[BSP] Add GPIO driver for STM32F4

bsp/stm32f40x/drivers/gpio.c

+/*
+ * File      : gpio.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2015, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-01-05     Bernard      the first version
+ */
+
+#include <rthw.h>
+#include <rtdevice.h>
+#include <board.h>
+
+#ifdef RT_USING_PIN
+
+/* STM32 GPIO driver */
+struct pin_index
+{
+    int index;
+    uint32_t rcc;
+    GPIO_TypeDef *gpio;
+    uint32_t pin;
+};
+
+static const struct pin_index pins[] =
+{
+    { 0, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_7},
+    { 1, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_6},
+    { 2, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_8},
+    { 3, RCC_AHB1Periph_GPIOB, GPIOB, GPIO_Pin_11},
+    { 4, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_14},
+    { 5, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_13},
+    { 6, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_11},
+    { 7, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_9},
+
+    { 8, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_12},
+    { 9, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_13},
+    {10, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_14},
+    {11, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_15},
+    {12, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_6},
+    {13, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_5},
+
+    {14, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_8},
+    {15, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_9},
+    {16, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_5},
+    {17, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_6},
+    {18, RCC_AHB1Periph_GPIOB, GPIOB, GPIO_Pin_6},
+    {19, RCC_AHB1Periph_GPIOB, GPIOB, GPIO_Pin_7},
+    {20, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_9},
+    {21, RCC_AHB1Periph_GPIOA, GPIOA, GPIO_Pin_8},
+
+    {22, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_12},
+    {23, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_2},
+    {24, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_1},
+    {25, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_0},
+    {26, RCC_AHB1Periph_GPIOA, GPIOA, GPIO_Pin_9},
+    {27, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_13},
+    {28, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_15},
+    {29, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_12},
+    {30, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_10},
+    {31, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_8},
+    {32, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_7},
+    {33, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_4},
+    {34, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_3},
+    {35, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_2},
+    {36, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_1},
+    {37, RCC_AHB1Periph_GPIOE, GPIOE, GPIO_Pin_0},
+    {38, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_11},
+    {39, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_10},
+    {40, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_7},
+    {41, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_3},
+    {42, RCC_AHB1Periph_GPIOD, GPIOD, GPIO_Pin_4},
+    {43, RCC_AHB1Periph_GPIOB, GPIOB, GPIO_Pin_8},
+    {44, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_15},
+    {45, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_14},
+    {46, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_11},
+    {47, RCC_AHB1Periph_GPIOB, GPIOB, GPIO_Pin_5},
+    {48, RCC_AHB1Periph_GPIOC, GPIOC, GPIO_Pin_10},
+    {49, RCC_AHB1Periph_GPIOA, GPIOA, GPIO_Pin_15},
+    {50, RCC_AHB1Periph_GPIOB, GPIOB, GPIO_Pin_4},
+    {51, RCC_AHB1Periph_GPIOA, GPIOA, GPIO_Pin_7},
+    {52, RCC_AHB1Periph_GPIOB, GPIOB, GPIO_Pin_3},
+    {53, RCC_AHB1Periph_GPIOA, GPIOA, GPIO_Pin_4},
+};
+
+#define ITEM_NUM(items)	sizeof(items)/sizeof(items[0])
+const struct pin_index * get_pin(uint8_t pin)
+{
+    const struct pin_index* index;
+
+    if(pin < ITEM_NUM(pins))
+    {
+        index = &pins[pin];
+    }
+    else
+    {
+        index = RT_NULL;
+    }
+
+    return index;
+};
+
+void stm32_pin_write(rt_device_t dev, rt_base_t pin, rt_base_t value)
+{
+    const struct pin_index *index;
+
+    index = get_pin(pin);
+    if(index == RT_NULL)
+    {
+        return;
+    }
+
+    if(value == PIN_LOW)
+    {
+        GPIO_ResetBits(index->gpio, index->pin);
+    }
+    else
+    {
+        GPIO_SetBits(index->gpio, index->pin);
+    }
+}
+
+int stm32_pin_read(rt_device_t dev, rt_base_t pin)
+{
+    int value;
+    const struct pin_index *index;
+
+    value = PIN_LOW;
+
+    index = get_pin(pin);
+    if(index == RT_NULL)
+    {
+        return value;
+    }
+
+    if(GPIO_ReadInputDataBit(index->gpio, index->pin) == Bit_RESET)
+    {
+        value = PIN_LOW;
+    }
+    else
+    {
+        value = PIN_HIGH;
+    }
+
+    return value;
+}
+
+void stm32_pin_mode(rt_device_t dev, rt_base_t pin, rt_base_t mode)
+{
+    const struct pin_index *index;
+    GPIO_InitTypeDef  GPIO_InitStructure;
+
+    index = get_pin(pin);
+    if(index == RT_NULL)
+    {
+        return;
+    }
+
+    /* GPIO Periph clock enable */
+    RCC_AHB1PeriphClockCmd(index->rcc, ENABLE);
+
+    /* Configure GPIO_InitStructure */
+    GPIO_InitStructure.GPIO_Pin     = index->pin;
+    GPIO_InitStructure.GPIO_OType   = GPIO_OType_PP;
+    GPIO_InitStructure.GPIO_Speed   = GPIO_Speed_100MHz;
+
+    if(mode == PIN_MODE_OUTPUT)
+    {
+        /* output setting */
+        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
+        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
+    }
+    else if(mode == PIN_MODE_INPUT)
+    {
+        /* input setting: not pull. */
+        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
+        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
+    }
+    else if(mode == PIN_MODE_INPUT_PULLUP)
+    {
+        /* input setting: pull up. */
+        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
+        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
+    }
+    else
+    {
+        /* input setting:default. */
+        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
+        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
+    }
+    GPIO_Init(index->gpio, &GPIO_InitStructure);
+}
+
+const static struct rt_pin_ops _stm32_pin_ops = 
+{
+    stm32_pin_mode,
+    stm32_pin_write,
+    stm32_pin_read,
+};
+
+int stm32_hw_pin_init(void)
+{
+    rt_device_pin_register("pin", &_stm32_pin_ops, RT_NULL);
+    return 0;
+}
+INIT_BOARD_EXPORT(stm32_hw_pin_init);
+
+#endif

bsp/stm32f40x/drivers/gpio.h

+/*
+ * File      : gpio.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2015, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-01-05     Bernard      the first version
+ */
+#ifndef GPIO_H__
+#define GPIO_H__
+
+int stm32_hw_pin_init(void);
+
+#endif