Add the data packing and unpacking code.
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parent
c2ca65f889
commit
7ae77a01a9
5 changed files with 81 additions and 73 deletions
2
Conf.cpp
2
Conf.cpp
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@ -868,7 +868,7 @@ bool CConf::read()
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m_pocsagNetworkModeHang = (unsigned int)::atoi(value);
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else if (::strcmp(key, "Debug") == 0)
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m_pocsagNetworkDebug = ::atoi(value) == 1;
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} else if (section == SECTION_POCSAG_NETWORK) {
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} else if (section == SECTION_FM_NETWORK) {
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if (::strcmp(key, "Enable") == 0)
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m_fmNetworkEnabled = ::atoi(value) == 1;
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else if (::strcmp(key, "LocalAddress") == 0)
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132
FMControl.cpp
132
FMControl.cpp
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@ -19,13 +19,15 @@
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#include "FMControl.h"
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#include <string>
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#include <ctime>
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const uint8_t BIT_MASK_TABLE[] = { 0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U };
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#define WRITE_BIT(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
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#define READ_BIT(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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CFMControl::CFMControl(CFMNetwork* network) :
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m_network(network),
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m_queue(3000U, "FM Control"),
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m_enabled(false),
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m_fp(NULL)
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m_enabled(false)
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{
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assert(network != NULL);
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}
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@ -34,32 +36,90 @@ CFMControl::~CFMControl()
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{
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}
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bool CFMControl::writeModem(unsigned char* data, unsigned int len)
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bool CFMControl::writeModem(const unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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assert(len > 0U);
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assert(length > 0U);
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assert(m_network != NULL);
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// Unpack serial data (12-bit unsigned values)
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float samples[170U];
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unsigned int nSamples = 0U;
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// De-emphasise the data
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// Unpack the serial data into float values.
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for (unsigned int i = 0U; i < length; i += 3U) {
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unsigned short sample1 = 0U;
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unsigned short sample2 = 0U;
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unsigned short MASK = 0x0001U;
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// Repack the data (16-bit unsigned values)
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const unsigned char* base = data + i;
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for (unsigned int j = 0U; j < 12U; j++, MASK <<= 1) {
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unsigned int pos1 = j;
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unsigned int pos2 = j + 12U;
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return true;
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bool b1 = READ_BIT(base, pos1) != 0U;
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bool b2 = READ_BIT(base, pos2) != 0U;
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if (b1)
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sample1 |= MASK;
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if (b2)
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sample2 |= MASK;
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}
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// Convert from unsigned short (0 - +4095) to float (-1.0 - +1.0)
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samples[nSamples++] = (float(sample1) - 2048.0F) / 2048.0F;
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samples[nSamples++] = (float(sample2) - 2048.0F) / 2048.0F;
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}
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// De-emphasise the data and any other processing needed (maybe a low-pass filter to remove the CTCSS)
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unsigned char out[350U];
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unsigned int nOut = 0U;
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// Repack the data (8-bit unsigned values containing unsigned 16-bit data)
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for (unsigned int i = 0U; i < nSamples; i++) {
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unsigned short sample = (unsigned short)((samples[i] + 1.0F) * 32767.0F + 0.5F);
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out[nOut++] = (sample >> 8) & 0xFFU;
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out[nOut++] = (sample >> 0) & 0xFFU;
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}
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return m_network->write(out, nOut);
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}
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unsigned int CFMControl::readModem(unsigned char* data, unsigned int space)
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{
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assert(data != NULL);
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assert(space > 0U);
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assert(m_network != NULL);
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// Unpack serial data (16-bit unsigned values)
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// Pre-emphasise the data
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// Repack the data (12-bit unsigned values)
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unsigned char netData[300U];
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unsigned int length = m_network->read(netData, 270U);
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if (length == 0U)
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return 0U;
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float samples[170U];
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unsigned int nSamples = 0U;
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// Convert the unsigned 16-bit data (+65535 - 0) to float (+1.0 - -1.0)
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for (unsigned int i = 0U; i < length; i += 2U) {
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unsigned short sample = (netData[i + 0U] << 8) | netData[i + 1U];
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samples[nSamples++] = (float(sample) / 32767.0F) - 1.0F;
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}
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// Pre-emphasise the data and other stuff.
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// Pack the floating point data (+1.0 to -1.0) to packed 12-bit samples (+2047 - -2048)
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unsigned int offset = 0U;
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for (unsigned int i = 0U; i < nSamples; i++) {
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unsigned short sample = (unsigned short)((samples[i] + 1.0F) * 2048.0F + 0.5F);
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unsigned short MASK = 0x0001U;
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for (unsigned int j = 0U; j < 12U; j++, MASK <<= 1) {
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bool b = (sample & MASK) != 0U;
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WRITE_BIT(data, offset, b);
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offset++;
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}
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}
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return nSamples;
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}
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void CFMControl::clock(unsigned int ms)
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@ -71,43 +131,3 @@ void CFMControl::enable(bool enabled)
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{
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// May not be needed
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}
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bool CFMControl::openFile()
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{
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if (m_fp != NULL)
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return true;
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time_t t;
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::time(&t);
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struct tm* tm = ::localtime(&t);
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char name[100U];
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::sprintf(name, "FM_%04d%02d%02d_%02d%02d%02d.ambe", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
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m_fp = ::fopen(name, "wb");
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if (m_fp == NULL)
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return false;
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::fwrite("FM", 1U, 2U, m_fp);
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return true;
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}
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bool CFMControl::writeFile(const unsigned char* data, unsigned int length)
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{
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if (m_fp == NULL)
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return false;
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::fwrite(data, 1U, length, m_fp);
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return true;
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}
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void CFMControl::closeFile()
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{
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if (m_fp != NULL) {
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::fclose(m_fp);
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m_fp = NULL;
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}
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}
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14
FMControl.h
14
FMControl.h
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@ -20,20 +20,14 @@
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#define FMControl_H
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#include "FMNetwork.h"
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#include "RingBuffer.h"
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#include "StopWatch.h"
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#include "Defines.h"
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#include "Timer.h"
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#include "Modem.h"
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#include <string>
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class CFMControl {
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public:
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CFMControl(CFMNetwork* network);
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~CFMControl();
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bool writeModem(unsigned char* data, unsigned int length);
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bool writeModem(const unsigned char* data, unsigned int length);
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unsigned int readModem(unsigned char* data, unsigned int space);
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@ -43,13 +37,7 @@ public:
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private:
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CFMNetwork* m_network;
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CRingBuffer<unsigned short> m_queue;
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bool m_enabled;
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FILE* m_fp;
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bool openFile();
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bool writeFile(const unsigned char* data, unsigned int length);
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void closeFile();
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};
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#endif
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@ -811,11 +811,11 @@ int CMMDVMHost::run()
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}
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len = m_modem->readFMData(data);
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if (m_nxdn != NULL && len > 0U) {
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if (m_fm != NULL && len > 0U) {
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if (m_mode == MODE_IDLE) {
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bool ret = m_fm->writeModem(data, len);
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if (ret) {
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m_modeTimer.setTimeout(m_nxdnRFModeHang);
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m_modeTimer.setTimeout(m_nxdnRFModeHang); // XXX
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setMode(MODE_FM);
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}
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} else if (m_mode == MODE_FM) {
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@ -19,6 +19,6 @@
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#if !defined(VERSION_H)
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#define VERSION_H
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const char* VERSION = "20200506";
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const char* VERSION = "20200507";
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#endif
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