Rework for experimental SDR use
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f31bef5303
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404
src/main.c
404
src/main.c
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@ -17,6 +17,7 @@
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#include <pico/stdlib.h>
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#include <pico/stdio_usb.h>
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#include <pico/multicore.h>
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#include <pico/util/queue.h>
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#include <hardware/clocks.h>
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#include <hardware/dma.h>
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@ -35,17 +36,12 @@
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#include <stdlib.h>
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#define CLK_SYS_HZ (250 * MHZ)
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#define CLKDIV_RF 2
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#define CLK_RF_HZ ((unsigned)(CLK_SYS_HZ / CLKDIV_RF))
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#define EXTRA_BITS 8
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#define NUM_SAMPLES 128
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#define RSSI_ALPHA 1
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#define LPF_SAMPLES 4
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#define HPF_ALPHA 5
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#define SPEED 3
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#define SLEEP_US 16666
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#define LED_PIN 25
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#define LPF_SAMPLES 0 /* 4 */
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#define LO_BITS_DEPTH 13
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#define LO_WORDS (1 << LO_BITS_DEPTH)
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@ -53,25 +49,17 @@ static uint32_t lo_cos[LO_WORDS] __attribute__((__aligned__(LO_WORDS * 4)));
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static uint32_t lo_sin[LO_WORDS] __attribute__((__aligned__(LO_WORDS * 4)));
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static uint32_t rx_buf[LO_WORDS] __attribute__((__aligned__(LO_WORDS * 4)));
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#if SPEED < 3
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static int8_t mixer[256][128];
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#endif
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#define IQ_BLOCK_LEN 60
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static queue_t rx_queue;
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static int tx_dma = -1;
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static int rx_dma = -1;
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static volatile struct status {
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unsigned mtime;
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float rssi_raw;
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float rssi_max;
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unsigned sample_rate;
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int frequency;
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int angle;
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int I, Q;
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int gap;
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} status;
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#define PLEASE_DIE 0xd1e
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static void bias_init(int in_pin, int out_pin)
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{
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gpio_disable_pulls(in_pin);
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@ -101,6 +89,8 @@ static void bias_init(int in_pin, int out_pin)
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pio_sm_config pc = pio_get_default_sm_config();
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sm_config_set_in_pins(&pc, in_pin);
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sm_config_set_sideset(&pc, 2, false, true);
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sm_config_set_sideset_pins(&pc, out_pin);
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sm_config_set_out_pins(&pc, out_pin, 1);
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sm_config_set_set_pins(&pc, out_pin, 1);
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sm_config_set_wrap(&pc, 0, 0);
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@ -137,7 +127,7 @@ static void watch_init(int in_pin)
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pio_sm_config pc = pio_get_default_sm_config();
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sm_config_set_in_pins(&pc, in_pin);
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sm_config_set_wrap(&pc, 1, 1);
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sm_config_set_clkdiv_int_frac(&pc, 1, 0);
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sm_config_set_clkdiv_int_frac(&pc, CLKDIV_RF, 0);
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sm_config_set_fifo_join(&pc, PIO_FIFO_JOIN_RX);
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sm_config_set_in_shift(&pc, false, true, 32);
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pio_sm_init(pio1, 1, 1, &pc);
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@ -172,7 +162,7 @@ static void send_init(int out_pin)
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sm_config_set_out_pins(&pc, out_pin, 1);
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sm_config_set_set_pins(&pc, out_pin, 1);
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sm_config_set_wrap(&pc, 2, 2);
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sm_config_set_clkdiv_int_frac(&pc, 1, 0);
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sm_config_set_clkdiv_int_frac(&pc, CLKDIV_RF, 0);
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sm_config_set_fifo_join(&pc, PIO_FIFO_JOIN_TX);
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sm_config_set_out_shift(&pc, false, true, 32);
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pio_sm_init(pio1, 2, 2, &pc);
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@ -182,87 +172,12 @@ static void send_init(int out_pin)
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pio_sm_set_enabled(pio1, 2, true);
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}
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#if SPEED < 3
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inline static int lookup_mixer(uint8_t a, uint8_t b)
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{
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if (b & 0x80)
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return -mixer[a][(~b) & 0x7f];
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return mixer[a][b];
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}
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inline static void lpf(int8_t *xs, int len)
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{
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int p1, p2;
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p2 = p1 = xs[0];
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for (int i = 0; i < len; i++) {
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int tmp = xs[i];
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xs[i] = (p1 + p2 + tmp) / 3;
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p2 = p1, p1 = tmp;
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}
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p2 = p1 = xs[len - 1];
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for (int i = len - 1; i >= 0; i--) {
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int tmp = xs[i];
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xs[i] = (p1 + p2 + tmp) / 3;
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p2 = p1, p1 = tmp;
