Merge pull request #2951 from martinbudden/bf_blackbox_3svariable
Added TAG2_3SVARIABLE encoding
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commit
676fc30316
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@ -231,6 +231,129 @@ void blackboxWriteTag2_3S32(int32_t *values)
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}
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}
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/**
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* Write a 2 bit tag followed by 3 signed fields of 2, 554, 877 or 32 bits
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*/
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int blackboxWriteTag2_3SVariable(int32_t *values)
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{
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static const int FIELD_COUNT = 3;
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enum {
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BITS_2 = 0,
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BITS_554 = 1,
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BITS_877 = 2,
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BITS_32 = 3
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};
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enum {
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BYTES_1 = 0,
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BYTES_2 = 1,
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BYTES_3 = 2,
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BYTES_4 = 3
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};
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/*
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* Find out how many bits the largest value requires to encode, and use it to choose one of the packing schemes
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* below:
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*
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* Selector possibilities
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*
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* 2 bits per field ss11 2233,
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* 554 bits per field ss11 1112 2222 3333
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* 877 bits per field ss11 1111 1122 2222 2333 3333
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* 32 bits per field sstt tttt followed by fields of various byte counts
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*/
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int selector = BITS_2;
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int selector2 = 0;
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// Require more than 877 bits?
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if (values[0] >= 256 || values[0] < -256
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|| values[1] >= 128 || values[1] < -128
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|| values[2] >= 128 || values[2] < -128) {
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selector = BITS_32;
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// Require more than 554 bits?
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} else if (values[0] >= 16 || values[0] < -16
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|| values[1] >= 16 || values[1] < -16
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|| values[2] >= 8 || values[2] < -8) {
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selector = BITS_877;
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// Require more than 2 bits?
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} else if (values[0] >= 2 || values[0] < -2
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|| values[1] >= 2 || values[1] < -2
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|| values[2] >= 2 || values[2] < -2) {
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selector = BITS_554;
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}
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switch (selector) {
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case BITS_2:
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blackboxWrite((selector << 6) | ((values[0] & 0x03) << 4) | ((values[1] & 0x03) << 2) | (values[2] & 0x03));
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break;
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case BITS_554:
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// 554 bits per field ss11 1112 2222 3333
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blackboxWrite((selector << 6) | ((values[0] & 0x1F) << 1) | ((values[1] & 0x1F) >> 4));
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blackboxWrite(((values[1] & 0x0F) << 4) | (values[2] & 0x0F));
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break;
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case BITS_877:
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// 877 bits per field ss11 1111 1122 2222 2333 3333
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blackboxWrite((selector << 6) | ((values[0] & 0xFF) >> 2));
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blackboxWrite(((values[0] & 0x03) << 6) | ((values[1] & 0x7F) >> 1));
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blackboxWrite(((values[1] & 0x01) << 7) | (values[2] & 0x7F));
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break;
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case BITS_32:
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/*
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* Do another round to compute a selector for each field, assuming that they are at least 8 bits each
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*
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* Selector2 field possibilities
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* 0 - 8 bits
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* 1 - 16 bits
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* 2 - 24 bits
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* 3 - 32 bits
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*/
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selector2 = 0;
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//Encode in reverse order so the first field is in the low bits:
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for (int x = FIELD_COUNT - 1; x >= 0; x--) {
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selector2 <<= 2;
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if (values[x] < 128 && values[x] >= -128) {
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selector2 |= BYTES_1;
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} else if (values[x] < 32768 && values[x] >= -32768) {
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selector2 |= BYTES_2;
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} else if (values[x] < 8388608 && values[x] >= -8388608) {
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selector2 |= BYTES_3;
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} else {
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selector2 |= BYTES_4;
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}
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}
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//Write the selectors
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blackboxWrite((selector << 6) | selector2);
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//And now the values according to the selectors we picked for them
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for (int x = 0; x < FIELD_COUNT; x++, selector2 >>= 2) {
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switch (selector2 & 0x03) {
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case BYTES_1:
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blackboxWrite(values[x]);
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break;
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case BYTES_2:
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blackboxWrite(values[x]);
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blackboxWrite(values[x] >> 8);
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break;
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case BYTES_3:
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blackboxWrite(values[x]);
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blackboxWrite(values[x] >> 8);
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blackboxWrite(values[x] >> 16);
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break;
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case BYTES_4:
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blackboxWrite(values[x]);
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blackboxWrite(values[x] >> 8);
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blackboxWrite(values[x] >> 16);
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blackboxWrite(values[x] >> 24);
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break;
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}
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}
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break;
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}
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return selector;
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}
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/**
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* Write an 8-bit selector followed by four signed fields of size 0, 4, 8 or 16 bits.
