学习目标

  • 掌握GPIO的开发流程
  • 掌握PWM的开发流程
  • 掌握蜂鸣器播放音乐

    学习内容

    IO引脚说明

    | 引脚 | Uart | SPI | ADC | PWM | I2S | SDIO | I2C | | —- | —- | —- | —- | —- | —- | —- | —- | | GPIO_07 | CTS_1 | RXD_0 | ADC_3 | PWM_0 | CLK_0 | | | | GPIO_08 | RTS_1 | TXD_0 | | PWM_1 | WS_0 | | | | GPIO_10 | CTS_2 | CLK_0 | | PWM_1 | TX_0 | D3 | SDA_0 | | GPIO_09 | RTS_2 | TXD_0 | ADC_4 | PWM_0 | MCK_0 | D2 | SCL_0 | | GPIO_03 | LOG_TXD_0 | | | | | | | | GPIO_04 | LOG_RXD_0 | | ADC_1 | | | | | | GPIO_02 | | | | PWM_2 | MCK_0 | | | | GPIO_05 | RXD_1 | CSI_0 | ADC_2 | PWM_2 | TX_0 | | | | GPIO_06 | TXD_1 | CLK_0 | | PWM_3 | | | | | GPIO_14 | LOG_RXD_0/CTS_2 | | | PWM_5 | RX_0 | D1 | SCL_0 | | GPIO_11 | TXD_2 | RXD_0 | ADC_5 | PWM_2 | CLK_0 | CMD | | | GPIO_12 | RXD_2 | CSI_0 | ADC_0 | PWM_3 | WS_0 | CLK | | | GPIO_13 | LOG_TXD_0/RTS_2 | | ADC_6 | PWM_4 | | D0 | SDA_0 |

GPIO控制LED

通过GPIO来点亮一盏灯

原理图

110.png

GPIO配置

  1.  //初始化引脚
  2. IoTGpioInit(IOT_IO_NAME_2);
  3. //设置IO口功能为GPIO       
  4. IoTGpioSetFunc(IOT_IO_NAME_2, IOT_GPIO_FUNC_GPIO_2_GPIO);
  5. //设置IO口输出方向：输出
  6. IoTGpioSetDir(IOT_IO_NAME_2, IOT_GPIO_DIR_OUT);
  1. // 高电平输出
  2. IoTGpioSetOutputVal(IOT_IO_NAME_2,IOT_GPIO_VALUE1);
  3. // 低电平输出
  4. IoTGpioSetOutputVal(IOT_IO_NAME_2,IOT_GPIO_VALUE0);

开发流程

来到应用开发的根目录。
我们编写代码的根目录为device/board/itcast/genkipi/app。

  1. 根目录下新建gpio_led文件夹，此为项目目录。
  2. 此项目目录下新建main.c文件
  3. 此项目目录下新建BUILD.gn文件
  4. 修改根目录下的BUILD.gn文件
    代码部分
    ```c

    include

    include

    include

include “ohos_init.h”

include “cmsis_os2.h”

include “iot_gpio.h”

include “iot_gpio_ex.h”

static void start(void) { //初始化GPIO口 IoTGpioInit(IOT_IO_NAME_2); //设置IO口功能为GPIO IoTGpioSetFunc(IOT_IO_NAME_2, IOT_GPIO_FUNC_GPIO_2_GPIO); //设置IO口输出方向：输出 IoTGpioSetDir(IOT_IO_NAME_2,IOT_GPIO_DIR_OUT); //不断输出高低电压 while (1){ IoTGpioSetOutputVal(IOT_IO_NAME_2,IOT_GPIO_VALUE1); usleep(1000*1000);

  1.     IoTGpioSetOutputVal(IOT_IO_NAME_2,IOT_GPIO_VALUE0);
  2.     usleep(1000*1000);
  3. }

}

APP_FEATURE_INIT(start);

