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/*
* Copyright © 2014 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_adc_fast.h>
#include <ao_crc.h>
static void
ao_trng_fetch(void)
{
static uint16_t *buffer[2];
uint32_t kbytes = 1;
uint32_t count;
int usb_buf_id;
int i;
uint16_t *buf;
uint32_t *rnd;
if (!buffer[0]) {
buffer[0] = ao_usb_alloc();
buffer[1] = ao_usb_alloc();
if (!buffer[0])
return;
}
ao_cmd_decimal();
if (ao_cmd_status == ao_cmd_success)
kbytes = ao_cmd_lex_u32;
else
ao_cmd_status = ao_cmd_success;
usb_buf_id = 0;
count = kbytes * (1024/AO_USB_IN_SIZE);
ao_crc_reset();
ao_led_on(AO_LED_GREEN);
while (count--) {
buf = buffer[usb_buf_id];
// printf ("before get: head %3d tail %3d running %d\n", ao_adc_ring_head, ao_adc_ring_tail, ao_adc_running); flush();
rnd = (uint32_t *) ao_adc_get(AO_USB_IN_SIZE); /* one 16-bit value per output byte */
// printf ("after get: head %3d tail %3d running %d\n", ao_adc_ring_head, ao_adc_ring_tail, ao_adc_running); flush();
for (i = 0; i < 32; i++)
*buf++ = ao_crc_in_32_out_16(*rnd++);
ao_adc_ack(AO_USB_IN_SIZE);
// printf ("after ack: head %3d tail %3d running %d\n", ao_adc_ring_head, ao_adc_ring_tail, ao_adc_running); flush();
ao_led_toggle(AO_LED_GREEN|AO_LED_RED);
ao_usb_write(buffer[usb_buf_id], AO_USB_IN_SIZE);
ao_led_toggle(AO_LED_GREEN|AO_LED_RED);
usb_buf_id = 1-usb_buf_id;
}
ao_led_off(AO_LED_GREEN|AO_LED_RED);
flush();
}
static const struct ao_cmds usbtrng_cmds[] = {
{ ao_trng_fetch, "f <kbytes>\0Fetch a block of numbers" },
{ 0, NULL },
};
void main(void)
{
ao_led_init(LEDS_AVAILABLE);
ao_led_on(AO_LED_RED);
ao_clock_init();
ao_task_init();
ao_timer_init();
ao_dma_init();
ao_adc_init();
ao_crc_init();
ao_cmd_init();
ao_usb_init();
ao_cmd_register(usbtrng_cmds);
ao_led_off(AO_LED_RED);
ao_start_scheduler();
}
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