1. 区分&与&&、什么是短路求值
2. 值<<移动的位数（十六进制下的位操作）
#define ADC_SR_AWD_Pos (0U)
#define ADC_SR_AWD_Msk (0x1UL << ADC_SR_AWD_Pos) /*!< 0x00000001 */
#define ADC_SR_AWD ADC_SR_AWD_Msk /*!<Analog watchdog flag */
#define ADC_SR_EOC_Pos (1U)
#define ADC_SR_EOC_Msk (0x1UL << ADC_SR_EOC_Pos) /*!< 0x00000002 */
#define ADC_SR_EOC ADC_SR_EOC_Msk /*!<End of conversion */
#define ADC_SR_JEOC_Pos (2U)
#define ADC_SR_JEOC_Msk (0x1UL << ADC_SR_JEOC_Pos) /*!< 0x00000004 */
#define ADC_SR_JEOC ADC_SR_JEOC_Msk /*!<Injected channel end of conversion */
#define ADC_SR_JSTRT_Pos (3U)
#define ADC_SR_JSTRT_Msk (0x1UL << ADC_SR_JSTRT_Pos) /*!< 0x00000008 */
#define ADC_SR_JSTRT ADC_SR_JSTRT_Msk /*!<Injected channel Start flag */
#define ADC_SR_STRT_Pos (4U)
#define ADC_SR_STRT_Msk (0x1UL << ADC_SR_STRT_Pos) /*!< 0x00000010 */
#define ADC_SR_STRT ADC_SR_STRT_Msk /*!<Regular channel Start flag */
#define ADC_SR_OVR_Pos (5U)
#define ADC_SR_OVR_Msk (0x1UL << ADC_SR_OVR_Pos) /*!< 0x00000020 */
#define ADC_SR_OVR ADC_SR_OVR_Msk /*!<Overrun flag */
#define ADC_CR1_AWDIE_Pos (6U)
#define ADC_CR1_AWDIE_Msk (0x1UL << ADC_CR1_AWDIE_Pos) /*!< 0x00000040 */
#define ADC_CR1_AWDIE ADC_CR1_AWDIE_Msk /*!<AAnalog Watchdog interrupt enable */
#define ADC_CR1_JEOCIE_Pos (7U)
#define ADC_CR1_JEOCIE_Msk (0x1UL << ADC_CR1_JEOCIE_Pos) /*!< 0x00000080 */
#define ADC_CR1_JEOCIE ADC_CR1_JEOCIE_Msk /*!<Interrupt enable for injected channels */
#define ADC_CR1_SCAN_Pos (8U)
#define ADC_CR1_SCAN_Msk (0x1UL << ADC_CR1_SCAN_Pos) /*!< 0x00000100 */
#define ADC_CR1_SCAN ADC_CR1_SCAN_Msk /*!<Scan mode */
#define ADC_CR1_AWDSGL_Pos (9U)
#define ADC_CR1_AWDSGL_Msk (0x1UL << ADC_CR1_AWDSGL_Pos) /*!< 0x00000200 */
#define ADC_CR1_AWDSGL ADC_CR1_AWDSGL_Msk /*!<Enable the watchdog on a single channel in scan mode */
#define ADC_CR1_JAUTO_Pos (10U)
#define ADC_CR1_JAUTO_Msk (0x1UL << ADC_CR1_JAUTO_Pos) /*!< 0x00000400 */
#define ADC_CR1_JAUTO ADC_CR1_JAUTO_Msk /*!<Automatic injected group conversion */
#define ADC_CR1_DISCEN_Pos (11U)
#define ADC_CR1_DISCEN_Msk (0x1UL << ADC_CR1_DISCEN_Pos) /*!< 0x00000800 */
#define ADC_CR1_DISCEN ADC_CR1_DISCEN_Msk /*!<Discontinuous mode on regular channels */
#define ADC_CR1_JDISCEN_Pos (12U)
#define ADC_CR1_JDISCEN_Msk (0x1UL << ADC_CR1_JDISCEN_Pos) /*!< 0x00001000 */
3. a&(a-1)的作用
求一个数转换为二进制后中1的个数
标签：SR,汇总,问题,ADC,求值,一些,AWD,define From： https://www.cnblogs.com/lichangyi/p/18239754