App blinky: change to use platform independent driver

Makefile

@@ -33,6 +33,7 @@ OPT = 3
 C_FLAGS += -O$(OPT) -g$(OPT)
 C_FLAGS += -Wall -Werror
 C_FLAGS += -ffunction-sections -fdata-sections -fno-strict-aliasing
+C_FLAGS += -DPLATFORM_$(PLATFORM)
 
 LIBS += c nosys m
 

include/board.h

@@ -0,0 +1,8 @@
+#ifndef __BOARD_H__
+#define __BOARD_H__
+
+#if defined(BOARD_PCA10040)
+    #include "platform/nrf52/nrf52-dk.h"
+#endif
+
+#endif

include/delay.h

@@ -0,0 +1,10 @@
+#ifndef __DELAY_H__
+#define __DELAY_H__
+
+#if defined(PLATFORM_nrf52)
+    #include "nrf_delay.h"
+
+    #define delay_ms    nrf_delay_ms
+#endif
+
+#endif

include/driver.h

@@ -0,0 +1,34 @@
+#ifndef __DRIVER_H__
+#define __DRIVER_H__
+
+#include <stdarg.h>
+
+struct driver;
+
+typedef int (*fp_open_t)(const struct driver *);
+typedef int (*fp_close_t)(const struct driver *);
+typedef int (*fp_read_t)(const struct driver *, char *, unsigned int);
+typedef int (*fp_write_t)(const struct driver *, const char *, unsigned int);
+typedef int (*fp_ioctl_t)(const struct driver *, unsigned int, unsigned int argc, va_list);
+
+struct driver_fp {
+    fp_open_t   open;
+    fp_close_t  close;
+    fp_read_t   read;
+    fp_write_t  write;
+    fp_ioctl_t  ioctl;
+};
+
+struct driver {
+    const char *name;
+    const struct driver_fp *fp;
+    const void *dev;
+};
+
+int drv_open(const struct driver *drv);
+int drv_close(const struct driver *drv);
+int drv_read(const struct driver *drv, char *buffer, unsigned int length);
+int drv_write(const struct driver *drv, const char *buffer, unsigned int length);
+int drv_ioctl(const struct driver *drv, unsigned int cmd, unsigned int argc, ...);
+
+#endif

include/gpio.h

@@ -0,0 +1,34 @@
+#ifndef __GPIO_H__
+#define __GPIO_H__
+
+#include <stdarg.h>
+
+#include "driver.h"
+
+#define IOCTL_CMD_SET_DIRECTION 0
+
+int gpio_open(const struct driver *drv);
+int gpio_close(const struct driver *drv);
+
+int gpio_read(const struct driver *drv, char *buffer, unsigned int len);
+int gpio_write(const struct driver *drv, const char *buffer, unsigned int len);
+
+enum direction {
+    IN = 0,
+    OUT
+};
+
+struct gpio {
+    int pin;
+    enum direction dir;
+};
+
+static const struct driver_fp gpio_fp = {
+    .open = gpio_open,
+    .close = gpio_close,
+    .read = gpio_read,
+    .write = gpio_write,
+    .ioctl = NULL
+};
+
+#endif

include/platform/nrf52/nrf52-dk.h

@@ -0,0 +1,52 @@
+#ifndef __NRF52_DK_H__
+#define __NRF52_DK_H__
+
+#include "driver.h"
+
+#include "gpio.h"
+
+// LED 1
+const struct gpio nrf_led_1 = {
+    .pin = 17,
+    .dir = OUT
+};
+const struct driver led_1 = {
+    .name = "LED1",
+    .fp = &gpio_fp,
+    .dev = &nrf_led_1
+};
+
+// LED 2
+const struct gpio nrf_led_2 = {
+    .pin = 18,
+    .dir = OUT
+};
+const struct driver led_2 = {
+    .name = "LED2",
+    .fp = &gpio_fp,
+    .dev = &nrf_led_2
+};
+
+// LED 3
+const struct gpio nrf_led_3 = {
+    .pin = 19,
+    .dir = OUT
+};
+const struct driver led_3 = {
+    .name = "LED3",
+    .fp = &gpio_fp,
+    .dev = &nrf_led_3
+};
+
+// LED 4
+const struct gpio nrf_led_4 = {
+    .pin = 20,
+    .dir = OUT
+};
+const struct driver led_4 = {
+    .name = "LED4",
+    .fp = &gpio_fp,
+    .dev = &nrf_led_4
+};
+
+#endif

src/application/blinky/main.c

@@ -1,77 +1,22 @@
-/**
- * Copyright (c) 2014 - 2019, Nordic Semiconductor ASA
- *
- * All rights reserved.
- *
- * 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, except as embedded into a Nordic
- *    Semiconductor ASA integrated circuit in a product or a software update for
- *    such product, 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 of Nordic Semiconductor ASA nor the names of its
- *    contributors may be used to endorse or promote products derived from this
- *    software without specific prior written permission.
- *
- * 4. This software, with or without modification, must only be used with a
- *    Nordic Semiconductor ASA integrated circuit.
- *
- * 5. Any software provided in binary form under this license must not be reverse
- *    engineered, decompiled, modified and/or disassembled.
- *
- * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
- *
- */
-/** @file
- *
- * @defgroup blinky_example_main main.c
- * @{
- * @ingroup blinky_example
- * @brief Blinky Example Application main file.
- *
- * This file contains the source code for a sample application to blink LEDs.
- *
- */
-
 #include <stdbool.h>
 #include <stdint.h>
-#include "nrf_delay.h"
-#include "boards.h"
 
