diff options
Diffstat (limited to 'driver_fw/main.c')
| -rw-r--r-- | driver_fw/main.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/driver_fw/main.c b/driver_fw/main.c index 838ca9d..df2eaa7 100644 --- a/driver_fw/main.c +++ b/driver_fw/main.c @@ -79,12 +79,24 @@ int main(void) { NVIC_EnableIRQ(TIM1_UP_IRQn); NVIC_SetPriority(TIM1_UP_IRQn, 3<<4); - uint8_t txbuf[128]; + +unsigned char x, a, b, c; +unsigned char random() { + x++; //x is incremented every round and is not affected by any other variable + a = (a ^ c ^ x); //note the mix of addition and XOR + b = (b + a); //And the use of very few instructions + c = ((c + (b >> 1) ^ a)); // the AES S-Box Operation ensures an even distributon of entropy + return (c); +} + + + uint8_t txbuf[3] = {0x01, 0x05, 0x01}; int txpos = -1; /* FIXME test code */ - for (int i=0; i<sizeof(txbuf)/sizeof(txbuf[0]); i++) - txbuf[i] = i; + //for (int i=0; i<sizeof(txbuf)/sizeof(txbuf[0]); i++) + // txbuf[i] = i; /* FIXME end test code */ + int i = 0; while (42) { if (txstate.next_symbol == -NO_SYMBOL) { if (txpos == -1) @@ -93,8 +105,18 @@ int main(void) { txstate.next_symbol = xfr_8b10b_encode(&txstate.st, txbuf[txpos]); txpos++; - if (txpos >= sizeof(txbuf)/sizeof(txbuf[0])) + if (txpos >= sizeof(txbuf)/sizeof(txbuf[0])) { txpos = -1; + + i++; + if (i == 2) { + //txbuf[2] = random(); + //txbuf[2] <<= 1; + //if (!txbuf[2] & 0xff) + // txbuf[2] = 0x01; + i = 0; + } + } } } } |