Uart1 Tx pin Configuration

mustafaçakır — Wed, 24 Jul 2013 14:26:27 GMT

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

Re: Uart1 Tx pin Configuration

jeremyzhou — Fri, 02 Aug 2013 03:29:40 GMT

Just according to your code that be displayed above, you also need to set the clock source of UART1 through MSG module. You can through the URL which is at below to download the sample code of FRDMKL25Z. The sample codes includes the demo of UART module.

(www.freescale.com/FRDM-KL25Z)

topic Uart1 Tx pin Configuration in Kinetis Microcontrollers

Uart1 Tx pin Configuration

Re: Uart1 Tx pin Configuration