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boards: Add support to MPR121 Capacitive Keypad
This commit adds support to MPR121 on stm32f4discovery board and a board config example. Signed-off-by: Alan C. Assis <acassis@gmail.com>
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‎boards/arm/stm32/common/include/stm32_mpr121.h‎

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/****************************************************************************
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* boards/arm/stm32/common/include/stm32_mpr121.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __BOARDS_ARM_STM32_COMMON_INCLUDE_STM32_MPR121_H
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#define __BOARDS_ARM_STM32_COMMON_INCLUDE_STM32_MPR121_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Inline Functions
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: board_mpr121_initialize
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*
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* Description:
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* Initialize and register the MPR121 capacitive keypad.
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*
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* Input Parameters:
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* devno - The device number, used to build the device path as /dev/keypadN
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* busno - The I2C bus number
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int board_mpr121_initialize(int devno, int busno);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BOARDS_ARM_STM32_COMMON_INCLUDE_STM32_MPR121_H */

‎boards/arm/stm32/common/src/CMakeLists.txt‎

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@@ -166,4 +166,8 @@ if(CONFIG_INPUT_KMATRIX_I2C)
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list(APPEND SRCS stm32_kmatrix_i2c.c)
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endif()
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if(CONFIG_INPUT_MPR121_KEYPAD)
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list(APPEND SRCS stm32_mpr121.c)
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endif()
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target_sources(board PRIVATE ${SRCS})

‎boards/arm/stm32/common/src/Make.defs‎

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@@ -86,6 +86,10 @@ ifeq ($(CONFIG_SENSORS_APDS9960),y)
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CSRCS += stm32_apds9960.c
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endif
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ifeq ($(CONFIG_INPUT_MPR121_KEYPAD),y)
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CSRCS += stm32_mpr121.c
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endif
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ifeq ($(CONFIG_SENSORS_ZEROCROSS),y)
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CSRCS += stm32_zerocross.c
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endif

‎boards/arm/stm32/common/src/stm32_mpr121.c‎

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/****************************************************************************
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* boards/arm/stm32/common/src/stm32_mpr121.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <nuttx/debug.h>
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#include <stdio.h>
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#include <nuttx/input/mpr121.h>
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#include <arch/board/board.h>
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#include "stm32.h"
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#include "stm32_i2c.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Device I2C Address of MPR121 Capacitive Keypad */
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#define MPR121_I2C_ADDR 0x5a
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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struct stm32_mpr121config_s
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{
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/* Configuration structure as seen by the MPR121 driver */
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struct mpr121_config_s config;
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/* Additional private definitions only known to this driver */
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void *arg; /* Argument to pass to the interrupt handler */
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xcpt_t isr; /* ISR Handler */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int mpr121_irq_attach(const struct mpr121_config_s *state,
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xcpt_t isr, void *arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Keymap for 4x3 MPR121 Capacitive Keypad
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* Keys named 11 and 10 were replaced with 'B' a 'A'
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*/
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static const uint32_t g_mpr121_keymap[] =
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{
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'0', '1', '2', '3',
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'4', '5', '6', '7',
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'8', '9', 'A', 'B',
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};
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/* A reference to a structure of this type must be passed to the MPR121
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* driver. This structure provides information about the configuration
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* of the MPR121 and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active. The
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* memory must be writable because, under certain circumstances, the driver
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* may modify frequency or other values.
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*/
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static struct stm32_mpr121config_s g_mpr121config =
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{
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.config =
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{
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.irq_attach = mpr121_irq_attach,
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.keymap = g_mpr121_keymap,
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},
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* Attach the MPR121 interrupt handler to the GPIO interrupt */
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static int mpr121_irq_attach(const struct mpr121_config_s *state,
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xcpt_t isr, void *arg)
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{
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irqstate_t flags;
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iinfo("mpr121_irq_attach\n");
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flags = enter_critical_section();
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/* Setup interrupt for Falling Edge */
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stm32_gpiosetevent(BOARD_MPR121_GPIO_INT, false, true, true, isr, arg);
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leave_critical_section(flags);
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_mpr121_initialize
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*
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* Description:
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* Initialize and register the MPR121 gesture sensor.
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*
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* Input Parameters:
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* devno - The device number, used to build the device path as /dev/gestN
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* busno - The I2C bus number
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int board_mpr121_initialize(int devno, int busno)
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{
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struct i2c_master_s *i2c;
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char devpath[14];
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int ret;
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iinfo("Initializing MPR121!\n");
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/* Configure the GPIO interrupt */
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stm32_configgpio(BOARD_MPR121_GPIO_INT);
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/* Initialize I2C */
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i2c = stm32_i2cbus_initialize(busno);
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if (i2c == NULL)
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{
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return -ENODEV;
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}
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/* Save this i2c in the config */
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g_mpr121config.config.i2c_dev = i2c;
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g_mpr121config.config.i2c_addr = MPR121_I2C_ADDR;
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/* Then register the capacitive keypad */
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snprintf(devpath, sizeof(devpath), "/dev/keypad%d", devno);
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ret = mpr121_register(&g_mpr121config.config, devpath);
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if (ret < 0)
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{
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ierr("ERROR: Failed registering APDS-9960!\n");
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}
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return ret;
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}

