/****************************************************************************
 **           
 **     ERC-RF2401無線收發模塊驅動程序
 **     
 **     用戶須知：
 **         該驅動程序為傻瓜版本，無需對模塊過多了解，使用簡單
 **         用戶唯一需要的就是對實際的IO管腳重新定義
 **         原驅動開發使用CPU類型為 AVR ATmega48，IDE環境為IAR
 **         用戶使用接口函數只有三個：
 **         nRF2401AInitializtion() nRF2401AScanf() nRF2401APrintf()
 **         模式切換全部由驅動內部軟件處理
 **         更多代碼實例參照RF2401-FE模塊開發手冊
 **         http://www.hzfeidi.com.cn
 **     
 **                         杭州ERC實驗室 參上
 ***************************************************************************/

#include "nRF2401A_pub.h"


/******************************************基本函數********************************************/

/*8bit寫入*/
void nRF2401AWrite8Bit(unsigned char byte)
{
  unsigned char temp;
  
  nRF2401A_WRITE_DATA();
  for(temp=8;temp>0;temp--)
  {  
    nRF2401A_DATA = (byte&0x80)>>7; 
    byte = byte<<1;
    nRF2401A_CLK1 = 0;
    nRF2401A_CLK1 = 0;
    nRF2401A_CLK1 = 0;
    nRF2401A_CLK1 = 1;
    nRF2401A_CLK1 = 1;
  }
  nRF2401A_CLK1 = 0;
}

/*1通道8bit讀出*/
unsigned char nRF2401ARead8BitChannel_1(void)
{
  unsigned char temp;
  unsigned char byte = 0x00;
   
  nRF2401A_READ_DATA();
  for(temp=8;temp>0;temp--)
  {
    byte = byte<<1;
    nRF2401A_CLK1 = 1;
    nRF2401A_CLK1 = 1;
    nRF2401A_CLK1 = 1;
    nRF2401A_CLK1 = 1;
    byte = byte|(nRF2401A_DATA_PIN&0x01);
    nRF2401A_CLK1 = 0;
  }
  return(byte);
}

/****************************************擴展函數*******************************************/

/*配置寄存器*/
void nRF2401AConfigRegisters(unsigned char* p)
{
  unsigned char temp;
  
  nRF2401A_CONFIG_MODE();
  for(temp=0; temp<15; temp++)
  {
    nRF2401AWrite8Bit(p[temp]);
  }
  nRF2401A_STANDBY_MODE();
}

/*寫通道1發送數據寄存器*/
void nRF2401AWriteTxPayload(unsigned char* p,unsigned char total)
{
  unsigned char temp;
  
  nRF2401A_ACTIVE_MODE();
  nRF2401AWrite8Bit(0xcc);//發送地址高8位默認設定為0xcc
  nRF2401AWrite8Bit(0xcc);//發送地址低8位默認設定為0xcc
  for(temp=0; temp<total; temp++)
  {
   nRF2401AWrite8Bit(p[temp]);
  }
  nRF2401A_STANDBY_MODE();
}

/*讀通道1接收數據寄存器*/
void nRF2401AReadRxPayload(unsigned char* p,unsigned char total)
{
  unsigned char temp;
  
  nRF2401A_ACTIVE_MODE();
  for(temp=0; temp<total; temp++)
  {
    p[temp] = nRF2401ARead8BitChannel_1();
  }
}


/****************************************常用函數*******************************************/
/*初始化函數*/
void nRF2401AInitializtion()
{
  nRF2401A_IO_INITIALIZTION();
  nRF2401A_CONFIG_MODE();
  for(unsigned char time=0; time<50; time++)
  {
    for(unsigned char i=0; i<250; i++);
  }//延遲3毫秒，穩定時間
  nRF2401AWrite8Bit(nRF2401AConfig_Byte14);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte13);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte12);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte11);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte10);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte9);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte8);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte7);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte6);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte5);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte4);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte3);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte2);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte1);
  nRF2401AWrite8Bit(nRF2401AConfig_Byte0);
  nRF2401A_STANDBY_MODE();
  nRF2401A_ACTIVE_MODE();
}

/*接收通道1數據包(28字節)*/
unsigned char nRF2401AScanf(unsigned char* p)
{
  if (nRF2401A_DR1_PIN==0){
    return (0);}
  
  nRF2401AReadRxPayload(p,28);
  return(1);
}

/*發送通道1數據包(28字節)*/
void nRF2401APrintf(unsigned char* p)
{
  nRF2401A_CONFIG_1BIT(0);  //配置為發射
  nRF2401AWriteTxPayload(p,28);
  for(unsigned char time=0; time<10; time++)
  {
    for(unsigned char i=0; i<250; i++);
  }//延遲1280us         //適合250K的傳輸速率  Tsby2txSB+Toa(Tsby2txSB=195us Toa=1/datarate*(#databits+1)=1/250000*257=1028us)
  nRF2401A_CONFIG_1BIT(1);  //配置為接收
  nRF2401A_ACTIVE_MODE();
}

/**********************************************/

/*發送范例
unsigned char tx_buf[28];
unsigned char rx_buf[28];
void main()
{
  nRF2401AInitializtion();
  tx_buf[0] = 0;
  tx_buf[1] = 1;//在發送數組中寫入所需信息
  while(1)
  {
    nRF2401APrintf(tx_buf);
    //用發送函數調用發送數組，將其打包發送
  }
}
*/

/*接收范例
unsigned char tx_buf[28];
unsigned char rx_buf[28];
void main()
{
  nRF2401AInitializtion();
  while(1)
  {
    while(nRF2401AScanf(rx_buf)!=1);
    //當沒有接收到數據包時候無限循環，一旦接收到數據包則將其寫入所指定的32字節接收數組rx_buf中
    PORTB = rx_buf[0];
    //將接收到的數據包的第一個字節從B口輸出
  }
}
*/

/*轉發包范例
unsigned char buf[28];
void main()
{
  nRF2401AInitializtion();
  while(1)
  {
    while(nRF2401AScanf(buf)!=1);//等待收到數據包
    nRF2401APrintf(buf);//將收到的數據包原樣發送
    //注釋:nRF2401APrintf() nRF2401AScanf() 兩個函數調用順序完全隨意不用考慮兩者間的內在影響
  }
}
*/