Ura
Dependencies: CMSIS_DSP_401 mbed
main.cpp@5:173ae8477ae1, 2014-11-11 (annotated)
- Committer:
- Sergeev
- Date:
- Tue Nov 11 16:41:53 2014 +0000
- Revision:
- 5:173ae8477ae1
- Parent:
- 4:397e8f4699df
- Child:
- 6:0de27f5ec409
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Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Sergeev | 0:b712470aea1d | 1 | #include "mbed.h" |
Sergeev | 1:9b1df0b2507d | 2 | #include <ctype.h> |
Sergeev | 0:b712470aea1d | 3 | #include "arm_math.h" |
Sergeev | 1:9b1df0b2507d | 4 | #include "arm_const_structs.h" |
Sergeev | 1:9b1df0b2507d | 5 | |
Sergeev | 1:9b1df0b2507d | 6 | void arm_cfft_f32( |
Sergeev | 1:9b1df0b2507d | 7 | const arm_cfft_instance_f32 * S, |
Sergeev | 1:9b1df0b2507d | 8 | float32_t * p1, |
Sergeev | 1:9b1df0b2507d | 9 | uint8_t ifftFlag, |
Sergeev | 1:9b1df0b2507d | 10 | uint8_t bitReverseFlag); |
Sergeev | 0:b712470aea1d | 11 | |
Sergeev | 5:173ae8477ae1 | 12 | Serial pc(USBTX, USBRX);//:D ПРИВЕТ!!!! |
Sergeev | 5:173ae8477ae1 | 13 | |
Sergeev | 5:173ae8477ae1 | 14 | |
Sergeev | 1:9b1df0b2507d | 15 | |
Sergeev | 1:9b1df0b2507d | 16 | AnalogIn left(A2); |
Sergeev | 1:9b1df0b2507d | 17 | AnalogIn right(A3); |
Sergeev | 5:173ae8477ae1 | 18 | AnalogIn center(A3); |
Sergeev | 1:9b1df0b2507d | 19 | |
Sergeev | 1:9b1df0b2507d | 20 | int SAMPLE_RATE_HZ = 40000; // Sample rate of the audio in hertz. |
Sergeev | 5:173ae8477ae1 | 21 | //const int FFT_SIZE = 16; // Size of the FFT. |
Sergeev | 5:173ae8477ae1 | 22 | const int FFT_SIZE = 1024; // Size of the FFT. |
Sergeev | 1:9b1df0b2507d | 23 | |
Sergeev | 1:9b1df0b2507d | 24 | const static arm_cfft_instance_f32 *S; |
Sergeev | 3:1f56b8f439a1 | 25 | //static arm_cfft_radix2_instance_f32 *S; |
Sergeev | 1:9b1df0b2507d | 26 | Ticker samplingTimer; |
Sergeev | 1:9b1df0b2507d | 27 | float samples[FFT_SIZE*2]; |
Sergeev | 5:173ae8477ae1 | 28 | float samples2[FFT_SIZE*2]; |
Sergeev | 5:173ae8477ae1 | 29 | float samples3[FFT_SIZE*2]; |
Sergeev | 5:173ae8477ae1 | 30 | |
Sergeev | 1:9b1df0b2507d | 31 | float magnitudes[FFT_SIZE]; |
Sergeev | 5:173ae8477ae1 | 32 | float magnitudes2[FFT_SIZE]; |
Sergeev | 5:173ae8477ae1 | 33 | float magnitudes3[FFT_SIZE]; |
Sergeev | 1:9b1df0b2507d | 34 | int sampleCounter = 0; |
Sergeev | 5:173ae8477ae1 | 35 | |
Sergeev | 1:9b1df0b2507d | 36 | |
Sergeev | 1:9b1df0b2507d | 37 | void samplingCallback() |
Sergeev | 3:1f56b8f439a1 | 38 | { |
Sergeev | 1:9b1df0b2507d | 39 | // Read from the ADC and store the sample data |
Sergeev | 3:1f56b8f439a1 | 40 | samples[sampleCounter] = 1000*left.read(); |
Sergeev | 5:173ae8477ae1 | 41 | samples2[sampleCounter] = 1000*left.read(); |
Sergeev | 5:173ae8477ae1 | 42 | samples3[sampleCounter] = 1000*left.read(); |
