usart.c

卫星接受机控制卫星和LCD显示

//usart.c  for lc ODU
#include <stdio.h>
#include "usart.h"
#include "AT91SAM7S128.h"
#include "crc.h"
#include "vars.h"
#include "cmdrun.h"
#include <stdlib.h>

#define AT91C_MASTER_CLOCK 48000000


extern void Delay (unsigned long a);

unsigned char rx_buf[256]; //接收缓冲区
unsigned char tx_buf[256]; //发送缓冲区
unsigned int hd_flag=0;//接收数据阶段标志
unsigned int rx_index,rx_len,tx_index,tx_len;  //接收、发送数组下标及长度
extern unsigned long Alive_counter;//发送Alive消息计时器


AT91PS_PIO    u_pPio    = AT91C_BASE_PIOA;
AT91PS_PMC    u_pPMC    = AT91C_BASE_PMC;
AT91PS_USART  u_pUSART0 = AT91C_BASE_US0;
AT91PS_USART  u_pUSART1 = AT91C_BASE_US1;
AT91PS_MC     u_pMC     = AT91C_BASE_MC;
AT91PS_AIC    u_pAic    = AT91C_BASE_AIC;

void InitUSART0() { // 初始化 UART0
  u_pPio->PIO_PDR = BIT5 | BIT6 | BIT21 | BIT22;
  u_pPio->PIO_ASR = BIT5 | BIT6 | BIT21 | BIT22;
  u_pPio->PIO_BSR = 0;
  u_pPMC->PMC_PCER = 1<<AT91C_ID_US0;    // 允许 UART0 时钟
  u_pUSART0->US_BRGR = 240;              // 设置波特率因子 ((18.432MHz*4)/(19200x16))
  u_pUSART0->US_TTGR = 0;
  u_pUSART0->US_MR = 0x08c0;             // 设置UART0工作方式：9600波特率。8数据，1位停止位，无校验
  u_pUSART0->US_PTCR = AT91C_PDC_TXTEN | AT91C_PDC_RXTEN;  // 允许RX和TX进行PDC传送请求
  u_pUSART0->US_RPR = (unsigned int)recv_dma;//PDC_RPR 的值为recv_dma的地址
  u_pUSART0->US_RNPR =(unsigned int)recv_dma;;
  u_pUSART0->US_TPR = (unsigned int)send_dma;//PDC_TPR 的值为send_dma的地址
  //u_pUSART0->US_TNPR = US0T_DMA_ADDR;
  u_pUSART0->US_RCR = MAX_RECV_BUF;
  u_pUSART0->US_RNCR = MAX_RECV_BUF;
  u_pUSART0->US_TCR = 0;
  u_pUSART0->US_CR = 0x50;               // 允许UART0
  //recv_point=MAX_RECV_BUF;
  send_point=0;
  tx_wr_pt=0;
  rx_rd_pt=0;
  /*因为全局变量在定义时已经分配了一个固定的内存地址，所以无法再更改其地址*/
  //send_dma=(unsigned char *)tbuf_addr;//US0T_DMA_ADDR;//(u_pUSART0->US_TPR);   
  //recv_dma=(unsigned char *)rbuf_addr;//US0R_DMA_ADDR;//(u_pUSART0->US_RPR);
}
/*
unsigned int write_char_USART0(unsigned char ch) {  // 向UART0写入字符数据
  if (!(u_pUSART0->US_CSR&AT91C_US_TXRDY)==1) return 0;
  u_pUSART0->US_THR = ((ch & 0x1FF));
  return 1;
}

unsigned char read_char_USART0(void) {      // 从UART0读取字符数据
  if((u_pUSART0->US_CSR&AT91C_US_RXRDY)==1)
  {recv_dma[MAX_RECV_BUF-recv_point]=((u_pUSART0->US_RHR) & 0x0FF);
   if(recv_point>0) recv_point--;
   else recv_point=MAX_RECV_BUF;
  }
  return 0;
}

unsigned char read_char_USART0_nonstop(void) {  // 从UART0读取字符数据，无停止位
  if((u_pUSART0->US_CSR&AT91C_US_RXRDY)==1)
    return((u_pUSART0->US_RHR) & 0x1FF);
  else return 0;
}

void write_str_USART0(unsigned char* buff) {  // 向UART0写入字符串数据  for debug
  unsigned int i = 0x0;
  while(buff[i] != '\0') {
    write_char_USART0(buff[i]);
    i++;
  }
}
*/
unsigned char send_triger;  //for debug^^^^^^^^^^^^^^^^^for debug
void send_msg_USART0(){

  if(tx_wr_pt!=send_point) {
    Alive_counter=0;
      
    if(send_point<tx_wr_pt){
      u_pUSART0->US_TPR=send_point+(unsigned int)send_dma;
      u_pUSART0->US_TCR=tx_wr_pt-send_point;
      send_point=tx_wr_pt;
      send_triger=1;
    }
    else
    { 
      u_pUSART0->US_TPR=send_point+(unsigned int)send_dma;
      u_pUSART0->US_TCR=MAX_SEND_BUF-send_point;
      send_point=0;
      send_triger=1;
    }
  }
}

/*
void ClearTerminal(void) {
  write_char_USART0(0x0d);                   // 回车
  write_char_USART0(0x0a);                   // 换行
}
*/
/*将ACK帧写入PDA内存*/
void send_ack()
{ unsigned char datalink_buf[5];
   datalink_buf[0]=0x7e;
   datalink_buf[1]=0xff;
   datalink_buf[2]=0x00;
   datalink_buf[3]=0xff;
   datalink_buf[4]=0x7e;
   //write_frame_USART0(datalink_buf,5);
 for(int j=0;j<5;j++)
  {
    send_dma[tx_wr_pt++]=datalink_buf[j];
    if(tx_wr_pt>=MAX_SEND_BUF) tx_wr_pt=0;
    //for debug^^^^^^^^^^
    printf("%x ",datalink_buf[j]);
    //if(write_char_USART0(datalink_buf[j])==0) j--;   /*for debuging^^^^^^^^^^^^^^^^^^^for debug*/
  }
}