‎boards/arm/stm32/stm32f4discovery/configs/mpr121_keypad/defconfig‎

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#
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# This file is autogenerated: PLEASE DO NOT EDIT IT.
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#
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# You can use "make menuconfig" to make any modifications to the installed .config file.
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# You can then do "make savedefconfig" to generate a new defconfig file that includes your
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# modifications.
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#
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# CONFIG_ARCH_FPU is not set
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# CONFIG_NSH_ARGCAT is not set
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# CONFIG_NSH_CMDOPT_HEXDUMP is not set
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CONFIG_ARCH="arm"
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CONFIG_ARCH_BOARD="stm32f4discovery"
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CONFIG_ARCH_BOARD_COMMON=y
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CONFIG_ARCH_BOARD_STM32F4_DISCOVERY=y
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CONFIG_ARCH_BUTTONS=y
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CONFIG_ARCH_CHIP="stm32"
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CONFIG_ARCH_CHIP_STM32=y
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CONFIG_ARCH_CHIP_STM32F407VG=y
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CONFIG_ARCH_STACKDUMP=y
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CONFIG_BOARD_LATE_INITIALIZE=y
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CONFIG_BOARD_LOOPSPERMSEC=16717
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CONFIG_BUILTIN=y
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CONFIG_DEBUG_FEATURES=y
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CONFIG_EXAMPLES_HELLO=y
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CONFIG_EXAMPLES_KEYBOARD=y
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CONFIG_EXAMPLES_KEYBOARD_DEVPATH="/dev/keypad0"
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CONFIG_FS_PROCFS=y
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CONFIG_HAVE_CXX=y
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CONFIG_HAVE_CXXINITIALIZE=y
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CONFIG_I2C=y
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CONFIG_INIT_ENTRYPOINT="nsh_main"
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CONFIG_INPUT=y
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CONFIG_INPUT_MPR121_KEYPAD=y
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CONFIG_INTELHEX_BINARY=y
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CONFIG_LINE_MAX=64
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CONFIG_MM_REGIONS=2
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CONFIG_NSH_BUILTIN_APPS=y
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CONFIG_NSH_FILEIOSIZE=512
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CONFIG_NSH_READLINE=y
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CONFIG_PREALLOC_TIMERS=4
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CONFIG_RAM_SIZE=114688
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CONFIG_RAM_START=0x20000000
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CONFIG_RAW_BINARY=y
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CONFIG_RR_INTERVAL=200
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CONFIG_SCHED_LPWORK=y
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CONFIG_SCHED_WAITPID=y
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CONFIG_START_DAY=6
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CONFIG_START_MONTH=12
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CONFIG_START_YEAR=2011
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CONFIG_STM32_I2C1=y
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CONFIG_STM32_JTAG_SW_ENABLE=y
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CONFIG_STM32_PWR=y
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CONFIG_STM32_SPI1=y
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CONFIG_STM32_USART2=y
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CONFIG_SYSTEM_NSH=y
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CONFIG_USART2_RXBUFSIZE=128
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CONFIG_USART2_SERIAL_CONSOLE=y
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CONFIG_USART2_TXBUFSIZE=128

‎boards/arm/stm32/stm32f4discovery/include/board.h‎

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#define BOARD_APDS9960_GPIO_INT GPIO_APDS9960_INT
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/* IRQ Pin for MPR121 Capacitive Keypad */
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#define GPIO_MPR121_INT \
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(GPIO_INPUT|GPIO_PULLUP|GPIO_EXTI|GPIO_PORTB|GPIO_PIN0)
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#define BOARD_MPR121_GPIO_INT GPIO_MPR121_INT
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/* LIS3DSH */
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#define GPIO_LIS3DSH_EXT0 \

‎boards/arm/stm32/stm32f4discovery/src/stm32_bringup.c‎

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#include "stm32_apds9960.h"
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#endif
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#ifdef CONFIG_INPUT_MPR121_KEYPAD
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#include "stm32_mpr121.h"
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#endif
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#ifdef CONFIG_CL_MFRC522
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#include "stm32_mfrc522.h"
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#endif
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}
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#endif
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#ifdef CONFIG_INPUT_MPR121_KEYPAD
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/* Initialize MPR121 using I2C1 bus to /dev/keypad0 */
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ret = board_mpr121_initialize(0, 1);
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if (ret < 0)
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{
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syslog(LOG_ERR, "ERROR: board_mpr121_initialize failed: %d\n", ret);
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}
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#endif
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#ifdef CONFIG_LCD_ST7032
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ret = stm32_st7032init("/dev/slcd0");
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if (ret < 0)

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