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[文章]【HarmonyOS HiSpark AI Camera试用连载 】第六次情迷-鸿蒙OS的GPIO开发（点灯）

瑟寒凌风
2020-12-26 20:08:26
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谁？
我！
是你？
是我！
你终于来了！
我终于来了！
你终究是来了？
我终究是来了！
你来干什么!
我来点亮一个电灯泡！
本文由韦东山的源代码指导，感谢韦神！


驱动编写最开始肯定是控制gpio，查找原理图，发现有个LED0是接在gpio2_3这个引脚上的，果断选择点亮这个灯。
1.led原理图.jpg

从官方文档看，我们要确定gpio的管脚号
2.gpio.jpg
我们的引脚是gpio2_3所以引脚号是2*8+3=19，如此我们就可以开干。

在/vendor/hisi/hi35xx/hi3516dv300/config/device_info路径下，打开device_info.hcs文件,修改其中的内容
  1. platform :: host {
  2.             hostName = "platform_host";
  3.             priority = 50;

  5.             device_led :: device {
  6.                 device0 :: deviceNode {
  7.                     policy = 2;
  8.                     priority = 50;
  9.                     permission = 0644;
  10.                     moduleName = "HDF_PLATFORM_LED";
  11.                     serviceName = "led_service";
  12.                 }
  13.             }
复制代码
在目录/vendor/hisi/hi35xx/hi3516dv300/下新建driver/led文件夹,在led文件夹中新建led_drv.c和Makefile两个文件。

Led_drv.c中内容如下:
  1. #include <stdlib.h>
  2. #include <asm/io.h>
  3. #include <fs/fs.h>
  4. #include <fs_poll_pri.h>
  5. #include <los_queue.h>
  6. #include <poll.h>
  7. #include <user_copy.h>
  8. #include <securec.h>
  9. #include "gpio_if.h"
  10. #include "hdf_device_desc.h"
  11. #include "hdf_log.h"
  12. #include "osal_irq.h"
  13. #include "osal_mem.h"
  14. #include "osal_time.h"


  17. static int g_led_val = 0x87654321;
  18. uint16_t gpio = 19; /*待测试的GPIO管脚号 */

  20. static int led_open(FAR struct file *filep)
  21. {
  22.     HDF_LOGI("%s: called", __func__);
  23.     if (filep == NULL) {
  24.         HDF_LOGE("%s: fliep is null", __func__);
  25.         return HDF_ERR_INVALID_PARAM;
  26.     }
  27.     int32_t ret = GpioSetDir(gpio, GPIO_DIR_OUT);
  28.     if (ret != HDF_SUCCESS) {
  29.         HDF_LOGE("%s: set dir fail! ret:%dn", __func__, ret);
  30.         return ret;
  31.     }
  32.     return HDF_SUCCESS;
  33. }

  35. static int led_close(FAR struct file *filep)
  36. {
  37.     HDF_LOGI("%s: called", __func__);

  39.     if (filep == NULL) {
  40.         HDF_LOGE("%s: fliep is null", __func__);
  41.         return HDF_ERR_INVALID_PARAM;
  42.     }
  43.     GpioWrite(gpio, 0);//置高gpio
  44.     return HDF_SUCCESS;
  45. }

  47. static ssize_t led_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
  48. {
  49.         if (buflen == 4) {
  50.                 LOS_ArchCopyToUser(buffer, &g_led_val, 4);
  51.                 return 4;
  52.         }
  53.         return 0;
  54. }

  56. static ssize_t led_write(FAR struct file *filep, FAR const char *buffer, size_t buflen)
  57. {
  58.     if(buffer[0] == 0)
  59.         GpioWrite(gpio, 0);//置高gpio
  60.     else
  61.         GpioWrite(gpio, 1);//置高gpio
  62.         return 0;
  63. }

  65. static const struct file_operations_vfs g_ledDevOps = {
  66.     .open   = led_open,
  67.     .close  = led_close,
  68.     .read   = led_read,
  69.     .write  = led_write,
  70.     .seek   = NULL,
  71.     .ioctl  = NULL,
  72.     .mmap   = NULL,
  73.     .unlink = NULL,
  74. };


