| Line 62... |
Line 62... |
int main(void) {
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int main(void) {
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uint8_t lucky_numbers_5of50[5];
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uint8_t lucky_numbers_5of50[5];
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uint8_t lucky_numbers_2of10[2];
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uint8_t lucky_numbers_2of10[2];
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uint8_t i, j, tmp;
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int err;
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uint16_t trng_data;
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uint8_t i, j, probe;
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uint8_t trng_data;
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unsigned int num_samples;
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unsigned int num_samples;
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// check if UART unit is implemented at all
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// check if UART unit is implemented at all
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if (neorv32_uart_available() == 0) {
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if (neorv32_uart_available() == 0) {
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return 0;
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return 0;
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}
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}
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// capture all exceptions and give debug info via UART
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// capture all exceptions and give debug info via UART
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// this is not required, but keeps us safe
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// this is not required, but keeps us safe
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neorv32_rte_setup();
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neorv32_rte_setup();
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| Line 89... |
Line 89... |
if (neorv32_trng_available() == 0) {
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if (neorv32_trng_available() == 0) {
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neorv32_uart_printf("No TRNG implemented.");
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neorv32_uart_printf("No TRNG implemented.");
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return 0;
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return 0;
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}
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}
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// configure TRNG with defaul GARO tap mask
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// enable TRNG
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neorv32_uart_printf("Configuring TRNG...\n");
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neorv32_trng_enable();
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uint16_t trng_tap_config = neorv32_trng_find_tap_mask();
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neorv32_uart_printf("TRNG: Using tap mask: 0x%x ", (uint32_t)trng_tap_config);
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neorv32_trng_setup(trng_tap_config);
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while(1) {
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while(1) {
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// main menu
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// main menu
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neorv32_uart_printf("\nCommands:\n"
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neorv32_uart_printf("\nCommands:\n"
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| Line 111... |
Line 108... |
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// output RND data
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// output RND data
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if (cmd == 'n') {
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if (cmd == 'n') {
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num_samples = 0;
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num_samples = 0;
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while(1) {
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while(1) {
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if (neorv32_trng_get(&trng_data)) {
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err = neorv32_trng_get(&trng_data);
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neorv32_uart_printf("\nTRNG error!\n");
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if (err) {
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neorv32_uart_printf("\nTRNG error (%i)!\n", err);
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break;
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break;
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}
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}
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neorv32_uart_printf("%u ", (uint32_t)(trng_data & 0xFF));
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neorv32_uart_printf("%u ", (uint32_t)(trng_data));
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num_samples++;
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num_samples++;
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if (neorv32_uart_char_received()) { // abort when key pressed
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if (neorv32_uart_char_received()) { // abort when key pressed
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neorv32_uart_printf("\nPrinted samples: %u", num_samples);
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neorv32_uart_printf("\nPrinted samples: %u", num_samples);
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break;
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break;
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}
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}
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}
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}
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}
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}
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// print lucky numbers
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// print lucky numbers
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if (cmd == 'l') {
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if (cmd == 'l') {
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// reset array
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// reset arrays
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for (i=0; i<5; i++) {
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for (i=0; i<5; i++) {
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lucky_numbers_5of50[i] = 0;
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lucky_numbers_5of50[i] = 0;
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}
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}
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lucky_numbers_2of10[0] = 0;
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lucky_numbers_2of10[0] = 0;
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lucky_numbers_2of10[1] = 0;
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lucky_numbers_2of10[1] = 0;
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// get numbers
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// get numbers
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i = 0;
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i = 0;
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while (i<5) {
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while (i<5) {
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if (neorv32_trng_get(&trng_data)) {
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err = neorv32_trng_get(&trng_data);
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neorv32_uart_printf("\nTRNG error!\n");
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if (err) {
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neorv32_uart_printf("\nTRNG error (%i)!\n", err);
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break;
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break;
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}
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}
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// valid range?
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// valid range?
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tmp = (uint8_t)(trng_data & 0xff);
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if ((trng_data == 0) || (trng_data > 50)) {
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if ((tmp == 0) || (tmp > 50)) {
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continue;
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continue;
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}
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}
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// already sampled?
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// already sampled?
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probe = 0;
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for (j=0; j<5; j++) {
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for (j=0; j<5; j++) {
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if (lucky_numbers_5of50[j] == tmp) {
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if (lucky_numbers_5of50[j] == trng_data) {
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continue;
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probe++;
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}
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}
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}
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}
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lucky_numbers_5of50[i] = tmp;
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if (probe) {
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continue;
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}
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else {
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lucky_numbers_5of50[i] = trng_data;
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i++;
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i++;
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}
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}
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}
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// get numbers part 2
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// get numbers part 2
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i = 0;
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i = 0;
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while (i<2) {
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while (i<2) {
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if (neorv32_trng_get(&trng_data)) {
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err = neorv32_trng_get(&trng_data);
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neorv32_uart_printf("\nTRNG error!\n");
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if (err) {
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neorv32_uart_printf("\nTRNG error (%i)!\n", err);
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break;
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break;
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}
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}
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// valid range?
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// valid range?
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tmp = (uint8_t)(trng_data & 0xff);
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if ((trng_data == 0) || (trng_data > 10)) {
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if ((tmp == 0) || (tmp > 10)) {
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continue;
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continue;
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}
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}
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// already sampled?
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// already sampled?
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probe = 0;
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for (j=0; j<2; j++) {
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for (j=0; j<2; j++) {
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if (lucky_numbers_2of10[j] == tmp) {
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if (lucky_numbers_2of10[j] == trng_data) {
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continue;
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probe++;
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}
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}
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}
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if (probe) {
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continue;
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}
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}
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lucky_numbers_2of10[i] = tmp;
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else {
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lucky_numbers_2of10[i] = trng_data;
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i++;
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i++;
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}
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}
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}
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// output
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// output
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neorv32_uart_printf("\n");
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neorv32_uart_printf("\n");
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for (j=0; j<5; j++) {
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for (j=0; j<5; j++) {
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if (i==4) {
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if (i==4) {
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