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}
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}
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static int8_t mix(uint8_t a, uint8_t b)
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{
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static int8_t ab[16], bb[16];
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for (int i = 0; i < 8; i++) {
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ab[i * 2 + 0] = (a >> 7) ? 127 : -127;
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ab[i * 2 + 1] = ab[i * 2];
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a <<= 1;
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bb[i * 2 + 0] = (b >> 7) ? 127 : -127;
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bb[i * 2 + 1] = bb[i * 2];
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b <<= 1;
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}
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lpf(ab, 16);
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lpf(bb, 16);
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for (int i = 0; i < 16; i++)
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ab[i] = ((int)ab[i] * (int)bb[i]) / 127;
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lpf(ab, 16);
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int accum = 0;
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#if SPEED == 1
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for (int i = 4; i < 12; i++)
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accum += ab[i];
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return accum >> 3;
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#else
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for (int i = 0; i < 16; i++)
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accum += ab[i];
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return accum >> 4;
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#endif
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}
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static void generate_mixer(void)
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{
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for (int i = 0; i < 256; i++)
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for (int j = 0; j < 128; j++)
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mixer[i][j] = mix(i, j);
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}
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#endif
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static float lo_freq_init(float req_freq)
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{
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const float step_hz = (float)CLK_SYS_HZ / (LO_WORDS * 32);
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const float step_hz = (float)CLK_RF_HZ / (LO_WORDS * 32);
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float freq = roundf(req_freq / step_hz) * step_hz;
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unsigned step = (float)UINT_MAX / (float)CLK_SYS_HZ * freq;
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unsigned step = (float)UINT_MAX / (float)CLK_RF_HZ * freq;
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interp0->ctrl[0] = (31 << SIO_INTERP0_CTRL_LANE0_MASK_MSB_LSB) |
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(0 << SIO_INTERP0_CTRL_LANE0_MASK_LSB_LSB) |
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@ -331,39 +246,25 @@ inline static __unused int cheap_angle_diff(int angle1, int angle2)
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return diff;
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}
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inline static __unused unsigned popcount(unsigned v)
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inline static unsigned popcount(unsigned v)
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{
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v = v - ((v >> 1) & 0x55555555);
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v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
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return (((v + (v >> 4)) & 0x0f0f0f0f) * 0x01010101) >> 24;
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}
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static __unused bool is_prime_or_one(int n)
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__noinline static int mix(uint32_t *buf, uint32_t *lo, int len)
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{
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if (n == 1 || n == 2 || n == 3)
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return true;
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int x = 0;
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if (n <= 1 || n % 2 == 0 || n % 3 == 0)
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return false;
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for (int k = 0; k < len; k++)
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x += popcount(buf[k] ^ lo[k]);
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for (int i = 5; i * i <= n; i += 6) {
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if (n % i == 0 || n % (i + 2) == 0)
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return false;
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}
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return true;
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return x;
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}
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static void rf_rx(void)
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{
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uint64_t assi0 = 0, assi1 = 0, assi2 = 0;
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status.rssi_max = 0.5f * powf(127.5f * (1 << EXTRA_BITS), 2.0f);
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#if HPF_ALPHA
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int64_t hpI = 0, hpQ = 0;
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#endif
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#if LPF_SAMPLES
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static int lpIh1[LPF_SAMPLES], lpQh1[LPF_SAMPLES];
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int lpIavg1 = 0, lpQavg1 = 0;
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@ -382,181 +283,51 @@ static void rf_rx(void)
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}
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#endif
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#if SPEED == 2
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interp0->ctrl[0] = (31 << SIO_INTERP0_CTRL_LANE0_MASK_MSB_LSB) |
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(0 << SIO_INTERP0_CTRL_LANE0_MASK_LSB_LSB) |
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(8 << SIO_INTERP0_CTRL_LANE0_SHIFT_LSB);
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interp0->ctrl[1] = SIO_INTERP0_CTRL_LANE0_CROSS_RESULT_BITS |
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(7 << SIO_INTERP0_CTRL_LANE1_MASK_MSB_LSB) |
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(0 << SIO_INTERP0_CTRL_LANE1_MASK_LSB_LSB) |
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(0 << SIO_INTERP0_CTRL_LANE1_SHIFT_LSB);
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#endif
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#if SPEED == 1
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interp0->ctrl[0] = (31 << SIO_INTERP0_CTRL_LANE0_MASK_MSB_LSB) |
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(0 << SIO_INTERP0_CTRL_LANE0_MASK_LSB_LSB) |
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(4 << SIO_INTERP0_CTRL_LANE0_SHIFT_LSB);
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interp0->ctrl[1] = SIO_INTERP0_CTRL_LANE0_CROSS_RESULT_BITS |
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(7 << SIO_INTERP0_CTRL_LANE1_MASK_MSB_LSB) |
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(0 << SIO_INTERP0_CTRL_LANE1_MASK_LSB_LSB) |
