LT8920驱动程序

#include "Problock_IO.h" #include "LT8920.h" #define CRC_ERROR_BIT 15 #define PKT_FLAG_BIT 6 #define LT8920_FIFO_LEN (63-2) #define STS_IDEL 0 #define STS_TX 1 #define STS_RX 2 static uint8_t gs_u8rxModeFlag = 0; static void LT_SPI_WriteReg(uint8_t u8reg, uint16_t u16dat); static uint16_t LT_SPI_ReadReg(uint8_t u8reg); static void LT8920_Set_Rf_Status(uint8_t ch, uint8_t sts); static void LT8920_SetRxMode(uint8_t ch); static uint8_t spi_send(uint8_t u8dat); static void spi_setDataMode(uint32_t u32mode); #ifdef LT8920_PKT extern volatile uint8_t g_u8pkt_flag; #endif bool LT8920_Init() { uint16_t u16Val = 0; GPIO_digitalWrite(RST,LOW); Delay_ms(2); GPIO_digitalWrite(RST,HIGH); Delay_ms(5); LT_SPI_WriteReg( 0, 0x6fe0 ); LT_SPI_WriteReg( 1, 0x5681 ); LT_SPI_WriteReg( 2, 0x6617 ); LT_SPI_WriteReg( 4, 0x9cc9 ); LT_SPI_WriteReg( 5, 0x6637 ); LT8920_Set_Rf_Status(0, STS_IDEL);//set RF=2402Mhz;status=idel LT_SPI_WriteReg( 8, 0x6c90 ); LT_SPI_WriteReg( 9, 0x1840); //set Tx power level LT_SPI_WriteReg( 10, 0x7ffd );//Crystal osc enable LT_SPI_WriteReg( 11, 0x08 ); LT_SPI_WriteReg( 12, 0x00 ); LT_SPI_WriteReg( 13, 0x48bd ); LT_SPI_WriteReg( 22, 0xff ); LT_SPI_WriteReg( 23, 0x8005 ); //VCO check LT_SPI_WriteReg( 24, 0x67 ); LT_SPI_WriteReg( 25, 0x1659 ); LT_SPI_WriteReg( 26, 0x19e0 ); LT_SPI_WriteReg( 27, 0x1300 ); LT_SPI_WriteReg( 28, 0x1800 ); LT_SPI_WriteReg( 32, 0x4800 ); //data packet format:PREAMBLE(3bytes);SYNCWORD(32bits);TRAILER(4bits):DATA_TYPE(NRZ raw data) LT_SPI_WriteReg( 33, 0x3fc7 ); LT_SPI_WriteReg( 34, 0x2000 ); LT_SPI_WriteReg( 35, 0x0a00 );//idle mode;if enable auto_ack,Tx retries=10(max Tx retries=15) ////set unique sync words for each over-the-air network(similar to a MAC addr) start // //NOTE:if SYNCWORD_LEN(in Reg32) is 32bits,the value should be written into {Reg39[15:0],Reg36[15:0]} // LT_SPI_WriteReg( 36, SYNC_PRE_CODE ); //// LT_SPI_WriteReg( 37, 0x0000 ); //// LT_SPI_WriteReg( 38, 0x0000 ); // LT_SPI_WriteReg( 39, 0x0000 ); ////set unique sync words for each over-the-air network(similar to a MAC addr) end LT_SPI_WriteReg( 40, 0x2101 );//FIFO thershold;SYNCWORD thershold(allow 0 error bits) LT_SPI_WriteReg( 41, 0xb800 );//enable CRC;1st byte of payload is data length(max=255bytes);AUTO_ACK is ON;PKT_flag and FIFO_flag HIGH effective LT_SPI_WriteReg( 42, 0xfdff );//if enable auto_ack,255us to wait for RX_ACK(@62.5Kbps) LT_SPI_WriteReg( 43, 0x000f ); //set data rate=62.5Kbps LT_SPI_WriteReg( 44, 0x1000 ); LT_SPI_WriteReg( 45, 0x0552 ); Delay_ms(100); u16Val = LT_SPI_ReadReg(32); #ifdef DEBUG_LT8920 printf("[LT8920](r32):0x%x\n",u16Val); #endif if(0x4800 != u16Val) { #ifdef DEBUG_LT8920 printf("[LT8920]Init Error!!\n"); #endif return false; } return true; } static void LT_SPI_WriteReg(uint8_t u8reg, uint16_t u16dat) { uint8_t u8dat; //SPI_MODE1(CPOL=0,CPHA=1) spi_setDataMode(SPI_MODE_1); //enable SPI tranaction GPIO_digitalWrite(SS1,LOW); //Select register to write spi_send(u8reg); //write high byte u8dat = u16dat >> 8; spi_send(u8dat); //write low byte u8dat = (uint8_t)u16dat & 0xFF; spi_send(u8dat); //disable SPI tranaction GPIO_digitalWrite(SS1,HIGH); //SPI_MODE0(CPOL=0,CPHA=0) spi_setDataMode(SPI_MODE_0); } static uint16_t LT_SPI_ReadReg(uint8_t u8reg) { uint16_t u16Val; //SPI_MODE1(CPOL=0,CPHA=1) spi_setDataMode(SPI_MODE_1); //enable SPI tranaction GPIO_digitalWrite(SS1,LOW); // delay(2); //when reading a Register,the Address should be added with 0x80. u8reg += 0x80; spi_send(u8reg); //read data from reg u16Val = spi_send(0); u16Val <<= 8; u16Val += spi_send(0); //disable SPI tranaction GPIO_digitalWrite(SS1,HIGH); //SPI_MODE0(CPOL=0,CPHA=0) spi_setDataMode(SPI_MODE_0); return u16Val; } //set unique sync words for each over-the-air network(similar to a MAC addr) //NOTE:SYNCWORD_LEN(in Reg32) is 32bits void LT8920_Set_Sync_Code(uint32_t u32code) { uint16_t u16code = 0; LT8920_Set_Rf_Status(0, STS_IDEL);//set RF=2402Mhz;status=idel u16code = (uint16_t)u32code; LT_SPI_WriteReg( 36, u16code ); u16code = (uint16_t)(u32code >> 16); LT_SPI_WriteReg( 39, u16code ); } uint32_t LT8920_Get_Sync_Code() { uint32_t u32code; u32code = LT_SPI_ReadReg(39); u32code <<= 16; u32code = u32code + LT_SPI_ReadReg(36); return u32code; } static void LT8920_Set_Rf_Status(uint8_t ch, uint8_t sts) { uint16_t u16code = 0; gs_u8rxModeFlag = 0; switch(sts) { case STS_IDEL: u16code = 0; break; case STS_TX: u16code = 0x0100 + (ch & 0x7F); break; case STS_RX: u16code = (ch & 0x7F) | 0x80; gs_u8rxModeFlag = 1; break; default: u16code = 0;//idel break; } LT_SPI_WriteReg( 7, u16code );//set RF=(2402+ch)Mhz and status } uint8_t LT8920_Send(uint8_t ch, uint8_t *pbuf, uint8_t u8len) { uint8_t i; uint16_t u16sts = 0; uint8_t TxFlag = 0; if(NULL == pbuf) { return TxFlag; } if(u8len > LT8920_FIFO_LEN) { #ifdef DEBUG_LT8920 printf("[LT8920]length exceeds the limit(61bytes)\n"); #endif return TxFlag; } //stop Tx and Rx LT8920_Set_Rf_Status(ch, STS_IDEL);//set RF;status=idel //clean FIFO LT_SPI_WriteReg( 52, 0x8080 ); //Select TXRX_FIFO_REG spi_setDataMode(SPI_MODE_1); GPIO_digitalWrite(SS1,LOW); // delay(2); spi_send(50); //1st byte is Tx_package length spi_send(u8len); //write data to FIFO for(i=0; i<u8len; i++) { spi_send(*pbuf); pbuf++; } GPIO_digitalWrite(SS1,HIGH); //set RF channel;enable Tx and start to transfer LT8920_Set_Rf_Status(ch, STS_TX);//set RF;status=TX #ifdef LT8920_PKT g_u8pkt_flag = 0; while(0 == g_u8pkt_flag);//PKT and PKT_flag=1 after Tx packet has been sent #else while(1) { u16sts = LT_SPI_ReadReg(48); if (u16sts & (1 << PKT_FLAG_BIT)) { break; } } #endif u16sts = LT_SPI_ReadReg(52); u16sts = u16sts & 0x3F;//FIFO_RD_PTR if(0 == u16sts) { #ifdef DEBUG_LT8920 printf("[LT8920]TX_ACK\n"); #endif TxFlag = TX_ACK; } else if(u8len + 2 == u16sts) { #ifdef DEBUG_LT8920 printf("[LT8920]TX_NOACK\n"); #endif TxFlag = TX_NOACK; } else { #ifdef DEBUG_LT8920 printf("[LT8920]TX_UNKNOW\n"); #endif } return TxFlag; } static void LT8920_SetRxMode(uint8_t ch) { LT8920_Set_Rf_Status(ch, STS_IDEL);//set RF;status=idel //clean FIFO LT_SPI_WriteReg( 52, 0x8080 ); //set RF channel;enable Rx and start to receive LT8920_Set_Rf_Status(ch, STS_RX);//set RF;status=RX Delay_ms(1); } //NOTE:before first calling LT8920_Receive();should call LT8920_SetRxMode() //return val:0(none data),-1(data exception) int LT8920_Receive(uint8_t ch, uint8_t *pbuf, int nsize, unsigned long timeout_ms) { int i; uint16_t u16sts = 0; int nlen = 0; if(!gs_u8rxModeFlag) { LT8920_SetRxMode(ch); } Set_Timer(timeout_ms); while(1) { if( Is_Timer_Arrived() ) { return nlen; } #ifdef LT8920_PKT if(1 == g_u8pkt_flag)//PKT and PKT_flag=1 when Rx packet has been received by framer { g_u8pkt_flag = 0; u16sts = LT_SPI_ReadReg(48); break; } #else u16sts = LT_SPI_ReadReg(48); if( u16sts & (1 << PKT_FLAG_BIT) ) { break; } #endif } //CRC check if( u16sts & (1 << CRC_ERROR_BIT) ) { #ifdef DEBUG_LT8920 printf("[LT8920]CRC_ERROR\n"); #endif nlen = -1; goto END; } //SPI_MODE1(CPOL=0,CPHA=1) spi_setDataMode(SPI_MODE_1); //enable SPI tranaction GPIO_digitalWrite(SS1,LOW); // delay(2); //when reading a Register,the