  1. ```c
  2. static_library("gpio_led") {
  3.     sources = [
  4.         "main.c"
  5.     ]
  7.     include_dirs = [
  8.         "//base/iothardware/peripheral/interfaces/inner_api",
  9.         "../../iot_hardware_hals/include"
  10.     ]
  11. }
  1. import("//build/lite/config/component/lite_component.gni")
  3. lite_component("app") {
  4.   features = [
  5.     "gpio_led"
  6.   ]
  7. }

PWM控制LED

PWM配置

  1. //初始化GPIO口
  2. IoTGpioInit(IOT_IO_NAME_2);
  3. //设置IO口功能为PWM
  4. IoTGpioSetFunc(IOT_IO_NAME_2, IOT_GPIO_FUNC_GPIO_2_PWM2_OUT);
  5. //设置IO口输出方向：输出
  6. IoTGpioSetDir(IOT_IO_NAME_2, IOT_GPIO_DIR_OUT);
  7. //不断输出高低电压
  8. IoTPwmInit(IOT_PWM_NAME_2);
  1. IoTPwmStart(IOT_PWM_NAME_2, i, 10000);

开发流程

来到应用开发的根目录。
我们编写代码的根目录为device/board/itcast/genkipi/app。

  1. 根目录下新建pwm_led文件夹，此为项目目录。
  2. 此项目目录下新建main.c文件
  3. 此项目目录下新建BUILD.gn文件
  4. 修改根目录下的BUILD.gn文件
    代码部分
    ```c

    include

    include

    include

include “ohos_init.h”

include “cmsis_os2.h”

include “iot_gpio.h”

include “iot_gpio_ex.h”

include “iot_pwm.h”

static void start(void) { //初始化GPIO口 IoTGpioInit(IOT_IO_NAME_2); //设置IO口功能为PWM IoTGpioSetFunc(IOT_IO_NAME_2, IOT_GPIO_FUNC_GPIO_2_PWM2_OUT); //设置IO口输出方向：输出 IoTGpioSetDir(IOT_IO_NAME_2, IOT_GPIO_DIR_OUT); //不断输出高低电压 IoTPwmInit(IOT_PWM_NAME_2); while (1){ for (int i = 0; i < 20; i++) { IoTPwmStart(IOT_PWM_NAME_2, i, 10000); usleep(0.05 1000 1000); }

  1.     for (int i = 20; i > 0; i--) {
  2.         IoTPwmStart(IOT_PWM_NAME_2, i, 10000);
  3.         usleep(0.05 * 1000 * 1000);
  4.     }
  5. }

}

APP_FEATURE_INIT(start);

  1. ```c
  2. static_library("pwm_led") {
  3.     sources = [
  4.         "main.c"
  5.     ]
  7.     include_dirs = [
  8.         "//base/iothardware/peripheral/interfaces/inner_api",
  9.         "../../iot_hardware_hals/include"
  10.     ]
  11. }
  1. import("//build/lite/config/component/lite_component.gni")
  3. lite_component("app") {
  4.   features = [
  5.     "pwm_led"
  6.   ]
  7. }

PWM蜂鸣器

113.png

开发流程

来到应用开发的根目录。
我们编写代码的根目录为device/board/itcast/genkipi/app。

  1. 根目录下新建pwm_buzzer文件夹，此为项目目录。
  2. 此项目目录下新建main.c文件
  3. 此项目目录下新建BUILD.gn文件
  4. 修改根目录下的BUILD.gn文件
    代码部分
    ```c

    include

    include

    include

include “ohos_init.h”

include “cmsis_os2.h”

include “iot_gpio.h”

include “iot_gpio_ex.h”

include “iot_pwm.h”

static void start(void) { //初始化GPIO口 IoTGpioInit(IOT_IO_NAME_14); //设置IO口功能为PWM IoTGpioSetFunc(IOT_IO_NAME_14, IOT_GPIO_FUNC_GPIO_14_PWM5_OUT); //设置IO口输出方向：输出 IoTGpioSetDir(IOT_IO_NAME_14, IOT_GPIO_DIR_OUT); //不断输出高低电压 IoTPwmInit(IOT_PWM_NAME_5); while (1) { IoTPwmStart(IOT_PWM_NAME_5, 50, 10000); usleep(2 1000 1000);

