|
|
|
@ -34,7 +34,7 @@ static constexpr auto MIC_BITS = 18u;
|
|
|
|
|
static constexpr auto SAMPLE_RATE = 48000u;
|
|
|
|
|
|
|
|
|
|
static constexpr unsigned I2S_BUFSIZ = 1024;
|
|
|
|
|
static constexpr unsigned I2S_STRIDE = 32:
|
|
|
|
|
static constexpr unsigned I2S_STRIDE = 32;
|
|
|
|
|
|
|
|
|
|
// Calculate reference amplitude value at compile time
|
|
|
|
|
static const auto MIC_REF_AMPL = sos_t((1 << (MIC_BITS - 1)) - 1) *
|
|
|
|
@ -45,6 +45,7 @@ static std::array<uint32_t, I2S_BUFSIZ> i2sBuffer;
|
|
|
|
|
static sos_t Leq_sum_sqr (0.f);
|
|
|
|
|
static unsigned Leq_samples = 0;
|
|
|
|
|
|
|
|
|
|
static void blinkDb(int db);
|
|
|
|
|
static void i2sCallback(I2SDriver *i2s);
|
|
|
|
|
|
|
|
|
|
static constexpr unsigned I2SPRval = 16'000'000 / SAMPLE_RATE / 32 / 2;
|
|
|
|
@ -64,49 +65,78 @@ int main(void)
|
|
|
|
|
{
|
|
|
|
|
halInit();
|
|
|
|
|
osalSysEnable();
|
|
|
|
|
//osalThreadSleepMilliseconds(2000);
|
|
|
|
|
|
|
|
|
|
palSetPadMode(GPIOB, 7, PAL_MODE_OUTPUT_PUSHPULL);
|
|
|
|
|
palSetPad(GPIOB, 7);
|
|
|
|
|
//palSetPadMode(GPIOF, 2, PAL_MODE_UNCONNECTED);
|
|
|
|
|
palSetLineMode(LINE_LED0, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED0);
|
|
|
|
|
palSetLineMode(LINE_LED1, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED1);
|
|
|
|
|
palSetLineMode(LINE_LED2, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED2);
|
|
|
|
|
palSetLineMode(LINE_LED3, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED3);
|
|
|
|
|
palSetLineMode(LINE_LED4, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED4);
|
|
|
|
|
palSetLineMode(LINE_LED5, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED5);
|
|
|
|
|
palSetLineMode(LINE_LED6, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED6);
|
|
|
|
|
palSetLineMode(LINE_LED7, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED7);
|
|
|
|
|
palSetLineMode(LINE_LED8, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED8);
|
|
|
|
|
palSetLineMode(LINE_LED9, PAL_MODE_OUTPUT_PUSHPULL); palSetLine(LINE_LED9);
|
|
|
|
|
palSetLineMode(LINE_I2S_SD, PAL_MODE_ALTERNATE(0));
|
|
|
|
|
palSetLineMode(LINE_I2S_WS, PAL_MODE_ALTERNATE(0));
|
|
|
|
|
palSetLineMode(LINE_I2S_CK, PAL_MODE_ALTERNATE(0));
|
|
|
|
|
//palSetLineMode(LINE_USART2_TX, PAL_MODE_ALTERNATE(1));
|
|
|
|
|
|
|
|
|
|
//sdStart(&SD2, NULL);
|
|
|
|
|
//sdWrite(&SD2, (uint8_t *)"Noisemeter\n", 11);
|
|
|
|
|
//osalThreadSleepMilliseconds(2);
|
|
|
|
|
|
|
|
|
|
i2sReady.store(true);
|
|
|
|
|
i2sStart(&I2SD1, &i2sConfig);
|
|
|
|
|
i2sStartExchange(&I2SD1);
|
|
|
|
|
// Microphone warmup time
|
|
|
|
|
osalThreadSleepMilliseconds(140);
|
|
|
|
|
// Reach filter delay steady state
|
|
|
|
|
i2sReady.store(false);
|
|
|
|
|
osalThreadSleepMilliseconds(120);
|
|
|
|
|
// Discard initial readings
|
|
|
|
|
Leq_sum_sqr = 0.f;
|
|
|
|
|
Leq_samples = 0;
|
|
|
|
|
|
|
|
|
|
uint8_t strbuf[7] = { 0, 0, 0, 'd', 'B', '\n', '\0' };
|
|
|
|
|
for (;;) {
|
|
|
|
|
i2sReady.store(false);
|
|
|
|
|
SCB->SCR |= SCB_SCR_SLEEPONEXIT_Msk;
|
|
|
|
|
