Simple FM Sound Synthesis with touch screen and accelerometer control, based on STM32F746G-DISCO
Dependencies: ADXL345 AUDIO_DISCO_F746NG BSP_DISCO_F746NG LCD_DISCO_F746NG SDRAM_DISCO_F746NG TS_DISCO_F746NG mbed-dev
Fork of Workshop_5 by
sinth.cpp
- Committer:
- stefanofasciani
- Date:
- 2016-08-23
- Revision:
- 2:a1330350c32e
File content as of revision 2:a1330350c32e:
// Author: Stefano Fasciani - stefanofasciani@stefanofasciani.com // Date 7/8/2016 // FM Sinth for DISCO_F746NG and ADXL345 #include "sinth.h" float table[TABLE_SIZE]; int16_t out_buffer[AUDIO_BLOCK_SIZE*2]; float osc_buf[AUDIO_BLOCK_SIZE/2]; __IO uint32_t audio_out_buffer_state = BUFFER_OFFSET_NONE; float idx_1 = 0; float idx_2 = 0; float filt_old_samp = 0; static float frqTL = 0.04266666666667; static float two_pi_48k = 1.3089969389957471826927680763665e-4; int acc_readings[3]; int update_round = 0; void BSP_AUDIO_OUT_TransferComplete_CallBack(void){ audio_out_buffer_state = BUFFER_OFFSET_FULL; return; } void BSP_AUDIO_OUT_HalfTransfer_CallBack(void){ audio_out_buffer_state = BUFFER_OFFSET_HALF; return; } uint8_t SetSysClock_PLL_HSE_200MHz() { RCC_ClkInitTypeDef RCC_ClkInitStruct; RCC_OscInitTypeDef RCC_OscInitStruct; // Enable power clock __PWR_CLK_ENABLE(); // Enable HSE oscillator and activate PLL with HSE as source RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; /* External xtal on OSC_IN/OSC_OUT */ // Warning: this configuration is for a 25 MHz xtal clock only RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 25; // VCO input clock = 1 MHz (25 MHz / 25) RCC_OscInitStruct.PLL.PLLN = 400; // VCO output clock = 400 MHz (1 MHz * 400) RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; // PLLCLK = 200 MHz (400 MHz / 2) RCC_OscInitStruct.PLL.PLLQ = 8; // USB clock = 50 MHz (400 MHz / 8) if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { return 0; // FAIL } // Activate the OverDrive to reach the 216 MHz Frequency if (HAL_PWREx_EnableOverDrive() != HAL_OK) { return 0; // FAIL } // Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 200 MHz RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 200 MHz RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; // 50 MHz RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // 100 MHz if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK) { return 0; // FAIL } HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_4); return 1; // OK } void sint_osc(){ int i; float mod; int indexBase; float indexFract, value1, value2; for (i=0;i<AUDIO_BLOCK_SIZE/2;i++){ indexBase = floor(idx_2); indexFract = idx_2 - (float)indexBase; value1 = table[indexBase]; value2 = table[(indexBase+1)%TABLE_SIZE]; mod = moddepth*(value1 + ((value2 - value1) * indexFract)); indexBase = floor(idx_1); indexFract = idx_1 - (float)indexBase; value1 = table[indexBase]; value2 = table[(indexBase+1)%TABLE_SIZE]; osc_buf[i] = amplitude*(value1 + ((value2 - value1) * indexFract)); idx_1 = idx_1 + ((frqTL * pitch) + mod); while (idx_1 >= TABLE_SIZE){ idx_1 -= TABLE_SIZE; } while (idx_1 < 0){ idx_1 += TABLE_SIZE; } idx_2 = idx_2 + (frqTL * modrate); while (idx_2 >= TABLE_SIZE){ idx_2 -= TABLE_SIZE; } while (idx_2 < 0){ idx_2 += TABLE_SIZE; } } osc_buf[0] = filter*osc_buf[0] + (1-filter)*filt_old_samp; for(i=1;i<AUDIO_BLOCK_SIZE/2;i++){ osc_buf[i] = filter*osc_buf[i] + (1-filter)*osc_buf[i-1]; } filt_old_samp = osc_buf[(AUDIO_BLOCK_SIZE/2)-1]; return; } void copy_buffer(int offset){ int i; for(i=0;i<AUDIO_BLOCK_SIZE/2;i++){ out_buffer[offset+(i*2)] = out_buffer[offset+(i*2)+1] = (int16_t)(30000*osc_buf[i]); } return; } void init_sin_table(){ int i; for(i=0;i<TABLE_SIZE;i++){ table[i] = sinf((float)(two_pi_48k*(23.4375f)*(float)i)); } return; } float map_full(float x, float in_min, float in_max, float out_min, float out_max) { return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min; } float map(float x, float out_min, float out_max) { return (x - 0.0f) * (out_max - out_min) / (1.0f - 0.0f) + out_min; } float get_touch_horizontal(){ float temp = map_full(TS.touchX[0],1,480,0.0,1.0); if(temp > 1)temp=1; else if(temp < 0)temp=0; return temp; } float get_touch_vertical(){ float temp = map_full(TS.touchY[0],1,272,0.0,1.0); if(temp > 1)temp=1; else if(temp < 0)temp=0; return temp; } float get_acc_horizontal(){ float temp = map_full((float)(int16_t)acc_readings[1],230,-230,0.0,1.0); //for full range -/+256 if(temp > 1)temp=1; else if(temp < 0)temp=0; return temp; } float get_acc_vertical(){ float temp = map_full((float)(int16_t)acc_readings[0],230,-230,0.0,1.0); //for full range -/+256 if(temp > 1)temp=1; else if(temp < 0)temp=0; return temp; } void display_keyboard(){ lcd.SetTextColor(LCD_COLOR_LIGHTRED); lcd.FillRect(2,0,38,272); lcd.FillRect(82,0,38,272); lcd.FillRect(162,0,38,272); lcd.FillRect(202,0,38,272); lcd.FillRect(282,0,38,272); lcd.FillRect(362,0,38,272); lcd.FillRect(442,0,38,272); lcd.SetTextColor(LCD_COLOR_DARKRED); lcd.FillRect(42,0,38,272); lcd.FillRect(122,0,38,272); lcd.FillRect(242,0,38,272); lcd.FillRect(322,0,38,272); lcd.FillRect(402,0,38,272); lcd.SetTextColor(LCD_COLOR_BLACK); lcd.FillRect(1,21,480,232); return; } float get_note_pitch(){ float pitch = 0; if((TS.touchX[0]>=1)&&(TS.touchX[0]<=40)) pitch = 523.25f; else if((TS.touchX[0]>=41)&&(TS.touchX[0]<=80)) pitch = 554.37f; else if((TS.touchX[0]>=81)&&(TS.touchX[0]<=120)) pitch = 587.33f; else if((TS.touchX[0]>=121)&&(TS.touchX[0]<=160)) pitch = 622.25f; else if((TS.touchX[0]>=161)&&(TS.touchX[0]<=200)) pitch = 659.25f; else if((TS.touchX[0]>=201)&&(TS.touchX[0]<=240)) pitch = 698.46f; else if((TS.touchX[0]>=241)&&(TS.touchX[0]<=280)) pitch = 739.99f; else if((TS.touchX[0]>=281)&&(TS.touchX[0]<=320)) pitch = 783.99f; else if((TS.touchX[0]>=321)&&(TS.touchX[0]<=360)) pitch = 830.61f; else if((TS.touchX[0]>=361)&&(TS.touchX[0]<=400)) pitch = 880.00; else if((TS.touchX[0]>=401)&&(TS.touchX[0]<=440)) pitch = 932.33; else if((TS.touchX[0]>=441)&&(TS.touchX[0]<=480)) pitch = 987.77; return pitch; }