#include <jni.h>
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#include <string>
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#include <android/log.h>
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#include "include/gpiod.h"
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enum
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{
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LED_R=0,
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LED_Y,
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LED_G,
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LED_MAX,
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};
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enum
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{
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ON=0,
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OFF,
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};
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typedef struct led_gpio_s
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{
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int idx;
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int gpio;
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const char *desc;
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struct gpiod_line *line;
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}led_gpio_t;
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led_gpio_t leds[LED_MAX] =
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{
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{LED_R, 18, "red", NULL},
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{LED_Y, 22, "yellow", NULL},
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{LED_G, 20, "green", NULL},
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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_LedControl_ledOpen(JNIEnv *env, jclass clazz) {
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// TODO: implement ledOpen()
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struct gpiod_line *line;
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struct gpiod_chip *chip;
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const char *chipname = "gpiochip0";
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int ret;
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int i, j;
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int rv = 0;
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chip = gpiod_chip_open_by_name(chipname);
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if( !chip )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "gpiod open '%s' failed:%s\n", chipname, strerror(errno));
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return -1;
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}
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for( i=0; i<LED_MAX; i++ )
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{
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// 获取句柄
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leds[i].line = gpiod_chip_get_line(chip, leds[i].gpio);
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if( !leds[i].line )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "Get line[%d] failed:%s\n", leds[i].gpio, strerror(errno));
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gpiod_line_release(leds[i].line);
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gpiod_chip_close(chip);
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return -2;
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}
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// 判断该GPIO接口是否被占用
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ret = gpiod_line_is_used(leds[i].line);
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if( ret )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "line[%d] is used!\n", leds[i].gpio);
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gpiod_chip_close(chip);
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return -3;
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}
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// 设置该接口为输出模式
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ret = gpiod_line_request_output(leds[i].line, leds[i].desc, 0);
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if( ret < 0 )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "set line[%d] output failed:%s\n", leds[i].gpio, strerror(errno));
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gpiod_line_release(leds[i].line);
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gpiod_chip_close(chip);
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return -4;
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}
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}
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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_LedControl_ledCtrl(JNIEnv *env, jclass clazz, jint which, jint status) {
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// TODO: implement ledCtrl()
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if( which<0 || which>=LED_MAX )
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{
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return -1;
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}
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struct gpiod_chip *chip;
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const char *chipname = "gpiochip0";
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int ret;
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int rv = 0;
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chip = gpiod_chip_open_by_name(chipname);
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if( !chip )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "gpiod open '%s' failed:%s\n", chipname, strerror(errno));
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return -1;
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}
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// 获取句柄
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leds[which].line = gpiod_chip_get_line(chip, leds[which].gpio);
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if( !leds[which].line )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "Get line[%d] failed:%s\n", leds[which].gpio, strerror(errno));
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gpiod_line_release(leds[which].line);
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gpiod_chip_close(chip);
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return -2;
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}
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// 判断该GPIO接口是否被占用
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ret = gpiod_line_is_used(leds[which].line);
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if( ret )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "line[%d] is used!\n", leds[which].gpio);
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gpiod_chip_close(chip);
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return -3;
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}
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// 设置该接口为输出模式
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ret = gpiod_line_request_output(leds[which].line, leds[which].desc, 0);
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if( ret < 0 )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "set line[%d] output failed:%s\n", leds[which].gpio, strerror(errno));
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gpiod_line_release(leds[which].line);
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gpiod_chip_close(chip);
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return -4;
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}
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__android_log_print(ANDROID_LOG_DEBUG, "LEDDemo", "turn %s led GPIO#%d %s\n", leds[which].desc, leds[which].gpio, status?"off":"on");
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if( ON == status )
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{
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rv = gpiod_line_set_value(leds[which].line, 0);
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if( rv < 0 )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "turn %s ON failed:%s\n", leds[which].desc, strerror(errno));
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return -5;
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}
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}
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else
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{
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rv = gpiod_line_set_value(leds[which].line, 1);
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if( rv < 0 )
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{
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__android_log_print(ANDROID_LOG_INFO, "LEDDemo", "turn %s OFF failed:%s\n", leds[which].desc, strerror(errno));
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return -5;
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}
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}
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gpiod_line_release(leds[which].line);
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gpiod_chip_close(chip);
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return 0;
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}
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