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Go to 300 MHz for FM receiver

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This commit is contained in:
Jan Hamal Dvořák 2024-03-06 00:01:57 +01:00
parent 4b6194e9c2
commit 2995f19e9b
2 changed files with 145 additions and 226 deletions
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348
grc/PicoSDR-WBFM.grc
View file

@ -77,7 +77,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [712, 480.0]
coordinate: [704, 296.0]
rotation: 0
state: true
- name: analog_wfm_rcv_pll_0
@ -85,7 +85,7 @@ blocks:
parameters:
affinity: ''
alias: ''
audio_decimation: '4'
audio_decimation: '1'
comment: ''
deemph_tau: 75e-6
maxoutbuf: '0'
@ -95,7 +95,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [704, 552.0]
coordinate: [456, 408.0]
rotation: 0
state: true
- name: audio_sink_0
@ -112,7 +112,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1000, 560.0]
coordinate: [992, 384.0]
rotation: 0
state: true
- name: blocks_add_xx_0
@ -130,7 +130,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1000, 632.0]
coordinate: [992, 456.0]
rotation: 0
state: true
- name: blocks_interleaved_short_to_complex_0
@ -184,24 +184,6 @@ blocks:
coordinate: [704, 16.0]
rotation: 0
state: true
- name: digital_costas_loop_cc_0
id: digital_costas_loop_cc
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
order: '2'
use_snr: 'False'
w: 2 * math.pi / 100
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [704, 296.0]
rotation: 0
state: true
- name: import_0
id: import
parameters:
@ -215,6 +197,54 @@ blocks:
coordinate: [440, 8.0]
rotation: 0
state: true
- name: low_pass_filter_0
id: low_pass_filter
parameters:
affinity: ''
alias: ''
beta: '6.76'
comment: ''
cutoff_freq: '22_000'
decim: '4'
gain: '1'
interp: '1'
maxoutbuf: '0'
minoutbuf: '0'
samp_rate: samp_rate
type: fir_filter_fff
width: '2_000'
win: window.WIN_HAMMING
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [704, 356.0]
rotation: 0
state: true
- name: low_pass_filter_0_0
id: low_pass_filter
parameters:
affinity: ''
alias: ''
beta: '6.76'
comment: ''
cutoff_freq: '22_000'
decim: '4'
gain: '1'
interp: '1'
maxoutbuf: '0'
minoutbuf: '0'
samp_rate: samp_rate
type: fir_filter_fff
width: '2_000'
win: window.WIN_HAMMING
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [704, 516.0]
rotation: 0
state: true
- name: network_tcp_source_0
id: network_tcp_source
parameters:
@ -235,98 +265,6 @@ blocks:
coordinate: [48, 200.0]
rotation: 0
state: true
- name: qtgui_const_sink_x_0
id: qtgui_const_sink_x
parameters:
affinity: ''
alias: ''
alpha1: '1.0'
alpha10: '1.0'
alpha2: '1.0'
alpha3: '1.0'
alpha4: '1.0'
alpha5: '1.0'
alpha6: '1.0'
alpha7: '1.0'
alpha8: '1.0'
alpha9: '1.0'
autoscale: 'False'
axislabels: 'True'
color1: '"blue"'
color10: '"red"'
color2: '"red"'
color3: '"red"'
color4: '"red"'
color5: '"red"'
color6: '"red"'
color7: '"red"'
color8: '"red"'
color9: '"red"'
comment: ''
grid: 'True'
gui_hint: (2, 1, 1, 1)
label1: ''
label10: ''
label2: ''
label3: ''
label4: ''
label5: ''
label6: ''
label7: ''
label8: ''
label9: ''
legend: 'False'
marker1: '0'
marker10: '0'
marker2: '0'
