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 // errno 20 #define PWM_ERR (-1) 21 #define PWM_WRONOG_CHANNEL (-2) 22 #define PWM_FILE_NOT_EXIST (-3) 23 24 // pwm enable 25 #define PWM_NOT_ENABLED 0 26 #define PWM_IS_ENABLED 1 27 28 // pwm polarity 29 #define PWM_POLARITY_NORMAL 0 30 #define PWM_POLARITY_INVERSED 1 31 32 #define PWM1 1 33 #define PWM2 2 34 35 // pwm的引脚目录 36 #define PWM1_PEX "/sys/class/pwm/pwmchip0" 37 #define PWM2_PEX "/sys/class/pwm/pwmchip2" 38 39 // Hilog 40 #undef LOG_DOMAIN 41 #undef LOG_TAG 42 #define LOG_DOMAIN 0 // 标识业务领域，范围0x0~0xFFFFF 43 #define LOG_TAG "Pwm_Test" 44 45 /* 46 * 作用：初始化引脚，生成对应的引脚目录 47 * 参数：pwmChannel 为选择的引脚 48 */ 49 int init_pmw(int pwmChannel); 50 51 /* 52 * 设置pwm的溢出值 53 * 参数：pwmChannel 为选择的引脚，period 为溢出值 54 */ 55 int set_pwm_period(int pwmChannel, int period); 56 57 /* 58 * 设置pwm一个周期高电平时间 59 * 参数：pwmChannel 为选择的引脚，dutyCycle 为一个周期高电平的值 60 */ 61 int set_pwm_dutyCycle(int pwmChannel, int dutyCycle); 62 63 /* 64 * 设置pwm的极性 65 * 参数：pwmChannel 为选择的引脚，polarity 为极性 66 */ 67 int set_pwm_polarity(int pwmChannel, int polarity); 68 69 /* 70 * 打开pwm引脚，使其使能 71 * 参数：pwmChannel 为选择的引脚，isEnable 为开关值 72 */ 73 int set_pwm_enable(int pwmChannel, int isEnable); 74 75 /* 76 * 得到pwm的溢出值 77 * 参数：pwmChannel 为选择的引脚 78 */ 79 int get_pwm_period(int pwmChannel); 80 81 /* 82 * 得到pwm的一个周期高电平的值 83 * 参数：pwmChannel 为选择的引脚 84 */ 85 int get_pwm_dutyCycle(int pwmChannel); 86 87 /* 88 * 得到pwm的极性 89 * 参数：pwmChannel 为选择的引脚 90 */ 91 int get_pwm_polarity(int pwmChannel); 92 93 /* 94 * 查看pwm的引脚使能值 95 * 参数：pwmChannel 为选择的引脚 96 */ 97 int is_pwm_enabled(int pwmChannel); 98 99 #endif // endif __UM_PWM_H__ 100