2020年03月15日 | PIC32MX450 串口4中断

// mplab  x IDE V1.7

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

 *

 *                  UART Interrupt Example   

 *

 *********************************************************************

 * FileName:        uart_interrupt.c

 * Dependencies:

 * Processor:       PIC32

 *

 * Compiler:        MPLAB XC32

 *                  MPLAB IDE

 * Company:         Microchip Technology Inc.

 *

 * Software License Agreement

 *

 * The software supplied herewith by Microchip Technology Incorporated

 * (the ?Company?) for its PIC32 Microcontroller is intended

 * and supplied to you, the Company?s customer, for use solely and

 * exclusively on Microchip PIC32 Microcontroller products.

 * The software is owned by the Company and/or its supplier, and is

 * protected under applicable copyright laws. All rights are reserved.

 * Any use in violation of the foregoing restrictions may subject the

 * user to criminal sanctions under applicable laws, as well as to

 * civil liability for the breach of the terms and conditions of this

 * license.

 *

 * THIS SOFTWARE IS PROVIDED IN AN ?AS IS? CONDITION. NO WARRANTIES,

 * WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED

 * TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

 * PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,

 * IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR

 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

 *

 *

 * $Id: uart_interrupt.c 9390 2008-06-16 23:43:04Z rajbhartin $

 * $Name: x.x $

 *

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

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

UART Interrupt Example README

 ***********************************************************************************

 * Objective: Become familiar with PIC32MX tool suite and understand

 *  basic UART Interrupt operations.

 *

 * Tools:

 * 1. MPLAB IDE with PIC32MX support

 * 2. C32 Compiler

 * 3. Explorer 16 Rev 4 or 5 board.

 * 4. RS-232 Cable

 * 5. A Terminal program for Windows - HyperTerminal

 *

 *

 ***********************************************************************************

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

#include // Peripheral Library

//#include

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

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

// Section: Configuration bits

// SYSCLK = 80 MHz (8MHz Crystal/ FPLLIDIV * FPLLMUL / FPLLODIV)

// PBCLK = 40 MHz

// Primary Osc w/PLL (XT+,HS+,EC+PLL)

// WDT OFF

// Other options are don't care

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

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

#pragma config FPLLMUL = MUL_20, FPLLIDIV = DIV_2, FPLLODIV = DIV_1, FWDTEN = OFF

#pragma config POSCMOD = HS, FNOSC = PRIPLL, FPBDIV = DIV_1

//// DEVCFG3

//// USERID = No Setting

//#pragma config FSRSSEL = PRIORITY_7     // Shadow Register Set Priority Select (SRS Priority 7)

//#pragma config PMDL1WAY = ON            // Peripheral Module Disable Configuration (Allow only one reconfiguration)

//#pragma config IOL1WAY = ON             // Peripheral Pin Select Configuration (Allow only one reconfiguration)

//#pragma config FUSBIDIO = ON            // USB USID Selection (Controlled by the USB Module)

//#pragma config FVBUSONIO = ON           // USB VBUS ON Selection (Controlled by USB Module)

//

//// DEVCFG2

//#pragma config FPLLIDIV = DIV_2         // PLL Input Divider (2x Divider)

//#pragma config FPLLMUL = MUL_20         // PLL Multiplier (20x Multiplier)

//#pragma config UPLLIDIV = DIV_12        // USB PLL Input Divider (12x Divider)

//#pragma config UPLLEN = OFF             // USB PLL Enable (Disabled and Bypassed)

//#pragma config FPLLODIV = DIV_1         // System PLL Output Clock Divider (PLL Divide by 1)

//

//// DEVCFG1

//#pragma config FNOSC = PRIPLL           // Oscillator Selection Bits (Primary Osc w/PLL (XT+,HS+,EC+PLL))

//#pragma config FSOSCEN = ON             // Secondary Oscillator Enable (Enabled)

//#pragma config IESO = ON                // Internal/External Switch Over (Enabled)

//#pragma config POSCMOD = HS             // Primary Oscillator Configuration (HS osc mode)

//#pragma config OSCIOFNC = OFF           // CLKO Output Signal Active on the OSCO Pin (Disabled)

//#pragma config FPBDIV = DIV_1           // Peripheral Clock Divisor (Pb_Clk is Sys_Clk/1)

//#pragma config FCKSM = CSDCMD           // Clock Switching and Monitor Selection (Clock Switch Disable, FSCM Disabled)

