f887bdb6d6
configs/stm32f4discovery/src: Add board support to MAX7219 as numeric display controller
drivers/leds/max7219.c: Add support to MAX7219 to control 7-segment displays
104 lines
3.6 KiB
C
104 lines
3.6 KiB
C
/****************************************************************************
|
|
* configs/stm32f4discovery/src/stm32_max7219_leds.c
|
|
*
|
|
* Copyright (C) 2018 Alan Carvalho de Assis. All rights reserved.
|
|
* Author: Alan Carvalho de Assis <acassis@gmail.com>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/spi/spi.h>
|
|
#include <nuttx/leds/max7219.h>
|
|
|
|
#include "stm32.h"
|
|
#include "stm32_spi.h"
|
|
#include "stm32f4discovery.h"
|
|
|
|
#if defined(CONFIG_SPI) && defined(CONFIG_STM32_SPI1) && \
|
|
defined(CONFIG_LEDS_MAX7219)
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#define MAX7219_SPI_PORTNO 1 /* On SPI1 */
|
|
|
|
/************************************************************************************
|
|
* Public Functions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Name: stm32_max7219init
|
|
*
|
|
* Description:
|
|
* Initialize the max7219 to control 7-segment numeric display
|
|
*
|
|
* Input Parameters:
|
|
* devpath - The full path to the driver to register. E.g., "/dev/numdisp0"
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) on success; a negated errno value on failure.
|
|
*
|
|
************************************************************************************/
|
|
|
|
int stm32_max7219init(FAR const char *devpath)
|
|
{
|
|
FAR struct spi_dev_s *spi;
|
|
int ret;
|
|
|
|
spi = stm32_spibus_initialize(MAX7219_SPI_PORTNO);
|
|
if (spi == NULL)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Register the MAX7219 Driver at the specified location. */
|
|
|
|
ret = max7219_leds_register(devpath, spi);
|
|
if (ret < 0)
|
|
{
|
|
lederr("ERROR: max7219_leds_register(%s) failed: %d\n",
|
|
devpath, ret);
|
|
return ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_SPI && CONFIG_LEDS_MAX7219 */
|