库函数TIM_UpdateRequestConfig用于设置寄存器，有两个参数：
对于这个库函数参数的定义，说明一塌糊涂。
函数的原型如下：
" h$ l" f* j& S7 F4 ?6 C手册原型：
; H7 g1 A' A+ f& z9 H, lvoid TIM_UpdateRequestConfig(TIM_TypeDef* TIMx, uint16_t TIM_UpdateSource)
{
! e5 k  h4 b" i5 h1 Y" }# H  /* Check the parameters */
  assert_param(IS_TIM_ALL_PERIPH(TIMx));
$ ^/ |, q# x1 `' Y* @9 @* G3 E5 R  assert_param(IS_TIM_UPDATE_SOURCE(TIM_UpdateSource));
  if (TIM_UpdateSource != TIM_UpdateSource_Global)
  {
    /* Set the URS Bit */
    TIMx->CR1 |= TIM_CR1_URS;
  }
0 w5 o) U" `/ h( t# ^# R5 Q  else
  {
    /* Reset the URS Bit */
    TIMx->CR1 &= (uint16_t)~((uint16_t)TIM_CR1_URS);
  }
6 W- j) X- Q' X3 q% |* h}
库函数原型：
" i# B1 a# |- U; ?  r9 Vvoid TIM_UpdateRequestConfig(TIM_TypeDef* TIMx, uint16_t TIM_UpdateSource)
- X' Q, U9 Y/ [. h/ Y8 v{
  /* Check the parameters */
  assert_param(IS_TIM_ALL_PERIPH(TIMx));
  assert_param(IS_TIM_UPDATE_SOURCE(TIM_UpdateSource));
  if (TIM_UpdateSource != TIM_UpdateSource_Global)
+ h# v6 ^5 j3 d  {
    /* Set the URS Bit */
& ?% O2 ?! w. A. P0 S    TIMx->CR1 |= TIM_CR1_URS;
  }
  else
  {
    /* Reset the URS Bit */
# j: o6 C8 Y$ @    TIMx->CR1 &= (uint16_t)~((uint16_t)TIM_CR1_URS);
  }
}
3 [: ^' w3 y1 F各位看官，至于她什么地方一塌糊涂，自己研究。
我说一下，如何正确使用这个函数。
1.手册中的参数两个参数解释，反了（stm32f10x_stdperiph_lib_um.chm）：
7 E7 V! m/ [  C& B* ?2 z

   
0 Z" w3 z8 l0 T, a1 T
• TIM_UpdateSource_Regular: Source of update is the counter overflow/underflow or the setting of UG bit, or an update generation through the slave mode controller.   
  / Y/ A, t* F7 E3 g
• TIM_UpdateSource_Global: Source of update is counter overflow/underflow
  + C' j* @* Y5 R  e8 @  E6 V/ c4 g

 
1 S( Y3 \4 ^, K4 i" ~2.库函数定义处的说明同上一样反了。stm32f10x_time.c 第2109行。/**
3 q0 J0 [' ~- D' t, b  * @brief  Configures the TIMx Update Request Interrupt source.
6 T" I3 S% b2 k9 m& v  \- T  * @param  TIMx: where x can be 1 to 17 to select the TIM peripheral.
8 f: Y& z6 H2 `/ X3 d) N  * @param  TIM_UpdateSource: specifies the Update source.
  *   This parameter can be one of the following values:
  *     @arg TIM_UpdateSource_Regular: Source of update is the counter overflow/underflow
                                       or the setting of UG bit, or an update generation
                                       through the slave mode controller.
  *     @arg TIM_UpdateSource_Global: Source of update is counter overflow/underflow.
  * @retval None
  */3.参数宏定义的说明正确；stm32f10x_time.h 第0806行。#define TIM_UpdateSource_Global            ((uint16_t)0x0000) /*!< Source of update is the counter overflow/underflow
                                                                   or the setting of UG bit, or an update generation
                                                                   through the slave mode controller. */
, B0 V: ]7 s: N8 g# J) q#define TIM_UpdateSource_Regular           ((uint16_t)0x0001) /*!< Source of update is counter overflow/underflow. */ 

谢谢楼主提出的意见。

不错哦，楼主很细心！

楼主研究的很深啊

涨姿势，谢谢楼主！

楼主说的没错，库函数是解释错误了，在头文件中是正确的，但是行数应该是0860行【3.参数宏定义的说明正确；stm32f10x_time.h 第0806行。 】，我的库文件是3.5.0