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* add examples/redpitaya/fft * jquery.flot.canvas in downloads * add fft in build_examples.sh [ci skip]
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@@ -96,4 +96,3 @@ web: | |
| - ./web/clock-generator.ts | ||
| - ./web/index.html | ||
| - ./web/main.css | ||
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| /// demodulator driver | ||
| /// | ||
| /// (c) Koheron | ||
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| #ifndef __DRIVERS_DEMODULATOR_HPP__ | ||
| #define __DRIVERS_DEMODULATOR_HPP__ | ||
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| #include <context.hpp> | ||
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| #include <array> | ||
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| // http://www.xilinx.com/support/documentation/ip_documentation/axi_fifo_mm_s/v4_1/pg080-axi-fifo-mm-s.pdf | ||
| namespace Fifo_regs { | ||
| constexpr uint32_t rdfr = 0x18; | ||
| constexpr uint32_t rdfo = 0x1C; | ||
| constexpr uint32_t rdfd = 0x20; | ||
| constexpr uint32_t rlr = 0x24; | ||
| } | ||
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| constexpr uint32_t fifo_buff_size = 8192 * 256; | ||
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| class Demodulator | ||
| { | ||
| public: | ||
| Demodulator(Context& _ctx) | ||
| : ctx(_ctx) | ||
| , ctl(ctx.mm.get<mem::control>()) | ||
| , adc_fifo_map(_ctx.mm.get<mem::adc_fifo>()) | ||
| { | ||
| start_fifo_acquisition(); | ||
| } | ||
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| ~Demodulator() { | ||
| fifo_acquisition_started = false; | ||
| fifo_thread.join(); | ||
| } | ||
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| void reset_fifo() {adc_fifo_map.write<Fifo_regs::rdfr>(0x000000A5);} | ||
| int32_t read_fifo() {return adc_fifo_map.read<Fifo_regs::rdfd>();} | ||
| uint32_t get_fifo_length() {return (adc_fifo_map.read<Fifo_regs::rlr>() & 0x3FFFFF) >> 2;} | ||
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| std::vector<int32_t>& get_vector(uint32_t n_pts) { | ||
| last_buffer_vect.resize(n_pts); | ||
| std::lock_guard<std::mutex> lock(mutex); | ||
| uint32_t start_idx = fifo_buff_idx - (fifo_buff_idx % 2); | ||
| for (uint32_t i = 0; i < n_pts; i++) { | ||
| last_buffer_vect[n_pts - 1 - i] = fifo_buffer[(start_idx - 1 - i) % fifo_buff_size]; | ||
| } | ||
| return last_buffer_vect; | ||
| } | ||
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| void start_fifo_acquisition(); | ||
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| private: | ||
| Context& ctx; | ||
| Memory<mem::control>& ctl; | ||
| Memory<mem::adc_fifo>& adc_fifo_map; | ||
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| std::mutex mutex; | ||
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| std::atomic<bool> fifo_acquisition_started{false}; | ||
| std::atomic<uint32_t> fifo_buff_idx{0}; | ||
| std::array<int32_t, fifo_buff_size> fifo_buffer; | ||
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| std::vector<int32_t> last_buffer_vect; | ||
| std::thread fifo_thread; | ||
| void fifo_acquisition_thread(); | ||
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| }; | ||
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| inline void Demodulator::start_fifo_acquisition() { | ||
| if (! fifo_acquisition_started) { | ||
| fifo_buffer.fill(0); | ||
| fifo_thread = std::thread{&Demodulator::fifo_acquisition_thread, this}; | ||
| fifo_thread.detach(); | ||
| } | ||
| } | ||
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| inline void Demodulator::fifo_acquisition_thread() | ||
| { | ||
| using namespace std::chrono_literals; | ||
| fifo_acquisition_started = true; | ||
| while (fifo_acquisition_started) { | ||
| { | ||
| std::lock_guard<std::mutex> lock(mutex); | ||
| const uint32_t n_pts = get_fifo_length(); | ||
| ctx.log<INFO>("fifo_length: %d \n", n_pts); | ||
| for (size_t i = 0; i < n_pts; i++) { | ||
| fifo_buffer[fifo_buff_idx] = read_fifo(); | ||
| fifo_buff_idx = (fifo_buff_idx + 1) % fifo_buff_size; | ||
| } | ||
| } | ||
| std::this_thread::sleep_for(10ms); | ||
| } | ||
| } | ||
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| #endif // __DRIVERS_DEMODULATOR_HPP__ |
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