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uart4.c
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uart4.c
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#include "stdarg.h"
#include "stdio.h"
#include "string.h"
#include "uart4.h"
u8 UART4_TX_BUF[UART4_MAX_SEND_LEN];
u8 UART4_RX_BUF[UART4_MAX_RECV_LEN];
//vu16 UART4_RX_STA=0;
//u8 gps_uart_en = 0;
//u8 gps_tim_cnt = 0;
u8 gps_uart_flag = 0;
u8 GPS_DATA[UART4_MAX_RECV_LEN+1];
void Init_Uart4(u32 baudrate)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
USART_DeInit(UART4);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource1,GPIO_AF_UART4);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPIO_AF_UART4);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA,&GPIO_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
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(UART4, &USART_InitStructure);
//USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);
USART_ITConfig(UART4, USART_IT_IDLE, ENABLE);
USART_Cmd(UART4, ENABLE);
Init_Uart4_RxDMA();
}
void Init_Uart4_RxDMA()
{
// NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* Enable DMA clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
/* Reset DMA Stream registers (for debug purpose) */
DMA_DeInit(DMA1_Stream2);
/* Configure DMA Stream */
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)& UART4->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)UART4_RX_BUF;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = (uint32_t)UART4_MAX_RECV_LEN;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//DMA_Mode_Circular; //DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream2, &DMA_InitStructure);
/* Enable DMA Stream Transfer Complete interrupt */
// DMA_ITConfig(DMA1_Stream2, DMA_IT_TC , ENABLE); //DMA_IT_HT
// DMA_ClearITPendingBit(DMA1_Stream2, DMA_IT_TCIF2);
USART_DMACmd(UART4, USART_DMAReq_Rx, ENABLE);
/* DMA Stream enable */
DMA_Cmd(DMA1_Stream2, ENABLE);
/* Enable the DMA Stream IRQ Channel */
// NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream2_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);
}
void DMA1_Stream2_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_Stream2,DMA_IT_TCIF2))
{
DMA_ClearITPendingBit(DMA1_Stream2, DMA_IT_TCIF2);
// DMA1_Stream2->NDTR = UART4_MAX_RECV_LEN;
// DMA_Cmd(DMA1_Stream2, ENABLE);
USART_ITConfig(UART4, USART_IT_IDLE, ENABLE);
//Init_Uart4_RxDMA();
}
}
void UART4_IRQHandler(void)
{
// if(USART_GetITStatus(UART4, USART_IT_RXNE) != RESET)
// {
// USART_ClearFlag(UART4, USART_IT_RXNE);
// USART_ClearFlag(UART4, USART_IT_IDLE);
// USART_ITConfig(UART4, USART_IT_IDLE, ENABLE);
// USART_ITConfig(UART4, USART_IT_RXNE, DISABLE);
//
//// DMA_ClearFlag(DMA1_Stream2,DMA_IT_TCIF2);
//// DMA1_Stream2->NDTR = UART4_MAX_RECV_LEN;
//// DMA_Cmd(DMA1_Stream2, ENABLE);
// Init_Uart4_RxDMA();
// USART_Cmd(UART4, ENABLE);
// }
if(USART_GetITStatus(UART4, USART_IT_IDLE) != RESET)
{
u32 len;
u32 i;
DMA_Cmd(DMA1_Stream2, DISABLE);
len = UART4_MAX_RECV_LEN - DMA_GetCurrDataCounter(DMA1_Stream2);
if(len > 0)
{
for(i=0;i<len;i++) GPS_DATA[i] = UART4_RX_BUF[i];
GPS_DATA[i] = 0;
gps_uart_flag = 1;
}
DMA_ClearFlag(DMA1_Stream2,DMA_IT_TCIF2);
DMA1_Stream2->NDTR = UART4_MAX_RECV_LEN;
DMA_Cmd(DMA1_Stream2, ENABLE);
//USART1->DR = '#';
i = UART4->SR;
i = UART4->DR; //ÇåIDLE±êÖ¾
}
}
void u4_printf(char* fmt,...)
{
u16 i,j;
va_list ap;
va_start(ap,fmt);
vsprintf((char*)UART4_TX_BUF,fmt,ap);
va_end(ap);
i=strlen((const char*)UART4_TX_BUF);
for(j=0;j<i;j++)
{
while(USART_GetFlagStatus(UART4,USART_FLAG_TC)==RESET);
USART_SendData(UART4,UART4_TX_BUF[j]);
}
}