topic Re: How to write to and read from GPIO registers in LPC1347 in LPC Microcontrollers

How to write to and read from GPIO registers in LPC1347

injunear — Tue, 06 Jun 2017 11:37:44 GMT

I have spent the last four days searching for info on how to use the GPIOs in a LPC1347. What little I have found assumes an understanding far beyond mine. I want to write a simple program that reads inputs, writes outputs and delays a little at times. After four days of searching I have yet to find even the simple commands that let me read from and write to the GPIO registers. The LPCOpen programs were of little help. Where might I find this information, please?

Re: How to write to and read from GPIO registers in LPC1347

soledad — Tue, 06 Jun 2017 19:09:47 GMT

Hi,

Please check the following document, this is for LPC11u24 however the process is the same for the LPC1347 device.

How to create a new LPC project using LPCOpen and LPCXpresso

Let me know if this helps!!

Have a great day,
Sol

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Re: How to write to and read from GPIO registers in LPC1347

hillbillyinjune — Wed, 07 Jun 2017 13:00:40 GMT

Thank you for your response. Using your recommendation I was able to turn on and off the LED. However I am still unable to read from or write to the GPIO registers. I get errors for what "I think" are legitimate commands. The following is part of my code:

Chip_GPIO_Init(0x50000000);
[Gives error: passing argument 1 of 'Chip_GPIO_Init' makes pointer from integer without a cast [-Wint-conversion]]

Chip_GPIO_SetPinDIROutput((*)0x50000000, 0, 7);
[Gives error: Syntax error]

Chip_GPIO_SetPinState((*)0x50000000, 0, 7, 1);
[Gives error: Syntax error]

Chip_GPIO_SetPinToggle((*)0x50000000, 0, 7, 1);
[Gives error: Syntax error]

x = Chip_GPIO_GetPinState((*)0x50000000, 0, 1);
[Gives error: Syntax error]

Is this the correct way to access the GPIO registers? If not, what is the correct way. If so, where are these errors coming from, please.

Re: How to write to and read from GPIO registers in LPC1347

injunear — Thu, 08 Jun 2017 12:10:33 GMT

I discovered the problem. I need to put "void" in front of the asterisk.