Dear All,

I'm having problem to use "fast" GPIO on my LPC2103. I need to set GPIO pin
P0.8 and P0.9 to high and low, but couldn't make it.

Following are several ways, which I tried but can't see the high or low at
the pins.

1.

PINSEL0 = (PINSEL0 && 0xFFFFFEFF) || 0x00000100;

FIODIR = (FIODIR && 0xFFFFFEFF) || 0x00000100;

FIOCLR = (FIOCLR && 0xFFFFFEFF) || 0x00000100;

FIOSET = (FIOSET && 0xFFFFFEFF) || 0x00000100;

FIOCLR = (FIOCLR && 0xFFFFFEFF) || 0x00000100;

2.

IODIR = 0x00000100 ;//pin P0.7 configured as output

IOCLR = 0x00000100 ;//P0.7 goes LOW

IOSET = 0x00000100 ;//P0.7 goes HIGH

IOCLR = 0x00000100 ;//P0.7 goes LOW

3.

IODIR |= (1<<8) ;//pin P0.8 configured as output

delay_10us(3);

IOPIN |= (1<<8) ;

delay_10us(3);

IOSET |= (1<<8) ;//P0.8 goes HIGH

delay_10us(3);

IOCLR |= 0x00000100 ;//P0.8 goes LOW

delay_10us(3);

IOSET |= (1<<8) ;//P0.8 goes HIGH

delay_10us(3);

IOCLR |= (1<<8) ;//P0.8 goes LOW

3.

FIOMASK |= (unsigned char)(1<<8);

FIODIR |= (unsigned char)(1<<8);

FIOSET = (unsigned char)(1<<8);

delay_10us(100);

FIOCLR = (unsigned char)(1<<8);

delay_10us(100);

FIOSET = (unsigned char)(1<<8);

delay_10us(100);

FIOCLR = (unsigned char)(1<<8);

delay_10us(100);

4.

FIOMASK0 |= (unsigned char)0x00000100;

FIODIR0 |= (unsigned char)0x00000100;

FIOSET0 = (unsigned char)0x00000100;

delay_10us(100);

FIOCLR0 = (unsigned char)0x00000100;

delay_10us(100);

FIOSET0 = (unsigned char)0x00000100;

delay_10us(100);

FIOCLR0 = (unsigned char)0x00000100;

delay_10us(100);

5.

FIODIR0 = (unsigned char)0x00000100));

PINSEL0 = (unsigned char)0x00000100));

No. 5 is seems to be woking, but the pin can't make it to be off.

I'm not able to find the problem.

Could anybody please help me out for any other solution?

Thank you.

Santos

s...@actatek.com

Best Regards,

Santos Kumar Das (s...@actatek.com)

Software Engineer

skype: santos-hectrix

ACTAtek Pte Ltd/ Hectrix Ltd

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TradeHub 21, Singapore 609964

Tel: (65) 65154520

HP: 91165950

Fax: (65) 65154521

Skype: hectrix-santos

E-mail: s...@actatek.com

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Hi,

> PINSEL0 = (PINSEL0 && 0xFFFFFEFF) || 0x00000100;

You're setting PINSEL0 to 1. Excellent.

> FIOSET0 = (unsigned char)0x00000100;

Interesting. Setting FIOSET0 to 0.

> I'm not able to find the problem.

The problem is that you need to read a good book on C. Sorry, no, that's
the solution. The problem is that you don't understand C.

> Could anybody please help me out for any other solution?

Give up now? ;-)

--
Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
CrossWorks for ARM, MSP430, AVR, MAXQ, and now Cortex-M3 processors

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