I want to interface MCB2140 with a pressure sensor which will give input for every 1 second.. I connected UART0 to pressure sensor output, UART1 to serial port of PC. The pressure sensor gives the integer value as output.The UART0 will receive data from sensor and should display in hyper terminal for every 1 minute..I wrote the following code..The code gets hanged in startup file at BX R0...Please let me know any other changes required #include <LPC21xx.H> void init_serial (void); int main(void) { init_serial();
while(1) { int getc_serial0; int putc_serial1; } } void init_serial (void) {
PINSEL0 = 0x00050005;
U0LCR = 0x00000083;
U0DLL = 98;
U0LCR = 0x00000003;
U1LCR = 0x00000083;
U1DLL = 98;
U1LCR = 0x00000003;
}
int getc_serial0(void)
{
while (!(U0LSR & 0x01));
return U0RBR;
} int putc_serial1(void)
while (!(U1LSR & 0x20));
U1THR=U0RBR;
return (U1THR);
This is the code which i wrote for using 2 UARTs at a time.
#include <LPC21xx.H> #include<stdio.h> void init_serial() { PINSEL0 = 0x00050005; /* Enabling RxD0 and TxD0, RxD1 and TxD1 */ U0LCR = 0x00000083; /* 8 bits, no Parity, 1 Stop bit * for UART0*/ U0DLL = 98; U0LCR = 0x00000003; /* DLAB = 0 for UART0*/ U1LCR = 0x00000083; /* 8 bits, no Parity, 1 Stop bit for UART1*/ U1DLL = 98; U1LCR = 0x00000003; /* DLAB = 0 * for UART1*/ } int getchar1() { if (U0LSR & 0x01) /* If U0LSR 1st bit contains valid data then return value of U0RBR*/ { return (U0RBR); } else { return 0; /*Else return 0 to the fucntion*/ } } void putchar1() { while(!(U1LSR & 0x20)); /* If U1LSR 5th bit contains valid data the copy the value of getchar1() value to U1THR*/ U1THR=getchar1(); printf("%d",U1THR); } int main() { init_serial(); /* Initailization of UART1 & UART2*/ while(1) /* Infinite loop*/ { getchar1(); /* function for receiving data from sensor */ putchar1(); /* function for transmitting the data to PC hyperterminal*/ } }
The following is the startup.s file where the program hangs at SWI_Handler B SWI_Handler
Vectors LDR PC, Reset_Addr LDR PC, Undef_Addr LDR PC, SWI_Addr LDR PC, PAbt_Addr LDR PC, DAbt_Addr NOP ; Reserved Vector LDR PC, IRQ_Addr LDR PC, [PC, #-0x0FF0] ; Vector from VicVectAddr LDR PC, FIQ_Addr Reset_Addr DCD Reset_Handler Undef_Addr DCD Undef_Handler SWI_Addr DCD SWI_Handler PAbt_Addr DCD PAbt_Handler DAbt_Addr DCD DAbt_Handler DCD 0 ; Reserved Address IRQ_Addr DCD IRQ_Handler FIQ_Addr DCD FIQ_Handler Undef_Handler B Undef_Handler SWI_Handler B SWI_Handler PAbt_Handler B PAbt_Handler
Maybe you need a retarget.c file...?
I tried to add retarget.c file form already available keil examples folder. But it show error
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