CC2540 SPI SLAVE WITH INT

/***********************************************************************************
* INCLUDES
*/

#include <hal_types.h>

#include <ioCC254x_bitdef.h>

#include "ioCC2540.h"



/***********************************************************************************
* CONSTANTS
*/

// These values will give a baud rate of approx. 2.00 Mbps at 32 MHz system clock.
#define SPI_BAUD_M  0
#define SPI_BAUD_E  16


// Define size of buffer.
#define BUFFER_SIZE 252

/***********************************************************************************
* LOCAL VARIABLES
*/

/***********************************************************************************
* LOCAL FUNCTIONS
*/
void MyTime(uint16 tdelay)
{
  for(unsigned short i=0;i<tdelay;i++)
  {
    asm("NOP");
  }
}

/***********************************************************************************
* @fn          uart0rx_isr
*
* @brief       Interrupt routine which receives data from master
*
* @param       none
*
* @return      0
*/

#pragma vector = URX0_VECTOR
__interrupt void uart0rx_isr(void)
{
  

    static uint8 bufferIndex = 0;

   
    if(U0DBUF == 0xAC || U0DBUF == 0xCA)                                        //   || U0DBUF == 0x00
    {
      P0_1 = 0;   // LED Off.
    }
    else
    {
      P0_1 = 1;   // LED On.
    }
    
asm("NOP");
 asm("NOP");
 asm("NOP");

    
    P0_1 = 1;   // LED On.
    
  
}



/***********************************************************************************
* @fn          main
*
* @brief       Receive data using SPI in master mode
*
* @param       void
*
* @return      void
*/

void main(void)
{
  #define SPIMY  0x10
    /****************************************************************************
     * Clock setup
     * See basic software example "clk_xosc_cc254x"
     */
    
    // Set system clock source to HS XOSC, with no pre-scaling.
    CLKCONCMD = (CLKCONCMD & ~(CLKCON_OSC | CLKCON_CLKSPD)) | CLKCON_CLKSPD_32M;
    // Wait until clock source has changed.
    while (CLKCONSTA & CLKCON_OSC);
    
    // Note the 32 kHz RCOSC starts calibrating, if not disabled.
    
    
    /***************************************************************************
     * Setup I/O ports
     *
     * Port and pins used USART0 operating in SPI-mode are
     * MISO (MI): P0_2
     * MOSI (MO): P0_3
     * SSN (SS) : P0_4
     * SCK (C)  : P0_5
     *
     * These pins can be set to function as peripheral I/O so that they
     * can be used by USART0 SPI. Note however, when SPI is in master mode,
     * only MOSI, MISO, and SCK should be configured as peripheral I/O's.
     * If the external slave device requires a slave select signal (SSN),
     * this can be implemented by using general-purpose I/O pin configured as
     * output.
     */


    PERCFG = 0x00;    

    P2DIR = 0x00;

    
    //// Set pins 2, 3 and 5 as peripheral I/O and pin 4 as GPIO output.
    //P0SEL = 0x2c;       // Master Mode
    //P0DIR = 0x12;       // Master Mode P0_1 LED
    
    
    //Set pins 2, 3, 4 and 5 as peripheral I/O.
    P0SEL = 0x3c;       // Slave Mode
    P0DIR = 0x02;       // Slave Mode P0_1 LED
    

    P1SEL = 0x00;      // GPIO.
    P1DIR = 0x00;      // Output.
    
    
    
    P0_1 = 1;          // LED On.

    
    
     /***************************************************************************
     * Setup interrupt
     */

    // Clear CPU interrupt flag for USART0 RX (TCON.URX0IF)
    URX0IF = 0;

    // Set individual interrupt enable bit in the peripherals SFR
    // Not any.

    // Enable interrupt from USART0 RX by setting [IEN0.URX0IE=1]
    URX0IE = 1;

    // Enable global interrupts
    EA = 1;
    
    

    /***************************************************************************
     * Configure SPI
     */

    //// Set USART to SPI mode and Master mode.
    //U0CSR = 0x00;

     // Set USART to SPI mode and Slave mode.
    U0CSR = 0x20;
    
    // Set:
    // - mantissa value
    // - exponent value
    // - clock phase to be centered on first edge of SCK period
    // - negative clock polarity (SCK low when idle)
    // - bit order for transfers to LSB first
    U0BAUD =  SPI_BAUD_M;
    U0GCR = SPIMY;

 while(1); 
    
}


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