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STM32: analog_out: Enable Buffer and switch 

ADC1 channel2 and ADC2 of few targets only have an output switch and no
buffer. This switch needs to be enabled, and also the buffer can be enabled
in order to reduce the output impedance on output, and to drive external
loads directly without having to add an external operational amplifier.
pull/4529/head
Laurent MEUNIER 2017-06-12 12:47:11 +02:00
parent cdd581b244
commit b51d676dc0
1 changed files with 9 additions and 2 deletions
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11
targets/TARGET_STM/TARGET_STM32F3/analogout_api.c
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@ -87,8 +87,15 @@ void analogout_init(dac_t *obj, PinName pin) {
obj->handle.Instance = (DAC_TypeDef *)(obj->dac); obj->handle.Instance = (DAC_TypeDef *)(obj->dac);
sConfig.DAC_Trigger = DAC_TRIGGER_NONE; sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE; /* Enable both Buffer and Switch in the configuration,
* letting HAL layer in charge of selecting either one
* or the other depending on the actual DAC instance and
* channel being configured.
*/
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
#if defined(DAC_OUTPUTSWITCH_ENABLE)
sConfig.DAC_OutputSwitch = DAC_OUTPUTSWITCH_ENABLE;
#endif
if (pin == PA_4) { if (pin == PA_4) {
pa4_used = 1; pa4_used = 1;