串口调试输入字符改变pwm参数

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串口调试输入字符改变pwm参数，控制舵机为什么没有反应，求大神解惑

#include "usart.h"
void usart_Init()
{
        GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
       
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);//GPIO¶Ë¿ú
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);//¸′óÃ
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//′®¿ú
       
        GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;//éèÖÃËùÂê     tx
        GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//Ñ¡Ôñ1ü½&#197A9
        GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//Ñ¡Ôñ¸′óÃíÆíìêä3öÄ￡ê½
        GPIO_Init(GPIOA,&GPIO_InitStructure);//ÅäÖÃ1ü½Åíaéè￡¬¶Ô½á11ìå3õê¼»ˉ
          
        GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//Ñ¡Ôñ1ü½&#197A10         rx
        GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;//Ñ¡¸¡¿Õêäèë
        GPIO_Init(GPIOA,&GPIO_InitStructure);//ÅäÖÃ1ü½Åíaéè￡¬¶Ô½á11ìå3õê¼»ˉ
       
        USART_InitStructure.USART_BaudRate = 9600;//2¨ìØÂêéèÖÃ
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;//êy¾Y3¤¶è  96n81
  USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ö¡½áÎ2í￡Ö1λ
  USART_InitStructure.USART_Parity = USART_Parity_No;//D￡ÑéÄ￡ê½￡¬ÎTD￡Ñé
  USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None;
        //ó2¼tá÷¿ØÖÆÄ￡ê½ê1Äüê§Äü
  USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;//·￠Ëí½óêÕÄ￡ê½ê1Äü(è«Ë«1¤)
  /*USART_InitStructure.USART_Clock = USART_Clock_Disable;
  USART_InitStructure.USART_CPOL = USART_CPOL_High;
  USART_InitStructure.USART_CPHA = USART_CPHA_1Edge;
  USART_InitStructure.USART_LastBit = USART_LastBit_Enable;*/
  USART_Init(USART1, &USART_InitStructure);
       
        USART_Cmd(USART1, ENABLE);//′®¿úí¨DÅê1Äü
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//′®¿ú½óêÕÖD¶Ïê1Äü
  USART_ClearFlag(USART1, USART_FLAG_TC);//Çå¿Õ ·￠Ëííê3é±ê־λ
       
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//·Ö×éoˉêy
        NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;//′ò¿aUSART1μÄ諾ÖÖD¶Ï
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//ÇàÕ¼óÅÏ輶0
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;//Ïìó|óÅÏ輶0
        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
        NVIC_Init(&NVIC_InitStructure);       
}