LPC2132 - Serial garbage

Development Boards MicroMod
1

Hello, I have some problems with my LPC2132, when I try to use uart 0/1, I only get garbage.

My code:

#define TEMP (1<<6)
#define DEMP (1<<0) 

void PLL_config()
{
	VICIntEnable=0x0; // Disable all interrups
	PLLFEED = 0xAA;
	PLLFEED = 0x55;  
	PLLCON = 0x00;  // Disable PLL 
	PLLFEED = 0xAA;
	PLLFEED = 0x55;
	VPBDIV=0x00; // Pclk=fosc/4
}

void serie0_config()
{
	U0FCR=7; // Clean & active FIFO
	U0FDR=0x10;
	U0LCR=0x83;  // Dlab=1 & 8 bits data
	U0DLL=0x60;  // using 14,7465MHz crystal => PLL off => Pclk=fosc/4 => 2400 Bps => Divisor Latch= 96 => 0x0060
	U0DLM=0x00;
	U0LCR=0x03;  // Dlab=0
	U0IER=0; // uart0 interrupt disable;
}

int main(void)
{
	unsigned char flag=0;
	PLL_config();
	PINSEL0=5; // P0.0= TXD0 y P0.1= RXD0 
	PINSEL1=0;
	serie0_config();
	U0THR='a';
	while(1)
		{
		
		if(U0LSR&DEMP)
			{
			 if(U0RBR) { } // Clean U0RBR
			 if(flag==1)
				flag=0;
			else
				{flag=1; U0THR='a';}
			}
		
                if((U0LSR&TEMP)&&flag)
			U0THR='a';
			
		}
}

Using Keil simulation, everything is ok, using proteus too.

When I flash LPC using LPC2000 v2.2.3, everything is fine, but using hyperterminal my tx data and rx data is wrong, I get “á” → 0xC1.

Any idea? Thxs.

2

A couple of things that come to mind:

  • do you have the appropriate level converters

  • try different baud rates

3

start with one of the many working UART code examples.