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*/
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@ -27,6 +27,7 @@ void blackboxWriteSignedVBArray(int32_t *array, int count);
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void blackboxWriteSigned16VBArray(int16_t *array, int count);
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void blackboxWriteS16(int16_t value);
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void blackboxWriteTag2_3S32(int32_t *values);
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int blackboxWriteTag2_3SVariable(int32_t *values);
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void blackboxWriteTag8_4S16(int32_t *values);
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void blackboxWriteTag8_8SVB(int32_t *values, int valueCount);
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void blackboxWriteU32(int32_t value);
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@ -97,7 +97,8 @@ typedef enum FlightLogFieldEncoding {
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FLIGHT_LOG_FIELD_ENCODING_TAG8_8SVB = 6,
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FLIGHT_LOG_FIELD_ENCODING_TAG2_3S32 = 7,
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FLIGHT_LOG_FIELD_ENCODING_TAG8_4S16 = 8,
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FLIGHT_LOG_FIELD_ENCODING_NULL = 9 // Nothing is written to the file, take value to be zero
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FLIGHT_LOG_FIELD_ENCODING_NULL = 9, // Nothing is written to the file, take value to be zero
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FLIGHT_LOG_FIELD_ENCODING_TAG2_3SVARIABLE = 10
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} FlightLogFieldEncoding;
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typedef enum FlightLogFieldSign {
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@ -99,6 +99,7 @@ bool isSerialTransmitBufferEmpty(const serialPort_t *instance)
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void serialTestResetBuffers()
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{
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blackboxPort = &serialTestInstance;
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memset(&serialReadBuffer, 0, sizeof(serialReadBuffer));
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serialReadPos = 0;
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serialReadEnd = 0;
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@ -108,7 +109,8 @@ void serialTestResetBuffers()
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TEST(BlackboxEncodingTest, TestWriteUnsignedVB)
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{
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blackboxPort = &serialTestInstance;
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serialTestResetBuffers();
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blackboxWriteUnsignedVB(0);
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EXPECT_EQ(0, serialWriteBuffer[0]);
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blackboxWriteUnsignedVB(128);
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@ -116,6 +118,128 @@ TEST(BlackboxEncodingTest, TestWriteUnsignedVB)
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EXPECT_EQ(1, serialWriteBuffer[2]);
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}
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TEST(BlackboxTest, TestWriteTag2_3SVariable_BITS2)
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{
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serialTestResetBuffers();
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uint8_t *buf = &serialWriteBuffer[0];
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int selector;
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int32_t v[3];
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// 2 bits per field ss11 2233,
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v[0] = 0;
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v[1] = 0;
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v[2] = 0;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(0, selector);
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EXPECT_EQ(0, buf[0]);
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EXPECT_EQ(0, buf[1]); // ensure next byte has not been written
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++buf;
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v[0] = 1;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(0x10, buf[0]); // 00010000
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EXPECT_EQ(0, buf[1]); // ensure next byte has not been written
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++buf;
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v[0] = 1;
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v[1] = 1;
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v[2] = 1;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(0, selector);
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EXPECT_EQ(0x15, buf[0]); // 00010101
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EXPECT_EQ(0, buf[1]); // ensure next byte has not been written
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++buf;
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v[0] = -1;
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v[1] = -1;
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v[2] = -1;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(0, selector);
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EXPECT_EQ(0x3F, buf[0]); // 00111111
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EXPECT_EQ(0, buf[1]); // ensure next byte has not been written
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++buf;
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v[0] = -2;
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v[1] = -2;
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v[2] = -2;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(0, selector);
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EXPECT_EQ(0x2A, buf[0]); // 00101010
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EXPECT_EQ(0, buf[1]); // ensure next byte has not been written
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++buf;
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}
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TEST(BlackboxTest, TestWriteTag2_3SVariable_BITS554)
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{
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serialTestResetBuffers();
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uint8_t *buf = &serialWriteBuffer[0];
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int selector;
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int32_t v[3];
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// 554 bits per field ss11 1112 2222 3333
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// 5 bits per field [-16, 15], 4 bits per field [-8, 7]
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v[0] = 15;
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v[1] = 15;
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v[2] = 7;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(1, selector);
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EXPECT_EQ(0x5E, buf[0]); // 0101 1110
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EXPECT_EQ(0xF7, buf[1]); // 1111 0111
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EXPECT_EQ(0, buf[2]); // ensure next byte has not been written
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buf += 2;
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v[0] = -16;
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v[1] = -16;
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v[2] = -8;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(1, selector);
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EXPECT_EQ(0x61, buf[0]); // 0110 0001
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EXPECT_EQ(0x08, buf[1]); // 0000 1000
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EXPECT_EQ(0, buf[2]); // ensure next byte has not been written
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buf += 2;
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v[0] = 7;
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v[1] = 8;
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v[2] = 5;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(1, selector);
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EXPECT_EQ(0x4E, buf[0]); // 0100 1110
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EXPECT_EQ(0x85, buf[1]); // 1000 0101
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EXPECT_EQ(0, buf[2]); // ensure next byte has not been written
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buf += 2;
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}
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TEST(BlackboxTest, TestWriteTag2_3SVariable_BITS887)
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{
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serialTestResetBuffers();
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uint8_t *buf = &serialWriteBuffer[0];
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int selector;
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int32_t v[3];
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// 877 bits per field ss11 1111 1122 2222 2333 3333
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// 8 bits per field [-128, 127], 7 bits per field [-64, 63]
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v[0] = 127;
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v[1] = 63;
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v[2] = 63;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(2, selector);
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EXPECT_EQ(0x9F, buf[0]); // 1001 1111
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EXPECT_EQ(0xDF, buf[1]); // 1101 1111
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EXPECT_EQ(0xBF, buf[2]); // 1011 1111
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EXPECT_EQ(0, buf[3]); // ensure next byte has not been written
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buf += 3;
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v[0] = -128;
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v[1] = -64;
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v[2] = -64;
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selector = blackboxWriteTag2_3SVariable(v);
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EXPECT_EQ(2, selector);
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EXPECT_EQ(0xA0, buf[0]); // 1010 0000
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EXPECT_EQ(0x20, buf[1]); // 0010 0000
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EXPECT_EQ(0x40, buf[2]); // 0100 0000
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EXPECT_EQ(0, buf[3]); // ensure next byte has not been written
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buf += 3;
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}
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// STUBS
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extern "C" {
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PG_REGISTER(blackboxConfig_t, blackboxConfig, PG_BLACKBOX_CONFIG, 0);
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