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(0 << SIO_INTERP0_CTRL_LANE1_SHIFT_LSB);
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#endif
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#if SPEED < 3
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interp1->ctrl[0] = interp0->ctrl[0];
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interp1->ctrl[1] = interp0->ctrl[1];
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#endif
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int prevI = 0, prevQ = 0;
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int period = 0;
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int frequency = 0;
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int stride = 0;
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int delta_avg = 1;
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int prev_delta_netto = 0;
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unsigned prev_transfers = 0;
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int prev_angle = 0;
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int last_angle_delta = 0;
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int angle_stride = 0;
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int rotation = 0;
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static int16_t block[IQ_BLOCK_LEN];
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int block_ptr = 0;
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while (true) {
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uint32_t msg = 0;
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if (multicore_fifo_rvalid()) {
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msg = multicore_fifo_pop_blocking();
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if (PLEASE_DIE == msg) {
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multicore_fifo_push_blocking(0);
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return;
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}
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}
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int I = 0, Q = 0;
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if (!dma_channel_is_busy(rx_dma))
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dma_channel_start(rx_dma);
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int delta = ~dma_hw->ch[rx_dma].transfer_count - prev_transfers;
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delta_avg = (delta_avg * 1023 + delta * 256) / 1024;
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int delta_netto = delta_avg / 256;
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if (delta_netto == (prev_delta_netto - 1)) {
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delta_netto = prev_delta_netto;
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} else {
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prev_delta_netto = delta_netto;
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}
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while (delta < delta_netto) {
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if (!dma_channel_is_busy(rx_dma))
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dma_channel_start(rx_dma);
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int gap = NUM_SAMPLES - delta;
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while (delta < NUM_SAMPLES)
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delta = ~dma_hw->ch[rx_dma].transfer_count - prev_transfers;
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}
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prev_transfers += delta_netto;
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unsigned pos = (prev_transfers - NUM_SAMPLES - 2) & (LO_WORDS - 1);
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if (gap < 0)
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prev_transfers += NUM_SAMPLES;
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#if SPEED == 1
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unsigned prev_rx_word = 0;
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unsigned prev_cos_word = 0;
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unsigned prev_sin_word = 0;
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#endif
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unsigned pos = prev_transfers & (LO_WORDS - 1);
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prev_transfers += NUM_SAMPLES;
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for (int k = 0; k < NUM_SAMPLES; k++) {
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unsigned rx_word = rx_buf[pos];
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unsigned cos_word = lo_cos[pos];
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unsigned sin_word = lo_sin[pos];
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int I = mix(rx_buf + pos, lo_cos + pos, NUM_SAMPLES);
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int Q = mix(rx_buf + pos, lo_sin + pos, NUM_SAMPLES);
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pos = (pos + 1) & (LO_WORDS - 1);
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#if SPEED == 3
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I += popcount(rx_word ^ cos_word);
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Q += popcount(rx_word ^ sin_word);
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#elif SPEED == 2
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interp0->accum[0] = rx_word;
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interp0->accum[1] = rx_word;
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interp1->accum[0] = cos_word;
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interp1->accum[1] = cos_word;
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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interp0->accum[0] = rx_word;
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interp0->accum[1] = rx_word;
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interp1->accum[0] = sin_word;
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interp1->accum[1] = sin_word;
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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#elif SPEED == 1
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I += lookup_mixer(((prev_rx_word << 4) | (rx_word >> 28)),
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((prev_cos_word << 4) | (cos_word >> 28)));
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Q += lookup_mixer(((prev_rx_word << 4) | (rx_word >> 28)),
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((prev_sin_word << 4) | (sin_word >> 28)));
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interp0->accum[0] = rx_word;
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interp0->accum[1] = rx_word;
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interp1->accum[0] = cos_word;
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interp1->accum[1] = cos_word;
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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I += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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prev_cos_word = interp1->pop[1];
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interp0->accum[0] = rx_word;
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interp0->accum[1] = rx_word;
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interp1->accum[0] = sin_word;
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interp1->accum[1] = sin_word;
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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Q += lookup_mixer(interp0->pop[1], interp1->pop[1]);
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prev_sin_word = interp1->pop[1];
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prev_rx_word = interp0->pop[1];
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#endif
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}
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/*
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* Limit our biasing activity to a short period at a time.