marker3: '0'
marker4: '0'
marker5: '0'
marker6: '0'
marker7: '0'
marker8: '0'
marker9: '0'
name: '""'
nconnections: '1'
size: min(int(samp_rate // 30), 512)
style1: '0'
style10: '0'
style2: '0'
style3: '0'
style4: '0'
style5: '0'
style6: '0'
style7: '0'
style8: '0'
style9: '0'
tr_chan: '0'
tr_level: '0.0'
tr_mode: qtgui.TRIG_MODE_FREE
tr_slope: qtgui.TRIG_SLOPE_POS
tr_tag: '""'
type: complex
update_time: 1/30
width1: '1'
width10: '1'
width2: '1'
width3: '1'
width4: '1'
width5: '1'
width6: '1'
width7: '1'
width8: '1'
width9: '1'
xmax: '1'
xmin: '-1'
ymax: '1'
ymin: '-1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1000, 280.0]
rotation: 0
state: true
- name: qtgui_time_sink_x_0
id: qtgui_time_sink_x
parameters:
@ -518,104 +456,7 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1000, 456.0]
rotation: 0
state: true
- name: qtgui_time_sink_x_0_1
id: qtgui_time_sink_x
parameters:
affinity: ''
alias: ''
alpha1: '1.0'
alpha10: '1.0'
alpha2: '1.0'
alpha3: '1.0'
alpha4: '1.0'
alpha5: '1.0'
alpha6: '1.0'
alpha7: '1.0'
alpha8: '1.0'
alpha9: '1.0'
autoscale: 'False'
axislabels: 'True'
color1: blue
color10: dark blue
color2: red
color3: green
color4: black
color5: cyan
color6: magenta
color7: yellow
color8: dark red
color9: dark green
comment: ''
ctrlpanel: 'False'
entags: 'False'
grid: 'True'
gui_hint: (2, 0, 1, 1)
label1: I
label10: Signal 10
label2: Q
label3: Signal 3
label4: Signal 4
label5: Signal 5
label6: Signal 6
label7: Signal 7
label8: Signal 8
label9: Signal 9
legend: 'False'
marker1: '-1'
marker10: '-1'
marker2: '-1'
marker3: '-1'
marker4: '-1'
marker5: '-1'
marker6: '-1'
marker7: '-1'
marker8: '-1'
marker9: '-1'
name: '"IQ / Loop"'
nconnections: '1'
size: min(int(samp_rate // 30), 512)
srate: samp_rate
stemplot: 'False'
style1: '1'
style10: '1'
style2: '1'
style3: '1'
style4: '1'
style5: '1'
style6: '1'
style7: '1'
style8: '1'
style9: '1'
tr_chan: '0'
tr_delay: '0'
tr_level: '0.0'
tr_mode: qtgui.TRIG_MODE_FREE
tr_slope: qtgui.TRIG_SLOPE_POS
tr_tag: '""'
type: complex
update_time: 1/30
width1: '1'
width10: '1'
width2: '1'
width3: '1'
width4: '1'
width5: '1'
width6: '1'
width7: '1'
width8: '1'
width9: '1'
ylabel: Amplitude
ymax: '1'
ymin: '-1'
yunit: '""'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1000, 352.0]
coordinate: [992, 272.0]
rotation: 0
state: true
- name: qtgui_waterfall_sink_x_0_0
@ -711,9 +552,9 @@ blocks:
fftsize: '1024'
freqhalf: 'True'
grid: 'True'
gui_hint: (3, 0, 1, 2)
gui_hint: (4, 0, 1, 2)
int_max: '0'
int_min: '-90'
int_min: 10 * math.log10(1 / ((2 ** 15 - 1) ** 2))
label1: ''
label10: ''
label2: ''
@ -737,26 +578,87 @@ blocks:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1144, 616.0]
coordinate: [1152, 440.0]
rotation: 0
state: true
- name: qtgui_waterfall_sink_x_0_0_0_0
id: qtgui_waterfall_sink_x
parameters:
affinity: ''
alias: ''
alpha1: '1.0'
alpha10: '1.0'
alpha2: '1.0'
alpha3: '1.0'
alpha4: '1.0'
alpha5: '1.0'
alpha6: '1.0'
alpha7: '1.0'
alpha8: '1.0'
alpha9: '1.0'
axislabels: 'True'
bw: samp_rate
color1: '0'
color10: '0'
color2: '0'
color3: '0'
color4: '0'
color5: '0'
color6: '0'
color7: '0'
color8: '0'
color9: '0'
