02初始化UART1
从官网上下载MM32F013x例程，里面有UART普通模式的配置，主要是增加了UART->GCR的TX_TOG和RX_TOG位设置，如下：
void uart_nvic_init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
UART_InitTypeDef UART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphclockCmd(RCC_APB2Periph_UART1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
//UART1 NVIC
NVIC_InitStructure.NVIC_IRQChannel = UART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//Baud rate
UART_Structinit(&UART_InitStructure);
UART_InitStructure.BaudRate = bound;
//The word length is in 8-bit data format.
UART_InitStructure.WordLength = UART_WordLength_8b;
UART_InitStructure.StopBits = UART_StopBits_1;
//No even check bit.
UART_InitStructure.Parity = UART_Parity_No;
//No hardware data flow control.
UART_InitStructure.HWFlowControl = UART_HWFlowControl_None;
UART_InitStructure.Mode = UART_Mode_Rx | UART_Mode_Tx;
UART_Init(UART1, &UART_InitStructure);
UART_ITConfig(UART1,UART_IT_RXIEN,ENABLE);
UART1->GCR |= UART_GCR_TXTOG; //发送取反位
UART1->GCR |= UART_GCR_RXTOG; //接收取反位
UART_Cmd(UART1, ENABLE);
//UART1_TX GPIOA.9
GPIO_StructInit(&GPIO_InitStructure);
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);
//UART1_RX GPIOA.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
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