Sergeev | 1:9b1df0b2507d | 43 | // Complex FFT functions require a coefficient for the imaginary part of the input. |
Sergeev | 1:9b1df0b2507d | 44 | // Since we only have real data, set this coefficient to zero. |
Sergeev | 1:9b1df0b2507d | 45 | samples[sampleCounter+1] = 0.0; |
Sergeev | 5:173ae8477ae1 | 46 | samples2[sampleCounter+1] = 0.0; |
Sergeev | 5:173ae8477ae1 | 47 | samples3[sampleCounter+1] = 0.0; |
Sergeev | 1:9b1df0b2507d | 48 | // Update sample buffer position and stop after the buffer is filled |
Sergeev | 3:1f56b8f439a1 | 49 | |
Sergeev | 1:9b1df0b2507d | 50 | sampleCounter += 2; |
Sergeev | 2:707eb5bc5dfc | 51 | |
Sergeev | 1:9b1df0b2507d | 52 | if (sampleCounter >= FFT_SIZE*2) { |
Sergeev | 1:9b1df0b2507d | 53 | samplingTimer.detach(); |
Sergeev | 1:9b1df0b2507d | 54 | } |
Sergeev | 1:9b1df0b2507d | 55 | } |
Sergeev | 1:9b1df0b2507d | 56 | |
Sergeev | 1:9b1df0b2507d | 57 | void samplingBegin() |
Sergeev | 1:9b1df0b2507d | 58 | { |
Sergeev | 1:9b1df0b2507d | 59 | // Reset sample buffer position and start callback at necessary rate. |
Sergeev | 1:9b1df0b2507d | 60 | sampleCounter = 0; |
Sergeev | 3:1f56b8f439a1 | 61 | samplingTimer.attach_us(&samplingCallback, (float)(1000000/SAMPLE_RATE_HZ)); |
Sergeev | 1:9b1df0b2507d | 62 | } |
Sergeev | 1:9b1df0b2507d | 63 | |
Sergeev | 1:9b1df0b2507d | 64 | bool samplingIsDone() |
Sergeev | 1:9b1df0b2507d | 65 | { |
Sergeev | 1:9b1df0b2507d | 66 | return sampleCounter >= FFT_SIZE*2; |
Sergeev | 0:b712470aea1d | 67 | } |
Sergeev | 1:9b1df0b2507d | 68 | |
Sergeev | 1:9b1df0b2507d | 69 | int main() |
Sergeev | 0:b712470aea1d | 70 | { |
Sergeev | 1:9b1df0b2507d | 71 | // Set up serial port. |
Sergeev | 3:1f56b8f439a1 | 72 | //pc.baud (38400); |
Sergeev | 1:9b1df0b2507d | 73 | |
Sergeev | 1:9b1df0b2507d | 74 | // Init arm_ccft_32 |
Sergeev | 1:9b1df0b2507d | 75 | switch (FFT_SIZE) |
Sergeev | 1:9b1df0b2507d | 76 | { |
Sergeev | 1:9b1df0b2507d | 77 | case 16: |
Sergeev | 1:9b1df0b2507d | 78 | S = & arm_cfft_sR_f32_len16; |
Sergeev | 1:9b1df0b2507d | 79 | break; |
Sergeev | 1:9b1df0b2507d | 80 | case 32: |
Sergeev | 1:9b1df0b2507d | 81 | S = & arm_cfft_sR_f32_len32; |
Sergeev | 1:9b1df0b2507d | 82 | break; |
Sergeev | 1:9b1df0b2507d | 83 | case 64: |
Sergeev | 1:9b1df0b2507d | 84 | S = & arm_cfft_sR_f32_len64; |
Sergeev | 1:9b1df0b2507d | 85 | break; |
Sergeev | 1:9b1df0b2507d | 86 | case 128: |
Sergeev | 1:9b1df0b2507d | 87 | S = & arm_cfft_sR_f32_len128; |
Sergeev | 1:9b1df0b2507d | 88 | break; |
Sergeev | 1:9b1df0b2507d | 89 | case 256: |
Sergeev | 1:9b1df0b2507d | 90 | S = & arm_cfft_sR_f32_len256; |
Sergeev | 1:9b1df0b2507d | 91 | break; |
Sergeev | 1:9b1df0b2507d | 92 | case 512: |
