//DMA---USART1传输
void DMA1_USART1_SEND(u32 SendBuff,u16 len)
{
MYDMA_Config(DMA1_Channel4,(u32)&USART1->DR,(u32)SendBuff,len);//DMA1通道4,外设为串口1,存储器为SendBuff,长度len.
USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
MYDMA_Enable(DMA1_Channel4);
while(DMA_GetFlagStatus(DMA1_FLAG_TC4) != SET);
DMA_ClearFlag(DMA1_FLAG_TC4); //清除发送完成标志
}
/*
* 函数名：USART2_Config
* 描述 ：USART2 GPIO 配置,工作模式配置
* 输入 ：无
* 输出 : 无
* 调用 ：外部调用
*/
void USART2_Config( void )
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* config USART2 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
/* USART2 GPIO config */
/* Configure USART2 Tx (PA.02) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART2 Rx (PA.03) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART2 mode config */
USART_InitStructure.USART_BaudRate = 115200;
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(USART2, &USART_InitStructure);
/* 使能串口2接收中断 */
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
/* 使能串口2总线空闲中断 */
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
USART_Cmd(USART2, ENABLE);
SetUART2_NVIC_ISENABLE(1);
USART2ReceiveHandler = ReceiveUSART2WifiCmdDelegate;
MYDMA_Config(DMA1_Channel7,(u32)&USART2->DR,(u32)UART2_DMA_SendBuff,UART_SEND_DMA_BUF_LENTH);
}
/**
* @brief UART4 GPIO 配置,工作模式配置。115200 8-N-1
* @param 无
* @retval 无
*/
void UART4_Config(uint32_t BaudRate)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* config UART4 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);
/* UART4 GPIO config */
/* Configure UART4 Tx (PC.10) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure UART4 Rx (PC.11) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* UART4 mode config */
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(UART4, &USART_InitStructure);
/* 使能串口4接收中断 */
USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);
USART_Cmd(UART4, ENABLE);
UART4_NVIC_Configuration(ENABLE);
USART_DMACmd(UART4,USART_DMAReq_Tx,ENABLE);
MYDMA_Config(UART4_TX_DMA_Channel,(u32)&UART4->DR,(u32)UART4_DMA_SendBuff,ENABLE,UART4_SEND_DMA_BUF_LENTH);
NVIC_IRQChannel_Configuration_Set(DMA2_Channel4_5_IRQn, 3, 3, ENABLE);
DMA_ITConfig(UART4_TX_DMA_Channel,DMA_IT_TC,ENABLE);
}
int main(void)
{
u16 i;
u8 t=0;
float pro=0; //进度
delay_init(); //延时函数初始化
uart_init(9600); //串口初始化为9600
LED_Init(); //初始化与LED连接的硬件接口
LCD_Init(); //初始化LCD
KEY_Init(); //按键初始化
MYDMA_Config(DMA1_Channel4,(u32)&USART1->DR,(u32)SendBuff,(TEXT_LENTH+2)*100);//DMA1通道4,外设为串口1,存储器为SendBuff,长(TEXT_LENTH+2)*100.
POINT_COLOR=RED;//设置字体为红色
LCD_ShowString(60,50,200,16,16,"Mini STM32");
LCD_ShowString(60,70,200,16,16,"DMA TEST");
LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(60,110,200,16,16,"2014/3/9");
LCD_ShowString(60,130,200,16,16,"KEY0:Start");
//显示提示信息
for(i=0;i<(TEXT_LENTH+2)*100;i++)//填充ASCII字符集数据
{
if(t>=TEXT_LENTH)//加入换行符
{
SendBuff[i++]=0x0d;
SendBuff[i]=0x0a;
t=0;
}else SendBuff[i]=TEXT_TO_SEND[t++];//复制TEXT_TO_SEND语句
}
POINT_COLOR=BLUE;//设置字体为蓝色
i=0;
while(1)
{
t=KEY_Scan(0);
if(t==KEY0_PRES)//KEY0按下
{
LCD_ShowString(60,150,200,16,16,"Start Transimit....");
LCD_ShowString(60,170,200,16,16," %");//显示百分号
printf("\r\nDMA DATA:\r\n ");
USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE); //????1?DMA??
MYDMA_Enable(DMA1_Channel4);//开始一次DMA传输！
//等待DMA传输完成，此时我们来做另外一些事，点灯
//实际应用中，传输数据期间，可以执行另外的任务
while(1)
{
if(DMA_GetFlagStatus(DMA1_FLAG_TC4)!=RESET)//等待通道4传输完成
{
DMA_ClearFlag(DMA1_FLAG_TC4);//清除通道4传输完成标志
break;
}
pro=DMA_GetCurrDataCounter(DMA1_Channel4);//得到当前还剩余多少个数据
pro=1-pro/((TEXT_LENTH+2)*100);//得到百分比
pro*=100; //扩大100倍
LCD_ShowNum(60,170,pro,3,16);
}
LCD_ShowNum(60,170,100,3,16);//显示100%
LCD_ShowString(60,150,200,16,16,"Transimit Finished!");//提示传送完成
}
i++;
delay_ms(10);
if(i==20)
{
LED0=!LED0;//提示系统正在运行
i=0;
}
}
}