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mohitmishra786mohitmishra786/low-level-dev-skills/skills/baremetal/adc-dac-baremetal/SKILL.md

adc-dac-baremetal

Skill290 starsChanged 7 months agoMITView on GitHub

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.

The file

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1 rule. About 0 are common, 0 are distinctive, and 1 is very specific to this project.

  • ≈0

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  • Distinctive
  • Very specific
  1. Very specific:

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

    line 37

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

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Files
SKILL.md

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

/* 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

/* 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)

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

SymptomCauseFix
Noisy readingsShort sample timeIncrease SMP bits
Stuck EOCClock not enabledRCC ADC enable
Wrong voltageVref not 3.3VMeasure VDDA; calibrate
DMA corruptBuffer alignmentUse 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

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