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* This is sufficient to keep the input biased while limiting
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* the interference from biasing to minimum.
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*/
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pio_sm_exec(pio1, 0, pio_encode_sideset(2, 3) | pio_encode_nop());
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/* Remove the large DC bias. */
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I -= 16 * NUM_SAMPLES;
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Q -= 16 * NUM_SAMPLES;
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#if SPEED == 3
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/* Not sure why, but this removes a small DC bias. */
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I -= NUM_SAMPLES / 16;
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Q -= NUM_SAMPLES / 16;
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/* Normalize to given number of bits. */
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I = (I * ((1 << (7 + EXTRA_BITS)) - 1)) / 16;
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Q = (Q * ((1 << (7 + EXTRA_BITS)) - 1)) / 16;
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#else
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I <<= EXTRA_BITS;
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Q <<= EXTRA_BITS;
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#endif
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I /= NUM_SAMPLES;
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Q /= NUM_SAMPLES;
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#if HPF_ALPHA
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int64_t tmpI = (int64_t)I << 16;
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I -= hpI >> 16;
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hpI = (hpI * ((1 << 16) - HPF_ALPHA) + tmpI * HPF_ALPHA) >> 16;
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int64_t tmpQ = (int64_t)Q << 16;
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Q -= hpQ >> 16;
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hpQ = (hpQ * ((1 << 16) - HPF_ALPHA) + tmpQ * HPF_ALPHA) >> 16;
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#endif
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/* Pause biasing. */
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pio_sm_exec(pio1, 0, pio_encode_sideset(2, 2) | pio_encode_nop());
|
||||
|
||||
#if LPF_SAMPLES
|
||||
lpIavg1 += I - lpIh1[lpIidx];
|
||||
|
|
@ -588,49 +359,16 @@ static void rf_rx(void)
|
|||
Q = lpQavg3 / (LPF_SAMPLES * LPF_SAMPLES * LPF_SAMPLES);
|
||||
#endif
|
||||
|
||||
if ((Q < 0) ^ (prevQ < 0)) {
|
||||
stride *= ((I < 0) ^ (Q < 0)) ? 1 : -1;
|
||||
period = (63 * period + stride) / 64;
|
||||
frequency = CLK_SYS_HZ / ((period >> 3) * delta_netto);
|
||||
stride = 0;
|
||||
} else if ((I < 0) ^ (prevI < 0)) {
|
||||
stride *= ((I < 0) ^ (Q < 0)) ? -1 : 1;
|
||||
period = (63 * period + stride) / 64;
|
||||
frequency = CLK_SYS_HZ / ((period >> 3) * delta_netto);
|
||||
stride = 0;
|
||||
} else {
|
||||
stride += 1024;
|
||||
status.sample_rate = CLK_RF_HZ / (NUM_SAMPLES * 32);
|
||||
status.gap = gap;
|
||||
|
||||
block[block_ptr++] = I;
|
||||
block[block_ptr++] = Q;
|
||||
|
||||
if (block_ptr >= IQ_BLOCK_LEN) {
|
||||
queue_try_add(&rx_queue, block);