  77. int32_t led_dispatch(struct HdfDeviceIoClient *client, int cmdId, struct HdfSBuf *data, struct HdfSBuf *reply)
  78. {
  79.     (void)client;
  80.     (void)cmdId;
  81.     if (data == NULL || reply == NULL) {
  82.         HDF_LOGE("%s: param is null", __func__);
  83.         return HDF_FAILURE;
  84.     }

  86.         if (!HdfSbufWriteInt32(reply, g_led_val))
  87.         {
  88.         HDF_LOGE("%s: reply int32 fail", __func__);
  89.         }
  90.         
  91.     return HDF_SUCCESS;
  92. }

  94. int32_t led_bind(struct HdfDeviceObject *object)
  95. {
  96.     if (object == NULL) {
  97.         HDF_LOGE("%s: param is null", __func__);
  98.         return HDF_ERR_INVALID_PARAM;
  99.     }
  100.     static struct IDeviceIoService service = {
  101.         .object = {0},
  102.         .Dispatch = led_dispatch,
  103.     };
  104.     object->service = &service;
  105.     return HDF_SUCCESS;
  106. }

  108. int led_init(struct HdfDeviceObject *object)
  109. {
  110.     (void)object;
  111.     HDF_LOGI("%s: enter", __func__);
  112.     int ret = register_driver("/dev/led", &g_ledDevOps, 0666, NULL);
  113.     if (ret != 0) {
  114.         HDF_LOGE("%s: register led dev failed, ret %d", __func__, ret);
  115.         return HDF_FAILURE;
  116.     }
  117.     HDF_LOGI("%s: exit succ", __func__);
  118.     return HDF_SUCCESS;

  120. }

  122. struct HdfDriverEntry g_ledDevEntry = {
  123.     .moduleVersion = 1,
  124.     .moduleName = "HDF_PLATFORM_LED",
  125.     .Bind = led_bind,
  126.     .Init = led_init,
  127. };

  129. HDF_INIT(g_ledDevEntry);
  130. Makefile文件内容如下:
  131. include $(LITEOSTOPDIR)/config.mk
  132. include $(LITEOSTOPDIR)/../../drivers/hdf/lite/lite.mk

  134. MODULE_NAME := $(notdir $(shell pwd))

  136. LOCAL_SRCS :=  led_drv.c

  138. LOCAL_FLAGS :=  -I$(LITEOSTOPDIR)/../../drivers/hdf/frameworks/include/osal
  139.                 -I$(LITEOSTOPDIR)/../../drivers/hdf/frameworks/include/core
  140.                 -I$(LITEOSTOPDIR)/../../drivers/hdf/frameworks/ability/***uf/include
  141.                 -I$(LITEOSTOPDIR)/../../drivers/hdf/frameworks/utils/include
  142.                 -I$(LITEOSTOPDIR)/../../drivers/hdf/lite/include/host

  144. LOCAL_CFLAGS += -fstack-protector-strong

  146. include $(HDF_DRIVER)
复制代码
在目录/vendor/huawei/hdf/hdf_vendor.mk中,修改.mk文件，如截图所示
3.截图.jpg
然后编写测试程序

在源码根目录建立myapp文件夹，新建led_test.c文件,文件内容如下
  1. #include "hdf_log.h"
  2. #include "osal_mem.h"
  3. #include "hdf_io_service_if.h"
  4. #include <sys/types.h>
  5. #include <sys/stat.h>
  6. #include <fcntl.h>
  7. #include <string.h>
  8. #include <unistd.h>


  11. int main(int argc, char **argv)
  12. {

  14.         if (argc != 2)
  15.         {
  16.                 printf("Usage: %s <service | /dev/led>n", argv[0]);
  17.                 return -1;
  18.         }
  19.         int fd = open(argv[1], O_RDWR);
  20.         int val[5] = {0};
  21.         
  22.         if (fd < 0) {
  23.                 printf("can not open %sn", argv[1]);
  24.                 return -1;
  25.         }
  26.         while(1)
  27.         {
  28.                 val[0] = !val[0];
  29.                 printf("led:%dn", val[0]);
  30.                 write(fd,val,5);
  31.                 sleep(1);
  32.         }
  33.         return 0;
  34. }
复制代码
修改配置文件,准备编译

