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Merge pull request #21555 from HendrikVE/hendrik/dac-changes

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cpu/sam0_common: enable static voltages
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benpicco 2025-06-23 09:19:41 +00:00 committed by GitHub
commit 55c2061a42
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1 changed files with 32 additions and 4 deletions
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36
cpu/sam0_common/periph/dac.c
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@ -27,6 +27,14 @@
#define DAC_VAL(in) (in >> (16 - DAC_RES_BITS)) #define DAC_VAL(in) (in >> (16 - DAC_RES_BITS))
#ifndef CONFIG_SAM0_DAC_REFRESH
#define CONFIG_SAM0_DAC_REFRESH 2
#endif
#ifndef CONFIG_SAM0_DAC_RUN_ON_STANDBY
#define CONFIG_SAM0_DAC_RUN_ON_STANDBY 0
#endif
static void _dac_init_clock(dac_t line) static void _dac_init_clock(dac_t line)
{ {
sam0_gclk_enable(DAC_CLOCK); sam0_gclk_enable(DAC_CLOCK);
@ -110,13 +118,29 @@ int8_t dac_init(dac_t line)
_dac_init_clock(line); _dac_init_clock(line);
/* Settings can only be changed when DAC is disabled, reset config */ /* Settings can only be changed when DAC is disabled */
DAC->CTRLA.reg = DAC_CTRLA_SWRST; DAC->CTRLA.reg &= ~DAC_CTRLA_ENABLE;
_sync(); _sync();
#ifdef DAC_DACCTRL_ENABLE #ifdef DAC_DACCTRL_ENABLE
DAC->DACCTRL[line].reg = DAC_DACCTRL_ENABLE DAC->DACCTRL[line].reg = DAC_DACCTRL_ENABLE
| _get_CCTRL(sam0_gclk_freq(DAC_CLOCK)); | _get_CCTRL(sam0_gclk_freq(DAC_CLOCK))
#endif
#if CONFIG_SAM0_DAC_RUN_ON_STANDBY && defined(DAC_DACCTRL_RUNSTDBY)
| DAC_DACCTRL_RUNSTDBY
#endif
;
#ifdef DAC_DACCTRL_REFRESH
/** The DAC can only maintain its output on the desired value for approximately 100 μs.
* For static voltages the conversion must be refreshed periodically (see e.g.
* '47.6.9.3 Conversion Refresh' in the SAM D5xE5x family data sheet).
*
* Note: T_REFRESH = REFRESH * T_OSCULP32K
*/
static_assert(CONFIG_SAM0_DAC_REFRESH != 1, "DACCTRLx.REFRESH = 1 is reserved");
DAC->DACCTRL[line].bit.REFRESH = CONFIG_SAM0_DAC_REFRESH;
#endif #endif
/* Set Reference Voltage & enable Output if needed */ /* Set Reference Voltage & enable Output if needed */
@ -126,7 +150,11 @@ int8_t dac_init(dac_t line)
#endif #endif
; ;
DAC->CTRLA.reg = DAC_CTRLA_ENABLE; DAC->CTRLA.reg = DAC_CTRLA_ENABLE
#if CONFIG_SAM0_DAC_RUN_ON_STANDBY && defined(DAC_CTRLA_RUNSTDBY)
| DAC_CTRLA_RUNSTDBY
#endif
;
_sync(); _sync();
#ifdef DAC_STATUS_READY #ifdef DAC_STATUS_READY