diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/drivers/ao_trng_send.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/src/drivers/ao_trng_send.c b/src/drivers/ao_trng_send.c index 63366d3e..11f441f8 100644 --- a/src/drivers/ao_trng_send.c +++ b/src/drivers/ao_trng_send.c @@ -22,7 +22,8 @@ #include <ao_exti.h> #include <ao_power.h> -static uint8_t trng_running; +static uint8_t trng_running; +static AO_TICK_TYPE trng_power_time; static void ao_trng_send_raw(uint16_t *buf) @@ -45,7 +46,7 @@ ao_trng_send_cooked(uint16_t *buf) uint16_t t; uint32_t *rnd = (uint32_t *) ao_adc_ring; - t = ao_adc_get(AO_USB_IN_SIZE) >> 1; /* one 16-bit value per output byte */ + t = ao_adc_get(AO_USB_IN_SIZE) >> 1; /* two 16-bit values per two output bytes */ 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); @@ -73,15 +74,26 @@ ao_trng_send(void) usb_buf_id = 0; +#ifdef AO_TRNG_ENABLE_PORT + ao_gpio_set(AO_TRNG_ENABLE_PORT, AO_TRNG_ENABLE_BIT, AO_TRNG_ENABLE_PIN, 1); +#endif + trng_power_time = ao_time(); + ao_crc_reset(); for (;;) { if (!trng_running) { + AO_TICK_TYPE delay; + + delay = trng_power_time + AO_MS_TO_TICKS(100) - ao_time(); + if (delay > AO_MS_TO_TICKS(100)) + delay = AO_MS_TO_TICKS(100); + /* Delay long enough for the HV power supply * to stabilize so that the first bits we read * aren't of poor quality */ - ao_delay(AO_MS_TO_TICKS(10)); + ao_delay(delay); trng_running = TRUE; } if (ao_send_raw()) { @@ -118,6 +130,7 @@ static void ao_trng_resume(void *arg) #ifdef AO_TRNG_ENABLE_PORT ao_gpio_set(AO_TRNG_ENABLE_PORT, AO_TRNG_ENABLE_BIT, AO_TRNG_ENABLE_PIN, 1); #endif + trng_power_time = ao_time(); } static struct ao_power ao_trng_power = { @@ -131,7 +144,7 @@ void ao_trng_send_init(void) { #ifdef AO_TRNG_ENABLE_PORT - ao_enable_output(AO_TRNG_ENABLE_PORT, AO_TRNG_ENABLE_BIT, AO_TRNG_ENABLE_PIN, 1); + ao_enable_output(AO_TRNG_ENABLE_PORT, AO_TRNG_ENABLE_BIT, AO_TRNG_ENABLE_PIN, 0); ao_power_register(&ao_trng_power); #endif ao_enable_input(AO_RAW_PORT, AO_RAW_BIT, AO_EXTI_MODE_PULL_UP); |