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cpu/stm32/periph_dac: support of DAC mode register

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If the DAC peripheral has a mode register (DAC_MCR), it is set to normal mode with buffer enabled and connected to external pin and on-chip peripherals. This allows to measure the current value of a DAC channel or to use the DAC channel also for other on-chip peripherals.
This commit is contained in:
Gunar Schorcht 2023-05-10 08:43:46 +02:00
parent fb0a139eb9
commit 2a210c157b
1 changed files with 8 additions and 2 deletions
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10
cpu/stm32/periph/dac.c
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@ -109,8 +109,14 @@ void dac_poweron(dac_t line)
while (!(VREFBUF->CSR & VREFBUF_CSR_VRR)) { }
#endif
#ifdef DAC_MCR_MODE1
/* Normal mode with Buffer enabled and connected to external pin and on-chip
* peripherals */
dev(line)->MCR |= (DAC_MCR_MODE1_0 << (16 * (dac_config[line].chan & 0x01)));
#endif
/* enable corresponding DAC channel */
dev(line)->CR |= (1 << (16 * (dac_config[line].chan & 0x01)));
dev(line)->CR |= (DAC_CR_EN1 << (16 * (dac_config[line].chan & 0x01)));
}
void dac_poweroff(dac_t line)
@ -118,7 +124,7 @@ void dac_poweroff(dac_t line)
assert(line < DAC_NUMOF);
/* disable corresponding channel */
dev(line)->CR &= ~(1 << (16 * (dac_config[line].chan & 0x01)));
dev(line)->CR &= ~(DAC_CR_EN1 << (16 * (dac_config[line].chan & 0x01)));
/* disable the DAC's clock in case no channel is active anymore */
if (!(dev(line)->CR & EN_MASK)) {