336 lines
10 KiB
C
336 lines
10 KiB
C
/****************************************************************************
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* boards/arm/stm32/stm3220g-eval/src/stm32_stmpe811.c
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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 <stdbool.h>
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#include <stdio.h>
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#include <assert.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/board.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/input/touchscreen.h>
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#include <nuttx/input/stmpe811.h>
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#include <nuttx/irq.h>
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#include "stm32.h"
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#include "stm3220g-eval.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifdef CONFIG_INPUT_STMPE811
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#ifndef CONFIG_INPUT
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# error "STMPE811 support requires CONFIG_INPUT"
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#endif
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#ifndef CONFIG_STM32_I2C1
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# error "STMPE811 support requires CONFIG_STM32_I2C1"
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#endif
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#ifndef CONFIG_STMPE811_I2C
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# error "Only the STMPE811 I2C interface is supported"
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#endif
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#ifdef CONFIG_STMPE811_SPI
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# error "Only the STMPE811 SPI interface is supported"
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#endif
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#ifndef CONFIG_STMPE811_FREQUENCY
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# define CONFIG_STMPE811_FREQUENCY 100000
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#endif
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#ifndef CONFIG_STMPE811_I2CDEV
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# define CONFIG_STMPE811_I2CDEV 1
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#endif
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#if CONFIG_STMPE811_I2CDEV != 1
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# error "CONFIG_STMPE811_I2CDEV must be one"
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#endif
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#ifndef CONFIG_STMPE811_DEVMINOR
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# define CONFIG_STMPE811_DEVMINOR 0
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#endif
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/* Board definitions ********************************************************/
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/* The STM3220G-EVAL has two STMPE811QTR I/O expanders on board both
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* connected to the STM32 via I2C1. They share a common interrupt line: PI2.
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*
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* STMPE811 U24, I2C address 0x41 (7-bit)
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* ------ ---- ---------------- --------------------------------------------
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* STPE11 PIN BOARD SIGNAL BOARD CONNECTION
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* ------ ---- ---------------- --------------------------------------------
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* Y- TouchScreen_Y- LCD Connector XL
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* X- TouchScreen_X- LCD Connector XR
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* Y+ TouchScreen_Y+ LCD Connector XD
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* X+ TouchScreen_X+ LCD Connector XU
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* IN3 EXP_IO9
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* IN2 EXP_IO10
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* IN1 EXP_IO11
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* IN0 EXP_IO12
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*
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* STMPE811 U29, I2C address 0x44 (7-bit)
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* ------ ---- ---------------- --------------------------------------------
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* STPE11 PIN BOARD SIGNAL BOARD CONNECTION
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* ------ ---- ---------------- --------------------------------------------
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* Y- EXP_IO1
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* X- EXP_IO2
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* Y+ EXP_IO3
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* X+ EXP_IO4
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* IN3 EXP_IO5
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* IN2 EXP_IO6
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* IN1 EXP_IO7
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* IN0 EXP_IO8
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*/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct stm32_stmpe811config_s
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{
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/* Configuration structure as seen by the STMPE811 driver */
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struct stmpe811_config_s config;
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/* Additional private definitions only known to this driver */
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STMPE811_HANDLE handle; /* The STMPE811 driver handle */
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xcpt_t handler; /* The STMPE811 interrupt handler */
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void *arg; /* Interrupt handler argument */
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};
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/****************************************************************************
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* Static Function Prototypes
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind callbacks
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* to isolate the STMPE811 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs.* so that contact and loss-
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* of-contact events can be detected.
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*
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* attach - Attach the STMPE811 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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*/
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static int stmpe811_attach(struct stmpe811_config_s *state, xcpt_t isr,
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void *arg);
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static void stmpe811_enable(struct stmpe811_config_s *state,
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bool enable);
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static void stmpe811_clear(struct stmpe811_config_s *state);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the STMPE811
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* driver. This structure provides information about the configuration
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* of the STMPE811 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 X plate resistance values.
