From: Bob Blick <bobblick@outlook.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Thu, 30 Jul 2020 10:24:07 -0700
Subject: Re: [PIC] Simple GCC question
Thread-Topic: [PIC] Simple GCC question
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Hi Neil,

The ports and pins are in main.h

Individually they are constants, but GCC doesn't like using arrays of them =
handed to Lcd_create, it no longer considers them constants. I think.

Thanks, Bob

________________________________________
From: piclist-bounces@mit.edu <piclist-bounces@mit.edu> on behalf of Neil=20
Sent: Thursday, July 30, 2020 10:10 AM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] Simple GCC question

Bob,

Strange way to do this IMO... I would keep ports & pins together in a
struct for each GPIO, then group those together for your call to
lcd_create().
Either way, I'm not sure why gcc thinks your port and pin definitions
aren't constants.  Aren't you using CMSIS for those definitions?
In HAL (which ultimately uses CMSIS), ports and pins are defined in the
mail header file like this...
#define LED_Pin GPIO_PIN_13
#define LED_GPIO_Port GPIOC

Then these are further defined in a deeper file as:
#define GPIO_PIN_13                ((uint16_t)0x2000)  /* Pin 13
selected   */
and...
#define GPIOC               ((GPIO_TypeDef *)GPIOC_BASE)
and then...
#define GPIOC_BASE            (APB2PERIPH_BASE + 0x00001000UL)
and also...
/*!< Peripheral memory map */
#define APB1PERIPH_BASE       PERIPH_BASE
#define APB2PERIPH_BASE       (PERIPH_BASE + 0x00010000UL)
#define AHBPERIPH_BASE        (PERIPH_BASE + 0x00020000UL)

....which are constants.

How/where do you have your ports and pins defined?

Cheers,
-Neil.



--=20
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