本帖最后由 jf_64182030 于 2020-12-29 23:35 编辑
参考文档:
参考该源码实现类似linux的文件操作接口:file_opera
tions_vfs。
在
论坛里搜了一下,发现这位发烧友也是采用了file_operations_vfs的方式实现gpio控制,操作led灯的亮灭。
前言
现在有两种方式实现GPIO的控制:
方式一:通过register_driver的方式,注册file_operations_vfs的一些驱动操作接口,比如open、close、read、write、ioctl等等。这个方法几乎和Linux的驱动接口一模一样,很方便有Linux驱动经验的人员开发。
方式二:通过hdf服务的方式,应用通过服务名称获取服务句柄,然后通过API接口直接获取或者订阅该服务对应的驱动事件。用户空间将数据放在一段共享内存(HdfSBuf),然后将数据和cmd编号发送给内核空间的驱动;驱动也可以触发一个事件,通过一段共享内存(HdfSBuf)将内核空间的数据传递给用户空间,该事件会通知用户空间回调函数进行相应处理。
方式一的方法已经有官方和发烧友的参考例程了,这里就不单独来写了,本文将基于方式二进行说明。看起来方式一和方式二似乎是可以共存的,这个测试可能要放到后面的追加文章了。而且还有驱动如何从hcs配置文件里获取板级配置也还待确定一下。
1. 硬件
(1) LED_light/GPIO2_3
灯板上的D4 LED。
(2) GPIO5_1/UART4_TXD
补光灯。
(3) LSADC_CH0/GPIO10_3
红外检测。
首先需要选取一个空闲的GPIO管脚,本例程基于Hi3516DV300某
开发板,GPIO管脚选择GPIO10_3,换算成GPIO号为83。
Hi3516DV300控制器管理12组GPIO管脚,每组8个。
GPIO号 = GPIO组索引 (0~11) * 每组GPIO管脚数(8) + 组内偏移
举例:GPIO10_3的GPIO号 = 10 * 8 + 3 = 83
编写软件:
2. 在HDF框架的配置文件中添加该驱动的配置信息,如下所示:
$ vi ~/harmony/sdk/vendor/hisi/hi35xx/hi3516dv300/config/device_info/device_info.hcs
- sample_host :: host {
- hostName = "sample_host";
- ...
- }
- +++
- gpio_host :: host {
- hostName = "gpio_host";
- gpio_device :: device {
- device0 :: deviceNode {
- policy = 2;
- priority = 100;
- preload = 0;
- permission = 0664;
- moduleName = "gpio_driver";
- serviceName = "gpio_service";
- }
- }
- }
- +++
- platform :: host {
3. 编写驱动代码
3.1 基于HDF框架编写的gpio驱动代码如下:
$ mkdir -p ~/harmony/sdk/vendor/huawei/hdf/sample/platform/gpio-sample
$ vi ~/harmony/sdk/vendor/huawei/hdf/sample/platform/gpio-sample/gpio_sample.c
- #include
- #include
- #include
- #include "hdf_log.h"
- #include "hdf_base.h"
- #include "hdf_device_desc.h"
- #include "gpio_if.h"
- #include "osal_io.h"
- #include "osal_irq.h"
- #include "osal_time.h"
- #define HDF_LOG_TAG gpio_driver
- // 设置cmd编号,类似于Linux的ioctl命令码。
- #define CMD_GPIO_LDR_TEST 100
- #define CMD_GPIO_LED_TEST 101
- #define CMD_GPIO_FILL_LIGHT 102
- // GPIO NUM
- #define GPIO_NUM_LDR_GPIO10_3 83 // 10*8+3
- #define GPIO_NUM_LED_GPIO2_3 19 // 2*8+3
- #define GPIO_NUM_FILL_LIGHT_GPIO5_1 41 // 5*8+1
- static uint32_t g_irqCnt;
- // 中断服务函数
- static int32_t TestCaseGpioIrqHandler(uint16_t gpio, void *data)
- {