Sergeev | 1:9b1df0b2507d | 93 | S = & arm_cfft_sR_f32_len512; |
Sergeev | 1:9b1df0b2507d | 94 | break; |
Sergeev | 1:9b1df0b2507d | 95 | case 1024: |
Sergeev | 1:9b1df0b2507d | 96 | S = & arm_cfft_sR_f32_len1024; |
Sergeev | 1:9b1df0b2507d | 97 | break; |
Sergeev | 1:9b1df0b2507d | 98 | case 2048: |
Sergeev | 1:9b1df0b2507d | 99 | S = & arm_cfft_sR_f32_len2048; |
Sergeev | 1:9b1df0b2507d | 100 | break; |
Sergeev | 1:9b1df0b2507d | 101 | case 4096: |
Sergeev | 1:9b1df0b2507d | 102 | S = & arm_cfft_sR_f32_len4096; |
Sergeev | 1:9b1df0b2507d | 103 | break; |
Sergeev | 1:9b1df0b2507d | 104 | } |
Sergeev | 1:9b1df0b2507d | 105 | float maxValue = 0.0f; |
Sergeev | 5:173ae8477ae1 | 106 | float maxValue2 = 0.0f; |
Sergeev | 5:173ae8477ae1 | 107 | float maxValue3 = 0.0f; |
Sergeev | 5:173ae8477ae1 | 108 | |
Sergeev | 1:9b1df0b2507d | 109 | unsigned int testIndex = 0; |
Sergeev | 5:173ae8477ae1 | 110 | unsigned int testIndex2 = 0; |
Sergeev | 5:173ae8477ae1 | 111 | unsigned int testIndex3 = 0; |
Sergeev | 1:9b1df0b2507d | 112 | |
Sergeev | 1:9b1df0b2507d | 113 | // Begin sampling audio |
Sergeev | 1:9b1df0b2507d | 114 | samplingBegin(); |
Sergeev | 1:9b1df0b2507d | 115 | |
Sergeev | 1:9b1df0b2507d | 116 | while(1) |
Sergeev | 1:9b1df0b2507d | 117 | { |
Sergeev | 1:9b1df0b2507d | 118 | // Calculate FFT if a full sample is available. |
Sergeev | 1:9b1df0b2507d | 119 | if (samplingIsDone()) |
Sergeev | 3:1f56b8f439a1 | 120 | { |
Sergeev | 1:9b1df0b2507d | 121 | // Run FFT on sample data. |
Sergeev | 1:9b1df0b2507d | 122 | //arm_cfft_radix2_f32(arm_cfft_radix2_instance_f32*S, samples); |
Sergeev | 1:9b1df0b2507d | 123 | arm_cfft_f32(S, samples, 0, 1); |
Sergeev | 5:173ae8477ae1 | 124 | arm_cfft_f32(S, samples2, 0, 1); |
Sergeev | 5:173ae8477ae1 | 125 | arm_cfft_f32(S, samples3, 0, 1); |
Sergeev | 5:173ae8477ae1 | 126 | samples[0]=0; |
Sergeev | 5:173ae8477ae1 | 127 | samples2[0]=0; |
Sergeev | 5:173ae8477ae1 | 128 | samples3[0]=0; |
Sergeev | 5:173ae8477ae1 | 129 | |
Sergeev | 3:1f56b8f439a1 | 130 | /* Initialize the CFFT/CIFFT module */ |
Sergeev | 3:1f56b8f439a1 | 131 | //arm_cfft_radix2_init_f32(S, 128, 0, 1); |
Sergeev | 3:1f56b8f439a1 | 132 | //arm_cfft_radix2_f32(S, samples); |
Sergeev | 5:173ae8477ae1 | 133 | //for(int i = 0;i < FFT_SIZE*2;++i) |
Sergeev | 5:173ae8477ae1 | 134 | // pc.printf(" Samples[%d]: %8.2f ",i,samples[i]); |
Sergeev | 5:173ae8477ae1 | 135 | //pc.printf("\r\n"); |
Sergeev | 1:9b1df0b2507d | 136 | // Calculate magnitude of complex numbers output by the FFT. |
Sergeev | 1:9b1df0b2507d | 137 | arm_cmplx_mag_f32(samples, magnitudes, FFT_SIZE); |
Sergeev | 5:173ae8477ae1 | 138 | arm_cmplx_mag_f32(samples2, magnitudes2, FFT_SIZE); |
