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/*******************************************************************************
* 函数名称: DAC_DeInit
* 功能描述: Deinitializes the DAC peripheral registers to their default
* reset values[还原DAC外设寄存器到默认复位值].
* 输入参数: 无.
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void DAC_DeInit(void)
{
/* Enable DAC reset state [使能DAC复位状态]*/
RCC_APB1PeriphResetCmd(RCC_APB1Periph_DAC, ENABLE);
/* Release DAC from reset state [解除DAC复位状态]*/
RCC_APB1PeriphResetCmd(RCC_APB1Periph_DAC, DISABLE);
}
/*******************************************************************************
* 函数名称: DAC_Init
* 功能描述: Initializes the DAC peripheral according to the specified
* parameters in the DAC_InitStruct[依照DAC_InitStruct指定的参数初始化DAC外部设备].
* 输入参数: (1) DAC_Channel: the selected DAC channel[选择DAC通道].
* This parameter can be one of the following values[这个参数可以是下面的值之一]:
* - DAC_Channel_1: DAC Channel1 selected[选择DAC通道1]
* - DAC_Channel_2: DAC Channel2 selected[选择DAC通道2]
* (2) DAC_InitStruct: pointer to a DAC_InitTypeDef structure that
* contains the configuration information for the specified
* DAC channel.[指向包含了指定DAC通道配置信息的DAC_InitTypeDef结构指针]
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void DAC_Init(u32 DAC_Channel, DAC_InitTypeDef* DAC_InitStruct)
{
u32 tmpreg1 = 0, tmpreg2 = 0;
/* Check the DAC parameters [检查DAC参数]*/
assert_param(IS_DAC_TRIGGER(DAC_InitStruct->DAC_Trigger));
assert_param(IS_DAC_GENERATE_WAVE(DAC_InitStruct->DAC_WaveGeneration));
assert_param(IS_DAC_LFSR_UNMASK_TRIANGLE_AMPLITUDE(DAC_InitStruct->DAC_LFSRUnmask_TriangleAmplitude));
assert_param(IS_DAC_OUTPUT_BUFFER_STATE(DAC_InitStruct->DAC_OutputBuffer));
/*---------------------------- DAC CR Configuration --------------------------*/
/* Get the DAC CR value [获得DAC CR的值]*/
tmpreg1 = DAC->CR;
/* Clear BOFFx, TENx, TSELx, WAVEx and MAMPx bits [清BOFFx, TENx, TSELx, WAVEx和MAMPx位]*/
tmpreg1 &= ~(CR_CLEAR_Mask << DAC_Channel);
/* Configure for the selected DAC channel: buffer output, trigger, wave generation,
mask/amplitude for wave generation [配置选择的DAC通道：缓存输出，触发器，波形发生器，波形发生器的时标/振幅]*/
/* Set TSELx and TENx bits according to DAC_Trigger value [依照DAC_Trigger的值设置TSELx和TENx位]*/
/* Set WAVEx bits according to DAC_WaveGeneration value [依照DAC_WaveGeneration的值设置WAVEx位]*/
/* Set MAMPx bits according to DAC_LFSRUnmask_TriangleAmplitude value [依照DAC_LFSRUnmask_TriangleAmplitude的值设置MAMPx位]*/
/* Set BOFFx bit according to DAC_OutputBuffer value [依照DAC_OutputBuffer的值设置BOFFx位]*/
tmpreg2 = (DAC_InitStruct->DAC_Trigger | DAC_InitStruct->DAC_WaveGeneration |
DAC_InitStruct->DAC_LFSRUnmask_TriangleAmplitude | DAC_InitStruct->DAC_OutputBuffer);
/* Calculate CR register value depending on DAC_Channel [根据DAC_Channel计算CR寄存器值]*/
tmpreg1 |= tmpreg2 << DAC_Channel;
/* Write to DAC CR [写DAC CR]*/
DAC->CR = tmpreg1;
}
从二十一篇往后都是ST新器件的功能，原来MXCHIP翻译的固件库说明已经没的参考了，全靠我自己了，所以没有把原文替换掉，而是在后面加了括号。