63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
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// STl includes
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#include <iostream>
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#include <cmath>
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bool requiredTiming(const int tHigh_ns, const int tLow_ns, const int error_ns, const int nrBits)
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{
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std::cout << "=== " << nrBits << " bits case ===== " << std::endl;
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double bitLength_ns = (tHigh_ns + tLow_ns)/double(nrBits);
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double baudrate_Hz = 1.0 / bitLength_ns * 1e9;
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std::cout << "Required bit length: " << bitLength_ns << "ns => baudrate = " << baudrate_Hz << std::endl;
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double highBitsExact = tHigh_ns/bitLength_ns;
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int highBits = std::round(highBitsExact);
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double lowBitsExact = tLow_ns/bitLength_ns;
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int lowBits = std::round(lowBitsExact);
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std::cout << "Bit division: high=" << highBits << "(" << highBitsExact << "); low=" << lowBits << "(" << lowBitsExact << ")" << std::endl;
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double highBitsError = std::fabs(highBitsExact - highBits);
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double lowBitsError = std::fabs(highBitsExact - highBits);
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double highError_ns = highBitsError * bitLength_ns;
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double lowError_ns = lowBitsError * bitLength_ns;
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if (highError_ns > error_ns || lowError_ns > error_ns)
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{
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std::cerr << "Timing error outside specs: " << highError_ns << "; " << lowError_ns << " > " << error_ns << std::endl;
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}
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else
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{
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std::cout << "Timing within margins: " << highError_ns << "; " << lowError_ns << " < " << error_ns << std::endl;
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}
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return true;
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}
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int main()
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{
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// 10bits
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requiredTiming(400, 850, 150, 10); // Zero
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requiredTiming(800, 450, 150, 10); // One
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// 6bits
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requiredTiming(400, 850, 150, 6); // Zero
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requiredTiming(800, 450, 150, 6); // One
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// 5bits
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requiredTiming(400, 850, 150, 5); // Zero
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requiredTiming(800, 450, 150, 5); // One
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requiredTiming(650, 600, 150, 5); // One
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// 4bits
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requiredTiming(400, 850, 150, 4); // Zero
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requiredTiming(800, 450, 150, 4); // One
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// 3bits
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requiredTiming(400, 850, 150, 3); // Zero
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requiredTiming(800, 450, 150, 3); // One
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return 0;
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}
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