when enable idle interrupt uart does not work

[Jython]

HI, ALL AND JOEL!
i am debugging the stm32 uart, found that the idle interrupt will effect
the RX
have cleared the idle flag by pragma
but now i can not receive uart data, i don't know what's the error

uint32_t *USART2_SR = (uint32_t *)0x40004400;
uint32_t *USART2_DR = (uint32_t *)0x40004404;

#pragma GCC push_options
#pragma GCC optimize ("O0")
rtems_isr USART2_handler(rtems_vector_number vector)
{

    uint32_t temp = temp;
    uint32_t SR = *USART2_SR;
    if((*USART2_SR) & (1<<5))
    {

        //printk("into int\n");
        if(uart2_index < 100)
            uart2_buf[uart2_index++] = (uint8_t)(*USART2_DR)&0xff;
        else
            temp = *USART2_DR;
        //printk("%02X  ", uart2_buf[uart2_index - 1]);




    }

    if((*USART2_SR) & (1<<4))  // idle
    {
        //printk("idle ");

        temp = (*USART2_SR);
        temp = (*USART2_DR);
        //temp = temp;

        uart2_rev_flag = 1;
        //printk("fla %08X", *USART2_SR);

    }

    if((*USART2_SR) & (1<<3))
    {
        //int temp = (*USART2_DR)&0xff;
        temp = *USART2_SR;
        temp = *USART2_DR;
    }

    //temp = (*USART2_SR);
    //temp = (*USART2_DR);

}
#pragma GCC pop_options


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https://lists.rtems.org/pipermail/users/2019-April/033147.html
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