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USART in stm32 doesn't work for baud-rate upper than 115200

Parisa Mohamadi

Hello
Here is my code

        USART_InitTypeDef USAR;
        GPIO_InitTypeDef GPIOStruc;

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO,ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
        GPIO_PinRemapConfig(GPIO_Remap_USART1,ENABLE);

        GPIOStruc.GPIO_Mode=GPIO_Mode_AF_PP ;
        GPIOStruc.GPIO_Speed=GPIO_Speed_50MHz;
        GPIOStruc.GPIO_Pin=GPIO_Pin_6;
        GPIO_Init(GPIOB,&GPIOStruc);

        GPIOStruc.GPIO_Mode=GPIO_Mode_IN_FLOATING ;
        GPIOStruc.GPIO_Pin=GPIO_Pin_7;
        GPIO_Init(GPIOB,&GPIOStruc);

        USAR.USART_BaudRate=115200;
        USAR.USART_StopBits=USART_StopBits_1;
        USAR.USART_WordLength=USART_WordLength_8b;
        USAR.USART_Parity=USART_Parity_No ;
        USAR.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
        USAR.USART_Mode=USART_Mode_Rx | USART_Mode_Tx;
        USART_Init(USART1,&USAR);
        USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
        NVIC_EnableIRQ(USART1_IRQn);
        USART_Cmd(USART1,ENABLE);

It works fine but when I change baud-rate upper than 115200 for example to 460800 and 2250000 it doesn't work.I'm using stm32f10x