_int; |
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if (dev_int < dev_int_min) { |
dev_int_min = dev_int; |
bin_min = i; |
} |
if (dev_int > dev_int_max) { |
dev_int_max = dev_int; |
bin_max = i; |
} |
} |
|
dev_int_avg = dev_int_avg / 256; |
|
// print histogram |
neorv32_uart0_printf("Histogram [random data value] : [# occurences]\n"); |
neorv32_uart0_printf("Histogram [random data value] : [# occurrences]\n"); |
for (i=0; i<256; i++) { |
neorv32_uart0_printf("%u: %u\n", (uint32_t)i, hist[i]); |
} |
neorv32_uart0_printf("\n"); |
|
neorv32_uart0_printf("\nSamples: %u\n", cnt); |
|
// average |
uint64_t average = 0; |
for (i=0; i<256; i++) { |
average += (uint64_t)hist[i] * i; |
} |
average = average / ((uint64_t)cnt); |
neorv32_uart0_printf("Average value: %u ", (uint32_t)average); |
|
if (((uint8_t)average) == ((uint8_t)(255/2))) { |
neorv32_uart0_printf("%c[1m[TEST OK]%c[0m\n", 27, 27); |
} |
else { |
neorv32_uart0_printf("%c[1m[TEST FAILED]%c[0m\n", 27, 27); |
} |
|
// print results |
neorv32_uart0_printf("Analysis results (integer only)\n\n"); |
neorv32_uart0_printf("Number of samples: %u\n", cnt); |
neorv32_uart0_printf("Arithmetic mean: %u\n", (uint32_t)average); |
neorv32_uart0_printf("\nArithmetic deviation\n"); |
neorv32_uart0_printf("Avg. occurrence: %u\n", avg_occurence); |
neorv32_uart0_printf("Avg. deviation: %i\n", dev_int_avg); |
neorv32_uart0_printf("Minimum: %i (histogram bin %u)\n", dev_int_min, bin_min); |
neorv32_uart0_printf("Maximum: %i (histogram bin %u)\n", dev_int_max, bin_max); |
} |