help with LPC23xx

Development Boards MicroMod
1

Hi guys,

I’m a newbie working on a Olimex LPC2378-STK board, I’m trying to get the LCD work, I had problem controlling the LCD_CS line which is P1.21.

I have set

PINSEL3=0x0003C300; // P1.21 is GPIO

FIO1MASK=0x0;

FIO1DIR=1<<21; // P1.21 dir=output

but neither FIO1SET or FIO1CLR works because I always get an 0 in FIO1PIN, what could be the problem?

By the way, I saw the demo code in IAR uses SSP0, what is the difference of SSP0 and SPI0?

Thank you

2

Have you checked to make sure that the FIO controller is enabled?

By default, the GPIO regs are used [at least on the smaller devices].

Cheers,

–David Carne

3

Thanks! That’s the point!

I have to set Bit 0 in SCS:

0 GPIOM GPIO access mode selection. R/W 0

0 GPIO ports 0 and 1 are accessed via APB addresses in a fashion

compatible with previous LPC2000 devices.

1 High speed GPIO is enabled on ports 0 and 1, accessed via addresses in

the on-chip memory range. This mode includes the port masking feature

described in the GPIO chapter.

before using the FIO feature

Thank you!!