diff options
Diffstat (limited to 'src/drivers/ao_trng.c')
| -rw-r--r-- | src/drivers/ao_trng.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/drivers/ao_trng.c b/src/drivers/ao_trng.c index db742928..e69cd30b 100644 --- a/src/drivers/ao_trng.c +++ b/src/drivers/ao_trng.c @@ -29,7 +29,8 @@ ao_trng_fetch(void) int usb_buf_id; uint16_t i; uint16_t *buf; - uint32_t *rnd; + uint16_t t; + uint32_t *rnd = (uint32_t *) ao_adc_ring; if (!buffer[0]) { buffer[0] = ao_usb_alloc(); @@ -50,10 +51,12 @@ ao_trng_fetch(void) ao_led_on(AO_LED_TRNG_READ); while (count--) { - rnd = (uint32_t *) ao_adc_get(AO_USB_IN_SIZE); /* one 16-bit value per output byte */ + t = ao_adc_get(AO_USB_IN_SIZE) >> 1; /* one 16-bit value per output byte */ buf = buffer[usb_buf_id]; - for (i = 0; i < AO_USB_IN_SIZE / sizeof (uint16_t); i++) - *buf++ = ao_crc_in_32_out_16(*rnd++); + for (i = 0; i < AO_USB_IN_SIZE / sizeof (uint16_t); i++) { + *buf++ = ao_crc_in_32_out_16(rnd[t]); + t = (t + 1) & ((AO_ADC_RING_SIZE>>1) - 1); + } ao_adc_ack(AO_USB_IN_SIZE); ao_led_toggle(AO_LED_TRNG_READ|AO_LED_TRNG_WRITE); ao_usb_write(buffer[usb_buf_id], AO_USB_IN_SIZE); |