smc.rar_SMC协议_powerpc_powerpc860t smc_smc_异步通信

/***************************************************************************** * FILENAME: smc.c * * DESCRIPTION: * * The code in this module provides echo capability on SMC1. It's * intent is to provide the beginnings of a debug port that is * mostly compiler independent. If an ASCII terminal is connected * at 38400, N, 8, 1 on port 2(PB3) on the ADS board with no hardware * control, characters typed on the keyboard will be received by * SMC1 and echoed back out the RS232 port to the ASCII terminal. * This function was designed and tested on an ADS850 development board. * Note that if a different baud rate is required, there is a header * file on the netcomm website under the General Software category * that is labelled "Asynchronous Baud Rate Tables". * REFERENCES: * * 1)MPC850 Users Manual * * HISTORY: * * 15 Dec 2007 steven initial release * *------------------------------------------------------------------------------*/ #include "vxWorks.h" #include "ppc860Siu.h" #include "ppc860Cpm.h" #include "ppc860Sio.h" #include "smc.h" /*-------------------- * Global definition * *-------------------*/ int RxIndex = 0; /* the index of next receive BD */ UINT32 immBase; /* the base of internal memory map */ LB *Smc1Buffer; /* Rx and Tx Buffer*/ BDRINGS *RxTxBD; /* Rx and Tx BD */ /*---------------------- * Routine Declaration * *----------------------*/ void SMC1Init(); void InitBDs(); UBYTE Smc1Poll(); void EchoChar(); UBYTE Smc1GetChar(); void Smc1PutChar(UBYTE ch); /*--------------- * get the immr * *--------------*/ UINT32 GetIMMR() { __asm__("mfspr 3, 638"); __asm__("rlwinm 3, 3, 0, 0, 15"); } /* the beginning of the program */ int main() { immBase = GetIMMR(); /* set Rx and Tx BD to dpr */ RxTxBD = (BDRINGS *)(immBase + 0x2000 + 64); /* set Rx and Tx Buffers to dpr */ Smc1Buffer = (LB *)(immBase + 0x2000 + 64 + sizeof(BDRINGS) + 64); SMC1Init(); while (1) { if (Smc1Poll()) EchoChar(); } return 0; } /* initiate SMC1 to UART */ void SMC1Init() { /* set SDMA's RAID */ *MPC860_SDCR(immBase) = SDCR_RAID_BR5; /* set RISC arbitrator ID field to U-bus priority 5 */ /* set PBPAR's SMRxD1 and SMTxD1 */ *MPC860_PBPAR(immBase) |= 0xc0; /* set pb24, 25 peripheral function */ *MPC860_PBDIR(immBase) &= 0xf33f; /* peripheral function 0, 25 SMTXD1, 24 SMRXD1 */ /* set BRGC3's CD 48M / (16 * 38400) - 1 = 77 */ /* *MPC860_BRGC3(immBase) &= 0xFFFFE001; /* enable BRGC3 and set CD 1249(asynchronize) */ /* *MPC860_BRGC3(immBase) |= (48000000/(38400 * 16)) << 1; /* set SIMODE's SMC1CS */ *MPC860_SIMODE(immBase) = 0x00002000; /* set to non multiple mode */ *MPC860_SIMODE(immBase) &= 0xFFFF8FFF; /* *MPC860_SIMODE(immBase) |= MPC860_SIMODE_SMC1_BRG3; /* connect to brg3 */ *SMC_RBASE(immBase + 0x3e80) = (UHWORD) RxTxBD->RxBD; /* set SMC1 rBD */ *SMC_TBASE(immBase + 0x3e80) = (UHWORD) &RxTxBD->TxBD; /* set SMC1 tBD */ /* set SMC1 Parameter RAM's TFCR */ *SMC_RFCR(immBase + 0x3e80) = 0x10; /* ppc big endian mode */ *SMC_TFCR(immBase + 0x3e80) = 0x10; /* ppc big endian mode */ /* set CPCR */ *MPC860_CPCR(immBase) = 0x0091 ; /* set UART parameter BRKLN */ *SMC_MRBLR(immBase + 0x3e80) = 1; *SMC_MAX_IDL(immBase + 0x3e80) = 0; /*set last received break length 0*/ *SMC_BRKEC(immBase + 0x3e80) = 0; /* */ *SMC_BRKCR(immBase + 0x3e80) = 1; /* */ InitBDs(); /* initial event register SMCE1 */ *MPC860_SMCE1(immBase) = 0xff; /* initial mask register SMCM1 */ *MPC860_SMCM1(immBase) = 0x17; /* configure CP interrup register */ *MPC860_CICR(immBase) = 0; /* clear all pending interrupt events*/ *MPC860_CIPR(immBase) = 0xffffffff; /* initial interrupt register CIMR */ *MPC860_CIMR(immBase) |= 0x10; /*------------------------------------*/ /* 8-bit mode, no parity, 1 stop-bit */ /* UART SMC Mode */ /* Normal operation (no loopback), */ /* SMC Transmitter/Receiver Enabled */ /*------------------------------------*/ *MPC860_SMCMR1(immBase) = 0x4820; *MPC860_SMCMR1(immBase) = 0x4823; } /* initiate Rx and Tx BD */ void InitBDs() { int i; for(i = 0; i < SIZE; i++) { /* set RxBD to empty */ RxTxBD->RxBD[i].status = 0x8000; RxTxBD->RxBD[i].length = 1; RxTxBD->RxBD[i].addr =(UBYTE *) &(Smc1Buffer->RxBuffer[i]); } /* set wrap bit */ RxTxBD->RxBD[SIZE - 1].status = 0xa000; /* set wrap bit */ RxTxBD->TxBD.status = 0x2000; RxTxBD->TxBD.length = 1; RxTxBD->TxBD.addr =(UBYTE *) &(Smc1Buffer->TxBuffer); } /* poll the receive buffer */ UBYTE Smc1Poll() { if (RxTxBD->RxBD[RxIndex].status & 0x8000) return 0; else return 1; } /* receive and transmit char */ void EchoChar() { UBYTE data; data = Smc1GetChar(); Smc1PutChar(data); } /* receive char continuously */ UBYTE Smc1GetChar() { UBYTE ch; while(RxTxBD->RxBD[RxIndex].status & 0x8000) { } ch = *(RxTxBD->RxBD[RxIndex].addr); RxTxBD->RxBD[RxIndex].status |= 0x8000; RxIndex = (RxIndex + 1) % SIZE; return ch; } /* transmit char */ void Smc1PutChar(UBYTE ch) { while(RxTxBD->TxBD.status & 0x8000) { } *(RxTxBD->TxBD.addr) = ch; RxTxBD->TxBD.length = 1; RxTxBD->TxBD.status |= 0x8000; }