#include <ao.h>
#define AO_TRNG_SPI_BUS 1
-#define AO_TRNG_SPI_SPEED AO_SPI_SPEED_250kHz
+
+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, AO_TRNG_SPI_SPEED);
+ 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_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 }
};
ao_task_init();
ao_timer_init();
- ao_spi_init();
+// ao_spi_init();
ao_usb_init();
+ ao_trng_adc_init();
+
ao_serial_init();
ao_led_init(LEDS_AVAILABLE);
- ao_led_on(AO_LED_GREEN);
-
ao_cmd_init();
ao_cmd_register(ao_trng_cmds);
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