comment: ''
fc: '0'
fftsize: '1024'
freqhalf: 'True'
grid: 'True'
gui_hint: (3, 0, 1, 2)
int_max: '0'
int_min: 10 * math.log10(1 / ((2 ** 15 - 1) ** 2))
label1: ''
label10: ''
label2: ''
label3: ''
label4: ''
label5: ''
label6: ''
label7: ''
label8: ''
label9: ''
legend: 'True'
maxoutbuf: '0'
minoutbuf: '0'
name: '"FM Demodulation"'
nconnections: '1'
showports: 'False'
type: float
update_time: 1/30
wintype: window.WIN_BLACKMAN_hARRIS
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [992, 168.0]
rotation: 0
state: true
connections:
- [analog_quadrature_demod_cf_0, '0', qtgui_time_sink_x_0_0, '0']
- [analog_wfm_rcv_pll_0, '0', audio_sink_0, '0']
- [analog_wfm_rcv_pll_0, '0', blocks_add_xx_0, '0']
- [analog_wfm_rcv_pll_0, '1', audio_sink_0, '1']
- [analog_wfm_rcv_pll_0, '1', blocks_add_xx_0, '1']
- [analog_quadrature_demod_cf_0, '0', qtgui_waterfall_sink_x_0_0_0_0, '0']
- [analog_wfm_rcv_pll_0, '0', low_pass_filter_0, '0']
- [analog_wfm_rcv_pll_0, '1', low_pass_filter_0_0, '0']
- [blocks_add_xx_0, '0', qtgui_waterfall_sink_x_0_0_0, '0']
- [blocks_interleaved_short_to_complex_0, '0', analog_quadrature_demod_cf_0, '0']
- [blocks_interleaved_short_to_complex_0, '0', analog_wfm_rcv_pll_0, '0']
- [blocks_interleaved_short_to_complex_0, '0', blocks_probe_rate_0, '0']
- [blocks_interleaved_short_to_complex_0, '0', digital_costas_loop_cc_0, '0']
- [blocks_interleaved_short_to_complex_0, '0', qtgui_time_sink_x_0, '0']
- [blocks_interleaved_short_to_complex_0, '0', qtgui_waterfall_sink_x_0_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', audio_sink_0, '0']
- [low_pass_filter_0, '0', blocks_add_xx_0, '0']
- [low_pass_filter_0_0, '0', audio_sink_0, '1']
- [low_pass_filter_0_0, '0', blocks_add_xx_0, '1']
- [network_tcp_source_0, '0', blocks_interleaved_short_to_complex_0, '0']
metadata:

23
src/main.c
View file

@ -40,10 +40,10 @@
/* FM Radio */
#if 1
#define VREG_VOLTAGE VREG_VOLTAGE_1_20
#define CLK_SYS_HZ (266 * MHZ)
#define CLK_SYS_HZ (300 * MHZ)
#define BANDWIDTH 1536000
#define DECIMATION_BITS 3
#define LPF_ORDER 3
#define LPF_ORDER 4
#define AGC_DECAY_BITS 20
#define BIAS_STRENGTH 0
#endif
@ -64,7 +64,7 @@
#define DECIMATION (1 << DECIMATION_BITS)
static_assert(RX_SLEEP_US > 0, "RX_SLEEP_US must be positive");
static_assert(LPF_ORDER <= 3, "LPF_ORDER must be 0-3");
static_assert(LPF_ORDER <= 4, "LPF_ORDER must be 0-4");
static_assert(BIAS_STRENGTH >= 0 && BIAS_STRENGTH <= 9, "BIAS_STRENGTH must be 0-9");
#define XOR_ADDR 0x1000
@ -636,6 +636,13 @@ static void rf_rx(void)
int lpQa3 = 0;
#endif
#if LPF_ORDER >= 4
static int lpIh4[DECIMATION];
static int lpQh4[DECIMATION];
int lpIa4 = 0;
int lpQa4 = 0;
#endif
int64_t dcI = 0, dcQ = 0;
while (true) {
@ -685,6 +692,11 @@ static void rf_rx(void)
lpIa3 += I - lpIh3[d];
lpIh3[d] = I;
I = lpIa3 / DECIMATION;
#endif
#if LPF_ORDER >= 4
lpIa4 += I - lpIh4[d];
lpIh4[d] = I;
I = lpIa4 / DECIMATION;
#endif
dI += I;
}
@ -720,6 +732,11 @@ static void rf_rx(void)
lpQa3 += Q - lpQh3[d];
lpQh3[d] = Q;
Q = lpQa3 / DECIMATION;
#endif
#if LPF_ORDER >= 4
lpQa4 += Q - lpQh4[d];
lpQh4[d] = Q;
Q = lpQa4 / DECIMATION;
#endif
dQ += Q;
}