- HDF_LOGE("%s: irq triggered! on gpio:%u, data=%p", __func__, gpio, data);
- g_irqCnt++; // 如果中断服务函数触发执行,则将全局中断计数加1
- return GpioDisableIrq(gpio);
- }
- // 测试用例函数
- static int32_t gpio_test_ldr_irq_edge(void)
- {
- int32_t ret;
- uint16_t valRead;
- uint16_t mode;
- uint16_t gpio = GPIO_NUM_LDR_GPIO10_3; // 待测试的GPIO管脚号
- uint32_t timeout;
- // 将管脚方向设置为输出
- ret = GpioSetDir(gpio, GPIO_DIR_OUT);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("%s: set dir fail! ret:%d
- ", __func__, ret);
- return ret;
- }
- // 先禁止该管脚中断
- ret = GpioDisableIrq(gpio);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("%s: disable irq fail! ret:%d
- ", __func__, ret);
- return ret;
- }
- // 为管脚设置中断服务函数,触发模式为上升沿和下降沿共同触发
- mode = OSAL_IRQF_TRIGGER_RISING | OSAL_IRQF_TRIGGER_FALLING;
- HDF_LOGE("%s: mode:%0x
- ", __func__, mode);
- ret = GpioSetIrq(gpio, mode, TestCaseGpioIrqHandler, NULL);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("%s: set irq fail! ret:%d
- ", __func__, ret);
- return ret;
- }
- // 使能此管脚中断
- ret = GpioEnableIrq(gpio);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("%s: enable irq fail! ret:%d
- ", __func__, ret);
- (void)GpioUnSetIrq(gpio);
- return ret;
- }
- g_irqCnt = 0; // 清除全局计数器
- timeout = 0; // 等待时间清零
- // 等待此管脚中断服务函数触发,等待超时时间为1000毫秒
- while (g_irqCnt <= 0 && timeout < 1000) {
- (void)GpioRead(gpio, &valRead);
- (void)GpioWrite(gpio, (valRead == GPIO_VAL_LOW) ? GPIO_VAL_HIGH : GPIO_VAL_LOW);
- HDF_LOGE("%s: wait irq timeout:%u
- ", __func__, timeout);
- OsalMDelay(200); // wait for irq trigger
- timeout += 200;
- }
- (void)GpioUnSetIrq(gpio);
- return (g_irqCnt > 0) ? HDF_SUCCESS : HDF_FAILURE;
- }
- static void gpio_test_led_blink(uint16_t gpio)
- {
- int32_t ret;
- int i = 0;
- // 将管脚方向设置为输出
- ret = GpioSetDir(gpio, GPIO_DIR_OUT);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("%s: set dir fail! ret:%d
- ", __func__, ret);
- }
- //HDF_LOGE("
- GpioSetDir GPIO_DIR_OUT");
- for (i = 0; i < 3; i++) {
- ret = GpioWrite(gpio, GPIO_VAL_HIGH);
- if (ret != 0) {
- HDF_LOGE("GpioWrite: failed, ret %d
- ", ret);
- }
- //HDF_LOGE("GpioWrite GPIO_VAL_HIGH");
- //OsalMDelay(500); // 500ms, but OsalMDelay work is abnormal.
