How to use
- Copy the installation command and review the source package before installing it in your own agent environment.
- Check the source document for required tools, credentials and supported hosts.
- Describe your input and desired deliverable; review the output against the source material.
npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill adc-dac-baremetalBefore you start
- Installation does not include a model subscription, API allowance or permission to access your files.
- Repository stars and installation counts describe activity, not an independent quality or security test.
Original skill document
Rendered from the source repository. Headings, examples, code, tables, links, and referenced images are preserved.
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 < 10000; i++); /* stabilization — RM value */
ADC1->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 bufferCommon 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 streamsskills/baremetal/timers-pwm-baremetal— ADC external triggerskills/baremetal/gpio-baremetal— analog pin mode