-/**
- * @brief Function for application main entry.
- */
+#include "delay.h"
+#include "board.h"
+
 int main(void)
 {
-    /* Configure board. */
-    bsp_board_init(BSP_INIT_LEDS);
-
-    /* Toggle LEDs. */
-    while (true)
-    {
-        for (int i = 0; i < LEDS_NUMBER; i++)
-        {
-            bsp_board_led_invert(i);
-            nrf_delay_ms(500);
+    unsigned int cnt[4] = {0, 0, 0, 0};
+    const struct driver *leds[4] = {&led_1, &led_2, &led_3, &led_4};
+    for(unsigned int i = 0; i < 4; i++) {
+        drv_open(leds[i]);
+    }
+    while(true) {
+        for(unsigned int i = 0; i < 4; i++) {
+            char c = (cnt[i]++ % 2) + 0x30;
+            drv_write(leds[i], &c, 1);
+            delay_ms(500);
         }
     }
+    return 0;
 }
-
-/**
- *@}
- **/

src/driver.c

@@ -0,0 +1,67 @@
+#include <stdlib.h>
+#include <assert.h>
+
+#include "driver.h"
+
+int drv_open(const struct driver *drv)
+{
+    int res = -1;
+    assert(drv != NULL);
+
+    if(drv->fp->open) {
+        res = drv->fp->open(drv);
+    }
+
+    return res;
+}
+
+int drv_close(const struct driver *drv)
+{
+    int res = -1;
+    assert(drv != NULL);
+
+    if(drv->fp->close) {
+        res = drv->fp->close(drv);
+    }
+
+    return res;
+}
+
+int drv_read(const struct driver *drv, char *buffer, unsigned int length)
+{
+    int res = -1;
+    assert(drv != NULL);
+
+    if(drv->fp->read) {
+        res =  drv->fp->read(drv, buffer, length);
+    }
+
+    return res;
+}
+
+int drv_write(const struct driver *drv, const char *buffer, unsigned int length)
+{
+    int res = -1;
+    assert(drv != NULL);
+
+    if(drv->fp->write) {
+        res =  drv->fp->write(drv, buffer, length);
+    }
+
+    return res;
+}
+
+int drv_ioctl(const struct driver *drv, unsigned int cmd, unsigned int argc, ...)
+{
+    int res = -1;
+    assert(drv != NULL);
+
+    if(drv->fp->ioctl) {
+        va_list args;
+        va_start(args, argc);
+        res = drv->fp->ioctl(drv, cmd, argc, args);
+        va_end(args);
+    }
+
+    return res;
+}

src/platform/nrf52/gpio.c

@@ -0,0 +1,63 @@
+#include <assert.h>
+#include <stdint.h>
+#include <stddef.h>
+
+#include "gpio.h"
+
+#include "nrf_gpio.h"
+
+int gpio_open(const struct driver *drv)
+{
+    assert(NULL != drv);
+
+    struct gpio *this = (struct gpio *)(drv->dev);
+
+    if(this->dir == OUT) {
+        nrf_gpio_cfg_output((uint32_t)(this->pin));
+    nrf_gpio_pin_clear(this->pin);
+    }
+    // FIXME: implement input configuration
+
+    return 0;
+}
+
+int gpio_close(const struct driver *drv)
+{
+    assert(NULL != drv);
+
+    struct gpio *this = (struct gpio *)(drv->dev);
+    nrf_gpio_pin_clear(this->pin);
+
+    return 0;
+}
+
+int gpio_read(const struct driver *drv, char *buffer, unsigned int len)
+{
+    assert(NULL != drv);
+
+    if(len == 0) {
+        return 0;
+    }
+
+    struct gpio *this = (struct gpio *)(drv->dev);
+
+    uint32_t value = nrf_gpio_pin_read(this->pin);
+    buffer[0] = value + 0x30;   // ascii convert
+
+    return 1;
+}
+
+int gpio_write(const struct driver *drv, const char *buffer, unsigned int len)
+{
+    assert((NULL != drv) && (NULL != buffer));
+
+    if(len == 0) {
+        return 0;
+    }
+
+    struct gpio *this = (struct gpio *)(drv->dev);
+
+    nrf_gpio_pin_write(this->pin, buffer[0] - 0x30);
+
+    return 1;
+}