- OsalMSleep(500);
-
- ret = GpioWrite(gpio, GPIO_VAL_LOW);
- if (ret != 0) {
- HDF_LOGE("GpioWrite: failed, ret %d
- ", ret);
- }
- //HDF_LOGE("GpioWrite GPIO_VAL_LOW");
- //OsalMDelay(500); // 500ms
- OsalMSleep(500);
- }
- }
- // Dispatch是驱动中用来处理用户态发下来的消息的函数。
- static int32_t GpioSampleDriverDispatch(struct HdfDeviceIoClient *deviceIoClient, int id, struct HdfSBuf *data, struct HdfSBuf *reply)
- {
- HDF_LOGE("%s: received cmd %d", __func__, id);
- switch (id) {
- case CMD_GPIO_LDR_TEST: { // 通常会采用switch case的方式来写。
- const char *readData = HdfSbufReadString(data); // 内核从用户空间获取数据,类似Linux的copy_from_user。
- if (readData != NULL) {
- HDF_LOGE("%s: read data is: %s", __func__, readData); // 内核打印从用户空间独到的数据。
- }
-
- // GPIO中断检测
- gpio_test_ldr_irq_edge();
-
- // 将向用户空间返回内容修改为字符串
- char *sendData = "come from kernel sapce: CMD_GPIO_LDR_TEST";
- if (!HdfSbufWriteString(reply, sendData)) {
- HDF_LOGE("%s: fail to write ***uf", __func__);
- }
-
- // 通HdfDeviceSendEvent函数触发用户空间获取驱动上报数据。
- return HdfDeviceSendEvent(deviceIoClient->device, id, data);
- }
- case CMD_GPIO_LED_TEST: {
- const char *readData = HdfSbufReadString(data); // 内核从用户空间获取数据,类似Linux的copy_from_user。
- if (readData != NULL) {
- HDF_LOGE("%s: read data is: %s", __func__, readData); // 内核打印从用户空间独到>的数据。
- }
- // GPIO test
- gpio_test_led_blink(GPIO_NUM_LED_GPIO2_3);
- // 将向用户空间返回内容修改为字符串
- char *sendData = "come from kernel sapce: CMD_GPIO_LED_TEST";
- if (!HdfSbufWriteString(reply, sendData)) {
- HDF_LOGE("%s: fail to write ***uf", __func__);
- }
- // 通HdfDeviceSendEvent函数触发用户空间获取驱动上报数据。
- return HdfDeviceSendEvent(deviceIoClient->device, id, data);
- }
- case CMD_GPIO_FILL_LIGHT: {
- const char *readData = HdfSbufReadString(data); // 内核从用户空间获取数据,类似Linux的copy_from_user。
- if (readData != NULL) {
- HDF_LOGE("%s: read data is: %s", __func__, readData); // 内核打印从用户空间独到>的数据。
- }
- // GPIO test
- gpio_test_led_blink(GPIO_NUM_FILL_LIGHT_GPIO5_1);
- // 将向用户空间返回内容修改为字符串
- char *sendData = "come from kernel sapce: CMD_GPIO_FILL_LIGHT";
- if (!HdfSbufWriteString(reply, sendData)) {
- HDF_LOGE("%s: fail to write ***uf", __func__);
- }
- // 通HdfDeviceSendEvent函数触发用户空间获取驱动上报数据。
- return HdfDeviceSendEvent(deviceIoClient->device, id, data);
- }
- default: {
- HDF_LOGE("no such cmd id");
- break;
- }
- }
- return HDF_FAILURE;
- }
- // 驱动资源释放的接口,本例未分配需要回收的资源,因此为空。
- static void GpioSampleDriverRelease(struct HdfDeviceObject *deviceObject)
- {
- // release resources here
- return;
- }
- // 用户态获取驱动的服务,获取该服务之后通过服务中的Dispatch方法向驱动发送消息。
- static int GpioSampleDriverBind(struct HdfDeviceObject *deviceObject)
- {
- if (deviceObject == NULL) {
- return HDF_FAILURE;
- }
- static struct IDeviceIoService testService = {
- // Dispatch是用来处理用户态发下来的消息。
- .Dispatch = GpioSampleDriverDispatch,
- };
- deviceObject->service = &testService;
- return HDF_SUCCESS;
- }
- // 驱动自身业务初始的接口。
- static int GpioSampleDriverInit(struct HdfDeviceObject *deviceObject)
- {
- if (deviceObject == NULL) {
- HDF_LOGE("%s::ptr is null!", __func__);
- return HDF_FAILURE;
- }
- HDF_LOGE("gpio driver Init success");
- return HDF_SUCCESS;
- }
- // 定义驱动入口的对象,必须为HdfDriverEntry(在hdf_device_desc.h中定义)类型的全局变量。
- struct HdfDriverEntry g_gpioSampleDriverEntry = {
- .moduleVersion = 1,
- .moduleName = "gpio_driver", // 驱动的关键名称。
- .Bind = GpioSampleDriverBind,
- .Init = GpioSampleDriverInit,
- .Release = GpioSampleDriverRelease,
- };
- // 调用HDF_INIT将驱动入口注册到HDF框架中,在加载驱动时HDF框架会先调用Bind函数,
- // 再调用Init函数加载该驱动,当Init调用异常时,HDF框架会调用Release释放驱动资源并退出。
- HDF_INIT(g_gpioSampleDriverEntry);
3.2 创建Kconfig
$ cd ~/harmony/sdk/vendor/huawei/hdf/sample/platform/gpio-sample
$ touch Kconfig && vi Kconfig
- # Copyright (c) 2020 Huawei Device Co., Ltd.
