Problem UART Interrupt LPC2134

robertorober — Sun, 10 Jul 2016 00:05:00 GMT

First hello to everyone.

Sorry for my English.

I tell you.

I'm starting to use microcontrollers ARM7 specifically the LPC2134 and I am performing a bidirectional serial communication.

The program consists blink an LED to verify that the system is working, and UART communication with a PC and a serial adapter to convert levels.

My purpose is to use a vectored IRQ interrupt, so that when some data arrives the program stops and observe the interrupt and save the received data in an array for later processing.

In addition I make a bluque sending the ASCII table to the PC.

My problem is that encuanto recivo a data interruption jumps and I can not in any way out of it by staying in an infinite loop in the interruption.

The program I'm doing with the KEIL 4.

Main Program

int main()

{

Init_pll();

VICIntEnClr=0xFFFF;//Borro cualquier posible interrupcion

Init_gpio();

init_uart();

i=0;

while (1)

{

for(i=0;i<256;i++)

{

LED_blink ();//Parpadeo del LED

ENVIA_BYTETX0(i);

}

UART CONFIGURATION

void init_uart(void)

{

U0LCR=0x03;

U0FDR=0x10;//Multivall a 1

U0LCR|=BIT7;//Activo Bit DLAB para poder configurar velocidad

U0DLL=divisor & 0xFF;

U0DLM = (divisor >> & 0xFF;

U0LCR &=~BIT7;//Borro Bit DLAB para poder configurar velocidad

U0FCR=1;//Activo FIFO

U0IER = 0;//Desabilito interrupciones UART 1

VICIntSelect &= ~(1<<UART_0);

VICDefVectAddr |= (1<<UART_0);

VICVectCntl10 = 0x20 | UART_0; /* Prioridad 0 Vectorizada use it for UART 0 Interrupt*/

VICVectAddr10 = (unsigned long)RX_UART_CERO ; /* set interrupt vector in 0 */

VICIntEnable |= BIT6; /* Enable UART0 Interrupt */

U0IER = 1;//Habilito interrupcion de recepcion de datos validos

}

INTERRUPT

_irq void RX_UART_CERO (void)

{

if(U0IIR&DR) // Infinite loop

{

while (!(U0LSR&DR));

if(PUNT_W0<512)

{

BUFFER_UART0[PUNT_W0]=U0RBR;

PUNT_W0++;

}

else;

}

else;

VICVectAddr &= 0x0000;//Clear Flag Interrupts but not exit and return to Infinite loop

}

Everything works fine until you receive date UART in the LPC. Then jumps to the interruption and there does not come out.

No longer what to do, I take several days reading the datasheet and reviewing the program, but can not find anything wrong.

I request help from someone who can guide me to solve the problem and continue learning.

Thanks you very much.

Re: Problem UART Interrupt LPC2134

CarlosCasillas — Mon, 18 Jul 2016 22:18:29 GMT

Hi Roberto,

It seems that your code is not clearing the U0IIR register, which indicates if there is a pending interrupt, causing a loop on the ISR. For further details, you could refer to the following links:

http://www.keil.com/forum/20979/

http://www.nxp.com/documents/application_note/AN10414.pdf

Hope this will be useful for you.
Best regards!
/Carlos
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Re: Problem UART Interrupt LPC2134

robertorober — Thu, 28 Jul 2016 11:21:27 GMT

Ok.

Thanks you very much Carlos.

Thanks to your help I could solve the problem.

Best regards.

Roberto

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