//=============================================================================
int uart_getc(uart_t* const uart)
{
    dma_t* const dma = &uart->dma.rx;

    if (dma->size - dma->sfr->CNDTR != dma->idx)
    {
        int x = dma->buf[dma->idx];

        if (++dma->idx >= dma->size)
        {
            dma->idx = 0;
        }

        return (x);
    }

    return (-1);
}

uint8_t mybuf[256];
void WiFi_Uart_DMA_Rx_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;

/* USART1 RX DMA1 Channe5 */
DMA_DeInit(DMA1_Channel5);
DMA_StructInit(&DMA_InitStructure);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART1->DR);//0x40013804;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)mybuf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = sizeof(mybuf);
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_MemoryInc = ENABLE;
DMA_InitStructure.DMA_PeripheralInc = DISABLE;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);

DMA_ITConfig(DMA1_Channel5, DMA_IT_HT | DMA_IT_TC | DMA_IT_TE, DISABLE);

USART_DMACmd(USART1, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE);

DMA_Cmd(DMA1_Channel5, ENABLE);
}

void WiFi_UartInit(uint32_t baudrate)
//void InitUart1(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

Uart1BufInit();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; // PA.09 USART1.TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; // PA.10 USART1.RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);

// /* Configure the NVIC Preemption Priority Bits */
// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
//
// /* Enable the USARTy Interrupt */
// NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);

USART_InitStructure.USART_BaudRate = baudrate;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

USART_Init(USART1, &USART_InitStructure);

// /* Enable USARTy Receive and Transmit interrupts */
// USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

USART_Cmd(USART1, ENABLE);

WiFi_Uart_DMA_Rx_Config();
}