#include <jni.h>
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#include <string>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <android/log.h>
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#define TAG "BuzzerApp"
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#define LOGI(fmt, args...) __android_log_print(ANDROID_LOG_INFO, TAG, fmt, ##args)
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#define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, TAG, fmt, ##args)
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#define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args)
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static char pwm_path[100];
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extern "C"
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JNIEXPORT jint JNICALL
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Java_com_example_serial_BuzzerControl_pwmOpen(JNIEnv *env, jclass clazz, jstring id) {
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// TODO: implement pwmOpen()
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char *id_native;
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char temp[100];
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int fd;
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id_native = (char *)env->GetStringUTFChars(id, 0);
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memset(pwm_path, 0, sizeof (pwm_path));
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snprintf(pwm_path, sizeof (pwm_path), "/sys/class/pwm/pwmchip%s/pwm0", id_native);
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memset(temp, 0, sizeof (temp));
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if(access(pwm_path, F_OK))
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{
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LOGE("pwm_path:%s, access=%d", pwm_path, access(pwm_path, F_OK));
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snprintf(temp, sizeof (temp), "/sys/class/pwm/pwmchip%s/export", id_native);
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fd = open(temp, O_WRONLY);
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if(fd < 0)
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{
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if( strstr(strerror(errno), "Permission denied") != nullptr )
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{
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LOGE("open %s error:%s\n", temp, strerror(errno));
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return 1;
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}
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LOGE("open %s error:%s\n", temp, strerror(errno));
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return -1;
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}
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if(1 != write(fd, "0", 1))
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{
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LOGE("Write '0' to pwmchip%s/export error\n", id_native);
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close(fd);
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return -2;
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}
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close(fd);
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}
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env->ReleaseStringUTFChars(id, id_native);
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return 0;
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}
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extern "C"
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JNIEXPORT jint JNICALL
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Java_com_example_serial_BuzzerControl_pwmConfig(JNIEnv *env, jclass clazz, jstring attr,
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jstring val) {
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// TODO: implement pwmConfig()
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char file_path[100];
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char *attr_native;
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char *val_native;
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int len;
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int fd = -1;
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int ret;
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if(attr == NULL || val == NULL)
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{
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LOGE("argument invalid\n");
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return -1;
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}
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attr_native = (char *)env->GetStringUTFChars(attr, 0);
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val_native = (char *)env->GetStringUTFChars(val, 0);
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memset(file_path, 0, sizeof(file_path));
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snprintf(file_path, sizeof (file_path), "%s/%s", pwm_path, attr_native);
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fd = open(file_path, O_WRONLY);
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if (fd < 0)
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{
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if( strstr(strerror(errno), "Permission denied") != nullptr )
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{
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LOGE("open %s error:%s\n", file_path, strerror(errno));
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fd=1;
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} // 表示缺少权限
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LOGE("[%s] open %s error:%s\n", __FUNCTION__ , file_path, strerror(errno));
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return fd;
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}
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len = strlen(val_native);
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if(len != write(fd, val_native, len))
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{
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if ( strstr(strerror(errno), "Invalid") != nullptr)
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{
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close(fd);
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return 2; //表示输入的参数无效
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}
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LOGE("[%s] write %s to %s error: %s\n", __FUNCTION__ , val_native, file_path, strerror(errno));
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close(fd);
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return -2;
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}
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close(fd);
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env->ReleaseStringUTFChars(attr,attr_native);
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env->ReleaseStringUTFChars(val, val_native);
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return 0;
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}
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