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Adding 16 bit LFSR , to Noise Signal Generator App
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06643df6a5
commit
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@ -48,29 +48,30 @@ private:
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void update_tone();
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void update_tone();
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void on_tx_progress(const uint32_t progress, const bool done);
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void on_tx_progress(const uint32_t progress, const bool done);
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const std::string shape_strings[9] = {
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const std::string shape_strings[10] = {
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"CW ",
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"CW-no mod",
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"Sine ",
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"Sine ",
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"Triangle ",
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"Triangle ",
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"Saw up ",
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"Saw up ",
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"Saw down ",
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"Saw down ",
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"Square ",
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"Square ",
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"Noise n20Khz",
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"Noise 8-nx20Khz", // using 8 bits LFSR register, 6 order polynomial feedback.
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"Noise n10khz",
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"Noise 8-nx10khz", // using 8 bits LFSR register, 7 order polynomial feedback.
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"Noise n5khz "
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"Noise 8 -nx5khz ", // using 8 bits LFSR register, 8 order polynomial feedback.
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"Noise 16-nx1khz" // using 16 bits LFSR register, 16 order polynomial feedback.
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};
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};
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bool auto_update { false };
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bool auto_update { false };
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Labels labels {
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Labels labels {
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{ { 6 * 8, 4 + 10 }, "Shape:", Color::light_grey() },
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{ { 3 * 8, 4 + 10 }, "Shape:", Color::light_grey() },
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{ { 7 * 8, 7 * 8 }, "Tone: Hz", Color::light_grey() },
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{ { 6 * 8, 7 * 8 }, "Tone: Hz", Color::light_grey() },
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{ { 22 * 8, 15 * 8 + 4 }, "s.", Color::light_grey() },
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{ { 22 * 8, 15 * 8 + 4 }, "s.", Color::light_grey() },
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{ { 8 * 8, 20 * 8 }, "Modulation: FM", Color::light_grey() }
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{ { 8 * 8, 20 * 8 }, "Modulation: FM", Color::light_grey() }
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};
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};
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ImageOptionsField options_shape {
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ImageOptionsField options_shape {
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{ 13 * 8, 4, 32, 32 },
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{ 10 * 8, 4, 32, 32 },
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Color::white(),
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Color::white(),
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Color::black(),
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Color::black(),
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{
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{
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@ -82,12 +83,13 @@ private:
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{ &bitmap_sig_square, 5 },
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{ &bitmap_sig_square, 5 },
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{ &bitmap_sig_noise, 6 },
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{ &bitmap_sig_noise, 6 },
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{ &bitmap_sig_noise, 7 },
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{ &bitmap_sig_noise, 7 },
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{ &bitmap_sig_noise, 8 }
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{ &bitmap_sig_noise, 8 },
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{ &bitmap_sig_noise, 9 }
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}
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}
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};
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};
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Text text_shape {
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Text text_shape {
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{ 18 * 8, 4 + 10, 8 * 8, 16 },
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{ 15 * 8, 4 + 10, 8 * 8, 16 },
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""
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""
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};
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};
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@ -98,12 +100,12 @@ private:
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};
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};
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Button button_update {
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Button button_update {
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{ 6 * 8, 10 * 8, 8 * 8, 3 * 8 },
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{ 5 * 8, 10 * 8, 8 * 8, 3 * 8 },
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"Update"
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"Update"
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};
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};
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Checkbox checkbox_auto {
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Checkbox checkbox_auto {
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{ 16 * 8, 10 * 8 },
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{ 15 * 8, 10 * 8 },
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4,
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4,
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"Auto"
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"Auto"
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};
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};
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@ -75,6 +75,17 @@ void SigGenProcessor::execute(const buffer_c8_t& buffer) {
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bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 4)) & 1;
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bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 4)) & 1;
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lfsr = (lfsr >> 1) | (bit << 7);
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lfsr = (lfsr >> 1) | (bit << 7);
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sample = lfsr;
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sample = lfsr;
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} else if (tone_shape == 9) { // 16 bits LFSR .taps: 16, 15, 13, 4 ;feedback polynomial: x^16 + x^15 + x^13 + x^4 + 1
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// Periode 65535= 2^n-1, harmonics every < 1Khz , quite continuous .
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if (counter == 0) {
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bit_16 = ((lfsr_16 >> 0) ^ (lfsr_16 >> 1) ^ (lfsr_16 >> 3) ^ (lfsr_16 >> 4) ^ (lfsr_16 >> 12) & 1);
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lfsr_16 = (lfsr_16 >> 1) | (bit_16 << 15);
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sample = (lfsr_16 & 0x00FF);
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counter++;
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} else { // counter == 1 , no need to shift the register again, just use the top 8 bits.
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// sample = ((lfsr_16 & 0XFF00) >> 8); // it becomes less continuous the spectrum. Better skip it .
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counter = 0;
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}
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}
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}
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if (tone_shape < 6) {
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if (tone_shape < 6) {
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@ -114,8 +125,8 @@ void SigGenProcessor::on_message(const Message* const msg) {
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fm_delta = message.bw * (0xFFFFFFULL / 1536000);
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fm_delta = message.bw * (0xFFFFFFULL / 1536000);
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tone_shape = message.shape;
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tone_shape = message.shape;
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// lfsr = 0x54DF0119;
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lfsr = seed_value ; // init lfsr 8 bits.
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lfsr = seed_value ;
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lfsr_16 = seed_value_16; // init lfsr 16 bits.
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configured = true;
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configured = true;
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break;
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break;
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@ -44,9 +44,12 @@ private:
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bool auto_off { };
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bool auto_off { };
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int32_t phase { 0 }, sphase { 0 }, delta { 0 }; // they may have sign .
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int32_t phase { 0 }, sphase { 0 }, delta { 0 }; // they may have sign .
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int8_t sample { 0 }, re { 0 }, im { 0 }; // they may have sign .
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int8_t sample { 0 }, re { 0 }, im { 0 }; // they may have sign .
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uint8_t seed_value = {0x56}; // seed : any nonzero start state will work.
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uint8_t seed_value = {0x56}; // seed 8 bits lfsr : any nonzero start state will work.
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uint16_t seed_value_16 = {0xACE1}; // seed 16 bits lfsr : any nonzero start state will work.
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uint8_t lfsr { }, bit { }; // bit must be 8-bit to allow bit<<7 later in the code */
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uint8_t lfsr { }, bit { }; // bit must be 8-bit to allow bit<<7 later in the code */
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uint16_t lfsr_16 { }, bit_16 { }; // bit must be 8-bit to allow bit<<7 later in the code */
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uint8_t counter {0};
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TXProgressMessage txprogress_message { };
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TXProgressMessage txprogress_message { };
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};
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};
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