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Module17: made M17 baseband output have correct DC bias and amplitude 

Removed an old workaround for an hardware bug of Module17 rev 0.1b limiting
the output swing of baseband signal in newer hardware revisions.

Contribution by Mathis Schmieder DB9MAT.
This commit is contained in:
Silvano Seva 2023-11-21 18:46:03 +01:00
parent 7ccfbe62c8
commit 91c0965007
2 changed files with 1 additions and 6 deletions
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5
openrtx/include/protocols/M17/M17Modulator.hpp
View File

@ -106,13 +106,8 @@ private:
static constexpr size_t M17_SAMPLES_PER_SYMBOL = M17_TX_SAMPLE_RATE / M17_SYMBOL_RATE;
static constexpr size_t M17_FRAME_SAMPLES = M17_FRAME_SYMBOLS * M17_SAMPLES_PER_SYMBOL;
#ifdef PLATFORM_MOD17
static constexpr float M17_RRC_GAIN = 15000.0f;
static constexpr float M17_RRC_OFFSET = 11500.0f;
#else
static constexpr float M17_RRC_GAIN = 23000.0f;
static constexpr float M17_RRC_OFFSET = 0.0f;
#endif
std::array< int8_t, M17_FRAME_SYMBOLS > symbols;
std::unique_ptr< int16_t[] > baseband_buffer; ///< Buffer for baseband audio handling.

2
platform/drivers/audio/audio_Mod17.c
View File

@ -43,7 +43,7 @@ static const uint8_t pathCompatibilityMatrix[9][9] =
const struct audioDevice outputDevices[] =
{
{NULL, 0, 0, SINK_MCU},
{&stm32_dac_audio_driver, (const void *) 1365, STM32_DAC_CH1, SINK_RTX},
{&stm32_dac_audio_driver, (const void *) 2048, STM32_DAC_CH1, SINK_RTX},
{&stm32_dac_audio_driver, 0, STM32_DAC_CH2, SINK_SPK},
};