Sergeev | 5:173ae8477ae1 | 139 | arm_cmplx_mag_f32(samples3, magnitudes3, FFT_SIZE); |
Sergeev | 5:173ae8477ae1 | 140 | |
Sergeev | 5:173ae8477ae1 | 141 | //for(int i = 0;i < FFT_SIZE;++i) |
Sergeev | 5:173ae8477ae1 | 142 | // pc.printf(" Magnitude: %d = %8.2f ;", i, magnitudes[i]); |
Sergeev | 5:173ae8477ae1 | 143 | //pc.printf(" \r\n"); |
Sergeev | 1:9b1df0b2507d | 144 | arm_max_f32(magnitudes, FFT_SIZE, &maxValue, &testIndex); |
Sergeev | 5:173ae8477ae1 | 145 | arm_max_f32(magnitudes2, FFT_SIZE, &maxValue2, &testIndex2); |
Sergeev | 5:173ae8477ae1 | 146 | arm_max_f32(magnitudes3, FFT_SIZE, &maxValue3, &testIndex3); |
Sergeev | 5:173ae8477ae1 | 147 | pc.printf(" MAX value at magnitudes 1[%d] : %+8.2f\r\n", testIndex, maxValue);//Я НЯШКА А АНЯ ВЛАСЮК КОЗА:DDDDDDDDDDDDD |
Sergeev | 5:173ae8477ae1 | 148 | pc.printf(" MAX value at magnitudes 2[%d] : %+8.2f\r\n", testIndex2, maxValue2); |
Sergeev | 5:173ae8477ae1 | 149 | pc.printf(" MAX value at magnitudes 3[%d] : %+8.2f\r\n", testIndex3, maxValue3); |
Sergeev | 5:173ae8477ae1 | 150 | |
Sergeev | 5:173ae8477ae1 | 151 | double delta_t = 0; |
Sergeev | 5:173ae8477ae1 | 152 | if ((testIndex < testIndex2) and (testIndex < testIndex3) and (testIndex2 < testIndex3)) |
Sergeev | 5:173ae8477ae1 | 153 | delta_t = (testIndex3 - testIndex)*0.000025; |
Sergeev | 5:173ae8477ae1 | 154 | else if ((testIndex < testIndex2)and(testIndex < testIndex3)and(testIndex2 > testIndex3)) |
Sergeev | 5:173ae8477ae1 | 155 | delta_t = (testIndex2 - testIndex)*0.000025; |
Sergeev | 5:173ae8477ae1 | 156 | else if ((testIndex2 < testIndex3)and(testIndex2 < testIndex)and(testIndex < testIndex3)) |
Sergeev | 5:173ae8477ae1 | 157 | delta_t = (testIndex3 - testIndex2)*0.000025; |
Sergeev | 5:173ae8477ae1 | 158 | else if ((testIndex2 < testIndex3)and(testIndex2 < testIndex)and(testIndex > testIndex3)) |
Sergeev | 5:173ae8477ae1 | 159 | delta_t = (testIndex - testIndex3)*0.000025; |
Sergeev | 5:173ae8477ae1 | 160 | else if (testIndex2 < testIndex) |
Sergeev | 5:173ae8477ae1 | 161 | delta_t = (testIndex - testIndex3)*0.000025; |
Sergeev | 5:173ae8477ae1 | 162 | else |
Sergeev | 5:173ae8477ae1 | 163 | delta_t = (testIndex - testIndex2)*0.000025; |
Sergeev | 5:173ae8477ae1 | 164 | double fi = asin(330*delta_t/0.33); |
Sergeev | 5:173ae8477ae1 | 165 | pc.printf(" Angle is : %+8.2f\r\n", fi); |
Sergeev | 5:173ae8477ae1 | 166 | |
Sergeev | 1:9b1df0b2507d | 167 | // Wait for user confirmation to restart audio sampling. |
Sergeev | 1:9b1df0b2507d | 168 | //pc.getc(); |
Sergeev | 1:9b1df0b2507d | 169 | wait(1); |
Sergeev | 1:9b1df0b2507d | 170 | samplingBegin(); |
Sergeev | 1:9b1df0b2507d | 171 | } |
Sergeev | 1:9b1df0b2507d | 172 | } |
Sergeev | 5:173ae8477ae1 | 173 | } |
Sergeev | 5:173ae8477ae1 | 174 |