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- config DRIVERS_HDF_PLATFORM_GPIO_SAMPLE
- bool "Enable HDF platform GPIO sample driver"
- default n
- depends on DRIVERS_HDF_PLATFORM
- help
- Answer Y to enable HDF platform GPIO sample driver.
修改上层Kconfig
$ vi ~/harmony/sdk/vendor/huawei/hdf/Kconfig
- source "../../vendor/huawei/hdf/片 sample/platform/gpio-sample/Kconfig"
3.3 创建Makefile
$ cd ~/harmony/sdk/vendor/huawei/hdf/sample/platform/gpio-sample
$ touch Makefile && vi Makefile
- # Copyright (c) 2020 Huawei Device Co., Ltd.
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- include $(LITEOSTOPDIR)/config.mk
- include $(LITEOSTOPDIR)/../../drivers/hdf/lite/lite.mk
- MODULE_NAME := gpio_sample
- LOCAL_CFLAGS += $(HDF_INCLUDE)
- LOCAL_SRCS += gpio_sample.c
- # 警告需要关掉,不然unused的变量都会报错!
- #LOCAL_CFLAGS += -fstack-protector-strong -Wextra -Wall -Werror
- LOCAL_CFLAGS += -fstack-protector-strong
- include $(HDF_DRIVER)
3.4 将驱动模块加入编译
$ vi ~/harmony/sdk/vendor/huawei/hdf/hdf_vendor.mk
- LITEOS_BASELIB += -lgpio_sample
- LIB_SUBDIRS += $(VENDOR_HDF_DRIVERS_ROOT)/sample/platform/gpio-sample
LITEOS_BASELIB中的hdf_sample为Makefile里的MODULE_NAME名字。
3.5 驱动编译
3.5.1 手动使能驱动源码编译:
$ vi ~/harmony/sdk/kernel/liteos_a/tools/build/config/debug/hi3516dv300_clang.config
- LOSCFG_DRIVERS_HDF_LCD=y
- LOSCFG_DRIVERS_HDF_LCD_ICN9700=y
- LOSCFG_DRIVERS_HDF_PLATFORM_HDF_SAMPLE=y
- +LOSCFG_DRIVERS_HDF_PLATFORM_GPIO_SAMPLE=y
让修改生效:
$ cd ~/harmony/sdk/kernel/liteos_a/
$ ./build.sh hi3516dv300 clang debug
- sh param:hi3516dv300,clang,debug
3.5.2 编译
$ cd ~/harmony/sdk/
$ python build.py ipcamera_hi3516dv300 -b debug
- ohos ipcamera_hi3516dv300 build success!
3.5.3 查看驱动模块gpio_sample存放位置:
~/harmony/sdk$ find -name gpio_sample
- ./out/ipcamera_hi3516dv300/obj/kernel/liteos_a/obj/vendor/huawei/hdf/sample/platform/gpio_sample
4. 编写用户程序和驱动交互代码
4.1 基于HDF框架编写的用户态程序和驱动交互的代码如下:
$ mkdir -p ~/harmony/sdk/vendor/huawei/hdf/sample/platform/gpio-sample/app
$ vi ~/harmony/sdk/vendor/huawei/hdf/sample/platform/gpio-sample/app/gpio_sample_app.c
- #include
- #include
- #include "hdf_log.h"
- #include "hdf_***uf.h"
- #include "hdf_io_service_if.h"
- #include
- #include
- #include
- #include
- #define HDF_LOG_TAG "gpio_sample_test"
- #define GPIO_SERVICE_NAME "gpio_service" // 服务的关键名称。
- // 设置cmd编号,类似于Linux的ioctl命令码。
- #define CMD_GPIO_LDR_TEST 100
- #define CMD_GPIO_LED_TEST 101
- #define CMD_GPIO_FILL_LIGHT 102
- // GPIO NUM
- #define GPIO_NUM_LDR_GPIO10_3 83 // 10*8+3
- #define GPIO_NUM_LED_GPIO2_3 19 // 2*8+3
- #define GPIO_NUM_FILL_LIGHT_GPIO5_1 41 // 5*8+1
- int g_replyFlag = 0;
- // 用户空间回调函数,驱动通过HdfDeviceSendEvent发送事件后,该函数将处理返回数据。
