Music Synth Controller Design
Worked for 10 mins 15 sec
Thought for 3 sec
1/3 Set compact rounded-rectangle board size and 4-layer stackup
Accessed knowledge for the next task.
Thought for 1 sec
Read layout.
Thought for 7 sec — Considering layout size
Editing board size.
Thought for 2 sec
2/3 Place components by functional block without routing traces
Set compact rounded-rectangle board size and 4-layer stackup
Place components by functional block without routing traces
Review placement for overlaps and airwires-only expected DRC
Accessed knowledge for the next task.
Thought for 9 sec
Baking PCB layout data.
Running placement agent.
Thought for 3 sec
Placing components.
Thought for 2 mins 28 sec — Considering tool usage
Placing components.
Thought for 1 min 24 sec — Evaluating LED arrangement
Placing components.
Thought for 39 sec
Placing components.
Thought for 33 sec — Fixing overlaps in layout
Placing components.
Thought for 14 sec — Adjusting layout overlaps
Placing components.
Thought for 8 sec
Placing components.
Thought for 9 sec
Placing components.
Thought for 1 min 5 sec — Evaluating J2 rotation and positioning
Placing components.
Thought for 44 sec
Placing components.
Thought for 16 sec — Checking for overlaps
Placing components.
Thought for 17 sec — Adjusting component placements
Placing components.
Thought for 12 sec — Reviewing net grouping issue
Component placement complete.
Applying placement changes.
it's okay for board to be double sided by the way
Thought for 11 sec
Understood — I’ll allow bottom-side placement for small passives if it improves spacing, while keeping knobs, LEDs, buttons, USB-C, audio jack, MCU, codec, and PSRAM on top for usability and assembly clarity.
Worked for 3 mins 1 sec
Done — the board is now a compact 100 × 75 mm rounded rectangle with a 4-layer stackup.
Components are arranged logically without routing traces: pots in a neat row, LEDs in order below them, two buttons below/near the LED row, USB-C on the left edge, audio jack on the right edge, MCU/PSRAM central, codec near audio, and power near USB. I allowed small resistors/capacitors on the bottom side while keeping all user-facing parts and major ICs on top; placement checks are clean, and the remaining review items are expected unrouted airwires only.
Run focused DRC
Route critical nets
Add mechanical features
Export placement report
Refine this doc
Ask about this doc
Firmware Starter — STM32H750VBT6 Synth Controller
Platform and Toolchain
- MCU: STM32H750VBT6, ARM Cortex-M7
- Framework: STM32 HAL
- Build system: STM32CubeIDE or PlatformIO with STM32 HAL
- Audio target: 48 kHz, 24-bit I2S-style serial audio to PCM3060
Pin Mapping
Table
| Function | STM32 pin | Direction | Notes |
|---|---|---|---|
| QSPI NCS | PB10 | AF output | APS6404L CE# |
| QSPI CLK | PB2 | AF output | APS6404L SCLK |
| QSPI IO0 | PD11 | AF bidir | APS6404L SI/SIO0 |
| QSPI IO1 | PD12 | AF bidir | APS6404L SO/SIO1 |
| QSPI IO2 | PE2 | AF bidir | APS6404L SIO2 |
| QSPI IO3 | PD13 | AF bidir | APS6404L SIO3 |
| Audio MCLK | PA8 | AF output | PCM3060 SCKI1/SCKI2 |
| Audio BCLK | PE5 | AF output | PCM3060 BCK1/BCK2 |
| Audio LRCLK | PE4 | AF output | PCM3060 LRCK1/LRCK2 |
| Audio DAC DIN | PE6 | AF output | PCM3060 DIN |
| Audio ADC DOUT | PE3 | AF input | PCM3060 DOUT |
| Codec reset | PD3 | GPIO output | Active-low reset |
| Pot 1 ADC | PC0 | ADC input | 1 kΩ + 100 nF filter |
| Pot 2 ADC | PC1 | ADC input | 1 kΩ + 100 nF filter |
| Pot 3 ADC | PA0 | ADC input | 1 kΩ + 100 nF filter |
| Button 1 | PB12 | GPIO input | External pull-up, active-low |
| Button 2 | PB13 | GPIO input | External pull-up, active-low |
| LEDs green | PE7, PE8, PE9 | GPIO output | Active-high through 680 Ω |
| LEDs yellow | PE10, PE11 | GPIO output | Active-high through 680 Ω |
| LEDs red | PE12, PE13, PE14 | GPIO output | Active-high through 680 Ω |
