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df386cd594
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#include "mode_audio.h" |
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#include <arm_math.h> |
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#include "bus/event_queue.h" |
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#include "dotmatrix.h" |
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static volatile bool capture_pending = false; |
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static volatile bool print_next_fft = false; |
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static float virt_zero_value = 2045.0f; |
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#define SAMP_BUF_LEN 256 |
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union samp_buf_union { |
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uint32_t uints[SAMP_BUF_LEN]; |
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float floats[SAMP_BUF_LEN]; |
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uint8_t as_bytes[SAMP_BUF_LEN*sizeof(uint32_t)]; |
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}; |
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// sample buffers (static - invalidated when sampling starts anew).
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static union samp_buf_union samp_buf; |
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// prototypes
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static void audio_capture_done(void* unused); |
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static void start_adc_dma(uint32_t *memory, uint32_t count) |
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{ |
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ADC_Cmd(ADC1, DISABLE); |
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DMA_DeInit(DMA1_Channel1); |
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DMA_InitTypeDef dma_cnf; |
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dma_cnf.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR; |
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dma_cnf.DMA_MemoryBaseAddr = (uint32_t)memory; |
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dma_cnf.DMA_DIR = DMA_DIR_PeripheralSRC; |
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dma_cnf.DMA_BufferSize = count; |
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dma_cnf.DMA_PeripheralInc = DMA_PeripheralInc_Disable; |
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dma_cnf.DMA_MemoryInc = DMA_MemoryInc_Enable; |
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dma_cnf.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; |
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dma_cnf.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; |
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dma_cnf.DMA_Mode = DMA_Mode_Normal; |
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dma_cnf.DMA_Priority = DMA_Priority_Low; |
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dma_cnf.DMA_M2M = DMA_M2M_Disable; |
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DMA_Init(DMA1_Channel1, &dma_cnf); |
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DMA_ITConfig(DMA1_Channel1, DMA1_IT_TC1, ENABLE); |
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ADC_Cmd(ADC1, ENABLE); |
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ADC_DMACmd(ADC1, ENABLE); |
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DMA_Cmd(DMA1_Channel1, ENABLE); |
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TIM_Cmd(TIM3, ENABLE); |
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} |
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void DMA1_Channel1_IRQHandler(void) |
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{ |
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DMA_ClearITPendingBit(DMA1_IT_TC1); |
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DMA_ClearITPendingBit(DMA1_IT_TE1); |
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DMA_DeInit(DMA1_Channel1); |
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TIM_Cmd(TIM3, DISABLE); |
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ADC_DMACmd(ADC1, DISABLE); |
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tq_post(audio_capture_done, NULL); |
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} |
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static void audio_capture_done(void* unused) |
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{ |
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(void)unused; |
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const int samp_count = SAMP_BUF_LEN/2; |
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const int bin_count = SAMP_BUF_LEN/4; |
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float *bins = samp_buf.floats; |
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// Convert to floats
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for (int i = 0; i < samp_count; i++) { |
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samp_buf.floats[i] = (float)samp_buf.uints[i]; |
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} |
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// normalize
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float mean; |
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arm_mean_f32(samp_buf.floats, samp_count, &mean); |
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virt_zero_value = mean; |
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for (int i = 0; i < samp_count; i++) { |
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samp_buf.floats[i] -= virt_zero_value; |
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} |
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if (print_next_fft) { |
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printf("--- Raw (adjusted) ---\n"); |
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for(int i = 0; i < samp_count; i++) { |
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printf("%.2f, ", samp_buf.floats[i]); |
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} |
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printf("\n"); |
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} |
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for (int i = samp_count - 1; i >= 0; i--) { |
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bins[i * 2 + 1] = 0; // imaginary
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bins[i * 2] = samp_buf.floats[i]; // real
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} |
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const arm_cfft_instance_f32 *S; |
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S = &arm_cfft_sR_f32_len128; |
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arm_cfft_f32(S, bins, 0, true); // bit reversed FFT
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arm_cmplx_mag_f32(bins, bins, bin_count); // get magnitude (extract real values)
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if (print_next_fft) { |
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printf("--- Bins ---\n"); |
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for(int i = 0; i < bin_count; i++) { |
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printf("%.2f, ", bins[i]); |
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} |
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printf("\n"); |
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} |
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// normalize
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dmtx_clear(dmtx); |
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float factor = (1.0f/bin_count)*0.2f; |
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for(int i = 0; i < bin_count-1; i+=2) { |
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bins[i] *= factor; |
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bins[i+1] *= factor; |
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//float avg = i==0 ? bins[1] : (bins[i] + bins[i+1])/2;
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float avg = (bins[i] + bins[i+1])/2; |
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for(int j = 0; j < 1+floorf(avg); j++) { |
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//dmtx_toggle(dmtx, i/2, j);
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dmtx_toggle(dmtx, i/2, j); |
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//dmtx_toggle(dmtx, j, 15-i/2);
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//dmtx_toggle(dmtx, 15- i/2, 15-j);
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} |
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} |
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dmtx_show(dmtx); |
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print_next_fft = false; |
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capture_pending = false; |
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} |
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void capture_audio(void *unused) |
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{ |
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(void)unused; |
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if (capture_pending) return; |
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capture_pending = true; |
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start_adc_dma(samp_buf.uints, SAMP_BUF_LEN/2); |
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} |
@ -0,0 +1,8 @@ |
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#ifndef MODE_AUDIO_H |
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#define MODE_AUDIO_H |
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#include "main.h" |
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void capture_audio(void *unused); |
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#endif // MODE_AUDIO_H
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