- static int OnDevEventReceived(void *priv, uint32_t id, struct HdfSBuf *data)
- {
- const char *string = HdfSbufReadString(data);
- if (string == NULL) {
- HDF_LOGE("fail to read string in event data");
- g_replyFlag = 1;
- return HDF_FAILURE;
- }
- HDF_LOGE("user space received:");
- HDF_LOGE("%s: dev event received: %u %s", (char *)priv, id, string);
- g_replyFlag = 1;
- return HDF_SUCCESS;
- }
- // 用户空间给内核驱动发送数据
- static int SendEvent(struct HdfIoService *serv, char *eventData, int cmd)
- {
- int ret = 0;
- // 获取系统分配的data ***uf。
- struct HdfSBuf *data = HdfSBufObtainDefaultSize();
- if (data == NULL) {
- HDF_LOGE("fail to obtain ***uf data");
- return 1;
- }
- // 获取系统分配的reply ***uf。
- struct HdfSBuf *reply = HdfSBufObtainDefaultSize();
- if (reply == NULL) {
- HDF_LOGE("fail to obtain ***uf reply");
- ret = HDF_DEV_ERR_NO_MEMORY;
- goto out;
- }
- // 将用户空间目标数据放到***uf。
- if (!HdfSbufWriteString(data, eventData)) {
- HDF_LOGE("fail to write ***uf");
- ret = HDF_FAILURE;
- goto out;
- }
- // 通过驱动服务提供的Dispatch实现用户态应用和内核态驱动的信息交互。
- switch (cmd) {
- case 1: {
- ret = serv->dispatcher->Dispatch(&serv->object, CMD_GPIO_LDR_TEST, data, reply);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("fail to send service call");
- goto out;
- }
- break;
- }
- case 2: {
- ret = serv->dispatcher->Dispatch(&serv->object, CMD_GPIO_LED_TEST, data, reply);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("fail to send service call");
- goto out;
- }
- break;
- }
- case 3: {
- ret = serv->dispatcher->Dispatch(&serv->object, CMD_GPIO_FILL_LIGHT, data, reply);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("fail to send service call");
- goto out;
- }
- break;
- }
- default: {
- HDF_LOGE("no such cmd");
- break;
- }
- }
- // 将***uf中获取到的字符串数据放到用户空间变量中。
- const char *replyData = HdfSbufReadString(reply);
- if (replyData == NULL) {
- HDF_LOGE("fail to get service call reply");
- ret = HDF_ERR_INVALID_OBJECT;
- goto out;
- }
- HDF_LOGE("Get reply is: %s", replyData);
- out:
- HdfSBufRecycle(data); // 释放用于数据中转的***uf
- HdfSBufRecycle(reply); // 释放用于数据中转的***uf
- return ret;
- }
- int main(int argc, char **argv)
- {
- char *sendData = "come from user sapce: default event info";
- if (argc != 2) {
- HDF_LOGE("Usage:
- ./bin/gpio_sample_app 1 CMD_GPIO_LDR_TEST
- ./bin/gpio_sample_app 2 CMD_GPIO_LED_TEST
- ./bin/gpio_sample_app 3 CMD_GPIO_FILL_LIGHT");
- return HDF_FAILURE;
- }
- // 用户态获取驱动的服务,获取该服务之后通过服务中的Dispatch方法向驱动发送消息。
- struct HdfIoService *serv = HdfIoServiceBind(GPIO_SERVICE_NAME, 0);
- if (serv == NULL) {
- HDF_LOGE("fail to get service %s", GPIO_SERVICE_NAME);
- return HDF_FAILURE;
- }
- // 注册订阅驱动服务的回调函数。
- static struct HdfDevEventlistener listener = {
- .callBack = OnDevEventReceived,