修改根目录下/drivers/hdf/lite/manager/BUILD.gn文件如下
  1. import("//build/lite/config/component/lite_component.gni")

  3. HDF_FRAMEWORKS = "//drivers/hdf/frameworks"

  5. shared_library("hdf_core") {
  6.     sources = [
  7.         "$HDF_FRAMEWORKS/core/shared/src/hdf_io_service.c",
  8.         "$HDF_FRAMEWORKS/ability/***uf/src/hdf_***uf.c",
  9.         "../adapter/syscall/src/hdf_syscall_adapter.c"
  10.     ]

  12.     include_dirs = [
  13.         "../adapter/syscall/include",
  14.         "../adapter/vnode/include",
  15.         "$HDF_FRAMEWORKS/core/shared/include",
  16.         "$HDF_FRAMEWORKS/core/host/include",
  17.         "$HDF_FRAMEWORKS/core/manager/include",
  18.         "$HDF_FRAMEWORKS/ability/***uf/include",
  19.         "$HDF_FRAMEWORKS/include/core",
  20.         "$HDF_FRAMEWORKS/include/utils",
  21.         "$HDF_FRAMEWORKS/utils/include",
  22.         "$HDF_FRAMEWORKS/include/osal",
  23.         "//third_party/bounds_checking_function/include",
  24.     ]

  26.     deps = [
  27.         "//drivers/hdf/lite/adapter/osal/posix:hdf_posix_osal",
  28.         "//third_party/bounds_checking_function:libsec_shared",
  29.     ]

  31.     defines = [
  32.         "__USER__",
  33.     ]

  35.     cflags = [
  36.         "-Wall",
  37.         "-Wextra",
  38.         "-Werror",
  39.         "-fsigned-char",
  40.         "-fno-common",
  41.         "-fno-strict-aliasing",
  42.     ]
  43. }

  45. executable("led_test") {
  46.     sources = [
  47.         "//myapp/led_test.c"
  48.     ]

  50.     include_dirs = [
  51.         "../adapter/syscall/include",
  52.         "../adapter/vnode/include","$HDF_FRAMEWORKS/ability/***uf/include",
  53.         "$HDF_FRAMEWORKS/core/shared/include",
  54.         "$HDF_FRAMEWORKS/core/host/include",
  55.         "$HDF_FRAMEWORKS/core/master/include",
  56.         "$HDF_FRAMEWORKS/include/core",
  57.         "$HDF_FRAMEWORKS/include/utils",
  58.         "$HDF_FRAMEWORKS/utils/include",
  59.         "$HDF_FRAMEWORKS/include/osal",
  60.         "//third_party/bounds_checking_function/include",
  61.     ]

  63.     deps = [
  64.         "//drivers/hdf/lite/manager:hdf_core",
  65.         "//drivers/hdf/lite/adapter/osal/posix:hdf_posix_osal",
  66.     ]

  68.     public_deps = [
  69.         "//third_party/bounds_checking_function:libsec_shared",
  70.     ]
  71.     defines = [
  72.         "__USER__",
  73.     ]

  75.     cflags = [
  76.         "-Wall",
  77.         "-Wextra",
  78.         "-Werror",
  79.     ]
  80. }

  82. lite_component("hdf_manager") {
  83.     features = [
  84.         ":hdf_core",
  85.         ":led_test",
  86.     ]
  87. }
复制代码
然后输入编译指令
  1. python build.py ipcamera_hi3516dv300 -b debug
复制代码

下载运行：进入开发板的bin目录，输入指令./led_test ../dev/led，即可看到灯在闪烁
4..jpg

code-1.0-led.zip
(33.68 KB, 下载次数: 4)

led源码
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