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cpu/stm32/periph_dac: support for internal V_REF+

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For boards that have not connected the V_REF+ pin to an external reference voltage, the VREFBUF peripheral can be used as V_REF+ if supported by setting `VREFBUF_ENABLE=1`.
This commit is contained in:
Gunar Schorcht 2023-05-10 08:40:04 +02:00
parent 63b4da3e1f
commit fb0a139eb9
1 changed files with 10 additions and 0 deletions
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10
cpu/stm32/periph/dac.c
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@ -99,6 +99,16 @@ void dac_poweron(dac_t line)
periph_clk_en(APB1, RCC_BIT);
#endif
#if VREFBUF_ENABLE && defined(VREFBUF_CSR_ENVR)
/* enable VREFBUF if needed and available (for example if the board doesn't
* have an external reference voltage connected to V_REF+), wait until
* it is ready */
RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
VREFBUF->CSR &= ~VREFBUF_CSR_HIZ;
VREFBUF->CSR |= VREFBUF_CSR_ENVR;
while (!(VREFBUF->CSR & VREFBUF_CSR_VRR)) { }
#endif
/* enable corresponding DAC channel */
dev(line)->CR |= (1 << (16 * (dac_config[line].chan & 0x01)));
}