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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>
#define AO_TRNG_SPI_BUS 1
static uint32_t spi_speed = AO_SPI_SPEED_4MHz;
#define AO_TRNG_SPI_BUF 1024
#if 0
static uint8_t *spi_buf;
static uint8_t *spi_head, *spi_tail;
static uint8_t spi_wakeup;
static void
ao_trng_run(void)
{
int this_time;
uint8_t *end;
if (!spi_buf)
spi_buf = ao_usb_alloc(AO_TRNG_SPI_BUF);
flush();
ao_spi_get(AO_TRNG_SPI_BUS, spi_speed);
spi_tail = spi_buf;
spi_head = spi_buf;
ao_spi_recv_ring_start(spi_buf, AO_TRNG_SPI_BUF, &spi_head, &spi_tail, &spi_wakeup, AO_TRNG_SPI_BUS);
while (!ao_usb_out_avail) {
ao_arch_block_interrupts();
while (spi_head == spi_tail) {
spi_wakeup = 0;
ao_sleep(&spi_wakeup);
}
ao_arch_release_interrupts();
if (spi_tail > spi_head)
end = spi_buf + AO_TRNG_SPI_BUF;
else
end = spi_head;
this_time = end - spi_tail;
if (this_time > 64)
this_time = 64;
ao_usb_write(spi_tail, this_time);
spi_tail += this_time;
if (spi_tail == spi_buf + AO_TRNG_SPI_BUF)
spi_tail = spi_buf;
}
ao_spi_put(AO_TRNG_SPI_BUS);
getchar();
}
static void
ao_trng_test(void)
{
static uint8_t random[32];
uint8_t i;
ao_spi_get(AO_TRNG_SPI_BUS, spi_speed);
ao_spi_recv(random, sizeof (random), AO_TRNG_SPI_BUS);
ao_spi_put(AO_TRNG_SPI_BUS);
for (i = 0; i < sizeof (random); i++)
printf (" %02x", random[i]);
printf ("\n");
}
#endif
#define ADC_RING_SIZE 512
static uint8_t *adc_ring;
static uint16_t adc_head, adc_tail;
static uint16_t adc_wake;
void lpc_adc_isr(void)
{
uint16_t avail;
uint16_t this, next;
this = adc_head;
next = (this + 1) & (ADC_RING_SIZE - 1);
if (next == adc_tail) {
lpc_adc.inten = 0;
return;
}
adc_ring[this] = lpc_adc.dr[6] >> 8;
adc_head = next;
/* If there are enough entries, wake up any waiters
*/
avail = (next - adc_tail) & (ADC_RING_SIZE - 1);
if (avail >= adc_wake) {
adc_wake = 0;
ao_wakeup(&adc_wake);
}
}
#define AO_ADC_CLKDIV (AO_LPC_SYSCLK / 450000)
static void
ao_trng_adc_init(void)
{
adc_ring = ao_usb_alloc(ADC_RING_SIZE);
lpc_scb.sysahbclkctrl |= (1 << LPC_SCB_SYSAHBCLKCTRL_ADC);
lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_ADC_PD);
/* Enable interrupt when AO_ADC_6 is complete */
lpc_adc.inten = 0;
lpc_nvic_set_enable(LPC_ISR_ADC_POS);
lpc_nvic_set_priority(LPC_ISR_ADC_POS, AO_LPC_NVIC_CLOCK_PRIORITY);
#if AO_ADC_0
ao_enable_analog(0, 11, 0);
#endif
#if AO_ADC_1
ao_enable_analog(0, 12, 1);
#endif
#if AO_ADC_2
ao_enable_analog(0, 13, 2);
#endif
#if AO_ADC_3
ao_enable_analog(0, 14, 3);
#endif
#if AO_ADC_4
ao_enable_analog(0, 15, 4);
#endif
#if AO_ADC_5
ao_enable_analog(0, 16, 5);
#endif
#if AO_ADC_6
ao_enable_analog(0, 22, 6);
#endif
#if AO_ADC_7
ao_enable_analog(0, 23, 7);
#endif
lpc_adc.cr = ((1 << (LPC_ADC_CR_SEL + 6)) |
(AO_ADC_CLKDIV << LPC_ADC_CR_CLKDIV) |
(1 << LPC_ADC_CR_BURST) |
(LPC_ADC_CR_CLKS_9 << LPC_ADC_CR_CLKS));
}
static void
ao_trng_adc_dump(void)
{
int i;
while (((adc_head - adc_tail) & (ADC_RING_SIZE - 1)) < 16) {
lpc_adc.inten = (1 << (LPC_ADC_INTEN_ADINTEN + 6));
adc_wake = 16;
ao_sleep(&adc_wake);
}
printf("adc_head %d tail %d\n", adc_head, adc_tail);
for (i = 0; i < 16; i++) {
printf(" %4d", adc_ring[adc_tail]);
adc_tail = (adc_tail + 1) & (ADC_RING_SIZE - 1);
}
printf("\n");
lpc_adc.inten = 0;
}
static void
ao_trng_run(void)
{
uint16_t this_time;
flush();
while (!ao_usb_out_avail) {
ao_arch_block_interrupts();
while (((adc_head - adc_tail) & (ADC_RING_SIZE - 1)) < 64) {
lpc_adc.inten = (1 << (LPC_ADC_INTEN_ADINTEN + 6));
adc_wake = 64;
ao_sleep(&adc_wake);
}
ao_arch_release_interrupts();
this_time = ADC_RING_SIZE - adc_tail;
if (this_time > 64)
this_time = 64;
ao_usb_write(&adc_ring[adc_tail], this_time);
adc_tail = (adc_tail + this_time) & (ADC_RING_SIZE - 1);
}
lpc_adc.inten = 0;
}
static void
ao_trng_speed(void)
{
ao_cmd_decimal();
if (ao_cmd_lex_u32 == 0 || ao_cmd_status != ao_cmd_success) {
ao_cmd_status = ao_cmd_success;
printf ("Current spi speed %d\n", spi_speed);
} else {
spi_speed = ao_cmd_lex_u32;
}
}
static const struct ao_cmds ao_trng_cmds[] = {
// { ao_trng_test, "R\0Dump some random numbers" },
{ ao_trng_run, "s\0Send random bits until char" },
{ ao_trng_speed, "S <speed>\0Set SPI speed (48MHz/speed)" },
{ ao_trng_adc_dump, "a\0Dump ADC data" },
{ 0, NULL }
};
void
main(void)
{
ao_clock_init();
ao_task_init();
ao_timer_init();
// ao_spi_init();
ao_usb_init();
ao_trng_adc_init();
ao_serial_init();
ao_led_init(LEDS_AVAILABLE);
ao_cmd_init();
ao_cmd_register(ao_trng_cmds);
ao_start_scheduler();
}
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