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Uart1 Tx pin Configuration

Question asked by mustafa çakır on Jul 24, 2013
Latest reply on Aug 1, 2013 by jeremyzhou

Hi everyone;

 

I am beginner in ARM programming  and I try to send a message via UART1 module in FRDM KL25Z board. For this job, I writed following code for Uart configuration in Uvison:

 

 

SIM->SCGC5    |= (1UL <<  9)|(1UL <<  10) | (1UL <<  12)|(1UL <<  11)|(1UL <<  13);      /* Enable Clock to Port B ,c,A& D,E */
   SIM->SCGC5|=1UL<<5; // TSI clock
    SIM->SCGC4|=1UL<<11 |1UL<<7; //UART1 clock

SIM->SOPT5|=(1UL<<17) ;
SIM->SCGC4|= 1UL<<11;



  PORTB->PCR[18] = (1UL <<  8);                      /* Pin PTB18 is GPIO */
  PORTB->PCR[19] = (1UL <<  8);                      /* Pin PTB19 is GPIO */
  PORTD->PCR[1]  = (1UL <<  8);                      /* Pin PTD1  is GPIO */

  FPTB->PDOR = (led_mask[0] |
               led_mask[1] );          /* switch Red/Green LED off  */
  FPTB->PDDR = (led_mask[0] |
               led_mask[1] );          /* enable PTB18/19 as Output */

  FPTD->PDOR = led_mask[2];            /* switch Blue LED off  */
  FPTD->PDDR = led_mask[2];            /* enable PTD1 as Output */
    
//port d
PORTD->PCR[5]=   (1UL <<  8);
  // PORTC->PCR[4]|=(1UL<<10);
 
 
 
  ///UART Configuration
  UART1->C2=0;  //Transmitter disable
 
 
 
  UART1->BDL=156;    //Baud Rate
  PORTE->PCR[0]=1UL<<9 | 1UL<<8; //Select Uart tx pin   PTE[0]
  PORTE->PCR[0] = PORT_PCR_ISF_MASK|PORT_PCR_MUX(0x3);
  PORTA->PCR[15] = PORT_PCR_ISF_MASK|PORT_PCR_MUX(0x3);
  PORTC->PCR[4]=PORT_PCR_ISF_MASK|PORT_PCR_MUX(0x3);
  UART1->C2=1UL<<3;  //Transmitter Enable

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According to reference manual the Tx port is initially high,however ,when I tried my code there is no signal in PTE[0}. I could not understand where my mistake is . Please ,show my mistake

 

Thanks for your care

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