serial communication interrupt for MC9S08DN16 controller

vikassubramani — Wed, 02 Jul 2014 21:16:55 GMT

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

/* Problem that i am facing is that the interrupt function is getting executed twice instead of just once */

/* and the other problem is that on the screen it indicates that the interrupt function has some syntax error i have included the photo shots */

/* I have also included the screen shots of the result please go through */

/* last updated 7/2/2014 */

/* MC9S08DN16 */

/* The below program is a sample code with the following configuration */

/* SCI enable */

/* 19200 baud rate, 8 data bits, 1stop bit, No parity bit and i am using a 9.8304 MHz external oscillator */

/* Idle wake up */

/* Idle character bit count starts after stop bit */

/* receiver wake up to standby mode */

/* transmitter enable */

/* RS_485 direction set to receive */

/* Interrupt on receiver full */

/* Any problem in the code go through MCU_init(void) function */

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

#include <hidef.h>

#include "derivative.h"

void pin_initialization(void);

void UART_initialization(void);

void mode_initialization(void);

void MCU_init(void);

char ReceivedByte, temp;

int flag;

void delay(int i);

void main(void)

{

EnableInterrupts;

flag = 1;

pin_initialization();

mode_initialization();

UART_initialization();

MCU_init();

while(1);

}

void pin_initialization(void)

{

PTEDD_PTEDD2 = 1;

PTEPE_PTEPE2 = 0;

PTESE_PTESE2 = 0;

PTED_PTED2 = 0; // MAX 8032 IC '0' for Reception and '1' for transmission

}

void UART_initialization(void)

{

/* baud rate generator calculations */

/* Using 9.8304 MHz oscillator hence SBR12:SRB0 = ((bus clk)/(16*baud rate)) ===> ((9830400/2)/(16*19200)) = 16 = ox10 */

SCI1BDH = 0x00;

SCI1BDL = 0x10;

/* configuring register SCI1C1 bit by bit */

SCI1C1_PT = 0;

SCI1C1_PE = 0;

SCI1C1_ILT = 1;

SCI1C1_WAKE = 0;

SCI1C1_M = 0 ;

SCI1C1_RSRC = 0;

SCI1C1_SCISWAI = 0;

SCI1C1_LOOPS = 0;

/* configuring register SCI1C2 bit by bit */

SCI1C2_SBK = 0;

SCI1C2_RWU = 0;

SCI1C2_RE = 1;

SCI1C2_TE = 1;

SCI1C2_ILIE = 1;

SCI1C2_RIE = 1;

SCI1C2_TCIE = 0;

SCI1C2_TIE = 0;

/* configuring register SCI1C3 bit by bit */

SCI1C3_PEIE = 0;

SCI1C3_FEIE = 0;

SCI1C3_NEIE = 0;

SCI1C3_ORIE = 0;

SCI1C3_TXINV = 0;

SCI1C3_T8 = 0;

SCI1C3_R8 = 0;

}

/* Changing mode to PBE Mode */

void mode_initialization(void)

{

/* Transition from FEI mode to FBE mode */

MCGC2 = 0x36;

while (MCGSC_OSCINIT == 0);

asm SEI; // Disables all interrupt

MCGC1 = 0xB8;

while(MCGSC_IREFST == 1);

while(!(MCGSC_CLKST == 2));

/* Transition from FBE mode into BLPE mode */

MCGC2 = 0x3E;

asm CLI; // Enabled interrupt

MCGC1 = 0x98;

MCGC3 = 0x44;

while (MCGSC_PLLST == 0);

/* BLPE mode transitions into PBE mode: */

MCGC2_LP = 0;

while(MCGSC_LOCK == 0);

}

void delay (int i)

{

int j,k;

for(j=0;j<i;j++)

for(k=0;k<j;k++);

}

/* I have used different function name for interrupts as shown below but nothing works

__interrupt void Vsci1rx_isr(void)

void interrupt 17 Vsci1rx_isr (void)

__interrupt 17 Vsci1rx_isr (void)

void interrupt 17 Vsci1rx_isr (void)

{

flag++; // Global variable

temp = SCI1S1; // ACK the flags

ReceivedByte = SCI1D; // rading the data from the buffer

SCI1S2_RXEDGIF = 1; // Clearring the RXEDGIF pin (no effect even if i commented it )

delay(50);

}

/* I also used the below commented code it also has same result

void interrupt 17 Vsci1rx_isr (void)

{

temp = SCI1S1;

ReceivedByte = SCI1D;

delay(200);

ReceivedByte += 1;

PTED_PTED2 = 1;

delay(100);

while (SCI1S1_TDRE == 0);

SCI1D = ReceivedByte;

delay(200);

PTED_PTED2 = 0;

} */

void MCU_init(void)

{

SOPT1_COPT = 0;

SRS = 0xFF; // Clears watch dog timer

SPMSC1 = 0x1C;

/* SPMSC2: LVWF=0,LVWACK=0,LVDV=0,LVWV=0,PPDF=0,PPDACK=0,PDC=0,PPDC=0 */

SPMSC2 = 0x00;

/* ICGC1: RANGE=1,REFS=0,CLKS1=0,CLKS0=0,OSCSTEN=1 */

/* Common initialisation of the CPU registers */

/* PTASE: PTASE7=0,PTASE6=0,PTASE5=0,PTASE4=0,PTASE3=0,PTASE2=0,PTASE1=0,PTASE0=0 */

PTASE = 0x00;

/* PTBSE: PTBSE7=0,PTBSE6=0,PTBSE5=0,PTBSE4=0,PTBSE3=0,PTBSE2=0,PTBSE1=0,PTBSE0=0 */

PTBSE = 0x00;

/* PTCSE: PTCSE7=0,PTCSE6=0,PTCSE5=0,PTCSE4=0,PTCSE3=0,PTCSE2=0,PTCSE1=0,PTCSE0=0 */

PTCSE = 0x00;

/* PTDSE: PTDSE7=0,PTDSE6=0,PTDSE5=0,PTDSE4=0,PTDSE3=0,PTDSE2=0,PTDSE1=0,PTDSE0=0 */

PTDSE = 0x00;

/* PTESE: PTESE7=0,PTESE6=0,PTESE5=0,PTESE4=0,PTESE3=0,PTESE2=0,PTESE1=0,PTESE0=0 */

PTESE = 0x00;

/* PTFSE: PTFSE7=0,PTFSE6=0,PTFSE5=0,PTFSE4=0,PTFSE3=0,PTFSE2=0,PTFSE1=0,PTFSE0=0 */

PTFSE = 0x00;

/* PTGSE: PTGSE7=0,PTGSE6=0,PTGSE5=0,PTGSE4=0,PTGSE3=0,PTGSE2=0,PTGSE1=0,PTGSE0=0 */

PTGSE = 0x00;

/* ### Init_COP init code */

// SRS = 0xFF; /* Clear WatchDog counter */

}

// Please Help me as i am stuck in UART for the past 3 weeks and because of which i am not able to move forward

topic serial communication interrupt for MC9S08DN16 controller in 8-bit Microcontrollers

serial communication interrupt for MC9S08DN16 controller