mordae/pico-sdr
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This commit is contained in:
Jan Hamal Dvořák 2025-09-19 19:28:35 +02:00
parent 352fca398d
commit fc7b24977c
3 changed files with 116 additions and 63 deletions
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1
.gitignore vendored
View file

@ -1,2 +1,3 @@
/build/
/grc/*.py
/.cache/

92
grc/PicoSDR.grc
View file

@ -37,7 +37,7 @@ blocks:
id: variable
parameters:
comment: ''
value: '40_680_000'
value: 169.5e6
states:
bus_sink: false
bus_source: false
@ -49,24 +49,24 @@ blocks:
id: variable
parameters:
comment: ''
value: '4'
value: '16'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [352, 8.0]
coordinate: [368, 8.0]
rotation: 0
state: enabled
- name: rf_rate
id: variable
parameters:
comment: ''
value: '200_000'
value: '400_000'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [264, 8.0]
coordinate: [280, 8.0]
rotation: 0
state: enabled
- name: samp_rate
@ -78,7 +78,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [456, 8.0]
coordinate: [472, 8.0]
rotation: 0
state: enabled
- name: analog_agc_xx_0
@ -88,17 +88,17 @@ blocks:
alias: ''
comment: ''
gain: '1.0'
max_gain: '65536'
max_gain: '1'
maxoutbuf: '0'
minoutbuf: '0'
rate: 1e-4
reference: '0.7'
reference: '0.707'
type: complex
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [360, 312.0]
coordinate: [632, 312.0]
rotation: 0
state: enabled
- name: analog_quadrature_demod_cf_0
@ -114,9 +114,26 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [768, 616.0]
coordinate: [912, 616.0]
rotation: 0
state: true
- name: blocks_freqshift_cc_0
id: blocks_freqshift_cc
parameters:
affinity: ''
alias: ''
comment: ''
freq: '0'
maxoutbuf: '0'
minoutbuf: '0'
sample_rate: rf_rate
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [256, 328.0]
rotation: 0
state: enabled
- name: blocks_message_debug_0
id: blocks_message_debug
parameters:
@ -129,7 +146,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1056, 112.0]
coordinate: [1200, 112.0]
rotation: 0
state: true
- name: blocks_probe_rate_0
@ -149,7 +166,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [768, 120.0]
coordinate: [912, 120.0]
rotation: 0
state: true
- name: digital_costas_loop_cc_0
@ -162,12 +179,12 @@ blocks:
minoutbuf: '0'
order: '2'
use_snr: 'False'
w: 2 * math.pi / 100
w: math.pi / 100
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [768, 424.0]
coordinate: [912, 424.0]
rotation: 0
state: true
- name: low_pass_filter_0
@ -177,7 +194,7 @@ blocks:
alias: ''
beta: '6.76'
comment: ''
cutoff_freq: samp_rate / 8
cutoff_freq: samp_rate / 4
decim: decimation
gain: '1'
interp: '1'
@ -185,13 +202,13 @@ blocks:
minoutbuf: '0'
samp_rate: rf_rate
type: fir_filter_ccf
width: samp_rate / 8
width: samp_rate / 4
win: window.WIN_HAMMING
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [520, 284.0]
coordinate: [440, 284.0]
rotation: 0
