Lpc2000

Leonardo Santos wrote:

>Hello All:
>	I'm working with a LPC2106 using the GCC 3.4.4 toolchain (GCC + binutils 2.15 
>+ newlib 1.13).	I wrote a union and a structure to access the P0 pins 
>individually, like this:
>
>typedef struct {
>	int p0	: 1;
>	int p1	: 1;
>	int p2	: 1;
>(...)
>	int p30	: 1;
>	int p31	: 1;
>}port_t;
>
>typedef union {
>	port_t pins;
>	unsigned int reg;
>} ioreg;
>
>typedef struct {
>	ioreg iopin;
>	ioreg ioset;
>	ioreg iodir;
>	ioreg ioclr;
>}gpio_t;
>
>So I declare a pinter like
>
>	volatile gpio_t *gpio = 0xE0028000;
>
>If I access the registers using 
>
>	if( gpio->iopin.reg & 0x01 )
>
>or 
>
>	gpio->ioset.reg |= 0x00008000;
>
>Everithing works fine! But if I try a code like this:
>
>	gpio->ioset.pins.p15 = 1;
>
>To set P0.15, P0.23 and P0.31 are set too! 
>
Seems as if the bit field is a short int...

>I had tried this code in my Linux 
>workstaion and it works just fine. The compiles setting I'm using are 
>
>arm-elf-gcc -c -Wall -D GCC_ARM7 -mcpu=arm7tdmi -Tlpc2106-rom.ld -Wcast-align 
>-O3
>
>So I'm compiling it in ARM mode. Any clues? Is this a compiler issue ( I'm not 
>using the right parameters)?
>
>Thanks a lot!
>
>  
>



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