|
||||
block_ptr = 0;
|
||||
}
|
||||
|
||||
prevI = I;
|
||||
prevQ = Q;
|
||||
|
||||
int angle = cheap_atan2(I, Q);
|
||||
int angle_delta = cheap_angle_diff(angle, prev_angle);
|
||||
prev_angle = angle;
|
||||
|
||||
if (angle_delta) {
|
||||
rotation = (rotation * 31 + ((last_angle_delta / angle_stride) >> 16)) / 32;
|
||||
last_angle_delta = angle_delta;
|
||||
angle_stride = 1;
|
||||
} else {
|
||||
angle_stride++;
|
||||
}
|
||||
|
||||
uint64_t ssi = (uint64_t)I * (uint64_t)I + (uint64_t)Q * (uint64_t)Q;
|
||||
const uint64_t alpha = RSSI_ALPHA;
|
||||
|
||||
assi0 = (assi0 * (256 - alpha) + (ssi << 16) * alpha) / 256;
|
||||
assi1 = (assi1 * (256 - alpha) + assi0 * alpha) / 256;
|
||||
assi2 = (assi2 * (256 - alpha) + assi1 * alpha) / 256;
|
||||
|
||||
status.rssi_raw = assi2 >> 16;
|
||||
status.frequency = frequency;
|
||||
status.sample_rate = CLK_SYS_HZ / (delta_netto * 32);
|
||||
status.angle = rotation << 16;
|
||||
status.I = I;
|
||||
status.Q = Q;
|
||||
status.mtime = time_us_32();
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -727,14 +465,10 @@ static void command(const char *cmd)
|
|||
multicore_launch_core1(rf_rx);
|
||||
sleep_us(100);
|
||||
|
||||
unsigned last = 0;
|
||||
|
||||
while (true) {
|
||||
int c = getchar_timeout_us(0);
|
||||
|
||||
if (13 == c) {
|
||||
multicore_fifo_push_blocking(PLEASE_DIE);
|
||||
multicore_fifo_pop_blocking();
|
||||
multicore_reset_core1();
|
||||
dma_channel_abort(rx_dma);
|
||||
dma_channel_cleanup(rx_dma);
|
||||
|
|
@ -742,27 +476,18 @@ static void command(const char *cmd)
|
|||
break;
|
||||
}
|
||||
|
||||
static struct status st;
|
||||
st = status;
|
||||
static int16_t block[IQ_BLOCK_LEN];
|
||||
|
||||
if (st.mtime == last)
|
||||
continue;
|
||||
while (queue_try_remove(&rx_queue, block)) {
|
||||
putchar('!');
|
||||
|
||||
last = st.mtime;
|
||||
for (int i = 0; i < IQ_BLOCK_LEN; i++)
|
||||
printf("%04hx", block[i]);
|
||||
|
||||
float rssi_rel = st.rssi_raw / st.rssi_max;
|
||||
putchar('\n');
|
||||
}
|
||||
|
||||
printf("%5.1f dBm (%5.0f) [%5u %+7i] %+5.1f ", 10.0f * log10f(rssi_rel),
|
||||
sqrtf(st.rssi_raw), st.sample_rate,
|
||||
(abs(st.frequency) > (int)(st.sample_rate / 2)) ? 0 : st.frequency,
|
||||
180.0f * st.angle / (float)INT_MAX);
|
||||
|
||||
plot_IQ(st.I, st.Q);
|
||||
puts("");
|
||||
|
||||
#if SLEEP_US
|
||||
sleep_us(SLEEP_US);
|
||||
#endif
|
||||
printf("gap=%i, sr=%i\n", status.gap, status.sample_rate);
|
||||
}
|
||||
|
||||
return;
|
||||
|
|
@ -803,7 +528,7 @@ static void command(const char *cmd)
|
|||
|
||||
send_init(n);
|
||||
|
||||
const float step_hz = (float)CLK_SYS_HZ / (LO_WORDS * 32);
|
||||
const float step_hz = (float)CLK_RF_HZ / (LO_WORDS * 32);
|
||||
const float start = roundf(f / step_hz) * step_hz;
|
||||
const float stop = roundf(g / step_hz) * step_hz;
|
||||
|
||||
|
|
@ -884,14 +609,11 @@ int main()
|
|||
tx_dma = dma_claim_unused_channel(true);
|
||||
rx_dma = dma_claim_unused_channel(true);
|
||||
|
||||
queue_init(&rx_queue, IQ_BLOCK_LEN * 2, 64);
|
||||
|
||||
printf("\nPuppet Online!\n");
|
||||
printf("clk_sys = %10.6f MHz\n", (float)clock_get_hz(clk_sys) / MHZ);
|
||||
|
||||
#if SPEED < 3
|
||||
printf("Generating mixer lookup table...\n");
|
||||
generate_mixer();
|
||||
#endif
|
||||
|
||||
static char cmd[83];
|
||||
int cmdlen = 0;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue