kopia lustrzana https://github.com/bitluni/ESP32AMRadioTransmitter
added projects
bitluni
rodzic
1c4cf45e1a
commit
f7a56e8af4
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//code by bitluni (send me a high five if you like the code)
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//replace this include file by your header file generated by the conversion tool
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#include "sample.h"
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#include <soc/rtc.h>
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#include "driver/i2s.h"
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static const i2s_port_t i2s_num = (i2s_port_t)I2S_NUM_0; // i2s port number
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//static i2s_config_t i2s_config;
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static const i2s_config_t i2s_config = {
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.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN),
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.sample_rate = 1000000, //not really used
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.bits_per_sample = (i2s_bits_per_sample_t)I2S_BITS_PER_SAMPLE_16BIT,
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.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,
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.communication_format = I2S_COMM_FORMAT_I2S_MSB,
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.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
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.dma_buf_count = 2,
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.dma_buf_len = 1024 //big buffers to avoid noises
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};
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void setup()
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{
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Serial.begin(115200);
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rtc_clk_cpu_freq_set(RTC_CPU_FREQ_240M); //highest cpu frequency
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i2s_driver_install(i2s_num, &i2s_config, 0, NULL); //start i2s driver
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i2s_set_pin(i2s_num, NULL); //use internal DAC
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i2s_set_sample_rates(i2s_num, 1000000); //dummy sample rate, since the function fails at high values
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//this is the hack that enables the highest sampling rate possible ~13MHz, have fun
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SET_PERI_REG_BITS(I2S_CLKM_CONF_REG(0), I2S_CLKM_DIV_A_V, 1, I2S_CLKM_DIV_A_S);
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SET_PERI_REG_BITS(I2S_CLKM_CONF_REG(0), I2S_CLKM_DIV_B_V, 1, I2S_CLKM_DIV_B_S);
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SET_PERI_REG_BITS(I2S_CLKM_CONF_REG(0), I2S_CLKM_DIV_NUM_V, 2, I2S_CLKM_DIV_NUM_S);
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SET_PERI_REG_BITS(I2S_SAMPLE_RATE_CONF_REG(0), I2S_TX_BCK_DIV_NUM_V, 2, I2S_TX_BCK_DIV_NUM_S);
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}
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//buffer to store modulated samples
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short buff[1024];
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//sine represented in 16 values. at 13MHz sampling rate the resulting carrier is at around 835KHz
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int sintab[] = {0, 48, 90, 117, 127, 117, 90, 48, 0, -48, -90, -117, -127, -117, -90, -48};
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unsigned long long pos = 0; //current position in the audio sample, using fixed point
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unsigned int posLow = 0;
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unsigned long long posInc = ((unsigned long long)sampleRate << 32) / 835000; //sample fixed increment
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void loop()
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{
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//fill the sound buffer
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for(int i = 0; i < 1024; i+=16)
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{
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if(posLow >= sampleCount) posLow = sampleCount - 1;
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//taking current sample
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int s = samples[posLow] + 128;
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//modulating that sample on the 16 values of the carrier wave (respect to I2S byte order, 16Bit/Sample)
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for(int j = 0; j < 16; j += 4)
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{
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buff[i + j + 1] = (sintab[j + 0] * s + 0x8000);
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buff[i + j + 0] = (sintab[j + 1] * s + 0x8000);
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buff[i + j + 3] = (sintab[j + 2] * s + 0x8000);
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buff[i + j + 2] = (sintab[j + 3] * s + 0x8000);
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}
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pos += posInc;
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posLow = pos >> 32;
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if(posLow >= sampleCount)
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pos = posLow = 0;
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}
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//write the buffer (waits until a buffer is ready to be filled, that's timing for free)
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i2s_write_bytes(i2s_num, (char*)buff, 2048, portMAX_DELAY);
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}
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@ -0,0 +1,3 @@
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[LocalizedFileNames]
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nightsession.h=@nightsession.h,0
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nightsession (1).h=@nightsession (1).h,0
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Plik diff jest za duży
Load Diff
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@ -0,0 +1,81 @@
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//code by bitluni (send me a high five if you like the code)
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//replace this include file by your header file generated by the conversion tool
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#include "sample.h"
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//The pin where the button is connected to:
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const int BUTTON_PIN = 18;
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//(the button is connected between that pin and ground. the button is using the internal pullup)
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#include <soc/rtc.h>
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#include "driver/i2s.h"
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static const i2s_port_t i2s_num = (i2s_port_t)I2S_NUM_0; // i2s port number
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//static i2s_config_t i2s_config;
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static const i2s_config_t i2s_config = {
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.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN),
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.sample_rate = 1000000, //not really used
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.bits_per_sample = (i2s_bits_per_sample_t)I2S_BITS_PER_SAMPLE_16BIT,
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.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,
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.communication_format = I2S_COMM_FORMAT_I2S_MSB,
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.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
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.dma_buf_count = 2,
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.dma_buf_len = 1024 //big buffers to avoid noises
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};
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void setup()
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{
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pinMode(BUTTON_PIN, INPUT_PULLUP);
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Serial.begin(115200);
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rtc_clk_cpu_freq_set(RTC_CPU_FREQ_240M); //highest cpu frequency
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i2s_driver_install(i2s_num, &i2s_config, 0, NULL); //start i2s driver
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i2s_set_pin(i2s_num, NULL); //use internal DAC
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i2s_set_sample_rates(i2s_num, 1000000); //dummy sample rate, since the function fails at high values
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//this is the hack that enables the highest sampling rate possible ~13MHz, have fun
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SET_PERI_REG_BITS(I2S_CLKM_CONF_REG(0), I2S_CLKM_DIV_A_V, 1, I2S_CLKM_DIV_A_S);
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SET_PERI_REG_BITS(I2S_CLKM_CONF_REG(0), I2S_CLKM_DIV_B_V, 1, I2S_CLKM_DIV_B_S);
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SET_PERI_REG_BITS(I2S_CLKM_CONF_REG(0), I2S_CLKM_DIV_NUM_V, 2, I2S_CLKM_DIV_NUM_S);
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SET_PERI_REG_BITS(I2S_SAMPLE_RATE_CONF_REG(0), I2S_TX_BCK_DIV_NUM_V, 2, I2S_TX_BCK_DIV_NUM_S);
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}
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//buffer to store modulated samples
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short buff[1024];
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//sine represented in 16 values. at 13MHz sampling rate the resulting carrier is at around 835KHz
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int sintab[] = {0, 48, 90, 117, 127, 117, 90, 48, 0, -48, -90, -117, -127, -117, -90, -48};
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unsigned long long pos = 0; //current position in the audio sample, using fixed point
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unsigned int posLow = sampleCount; //set postion to end of sample to not play at reset
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unsigned long long posInc = ((unsigned long long)sampleRate << 32) / 835000; //sample fixed increment
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void loop()
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{
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//reset sample position when button is down
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if(!digitalRead(BUTTON_PIN))
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pos = posLow = 0;
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//fill the sound buffer
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for(int i = 0; i < 1024; i+=16)
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{
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if(posLow >= sampleCount) posLow = sampleCount - 1;
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//taking current sample
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int s = samples[posLow] + 128;
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//modulating that sample on the 16 values of the carrier wave (respect to I2S byte order, 16Bit/Sample)
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for(int j = 0; j < 16; j += 4)
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{
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buff[i + j + 1] = (sintab[j + 0] * s + 0x8000);
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buff[i + j + 0] = (sintab[j + 1] * s + 0x8000);
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buff[i + j + 3] = (sintab[j + 2] * s + 0x8000);
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buff[i + j + 2] = (sintab[j + 3] * s + 0x8000);
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}
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if(posLow < sampleCount - 1)
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{
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pos += posInc;
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posLow = pos >> 32;
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}
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}
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//write the buffer (waits until a buffer is ready to be filled, that's timing for free)
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i2s_write_bytes(i2s_num, (char*)buff, 2048, portMAX_DELAY);
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}
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Plik diff jest za duży
Load Diff
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@ -0,0 +1,89 @@
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<head>
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<script>
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window.AudioContext = window.AudioContext || window.webkitAudioContext;
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var context = new AudioContext();
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function audioBufferToText(audioBuffer, normalize, resample, sampleRate)
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{
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var buffer = audioBuffer.getChannelData(0);
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if(audioBuffer.numberOfChannels > 1)
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{
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for(var c = 1; c < audioBuffer.numberOfChannels; c++)
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{
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var cb = audioBuffer.getChannelData(c);
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for(var i = 0; i < length; i++)
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buffer[i] += cb[i];
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}
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}
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if(resample)
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{
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var scale = audioBuffer.sampleRate / sampleRate;
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var length = Math.floor((buffer.length - 1) / scale);
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var b = new Float32Array(length);
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for(var i = 0; i < length; i++)
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{
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p = Math.floor(i * scale);
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b[i] = buffer[p];
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}
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buffer = b;
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}
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else
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sampleRate = audioBuffer.sampleRate;
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var text = "const unsigned int sampleRate = " + sampleRate + ";\r\n";
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text += "const unsigned int sampleCount = " + buffer.length + ";\r\n";
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text += "const signed char samples[] = {"
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var max = 0;
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if(normalize)
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for(var i = 0; i < buffer.length; i++)
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max = Math.max(Math.abs(buffer[i]), max);
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if(max == 0) max = 1;
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for(var i = 0; i < buffer.length; i++)
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{
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if((i & 15) == 0) text += "\r\n";
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text += Math.round(buffer[i] / max * 127) + ", ";
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}
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text += "};\r\n";
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return text;
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}
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//isn't that simple code awesome? ...that's bitluni style
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function enrickSound(buffer)
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{
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//if you are looking for this function.. sorry that was a gag
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}
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function convert(event)
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{
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var audioBuffer = null;
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var reader = new FileReader();
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var file = event.target.files[0];
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reader.onload = function(){
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context.decodeAudioData(reader.result, function(buffer) {
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var link = document.createElement("a");
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link.download = file.name.split('.', 1)[0] + ".h";
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link.href = URL.createObjectURL(new Blob(
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[audioBufferToText(buffer, document.getElementById("normalize").checked, document.getElementById("resample").checked, document.getElementById("samplerate").value)], {type: "text/plain"}));
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document.body.appendChild(document.createElement("br"));
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document.body.appendChild(link);
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link.innerHTML = link.download;
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link.click();
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//document.body.removeChild(link);
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event.target.value = "";
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}, function(){
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//error
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});
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}
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reader.readAsArrayBuffer(file);
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}
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</script>
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</head>
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<body style="font-family: arial">
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<h1><a href="https://youtube.com/bitlunislab">bitluni</a>'s audio to header converter</h1>
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Open an audio file supported by the browser to convert it to a c++ header file (8Bit signed).<br><br>
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<input type="file" onchange="convert(event)"><br><br>
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Export: <input id="normalize" type="checkbox" checked>normalize <input id="resample" type="checkbox">resample <input id="samplerate" value="11025"><br>
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</body></html>
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