state: enabled
- name: osmosdr_source_0
@ -548,7 +565,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [104, 244.0]
coordinate: [8, 244.0]
rotation: 0
state: enabled
- name: qtgui_const_sink_x_0
@ -640,7 +657,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1056, 408.0]
coordinate: [1200, 408.0]
rotation: 0
state: true
- name: qtgui_time_sink_x_0
@ -700,7 +717,7 @@ blocks:
nconnections: '1'
size: '256'
srate: samp_rate
stemplot: 'False'
stemplot: 'True'
style1: '1'
style10: '1'
style2: '1'
@ -737,7 +754,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [768, 312.0]
coordinate: [912, 312.0]
rotation: 0
state: true
- name: qtgui_time_sink_x_0_0
@ -797,7 +814,7 @@ blocks:
nconnections: '1'
size: '256'
srate: samp_rate
stemplot: 'False'
stemplot: 'True'
style1: '1'
style10: '1'
style2: '1'
@ -816,7 +833,7 @@ blocks:
tr_tag: '""'
type: float
update_time: 1/30
width1: '1'
width1: '2'
width10: '1'
width2: '1'
width3: '1'
@ -834,7 +851,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1056, 592.0]
coordinate: [1200, 592.0]
rotation: 0
state: true
- name: qtgui_time_sink_x_0_1
@ -894,7 +911,7 @@ blocks:
nconnections: '1'
size: '256'
srate: samp_rate
stemplot: 'False'
stemplot: 'True'
style1: '1'
style10: '1'
style2: '1'
@ -913,9 +930,9 @@ blocks:
tr_tag: '""'
type: complex
update_time: 1/30
width1: '1'
width1: '2'
width10: '1'
width2: '1'
width2: '2'
width3: '1'
width4: '1'
width5: '1'
@ -931,7 +948,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1056, 480.0]
coordinate: [1200, 480.0]
rotation: 0
state: true
- name: qtgui_waterfall_sink_x_0_0
@ -992,23 +1009,24 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [768, 208.0]
coordinate: [912, 208.0]
rotation: 0
state: true
connections:
- [analog_agc_xx_0, '0', low_pass_filter_0, '0']
- [analog_agc_xx_0, '0', analog_quadrature_demod_cf_0, '0']
- [analog_agc_xx_0, '0', blocks_probe_rate_0, '0']
- [analog_agc_xx_0, '0', digital_costas_loop_cc_0, '0']
- [analog_agc_xx_0, '0', qtgui_time_sink_x_0, '0']
- [analog_agc_xx_0, '0', qtgui_waterfall_sink_x_0_0, '0']
- [analog_quadrature_demod_cf_0, '0', qtgui_time_sink_x_0_0, '0']
- [blocks_freqshift_cc_0, '0', low_pass_filter_0, '0']
- [blocks_probe_rate_0, rate, blocks_message_debug_0, print]
- [digital_costas_loop_cc_0, '0', qtgui_const_sink_x_0, '0']
- [digital_costas_loop_cc_0, '0', qtgui_time_sink_x_0_1, '0']
- [low_pass_filter_0, '0', analog_quadrature_demod_cf_0, '0']
- [low_pass_filter_0, '0', blocks_probe_rate_0, '0']
- [low_pass_filter_0, '0', digital_costas_loop_cc_0, '0']
- [low_pass_filter_0, '0', qtgui_time_sink_x_0, '0']
- [low_pass_filter_0, '0', qtgui_waterfall_sink_x_0_0, '0']
- [osmosdr_source_0, '0', analog_agc_xx_0, '0']
- [low_pass_filter_0, '0', analog_agc_xx_0, '0']
- [osmosdr_source_0, '0', blocks_freqshift_cc_0, '0']
metadata:
file_format: 1
grc_version: 3.10.9.2
grc_version: 3.10.11.0

