# Adc Dac Baremetal

> Bare-metal ADC and DAC skill. Use when configuring analog sampling, DMA-driven ADC, calibration, or DAC output on MCUs. Activates on queries about ADC bare-metal, sampling time, DMA ADC, or DAC channel setup.

- **Type:** Skill
- **Install:** `agentstack add skill-mohitmishra786-low-level-dev-skills-adc-dac-baremetal`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [mohitmishra786](https://agentstack.voostack.com/s/mohitmishra786)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [mohitmishra786](https://github.com/mohitmishra786)
- **Source:** https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/adc-dac-baremetal
- **Website:** https://www.lowleveldevskills.com

## Install

```sh
agentstack add skill-mohitmishra786-low-level-dev-skills-adc-dac-baremetal
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# ADC and DAC (Bare-Metal)

## Purpose

Configure ADC and DAC peripherals: channel selection, sampling times, calibration sequences, DMA circular buffers, and DAC static/dynamic output.

## When to Use

- Reading analog sensors (temperature, voltage)
- Audio or control voltage output via DAC
- Continuous sampling with DMA
- Post-reset ADC calibration on STM32

## Workflow

### 1. STM32 ADC single conversion

```c
/* Enable ADC1 and GPIOA clock; PA0 analog mode */
ADC1->CR2 |= ADC_CR2_ADON;
for (volatile int i = 0; i SMPR2 |= ADC_SMPR2_SMP0_2;  /* 84 cycles sample time ch0 */
ADC1->SQR3   = 0;                 /* channel 0, 1 conversion */
ADC1->CR2   |= ADC_CR2_SWSTART;

while (!(ADC1->SR & ADC_SR_EOC))
    ;
uint16_t sample = ADC1->DR;
```

Run `ADC_Calibration()` / `ADC_CR2_RSTCAL/CAL` per RM on F1/F4 families.

### 2. DMA circular ADC

```c
/* ADC1 → DMA2 Stream0, circular mode into buffer[64] */
/* Configure DMA: periph-to-mem, halfword, increment mem, circular */
ADC1->CR2 |= ADC_CR2_DMA | ADC_CR2_CONT;
DMA2_Stream0->CR |= DMA_SxCR_EN;
```

Half-transfer / transfer-complete IRQs for double buffering.

### 3. DAC output (STM32)

```c
RCC->APB1ENR |= RCC_APB1ENR_DACEN;
DAC->CR |= DAC_CR_EN1;
DAC->DHR12R1 = 2048;  /* mid-scale 3.3V reference */
```

### 4. Agent usage

```
/adc-dac-baremetal Set up ADC1 channel 0 with DMA circular buffer
```

## Common Problems

| Symptom | Cause | Fix |
|---------|-------|-----|
| Noisy readings | Short sample time | Increase SMP bits |
| Stuck EOC | Clock not enabled | RCC ADC enable |
| Wrong voltage | Vref not 3.3V | Measure VDDA; calibrate |
| DMA corrupt | Buffer alignment | Use `uint16_t` aligned buffer |

## Related Skills

- `skills/baremetal/dma-baremetal` — ADC DMA streams
- `skills/baremetal/timers-pwm-baremetal` — ADC external trigger
- `skills/baremetal/gpio-baremetal` — analog pin mode

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [mohitmishra786](https://github.com/mohitmishra786)
- **Source:** [mohitmishra786/low-level-dev-skills](https://github.com/mohitmishra786/low-level-dev-skills)
- **License:** MIT
- **Homepage:** https://www.lowleveldevskills.com

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-mohitmishra786-low-level-dev-skills-adc-dac-baremetal
- Seller: https://agentstack.voostack.com/s/mohitmishra786
- Browse the marketplace: https://agentstack.voostack.com/browse

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