STM32F103C8T6单片机串口1和TIM_CH1产生PWM不能同时工作？请问各位大神这是怎么回事 -

#include <stm32f10x.h>
#include "uart.h"
#include "pwm.h"
int main(void)
{
//uart_init(); //115200
pwm_init();
//printf("Hello STM32!\r\n");
while(1)
{
TIM_SetCompare1(TIM1,50);
}
}

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#include "uart.h"
void uart_init(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//使能端口时钟 TXD RXD GPIO PA10 PA9
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
//使能串口1时钟 APB2
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* 配置RXD引脚 PA10 浮空输入模式 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 配置TXD PA9 复用推挽输出模式 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 115200; //配置波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8位数据位
USART_InitStructure.USART_StopBits = USART_StopBits_1; //1位停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无需硬件流控
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//全双工既可以发送也可以接收
/* 初始化USART1 */
USART_Init(USART1, &USART_InitStructure);
/* 使能串口工作 */
USART_Cmd(USART1, ENABLE);
}
void send_byte(uint8_t byte)
{
USART_SendData(USART1, byte);
/* 等待发送完成 */
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
{
}
}
void send_string(uint8_t *str)
{
while(*str != '\0')
{
send_byte(*str++);
}
}
void send_buf(uint8_t *buf,uint16_t len)
{
uint16_t i;
for(i = 0;i < len;i++)
{
send_byte(buf[i]);
}
}
int fputc(int ch,FILE *f)
{
send_byte(ch);
return(ch);
}

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#include "pwm.h"
void pwm_init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//使能TIM1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* GPIOA 端口时钟 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
//PA8 配置复用推挽输出模式
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 定时器配置产生频率 50HZ-60HZ 100HZ */
TIM_TimeBaseStructure.TIM_Period = 10000/100 - 1; //计数值范围0 - 99
TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1; //72MHZ/7200 = 10 000
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* PWM1 模式配置：TIM1_CH1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //PWM输出使能
TIM_OCInitStructure.TIM_Pulse = 0; //设置比较值比较值决定了占空比值得范围由计数值决定
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
//使能预装载寄存器
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
//使能自动重装载寄存器
TIM_ARRPreloadConfig(TIM1, ENABLE);
/* 使能TIM1计数 */
TIM_Cmd(TIM1, ENABLE);
}

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