  1.     IoTPwmStop(IOT_PWM_NAME_5);
  2.     usleep(2 * 1000 * 1000);
  3. }

}

APP_FEATURE_INIT(start);

  1. ```c
  2. static_library("pwm_buzzer") {
  3.     sources = [
  4.         "main.c"
  5.     ]
  7.     include_dirs = [
  8.         "//base/iothardware/peripheral/interfaces/inner_api",
  9.         "../../iot_hardware_hals/include"
  10.     ]
  11. }
  1. import("//build/lite/config/component/lite_component.gni")
  3. lite_component("app") {
  4.   features = [
  5.     "pwm_buzzer"
  6.   ]
  7. }

音乐播放器

开发流程

来到应用开发的根目录。
我们编写代码的根目录为device/board/itcast/genkipi/app。

  1. 根目录下新建music文件夹，此为项目目录。
  2. 此项目目录下新建main.c文件
  3. 此项目目录下新建BUILD.gn文件
  4. 修改根目录下的BUILD.gn文件
    代码部分
    ```c

    include

    include

    include

include “ohos_init.h”

include “cmsis_os2.h”

include “iot_gpio.h”

include “iot_gpio_ex.h”

include “iot_pwm.h”

static uint8_t notes[] = { 1, 2, 3, 1, 1, 2, 3, 1, 3, 4, 5, 3, 4, 5, 5, 6, 5, 4, 3, 1, 5, 6, 5, 4, 3, 1, 1, 5, 1, 1, 5, 1};

static uint8_t durations[] = { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 4, 4, 8, 3, 1, 3, 1, 4, 4, 3, 1, 3, 1, 4, 4, 4, 4, 8, 4, 4, 8};

static uint16_t FREQS[] = {0, 523, 587, 659, 698, 784, 880, 988, 523 * 2};

static void start(void) { //初始化GPIO口 IoTGpioInit(IOT_IO_NAME_14); //设置IO口功能为PWM IoTGpioSetFunc(IOT_IO_NAME_14, IOT_GPIO_FUNC_GPIO_14_PWM5_OUT); //设置IO口输出方向：输出 IoTGpioSetDir(IOT_IO_NAME_14, IOT_GPIO_DIR_OUT); //不断输出高低电压 IoTPwmInit(IOT_PWM_NAME_5); while (1) {

  1.     for (size_t i = 0; i < sizeof(notes) / sizeof(notes[0]); i++)
  2.     {
  3.         uint8_t note = notes[i];          // 音符
  4.         uint16_t hz = FREQS[note] * 8;        // 频率
  5.         uint8_t duration = durations[i]; // 音符节拍
  7.         IoTPwmStart(IOT_PWM_NAME_5, 50, hz);
  8.         usleep(duration * 125 * 1000);
  9.         IoTPwmStop(IOT_PWM_NAME_5);
  10.     }
  12.     usleep(5 * 1000 * 1000);
  13. }

}

APP_FEATURE_INIT(start);

  1. ```c
  2. static_library("music") {
  3.     sources = [
  4.         "main.c"
  5.     ]
  7.     include_dirs = [
  8.         "//base/iothardware/peripheral/interfaces/inner_api",
  9.         "../../iot_hardware_hals/include"
  10.     ]
  11. }
  1. import("//build/lite/config/component/lite_component.gni")
  3. lite_component("app") {
  4.   features = [
  5.     "music"
  6.   ]
  7. }