86
src/main.c
View file

@ -21,12 +21,13 @@
#include <limits.h>
#include <stdlib.h>
#define VREG_VOLTAGE VREG_VOLTAGE_1_20
#define CLK_SYS_HZ (320 * MHZ)
#define VREG_VOLTAGE VREG_VOLTAGE_1_30
#define CLK_SYS_HZ (300 * MHZ)
#define RX_PIN 10
#define FB_PIN 6
#define PSU_PIN 23
#define AMP_PIN 21
#define PIO pio0
#define SM_RX 0
@ -46,8 +47,8 @@
#define SIN_PHASE (0u)
#define COS_PHASE (3u << 30)
static uint32_t lo_cos[LO_WORDS] __attribute__((__aligned__(1 << LO_BITS_DEPTH)));
static uint32_t lo_sin[LO_WORDS] __attribute__((__aligned__(1 << LO_BITS_DEPTH)));
static uint32_t lo_cos[LO_WORDS] __aligned(1 << LO_BITS_DEPTH);
static uint32_t lo_sin[LO_WORDS] __aligned(1 << LO_BITS_DEPTH);
#define INIT_SAMPLE_RATE 100000
#define INIT_FREQ 94600000
@ -55,11 +56,9 @@ static uint32_t lo_sin[LO_WORDS] __attribute__((__aligned__(1 << LO_BITS_DEPTH))
static int frequency = INIT_FREQ;
static int sample_rate = INIT_SAMPLE_RATE;
#define BASE_GAIN (1 << 15)
#define ATTN_BITS 12
#define DECIMATE 4
static int gain = BASE_GAIN / (CLK_SYS_HZ / INIT_SAMPLE_RATE);
static int gain = 0x7fff / 750;
static queue_t iq_queue;
static uint8_t iq_queue_buffer[IQ_QUEUE_LEN][IQ_BLOCK_LEN];
@ -143,16 +142,8 @@ static void init_bias()
gpio_set_slew_rate(FB_PIN, GPIO_SLEW_RATE_SLOW);
const uint16_t insn[] = {
pio_encode_mov(pio_isr, pio_null),
pio_encode_in(pio_y, 4),
pio_encode_in(pio_pins, 1) | pio_encode_delay(15),
pio_encode_in(pio_pins, 1) | pio_encode_delay(15),
pio_encode_mov(pio_y, pio_isr),
pio_encode_mov(pio_x, pio_isr),
pio_encode_jmp_x_dec(6),
pio_encode_mov_not(pio_pins, pio_pins) | pio_encode_sideset(1, 1),
pio_encode_mov_not(pio_pins, pio_pins) | pio_encode_sideset(1, 1) |
pio_encode_delay(0),
};
pio_program_t prog = {
@ -249,9 +240,9 @@ static void lo_generate_phase(uint32_t *buf, size_t len, uint32_t step, uint32_t
static void rx_lo_init(double freq)
{
double frac = (double)CLK_SYS_HZ / (8 << LO_BITS_DEPTH);
freq = roundf(freq / frac) * frac;
uint32_t step = freq * 4294967296.0 / CLK_SYS_HZ;
double n = round(freq * (8 << LO_BITS_DEPTH) / CLK_SYS_HZ);
freq = n * CLK_SYS_HZ / (8 << LO_BITS_DEPTH);
uint32_t step = fmod(freq * 4294967296.0 / CLK_SYS_HZ, 4294967296.0);
lo_generate_phase(lo_cos, LO_WORDS, step, COS_PHASE);
lo_generate_phase(lo_sin, LO_WORDS, step, SIN_PHASE);
}
@ -516,6 +507,8 @@ inline static int getQ()
static void rf_rx(void)
{
int dcI = 0, dcQ = 0;
while (true) {
if (multicore_fifo_rvalid()) {
multicore_fifo_pop_blocking();
@ -532,13 +525,51 @@ static void rf_rx(void)
accQ();
}
int I = getI() * gain;
int Q = getQ() * gain;
// ~22-24b
int I = getI() << 12;
int Q = getQ() << 12;
dcI += (I - dcI) >> 12;
dcQ += (Q - dcQ) >> 12;
I -= dcI;
Q -= dcQ;
// ~10-12b
I >>= 12;
Q >>= 12;
// ~8b
I = (I * gain) >> 16;
Q = (Q * gain) >> 16;
int absI = abs(I);
int absQ = abs(Q);
if (absI >= 96 || absQ >= 96) {
gain--;
} else {
gain++;
}
if (I < -128)
I = -128;
if (I > 127)
I = 127;
if (Q < -128)
Q = -128;
if (Q > 127)
Q = 127;
if (gain < 1)
gain = 1;
else if (gain > 0xffff)
gain = 0xffff;
I >>= ATTN_BITS;
*blockptr++ = I + 128;
Q >>= ATTN_BITS;
*blockptr++ = Q + 128;
}
@ -560,7 +591,6 @@ static void run_command(uint8_t cmd, uint32_t arg)
} else if (0x02 == cmd) {
/* Set the rate at which IQ sample pairs are sent */
sample_rate = arg;
gain = BASE_GAIN / (CLK_SYS_HZ / sample_rate);
dma_timer_set_fraction(dma_t_samp, 1, CLK_SYS_HZ / (sample_rate * DECIMATE));
rx_lo_init(frequency);
}
@ -641,6 +671,10 @@ int main()
gpio_set_dir(PSU_PIN, GPIO_OUT);
gpio_put(PSU_PIN, 1);
gpio_init(AMP_PIN);
gpio_set_dir(AMP_PIN, GPIO_OUT);
gpio_put(AMP_PIN, 1);
gpio_init(PICO_DEFAULT_LED_PIN);
gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
gpio_put(PICO_DEFAULT_LED_PIN, 0);