1 /* 2 * Copyright (c) 2022 Unionman Technology Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef __UM_PWM_H__ 17 #define __UM_PWM_H__ 18 19 #ifdef __cplusplus 20 extern "C" { 21 #endif 22 23 // errno 24 #define PWM_ERR (-1) 25 #define PWM_WRONOG_CHANNEL (-2) 26 #define PWM_FILE_NOT_EXIST (-3) 27 28 // pwm enable 29 #define PWM_NOT_ENABLED 0 30 #define PWM_IS_ENABLED 1 31 32 // pwm polarity 33 #define PWM_POLARITY_NORMAL 0 34 #define PWM_POLARITY_INVERSED 1 35 36 #define PWM1 1 37 #define PWM2 2 38 39 // pwm的引脚目录 40 #define PWM1_PEX "/sys/class/pwm/pwmchip0" 41 #define PWM2_PEX "/sys/class/pwm/pwmchip2" 42 43 // Hilog 44 #undef LOG_DOMAIN 45 #undef LOG_TAG 46 #define LOG_DOMAIN 0 // 标识业务领域，范围0x0~0xFFFFF 47 #define LOG_TAG "Pwm_Test" 48 49 /* 50 * 作用：初始化引脚，生成对应的引脚目录 51 * 参数：pwmChannel 为选择的引脚 52 */ 53 int init_pmw(int pwmChannel); 54 55 /* 56 * 设置pwm的溢出值 57 * 参数：pwmChannel 为选择的引脚，period 为溢出值 58 */ 59 int set_pwm_period(int pwmChannel, int period); 60 61 /* 62 * 设置pwm一个周期高电平时间 63 * 参数：pwmChannel 为选择的引脚，dutyCycle 为一个周期高电平的值 64 */ 65 int set_pwm_dutyCycle(int pwmChannel, int dutyCycle); 66 67 /* 68 * 设置pwm的极性 69 * 参数：pwmChannel 为选择的引脚，polarity 为极性 70 */ 71 int set_pwm_polarity(int pwmChannel, int polarity); 72 73 /* 74 * 打开pwm引脚，使其使能 75 * 参数：pwmChannel 为选择的引脚，isEnable 为开关值 76 */ 77 int set_pwm_enable(int pwmChannel, int isEnable); 78 79 /* 80 * 得到pwm的溢出值 81 * 参数：pwmChannel 为选择的引脚 82 */ 83 int get_pwm_period(int pwmChannel); 84 85 /* 86 * 得到pwm的一个周期高电平的值 87 * 参数：pwmChannel 为选择的引脚 88 */ 89 int get_pwm_dutyCycle(int pwmChannel); 90 91 /* 92 * 得到pwm的极性 93 * 参数：pwmChannel 为选择的引脚 94 */ 95 int get_pwm_polarity(int pwmChannel); 96 97 /* 98 * 查看pwm的引脚使能值 99 * 参数：pwmChannel 为选择的引脚 100 */ 101 int is_pwm_enabled(int pwmChannel); 102 103 #ifdef __cplusplus 104 } 105 #endif 106 107 #endif // endif __UM_PWM_H__ 108