蜂鸣器驱动封装

开发流程

来到应用开发的根目录。
我们编写代码的根目录为device/board/itcast/genkipi/app。

  1. 根目录下新建music_driver文件夹，此为项目目录。
  2. 此项目目录下新建main.c,buzzer.h``buzzer.c文件
  3. 此项目目录下新建BUILD.gn文件
  4. 修改根目录下的BUILD.gn文件 ```c

    include

    include

    include

include “ohos_init.h”

include “cmsis_os2.h”

include “buzzer.h”

static uint8_t notes[] = { 1, 2, 3, 1, 1, 2, 3, 1, 3, 4, 5, 3, 4, 5, 5, 6, 5, 4, 3, 1, 5, 6, 5, 4, 3, 1, 1, 5, 1, 1, 5, 1};

static uint8_t durations[] = { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 4, 4, 8, 3, 1, 3, 1, 4, 4, 3, 1, 3, 1, 4, 4, 4, 4, 8, 4, 4, 8};

static uint16_t FREQS[] = {0, 523, 587, 659, 698, 784, 880, 988, 523 * 2};

static void start(void) { Buzzer_init(); while (1) {

  1.     for (size_t i = 0; i < sizeof(notes) / sizeof(notes[0]); i++)
  2.     {
  3.         uint8_t note = notes[i];          // 音符
  4.         uint16_t hz = FREQS[note] * 8;        // 频率
  5.         uint8_t duration = durations[i]; // 音符节拍
  7.         Buzzer_beep(hz);
  8.         usleep(duration * 125 * 1000);
  9.         Buzzer_stop();
  10.     }
  12.     usleep(5 * 1000 * 1000);
  13. }

}

APP_FEATURE_INIT(start);

  1. ```c
  2. #ifndef __BUZZER_H__
  3. #define __BUZZER_H__
  5. #include <stdint.h>
  7. #include "iot_gpio.h"
  8. #include "iot_gpio_ex.h"
  9. #include "iot_pwm.h"
  11. #define BUZZER_PIN 14
  12. #define BUZZER_PWM_PORT 5
  13. #define BUZZER_PIN_FUNC IOT_GPIO_FUNC_GPIO_14_PWM5_OUT
  14. #define BUZZER_PIN_INIT()                            \
  15.     {                                                \
  16.         IoTGpioInit(BUZZER_PIN);                     \
  17.         IoTGpioSetFunc(BUZZER_PIN, BUZZER_PIN_FUNC); \
  18.         IoTGpioSetDir(BUZZER_PIN, IOT_GPIO_DIR_OUT); \
  19.         IoTPwmInit(BUZZER_PWM_PORT);                 \
  20.     }
  21. #define BUZZER_PWM_START(HZ)    {IoTPwmStart(BUZZER_PWM_PORT, 50, HZ);}
  22. #define BUZZER_PWM_STOP()       {IoTPwmStop(BUZZER_PWM_PORT);}
  24. void Buzzer_init(void);
  25. void Buzzer_beep(uint16_t hz);
  26. void Buzzer_stop(void);
  28. #endif
  1. #include "buzzer.h"
  4. void Buzzer_init(void) {
  5.     BUZZER_PIN_INIT();
  6. }
  8. void Buzzer_beep(uint16_t hz) {
  9.     BUZZER_PWM_START(hz);
  10. }
  12. void Buzzer_stop(void) {
  13.     BUZZER_PWM_STOP();
  14. }
  1. static_library("music_driver") {
  2.     sources = [
  3.         "main.c",
  4.         "buzzer.c"
  5.     ]
  7.     include_dirs = [
  8.         "//base/iothardware/peripheral/interfaces/inner_api",
  9.         "../../iot_hardware_hals/include"
  10.     ]
  11. }
  1. import("//build/lite/config/component/lite_component.gni")
  3. lite_component("app") {
  4.   features = [
  5.     "music_driver"
  6.   ]
  7. }

蜂鸣器驱动封装

练习题

  1. gpio控制灯
  2. pwm控制灯
  3. pwm播放音乐
  4. buzzer驱动封装