__WFI();
|
|
|
|
|
|
|
|
|
|
//palSetPad(GPIOB, 7);
|
|
|
|
|
const sos_t Leq_RMS = qfp_fsqrt(Leq_sum_sqr / qfp_uint2float(Leq_samples));
|
|
|
|
|
const auto sum_sqr = std::exchange(Leq_sum_sqr, sos_t(0.f));
|
|
|
|
|
const auto count = std::exchange(Leq_samples, 0);
|
|
|
|
|
const sos_t Leq_RMS = qfp_fsqrt(sum_sqr / qfp_uint2float(count));
|
|
|
|
|
const sos_t Leq_dB = MIC_OFFSET_DB + MIC_REF_DB + sos_t(20.f) *
|
|
|
|
|
qfp_flog10(Leq_RMS / MIC_REF_AMPL);
|
|
|
|
|
Leq_sum_sqr = sos_t(0.f);
|
|
|
|
|
Leq_samples = 0;
|
|
|
|
|
|
|
|
|
|
auto n = std::clamp(qfp_float2int(Leq_dB), 0, 999);
|
|
|
|
|
palClearPad(GPIOB, 7);
|
|
|
|
|
osalThreadSleepMicroseconds(200);
|
|
|
|
|
palSetPad(GPIOB, 7);
|
|
|
|
|
//strbuf[2] = n % 10 + '0'; n /= 10;
|
|
|
|
|
//strbuf[1] = n % 10 + '0'; n /= 10;
|
|
|
|
|
//strbuf[0] = n ? n + '0' : ' ';
|
|
|
|
|
//sdWrite(&SD2, strbuf, sizeof(strbuf));
|
|
|
|
|
//osalThreadSleepMilliseconds(2);
|
|
|
|
|
////palClearPad(GPIOB, 7);
|
|
|
|
|
const auto n = std::clamp(qfp_float2int(Leq_dB), 0, 999);
|
|
|
|
|
blinkDb(n);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void blinkDb(int db)
|
|
|
|
|
{
|
|
|
|
|
auto line = LINE_LED0;
|
|
|
|
|
|
|
|
|
|
if (db < 45)
|
|
|
|
|
line = LINE_LED0;
|
|
|
|
|
else if (db < 55)
|
|
|
|
|
line = LINE_LED1;
|
|
|
|
|
else if (db < 65)
|
|
|
|
|
line = LINE_LED2;
|
|
|
|
|
else if (db < 75)
|
|
|
|
|
line = LINE_LED3;
|
|
|
|
|
else if (db < 82)
|
|
|
|
|
line = LINE_LED4;
|
|
|
|
|
else if (db < 87)
|
|
|
|
|
line = LINE_LED5;
|
|
|
|
|
else if (db < 92)
|
|
|
|
|
line = LINE_LED6;
|
|
|
|
|
else if (db < 97)
|
|
|
|
|
line = LINE_LED7;
|
|
|
|
|
else if (db < 102)
|
|
|
|
|
line = LINE_LED8;
|
|
|
|
|
else
|
|
|
|
|
line = LINE_LED9;
|
|
|
|
|
|
|
|
|
|
palClearLine(line);
|
|
|
|
|
osalThreadSleepMilliseconds(50);
|
|
|
|
|
palSetLine(line);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
__attribute__((section(".data")))
|
|
|
|
|
int32_t fixsample(uint32_t s) {
|
|
|
|
|
return (int32_t)(((s & 0xFFFF) << 16) | (s >> 16)) >> (32 - MIC_BITS);
|
|
|
|
@ -118,7 +148,6 @@ void i2sCallback(I2SDriver *i2s)
|
|
|
|
|
if (i2sReady.load())
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
//palSetPad(GPIOB, 7);
|
|
|
|
|
const auto halfsize = i2sBuffer.size() / 2;
|
|
|
|
|
const auto source = i2sBuffer.data() + (i2sIsBufferComplete(i2s) ? halfsize : 0);
|
|
|
|
|
auto samples = reinterpret_cast<sos_t *>(source);
|
|
|
|
@ -134,11 +163,10 @@ void i2sCallback(I2SDriver *i2s)
|
|
|
|
|
Leq_sum_sqr += WEIGHTING.filter_sum_sqr(samps);
|
|
|
|
|
Leq_samples += samps.size();
|
|
|
|
|
|
|
|
|
|
// Wakeup main thread for dB calculation every second
|
|
|
|
|
if (Leq_samples >= SAMPLE_RATE / I2S_STRIDE) {
|
|
|
|
|
// Wakeup main thread for dB calculation every half second
|
|
|
|
|
if (Leq_samples >= SAMPLE_RATE / I2S_STRIDE / 2) {
|
|
|
|
|
i2sReady.store(true);
|
|
|
|
|
SCB->SCR &= ~SCB_SCR_SLEEPONEXIT_Msk;
|
|
|
|
|
}
|
|
|
|
|
//palClearPad(GPIOB, 7);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|