mohitmishra786/low-level-dev-skills

adc-dac-baremetal

Bare-metal ADC and DAC skill.

Quelltext ansehen

Verwendung

  1. Installationsbefehl kopieren und das Quellpaket vor der Installation in der eigenen Agentenumgebung prüfen.
  2. Benötigte Werkzeuge, Zugangsdaten und Hosts im Original prüfen.
  3. Eingabe und gewünschtes Ergebnis beschreiben und die Ausgabe mit den Quellen abgleichen.
npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill adc-dac-baremetal

Vor dem Start

  • Die Installation umfasst weder Modellabo noch API-Kontingent oder Dateizugriffsrechte.
  • Sterne und Installationen zeigen Aktivität, keine unabhängige Qualitäts- oder Sicherheitsprüfung.
Originales Skill-Dokument

Aus dem Quell-Repository gerendert; Überschriften, Beispiele, Code, Tabellen, Links und Bilder bleiben erhalten.

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 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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aus demselben Repository

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