[英]VREF Output on STM32L0
I have an STM32L051 and want to drive an external DAC (SPI). 我有一个STM32L051,想驱动一个外部DAC(SPI)。
For that I would like to use the feature, mentioned in the manual , to output the internal reference voltage to the PB1 pin of the STM32. 为此,我想使用手册中提到的功能将内部参考电压输出到STM32的PB1引脚。
I use the STM32Cube HAL as a basis. 我使用STM32Cube HAL作为基础。 However the examples of using the VREF are limited to internal use for ADCs and comparators.
但是,使用VREF的示例仅限于ADC和比较器内部使用。
If I understand correctly, I can use the CFGR3 register to both enable the VREF as well as connect it to the PB1. 如果我理解正确,我可以使用CFGR3寄存器来使能VREF并将其连接到PB1。 Using the Cube drivers, I can use the
HAL_SYSCFG_VREFINT_OutputSelect(SYSCFG_VREFINT_OUT_PB1)
function, but to enable it, I should use either HAL_ADCEx_EnableVREFINT()
or HAL_COMPEx_EnableVREFINT()
. 使用多维数据集驱动程序,我可以使用
HAL_SYSCFG_VREFINT_OutputSelect(SYSCFG_VREFINT_OUT_PB1)
函数,但是要启用它,我应该使用HAL_ADCEx_EnableVREFINT()
或HAL_COMPEx_EnableVREFINT()
。 The manual information on SEL_VREF_OUT
indicates that ENBUF_VREFINT_ADC
must be set. SEL_VREF_OUT
上的手册信息指示必须设置ENBUF_VREFINT_ADC
。
Furthermore no mention is made about the configuration of the pin itself. 此外,未提及销本身的构造。 Should I simply declare it as a DAC Pin?
我应该简单地将其声明为DAC引脚吗? An ADC Pin?
ADC引脚?
It is as simple as 就这么简单
if ( HALD_ADCEx_EnableVREFINT() != HAL_OK )
{
Error_Handling();
}
HAL_SYSCFG_VREFINT_OutputSelect(SYSCFG_VREFINT_OUT_PB1);
And I can see the 1.22 V on the PB1 output. 我可以在PB1输出上看到1.22V。
It does not require further pin (GPIO) configuration. 它不需要进一步的引脚(GPIO)配置。
I had some issues with the board from out electronic dept. 我在电子部门的董事会中遇到了一些问题。 and thus switched to the STM32L053-Discovery board.
从而切换到STM32L053-发现板。 The above solution did not work, and I kept seeing 0V on PB1 (or PB0).
上面的解决方案不起作用,我一直在PB1(或PB0)上看到0V。
I assumed that was due to some configuration missing. 我认为那是由于缺少一些配置。 However, after some further tests, I actually found that on that Discovery board, both PB1 and PB0 are reserved for a sensor.
但是,经过一些进一步的测试,我实际上发现在该发现板上,PB1和PB0都保留用于传感器。 By closing the SB23 bridge, I could use PB1 back to the GPIO, and thus see the reference voltage on the pin.
通过关闭SB23桥接器,我可以将PB1使用回GPIO,从而查看引脚上的参考电压。
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