main.c

来自「mpc55**系列芯片的例程 包括SCI,SPI,TIMER,FIT,EDMA」· C语言 代码 · 共 69 行

/* main.c:  performs a single transfer from DSPI_C to DSPI_B on MPC555x or MPC563x */
/* Rev 1.0 Jun 2 2008 SM - Ported from AN2865 example Rev 2.2 for DSPI C, DSPI B */
/*                         and used POPR[RXDATA] for RecDataMaster, RecDataSlave */
/* Rev 1.1 Aug 15 2008 SM - Modified SIU.DISR line for internal DSPI connections */
/* Rev 1.2 Aug 18 2008 D McKenna- Kept DSPI_MCR[HALT] set during  initialization*/
/* Copyright Freescale Semiconductor, Inc. 2007 All rights reserved. */
/* Notes:  */
/*  1. MMU not initialized; must be done by debug scripts or BAM */
/*  2. SRAM not initialized; must be done by debug scripts or in a crt0 type file */

#include "mpc563m.h" /* Use proper include file such as mpc5510.h or mpc5554.h */

  vuint32_t i = 0;                      /* Dummy idle counter */
  vuint32_t RecDataMaster = 0;          /* Data recieved on master SPI */
  vuint32_t RecDataSlave  = 0;          /* Data received on slave SPI */

void initSysclk (void) {
/* MPC563x: Use the next line        */
  FMPLL.ESYNCR1.B.CLKCFG = 0X7;    /* MPC563x: Change clk to PLL normal from crystal*/  
  FMPLL.SYNCR.R = 0x16080000;         /* 8 MHz xtal: 0x16080000; 40MHz: 0x46100000 */
  while (FMPLL.SYNSR.B.LOCK != 1) {}; /* Wait for FMPLL to LOCK  */
  FMPLL.SYNCR.R = 0x16000000;         /* 8 MHz xtal: 0x16000000; 40MHz: 0x46080000 */
}

void initDSPI_C(void) {
  DSPI_C.MCR.R = 0x80010001;     /* Configure DSPI_C as master */
  DSPI_C.CTAR[0].R = 0x780A7727; /* Configure CTAR0  */
  DSPI_C.MCR.B.HALT = 0x0;	     /* Exit HALT mode: go from STOPPED to RUNNING state*/
  SIU.PCR[107].R = 0x0A00;       /* MPC555x: Config pad as DSPI_C SOUT output */
  SIU.PCR[108].R = 0x0900;       /* MPC555x: Config pad as DSPI_C SIN input */
  SIU.PCR[109].R = 0x0A00;       /* MPC555x: Config pad as DSPI_C SCK output */
  SIU.PCR[110].R = 0x0A00;       /* MPC555x: Config pad as DSPI_C PCS0 output */
}

void initDSPI_B(void) {
  DSPI_B.MCR.R = 0x00010001;     /* Configure DSPI_B as slave */
  DSPI_B.CTAR[0].R = 0x780A7727; /* Configure CTAR0  */
  DSPI_B.MCR.B.HALT = 0x0;	     /* Exit HALT mode: go from STOPPED to RUNNING state*/
  SIU.PCR[102].R = 0x0500;       /* MPC555x: Config pad as DSPI_B SCK input */
  SIU.PCR[103].R = 0x0500;       /* MPC555x: Config pad as DSPI_B SIN input */
  SIU.PCR[104].R = 0x0600;       /* MPC555x: Config pad as DSPI_B SOUT output*/
  SIU.PCR[105].R = 0x0500;       /* MPC555x: Config pad as DSPI_B PCS0/SS input */
}

void ReadDataDSPI_B(void) {
  while (DSPI_B.SR.B.RFDF != 1){}      /* Wait for Transmit Complete Flag = 1 */
  RecDataSlave = DSPI_B.POPR.B.RXDATA; /* Read data received by slave SPI */
  DSPI_B.SR.R = 0x80020000;            /* Clear TCF, RDRF flags by writing 1 to them */
}

void ReadDataDSPI_C(void) {
  while (DSPI_C.SR.B.RFDF != 1){}  /* Wait for Transmit Complete Flag = 1 */
  RecDataMaster = DSPI_C.POPR.B.RXDATA;   /* Read data received by master SPI */
  DSPI_C.SR.R = 0x90020000;        /* Clear TCF, RDRF, EOQ flags by writing 1 */
}

int main(void) {
/* Optional:  Use one of the next two lines for internal DSPI connections: */
/* SIU.DISR.R = 0x0000C0FC; */ /* MPC55xx except MPC563x: Connect DSPI_C, DSPI_D*/
  SIU.DISR.R = 0x00A8A000;     /* MPC563x only: Connect DSPI_C, DSPI_B */
  initSysclk();                /* Set sysclk = 64MHz running from PLL */
  initDSPI_C();                /* Initialize DSPI_C as master SPI and init CTAR0 */
  initDSPI_B();                /* Initialize DSPI_B as Slave SPI and init CTAR0 */
  DSPI_B.PUSHR.R = 0x00001234; /* Initialize slave DSPI_B's response to master */
  DSPI_C.PUSHR.R = 0x08015678; /* Transmit data from master to slave SPI with EOQ */
  ReadDataDSPI_B();            /* Read data on slave DSPI */
  ReadDataDSPI_C();            /* Read data on master DSPI */
  while (1) {i++; }            /* Wait forever */
}