/*将需要传输的信息打包，组成一个应用层信息帧*/
void msg_pack(unsigned char type,unsigned char id,unsigned char ack,unsigned char exinfor)  //application layer
{
  unsigned int i,j,plen;
  unsigned char tmp_buf[32];
  
  //memset(tmp_buf,0,1);
  
  tmp_buf[0]=type;
  tmp_buf[1]=id;
  tmp_buf[2]=ack;
  plen=3;
  //for(i=0;i<plen;i++)
    //tmp_buf[i+2]=payload[i];
  if(ack!=0) 
  {  load_msg(tmp_buf,3);   //数据链路层打包,并写入待发送存储区，非正确应答
     return;
  }
  
  /*如果ack＝0执行以下代码*/
  if(type==0x00){/*spontaneous message*/
    plen=2;
    switch(id){
    case 0x01://alarm
      tmp_buf[plen++]=v_odu_alarm[0] | v_alarm_sim[0];
      tmp_buf[plen++]=v_odu_alarm[1] | v_alarm_sim[1];
      break;
    case 0x02://configuration
      for(i=0;i<MAX_CONF_NUM;i++)
      {
        if(exinfor==v_cfg_data[i].no)
          break;
      }
      if(i<MAX_CONF_NUM) 
      {  ack=0;
         for(j=0;j<v_cfg_data[i].len;j++)
           tmp_buf[plen++]=v_cfg_data[i].value[j];
      }
      else return;
      break;
    case 0x05://measurement
      tmp_buf[plen++]=v_tx_power&0x0ff;
      tmp_buf[plen++]=(v_tx_power>>8)&0x0ff;
      if(exinfor==0x01){
        plen=5;
      }
      else if(exinfor==0xff){
        tmp_buf[plen++]=v_rx_power&0x0ff;
        tmp_buf[plen++]=(v_rx_power>>8)&0x0ff;
        tmp_buf[plen++]=v_temp_value&0x0ff;
        tmp_buf[plen++]=(v_temp_value>>8)&0x0ff;
      }
      else 
      {
       return;
      }
      break;
    case 0x07://reset
      tmp_buf[plen++]=v_reset;
      break;
    case 0x08://software version
      for(i=0;i<2;i++)
      {
         tmp_buf[plen++]=v_soft_ver[i].active_image;
         tmp_buf[plen++]=v_soft_ver[i].version/100+0x30;
         tmp_buf[plen++]=(v_soft_ver[i].version%100)/10+0x30;
         tmp_buf[plen++]=v_soft_ver[i].version%10+0x30;
         tmp_buf[plen++]=v_soft_ver[i].flag;
         tmp_buf[plen++]=v_soft_ver[i].day/10+0x30;
         tmp_buf[plen++]=v_soft_ver[i].day%10+0x30;
         tmp_buf[plen++]=v_soft_ver[i].month/10+0x30;
         tmp_buf[plen++]=v_soft_ver[i].month%10+0x30;
         tmp_buf[plen++]=(v_soft_ver[i].year%100)/10+0x30;
         tmp_buf[plen++]=v_soft_ver[i].year%10+0x30;
      }
      break;
    /*case 0x09://flash access--------adding on 07-0924
      break;*/
    case 0x20://alive message
      tmp_buf[plen++]=v_counter;
      break;
    case 0x21://RxPower
      tmp_buf[plen++]=v_rx_power;
      break;
    case 0x22://TxPower
      tmp_buf[plen++]=v_tx_power;
      break;
    /*case 0x24://RpsControl
      break;*/
    case 0x25://RpsAlarm
      tmp_buf[plen++]=v_rpsalarm;
      break;
    /*case 0x26://ODU control
      break;*/
    default:
      break;
    }
  }
  else if(type==0x01){//response message
    switch(id){
    case 0x01://alarm
      tmp_buf[plen++]=v_odu_alarm[0] | v_alarm_sim[0];
      tmp_buf[plen++]=v_odu_alarm[1] | v_alarm_sim[1];
      break;
    case 0x02://configuration
      for(i=0;i<MAX_CONF_NUM;i++)
      {
        if(exinfor==v_cfg_data[i].no)
          break;
      }
      if(i<MAX_CONF_NUM) 
      {  ack=0;
         for(j=0;j<(v_cfg_data[i].len);j++)
           tmp_buf[plen++]=v_cfg_data[i].value[j];
      }
      else ack=0x87;//--------------------未定义变量？？？？？？？？？？？
      tmp_buf[2]=ack;
      break;
    case 0x03://filetransfer/*已经在ftrans_pro 函数中处理了*/
      tmp_buf[2]=ack;
      break;
    case 0x05://measurement
      tmp_buf[plen++]=v_tx_power&0x0ff;
      tmp_buf[plen++]=(v_tx_power>>8)&0x0ff;
      if(exinfor==0x01){
        plen=5;
      }
      else if(exinfor==0xff){
        tmp_buf[plen++]=v_rx_power&0x0ff;
        tmp_buf[plen++]=(v_rx_power>>8)&0x0ff;
        tmp_buf[plen++]=v_temp_value&0x0ff;
        tmp_buf[plen++]=(v_temp_value>>8)&0x0ff;
      }
      else 
      {
        ack=ACK_VALINVALID;
        tmp_buf[2]=ack;
        plen=3;
      }
      break;
    case 0x07://reset
      tmp_buf[plen++]=v_reset;