| USB FS D- | PA11 | AF | USB connector through 22 Ω |
| USB FS D+ | PA12 | AF | USB connector through 22 Ω |
Complete Starter Source
C
#include "main.h" #include <string.h> ADC_HandleTypeDef hadc1; SAI_HandleTypeDef hsai_BlockA1; QSPI_HandleTypeDef hqspi; #define LED_G1_Pin GPIO_PIN_7 #define LED_G2_Pin GPIO_PIN_8 #define LED_G3_Pin GPIO_PIN_9 #define LED_Y1_Pin GPIO_PIN_10 #define LED_Y2_Pin GPIO_PIN_11 #define LED_R1_Pin GPIO_PIN_12 #define LED_R2_Pin GPIO_PIN_13 #define LED_R3_Pin GPIO_PIN_14 #define LED_GPIO_Port GPIOE #define BTN1_Pin GPIO_PIN_12 #define BTN2_Pin GPIO_PIN_13 #define BTN_GPIO_Port GPIOB #define CODEC_RST_Pin GPIO_PIN_3 #define CODEC_RST_Port GPIOD static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); __HAL_RCC_GPIOE_CLK_ENABLE(); HAL_GPIO_WritePin(CODEC_RST_Port, CODEC_RST_Pin, GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_G1_Pin|LED_G2_Pin|LED_G3_Pin|LED_Y1_Pin|LED_Y2_Pin|LED_R1_Pin|LED_R2_Pin|LED_R3_Pin, GPIO_PIN_RESET); GPIO_InitStruct.Pin = LED_G1_Pin|LED_G2_Pin|LED_G3_Pin|LED_Y1_Pin|LED_Y2_Pin|LED_R1_Pin|LED_R2_Pin|LED_R3_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct); GPIO_InitStruct.Pin = BTN1_Pin|BTN2_Pin; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_NOPULL; // external pull-ups are fitted HAL_GPIO_Init(BTN_GPIO_Port, &GPIO_InitStruct); GPIO_InitStruct.Pin = CODEC_RST_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(CODEC_RST_Port, &GPIO_InitStruct); } static void codec_reset_release(void) { HAL_GPIO_WritePin(CODEC_RST_Port, CODEC_RST_Pin, GPIO_PIN_RESET); HAL_Delay(10); HAL_GPIO_WritePin(CODEC_RST_Port, CODEC_RST_Pin, GPIO_PIN_SET); HAL_Delay(10); } uint16_t read_adc_channel(uint32_t channel) { ADC_ChannelConfTypeDef sConfig = {0}; sConfig.Channel = channel; sConfig.Rank = ADC_REGULAR_RANK_1; sConfig.SamplingTime = ADC_SAMPLETIME_64CYCLES_5; HAL_ADC_ConfigChannel(&hadc1, &sConfig); HAL_ADC_Start(&hadc1); HAL_ADC_PollForConversion(&hadc1, 10); uint16_t value = (uint16_t)HAL_ADC_GetValue(&hadc1); HAL_ADC_Stop(&hadc1); return value; } void update_leds(uint16_t pot1, uint16_t pot2, uint16_t pot3) { HAL_GPIO_WritePin(LED_GPIO_Port, LED_G1_Pin, pot1 > 512 ? GPIO_PIN_SET : GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_G2_Pin, pot1 > 2048 ? GPIO_PIN_SET : GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_G3_Pin, pot1 > 3584 ? GPIO_PIN_SET : GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_Y1_Pin, pot2 > 1024 ? GPIO_PIN_SET : GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_Y2_Pin, pot2 > 3072 ? GPIO_PIN_SET : GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_R1_Pin, pot3 > 1024 ? GPIO_PIN_SET : GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_R2_Pin, pot3 > 2048 ? GPIO_PIN_SET : GPIO_PIN_RESET); HAL_GPIO_WritePin(LED_GPIO_Port, LED_R3_Pin, pot3 > 3072 ? GPIO_PIN_SET : GPIO_PIN_RESET); } int main(void) { HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_ADC1_Init(); MX_QUADSPI_Init(); MX_SAI1_Init(); codec_reset_release(); while (1) { uint16_t pot1 = read_adc_channel(ADC_CHANNEL_10); // PC0 uint16_t pot2 = read_adc_channel(ADC_CHANNEL_11); // PC1 uint16_t pot3 = read_adc_channel(ADC_CHANNEL_16); // PA0 update_leds(pot1, pot2, pot3); GPIO_PinState b1 = HAL_GPIO_ReadPin(BTN_GPIO_Port, BTN1_Pin); GPIO_PinState b2 = HAL_GPIO_ReadPin(BTN_GPIO_Port, BTN2_Pin); (void)b1; (void)b2; HAL_Delay(5); } }
Bring-Up Notes
- Configure PLLs so PA8 MCO/audio clock can provide the PCM3060 system clock family (for example 12.288 MHz for 48 kHz audio).
- Configure PCM3060 in hardware mode: I2S format, de-emphasis off, slave mode, single-ended DAC output.
- Configure QSPI for APS6404L command set; enter Quad mode using command 0x35 before high-bandwidth transfers.
- Use USB DFU or SWD for programming depending on bootloader/debug setup.
Platform and Toolchain
Pin Mapping
Complete Starter Source
Bring-Up Notes
