[riot-notifications] [RIOT-OS/RIOT] cpu/sam0_common: implement periph/dac (#13965)
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Fri May 1 15:34:29 CEST 2020
@dylad requested changes on this pull request.
Some minor changes should be applied but this is already in a pretty good shape.
- #define DAC_CLOCK_DEFAULT should belongs to boards/*/include/periph_conf.h
- Would be good to select the reference voltage through periph_conf.h too
I know VDDANA is broken on SAME54 so external reference must be used but VDDANA works on SAML21 for instance.
- SAML10/SAML11 DAC are connected to 32kHz GCLK ? Maybe it's time to allocate an unused GCLK to provide a faster clock.
> + * @author Benjamin Valentin <benpicco at beuth-hochschule.de>
+ * @}
+#define DAC_CLOCK DAC_CLOCK_DEFAULT
+#define DAC_VAL(in) (in >> (16 - DAC_RES_BITS))
I don't get this.
Why playing with the bit position here ?
In the current state, DAC_DACCTRL_LEFTADJ is set to 0 and we don't use dithering so we should write data to bits [0..9] or [0..11]. there is no need for this macro, just assign the value to the register directly.
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