- .priv ="Service0"
- };
- // 当对驱动(同一个host)加载的时机不感知时,可以通过HDF框架提供的订阅机制来订阅该驱动。
- if (HdfDeviceRegisterEventListener(serv, &listener) != HDF_SUCCESS) {
- HDF_LOGE("fail to register event listener");
- return HDF_FAILURE;
- }
- // 用户空间给内核驱动发送数据
- HDF_LOGE("user space send:");
- HDF_LOGE("cmd: %s, send data is: %s", argv[1], sendData);
- if (SendEvent(serv, sendData, atoi(argv[1]))) {
- HDF_LOGE("fail to send event");
- return HDF_FAILURE;
- }
- /* wait for event receive event finishing */
- while (g_replyFlag == 0) {
- sleep(1);
- }
- // 用户态程序注册接收驱动上报事件的操作方法。
- if (HdfDeviceUnregisterEventListener(serv, &listener)) {
- HDF_LOGE("fail to unregister listener");
- return HDF_FAILURE;
- }
- // 释放驱动服务。
- HdfIoServiceRecycle(serv);
- return HDF_SUCCESS;
- }
4.2 编写编译APP源码的BUILD.gn文件
$ vi ~/harmony/sdk/vendor/huawei/hdf/sample/platform/gpio-sample/app/BUILD.gn
- # Copyright (c) 2020 Huawei Device Co., Ltd.
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- import("//build/lite/config/component/lite_component.gni")
- import("//build/lite/ndk/ndk.gni")
- HDF_FRAMEWORKS = "//drivers/hdf/frameworks"
- executable("gpio_sample_app") {
- sources = [
- "gpio_sample_app.c"
- ]
- include_dirs = [
- "$HDF_FRAMEWORKS/ability/***uf/include",
- "$HDF_FRAMEWORKS/core/shared/include",
- "$HDF_FRAMEWORKS/core/host/include",
- "$HDF_FRAMEWORKS/core/master/include",
- "$HDF_FRAMEWORKS/include/core",
- "$HDF_FRAMEWORKS/include/utils",
- "$HDF_FRAMEWORKS/utils/include",
- "$HDF_FRAMEWORKS/include/osal",
- "//third_party/bounds_checking_function/include",
- ]
- deps = [
- "//drivers/hdf/lite/manager:hdf_core",
- "//drivers/hdf/lite/adapter/osal/posix:hdf_posix_osal",
- ]
- public_deps = [
- "//third_party/bounds_checking_function:libsec_shared",
- ]
- defines = [
- "__USER__",
- ]
- cflags = [
- "-Wall",
- "-Wextra",
- ]
- }
4.3 将hdf_sample_app.c加入编译
$ vi ~/harmony/sdk/build/lite/product/ipcamera_hi3516dv300.json
- {
- "name": "hdf",
- "component": [
- { "name": "posix", "dir": "//drivers/hdf/lite/posix:hdf_posix", "features":[] },
- { "name": "manager", "dir": "//drivers/hdf/lite/manager:hdf_manager", "features":[] },
- { "name": "wifi", "dir": "//vendor/huawei/hdf/wifi:wifi_firmware", "features":[] },
- { "name": "display", "dir": "//vendor/huawei/hdf/display/hdi:hdi_display", "features":[] },
- { "name": "input", "dir": "//vendor/huawei/hdf/input/hdi:hdi_input", "features":[] },
- { "name": "hdf_sample", "dir": "//vendor/huawei/hdf/sample/platform/uart:hello_uart_sample", "features":[] },
- { "name": "hdf_sample_app", "dir": "//vendor/huawei/hdf/sample/platform/hdf-sample/app:hdf_sample_app", "features":[] },