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*/
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#ifndef CONFIG_STMPE811_TSC_DISABLE
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static struct stm32_stmpe811config_s g_stmpe811config =
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{
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.config =
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{
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#ifdef CONFIG_STMPE811_I2C
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.address = STMPE811_ADDR1,
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#endif
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.frequency = CONFIG_STMPE811_FREQUENCY,
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#ifdef CONFIG_STMPE811_MULTIPLE
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.irq = STM32_IRQ_EXTI2,
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#endif
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.ctrl1 = (ADC_CTRL1_SAMPLE_TIME_80 | ADC_CTRL1_MOD_12B),
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.ctrl2 = ADC_CTRL2_ADC_FREQ_3p25,
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.attach = stmpe811_attach,
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.enable = stmpe811_enable,
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.clear = stmpe811_clear,
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},
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.handler = NULL,
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.arg = NULL,
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};
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the STMPE811 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs.
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*
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* attach - Attach the STMPE811 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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*/
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static int stmpe811_attach(struct stmpe811_config_s *state, xcpt_t isr,
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void *arg)
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{
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struct stm32_stmpe811config_s *priv =
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(struct stm32_stmpe811config_s *)state;
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iinfo("Saving handler %p\n", isr);
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DEBUGASSERT(priv);
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/* Just save the handler. We will use it when EXTI interruptsare enabled */
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priv->handler = isr;
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priv->arg = arg;
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return OK;
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}
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static void stmpe811_enable(struct stmpe811_config_s *state, bool enable)
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{
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struct stm32_stmpe811config_s *priv =
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(struct stm32_stmpe811config_s *)state;
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irqstate_t flags;
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/* Attach and enable, or detach and disable. Enabling and disabling GPIO
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* interrupts is a multi-step process so the safest thing is to keep
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* interrupts disabled during the reconfiguration.
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*/
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flags = enter_critical_section();
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if (enable)
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{
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/* Configure the EXTI interrupt using the SAVED handler */
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stm32_gpiosetevent(GPIO_IO_EXPANDER, true, true, true,
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priv->handler, priv->arg);
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}
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else
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{
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/* Configure the EXTI interrupt with a NULL handler to disable it */
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stm32_gpiosetevent(GPIO_IO_EXPANDER, false, false, false,
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NULL, NULL);
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}
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leave_critical_section(flags);
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}
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static void stmpe811_clear(struct stmpe811_config_s *state)
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{
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/* Does nothing */
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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: stm32_tsc_setup
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*
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* Description:
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* This function is called by board-bringup logic to configure the
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* touchscreen device. This function will register the driver as
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* /dev/inputN where N is the minor device number.
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*
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* Input Parameters:
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int stm32_tsc_setup(int minor)
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{
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#ifndef CONFIG_STMPE811_TSC_DISABLE
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struct i2c_master_s *dev;
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int ret;
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iinfo("minor %d\n", minor);
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DEBUGASSERT(minor == 0);
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/* Check if we are already initialized */
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if (!g_stmpe811config.handle)
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{
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iinfo("Initializing\n");
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/* Configure the STMPE811 interrupt pin as an input */
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stm32_configgpio(GPIO_IO_EXPANDER);
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/* Get an instance of the I2C interface */
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dev = stm32_i2cbus_initialize(CONFIG_STMPE811_I2CDEV);
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if (!dev)
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{
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ierr("ERROR: Failed to initialize I2C bus %d\n",
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CONFIG_STMPE811_I2CDEV);
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return -ENODEV;
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}
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/* Instantiate the STMPE811 driver */
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g_stmpe811config.handle =
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stmpe811_instantiate(dev,
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(struct stmpe811_config_s *)&g_stmpe811config);
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if (!g_stmpe811config.handle)
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{
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ierr("ERROR: Failed to instantiate the STMPE811 driver\n");
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return -ENODEV;
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}
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/* Initialize and register the I2C touchscreen device */
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ret = stmpe811_register(g_stmpe811config.handle,
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CONFIG_STMPE811_DEVMINOR);
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if (ret < 0)
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{
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ierr("ERROR: Failed to register STMPE driver: %d\n", ret);
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/* stm32_i2cbus_uninitialize(dev); */
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return -ENODEV;
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}
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}
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return OK;
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#else
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return -ENOSYS;
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#endif
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}
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#endif /* CONFIG_INPUT_STMPE811 */
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