//#pragma config WDTPS = PS1048576        // Watchdog Timer Postscaler (1:1048576)

//#pragma config WINDIS = OFF             // Watchdog Timer Window Enable (Watchdog Timer is in Non-Window Mode)

//#pragma config FWDTEN = OFF             // Watchdog Timer Enable (WDT Disabled (SWDTEN Bit Controls))

//#pragma config FWDTWINSZ = WISZ_25      // Watchdog Timer Window Size (Window Size is 25%)

//

//// DEVCFG0

//#pragma config DEBUG = OFF              // Background Debugger Enable (Debugger is Disabled)

//#pragma config JTAGEN = ON              // JTAG Enable (JTAG Port Enabled)

#pragma config ICESEL = ICS_PGx1        // ICE/ICD Comm Channel Select (Communicate on PGEC1/PGED1)

//#pragma config PWP = OFF                // Program Flash Write Protect (Disable)

//#pragma config BWP = OFF                // Boot Flash Write Protect bit (Protection Disabled)

//#pragma config CP = OFF                 // Code Protect (Protection Disabled)

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

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

// Section: System Macros

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

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

#define GetSystemClock()              (80000000ul)

#define GetPeripheralClock()          (GetSystemClock()/(1 << OSCCONbits.PBDIV))

#define GetInstructionClock()         (GetSystemClock())

#define DESIRED_BAUDRATE              (9600)      //The desired BaudRate

void WriteString(const char *string);

int main(void)

{

  // Configure the device for maximum performance but do not change the PBDIV

  // Given the options, this function will change the flash wait states, RAM

  // wait state and enable prefetch cache but will not change the PBDIV.

  // The PBDIV value is already set via the pragma FPBDIV option above..

  SYSTEMConfig(GetSystemClock(), SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE);

  mJTAGPortEnable(DEBUG_JTAGPORT_OFF);

  INTConfigureSystem(INT_SYSTEM_CONFIG_MULT_VECTOR);

  INTEnableInterrupts();

    PPSOutput(3, RPD9, U4TX); // Set RPF5 pin as output for U2TX

    //PPSInput(4,U4RX,RPD5);

    PPSInput(4, U4RX, RPB2);

    PORTSetPinsDigitalIn(IOPORT_B, BIT_2);

  // Explorer-16 uses UART4 to connect to the PC.

  // This initialization assumes 36MHz Fpb clock. If it changes,

  // you will have to modify baud rate initializer.

  UARTConfigure(UART4, UART_ENABLE_PINS_TX_RX_ONLY);

  UARTSetFifoMode(UART4, UART_INTERRUPT_ON_TX_NOT_FULL | UART_INTERRUPT_ON_RX_NOT_EMPTY);

  UARTSetLineControl(UART4, UART_DATA_SIZE_8_BITS | UART_PARITY_NONE | UART_STOP_BITS_1);

  //U4MODE = 1 << 3;

  UARTSetDataRate(UART4, GetPeripheralClock(), DESIRED_BAUDRATE);

  UARTEnable(UART4, UART_ENABLE_FLAGS(UART_PERIPHERAL | UART_RX | UART_TX));

  // Configure UART4 RX Interrupt

//  INTEnable(INT_SOURCE_UART_RX(UART4) | INT_SOURCE_UART_TX(UART4), INT_ENABLED);

  INTSetVectorPriority(INT_VECTOR_UART(UART4), INT_PRIORITY_LEVEL_3);

  INTSetVectorSubPriority(INT_VECTOR_UART(UART4), INT_SUB_PRIORITY_LEVEL_0);

  INTEnable(INT_U4RX,INT_ENABLED);

//  INTEnable(INT_U4TX,INT_ENABLED);

  // configure for multi-vectored mode

  //WriteString("22");

  // Let interrupt handler do the work

  while (1)

  {

//     int data = 0;

//    if (UARTReceivedDataIsAvailable(UART4))

//    {

//      // Echo what we just received.

//      //PutCharacter(UARTGetDataByte(UART4));

//      // Clear the RX interrupt Flag

//      INTClearFlag(INT_SOURCE_UART_RX(UART4));

//    }

  }

  return 0;

}

// helper functions

void WriteString(const char *string)

{

  while (*string != '')

    {

      while (!UARTTransmitterIsReady(UART4))

        ;