#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)
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);
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()) {
#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 = {
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);