- + { "name": "gpio_sample_app", "dir": "//vendor/huawei/hdf/sample/platform/gpio-sample/app:gpio_sample_app", "features":[] }
- ]
- },
4.4 应用编译
$ python build.py ipcamera_hi3516dv300 -b debug
$ vi out/ipcamera_hi3516dv300/build.log
- [1159/1348] clang obj/vendor/huawei/hdf/sample/platform/gpio-sample/app/gpio_sample_app.o
- [1162/1348] LLVM LINK ./bin/gpio_sample_app
通过上面的编译日志可以找到gpio_sample_app应用放在了系统的/bin目录:
5. 烧录:
5.1 将系统bin文件拷贝到Windows共享目录中:
$ rm /mnt/hgfs/proj-harmony/images/out/ -rf
$ cp -rf out/ /mnt/hgfs/proj-harmony/images/
5.2 在HiTool工具中依次填入OHOS_Image.bin、rootfs.img、userfs.img的文件位置
E:Share_Spaceproj-harmonyimagesoutipcamera_hi3516dv300
操作流程如下:
解决windows-x86-64的PL2303驱动开机后无法使用的办法:每次开机后,在设备管理中找到有问题的设备,鼠标右键先卸载驱动,安装USB-to-Serial Comm Port.exe,要注意的是需要赶在驱动失效前用HiTool将串口占用,系统就不会提示驱动有问题了。
修改一下分区长度:
点击“烧写”按键后,控制台会提示重启目标板,重启后,系统就自动进入烧写了。
单板初次启动需要修改启动参数,重新上电后登陆会进入uboot中,如果分区位置没有变化则不用执行下面修改启动参数的指令。
hisilicon # setenv bootcmd "mmc read 0x0 0x80000000 0x800 0x3000; go 0x80000000";
hisilicon # setenv bootargs "console=ttyAMA0,115200n8 root=emmc fstype=vfat rootaddr=7M rootsize=15M rw";
hisilicon # saveenv
hisilicon # reset
重启后进入系统。
注释:表示设置启动参数,输出模式为串口输出,波特率为115200,数据位8,rootfs挂载于emmc器件,文件系统类型为vfat,“rootaddr=6M rootsize=14M rw”处对应填入rootfs.img的烧写起始位置与长度,此处与新增rootfs.img文件时所填大小必须相同。
6. 测试
在根目录下,在命令行输入下面命令执行写入的demo程序,显示成功结果如下所示。没执行一次gpio_sample_app将会触发1s时长的红外检测,超时将会自动退出检测。
- OHOS # ./bin/gpio_sample_app
- // 用户空间给内核驱动发送数据
- [HDF:E/"gpio_sample_test"]user space send:
- [HDF:E/"gpio_sample_test"]cmd: 1, send data is: come from user sapce: default event info
- // 被驱动中用来处理用户态发下来的消息的函数HdfSampleDriverDispatch接收到
- [ERR][HDF:E/gpio_driver]GpioSampleDriverDispatch: received cmd 100
- [ERR][HDF:E/gpio_driver]GpioSampleDriverDispatch: read data is: come from user sapce: default event info
- // gpio中断测试,此时需要将手放到LDR1的前面遮挡一次触发中断,否则驱动将会超时退出。
- // 设置模式:双边沿触发
- [ERR][HDF:E/gpio_driver]gpio_test_ldr_irq_edge: mode:3
- // TestCaseGpioIrqHandler()这个回调函数被执行,说明检测到中断
- [ERR][HDF:E/gpio_driver]TestCaseGpioIrqHandler: irq triggered! on gpio:83, data=(nil)
- // 在1000ms超时前已经检测到gpio中断
- [ERR][HDF:E/gpio_driver]gpio_test_ldr_irq_edge: wait irq timeout:0
- // 用户空间收到内核空间返回的数据
- [HDF:E/"gpio_sample_test"]Get reply is: come from kernel sapce: CMD_GPIO_LDR_TEST
- [HDF:E/"gpio_sample_test"]user space received:
- [HDF:E/"gpio_sample_test"]Service0: dev event received: 100 come from user sapce: default event info
- [HDF:E/hdf_syscall_adapter]event listener task exit
打印结果的截图:
帮助信息:
gpio中断检测成功:
gpio中断检测超时失败:
D4-LED控制:此时D4和处理器所在板子上的两颗绿色LED会闪烁三次。
补光灯控制:此时两颗红色补光灯会闪烁三次,之所以出现红色可能是该灯需要pwm控制,然后直接控制电平时输入电流太小导致的,这个也暂时没去验证,反正能亮灭就达到了测试目的。
7. 附件:
修改过后的diff文件:
ubuntu@ubuntu20:~/harmony/sdk$ git diff> gpio_sample.diff
`