stm32使用arduino encoder库的改造草案
改装以前的简单项目，升级一下开发板，arduino nano 328p 换到STM32F103。

原项目用到中断监测编码器的库Encoder Library
https://www.pjrc.com/teensy/td_libs_Encoder.html

官方似乎没有说明如何移植到STM32的方法。
来做个实验。

示例代码

/* Encoder Library - Basic Example* http://www.pjrc.com/teensy/td_libs_Encoder.html** This example code is in the public domain.*/#include <Encoder.h>// Change these two numbers to the pins connected to your encoder.
//   Best Performance: both pins have interrupt capability
//   Good Performance: only the first pin has interrupt capability
//   Low Performance:  neither pin has interrupt capability
Encoder myEnc(2,3);
//   avoid using pins with LEDs attachedvoid setup() {Serial.begin(9600);Serial.println("Basic Encoder Test:");
}long oldPosition  = -999;void loop() {long newPosition = myEnc.read();if (newPosition != oldPosition) {oldPosition = newPosition;Serial.println(newPosition);}
}

nano板编译下载运行都很漂亮。

但是 选择 Generic STM32F103C series开发板时编译都不过。报错如下

D:\Program Files\arduino-1.8.9\arduino-builder -dump-prefs -logger=machine -hardware D:\Program Files\arduino-1.8.9\hardware -hardware C:\Users\Administrator\AppData\Local\Arduino15\packages -tools D:\Program Files\arduino-1.8.9\tools-builder -tools D:\Program Files\arduino-1.8.9\hardware\tools\avr -tools C:\Users\Administrator\AppData\Local\Arduino15\packages -built-in-libraries D:\Program Files\arduino-1.8.9\libraries -libraries C:\Users\Administrator\Documents\Arduino\libraries -fqbn=Arduino_STM32-master:STM32F1:genericSTM32F103C:device_variant=STM32F103C8,upload_method=serialMethod,cpu_speed=speed_72mhz,opt=osstd -vid-pid=10C4_EA60 -ide-version=10809 -build-path C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_683750 -warnings=none -build-cache C:\Users\ADMINI~1\AppData\Local\Temp\arduino_cache_499795 -prefs=build.warn_data_percentage=75 -verbose C:\Users\Administrator\Documents\Arduino\libraries\Encoder\examples\Basic\Basic.pde
D:\Program Files\arduino-1.8.9\arduino-builder -compile -logger=machine -hardware D:\Program Files\arduino-1.8.9\hardware -hardware C:\Users\Administrator\AppData\Local\Arduino15\packages -tools D:\Program Files\arduino-1.8.9\tools-builder -tools D:\Program Files\arduino-1.8.9\hardware\tools\avr -tools C:\Users\Administrator\AppData\Local\Arduino15\packages -built-in-libraries D:\Program Files\arduino-1.8.9\libraries -libraries C:\Users\Administrator\Documents\Arduino\libraries -fqbn=Arduino_STM32-master:STM32F1:genericSTM32F103C:device_variant=STM32F103C8,upload_method=serialMethod,cpu_speed=speed_72mhz,opt=osstd -vid-pid=10C4_EA60 -ide-version=10809 -build-path C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_683750 -warnings=none -build-cache C:\Users\ADMINI~1\AppData\Local\Temp\arduino_cache_499795 -prefs=build.warn_data_percentage=75 -verbose C:\Users\Administrator\Documents\Arduino\libraries\Encoder\examples\Basic\Basic.pde
Using board 'genericSTM32F103C' from platform in folder: D:\Program Files\arduino-1.8.9\hardware\Arduino_STM32-master\STM32F1
Using core 'maple' from platform in folder: D:\Program Files\arduino-1.8.9\hardware\Arduino_STM32-master\STM32F1
Detecting libraries used...
"C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\arm-none-eabi-gcc\\4.8.3-2014q1/bin/arm-none-eabi-g++" -c -g -Os -w -DDEBUG_LEVEL=DEBUG_NONE -std=gnu++11 -ffunction-sections -fdata-sections -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -DBOARD_generic_stm32f103c -DVECT_TAB_ADDR=0x8000000 -DERROR_LED_PORT=GPIOC -DERROR_LED_PIN=13 -w -x c++ -E -CC -mcpu=cortex-m3 -DF_CPU=72000000L -DARDUINO=10809 -DARDUINO_GENERIC_STM32F103C -DARDUINO_ARCH_STM32F1 -DCONFIG_MAPLE_MINI_NO_DISABLE_DEBUG -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/stm32f1/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/stm32f1" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/usb_lib" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\cores\\maple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\variants\\generic_stm32f103c" "C:\\Users\\ADMINI~1\\AppData\\Local\\Temp\\arduino_build_683750\\sketch\\Basic.pde.cpp" -o nul
"C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\arm-none-eabi-gcc\\4.8.3-2014q1/bin/arm-none-eabi-g++" -c -g -Os -w -DDEBUG_LEVEL=DEBUG_NONE -std=gnu++11 -ffunction-sections -fdata-sections -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -DBOARD_generic_stm32f103c -DVECT_TAB_ADDR=0x8000000 -DERROR_LED_PORT=GPIOC -DERROR_LED_PIN=13 -w -x c++ -E -CC -mcpu=cortex-m3 -DF_CPU=72000000L -DARDUINO=10809 -DARDUINO_GENERIC_STM32F103C -DARDUINO_ARCH_STM32F1 -DCONFIG_MAPLE_MINI_NO_DISABLE_DEBUG -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/stm32f1/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/stm32f1" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/usb_lib" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\cores\\maple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\variants\\generic_stm32f103c" "-IC:\\Users\\Administrator\\Documents\\Arduino\\libraries\\Encoder" "C:\\Users\\ADMINI~1\\AppData\\Local\\Temp\\arduino_build_683750\\sketch\\Basic.pde.cpp" -o nul
Error while detecting libraries included by C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_683750\sketch\Basic.pde.cpp
"C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\arm-none-eabi-gcc\\4.8.3-2014q1/bin/arm-none-eabi-g++" -c -g -Os -w -DDEBUG_LEVEL=DEBUG_NONE -std=gnu++11 -ffunction-sections -fdata-sections -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -DBOARD_generic_stm32f103c -DVECT_TAB_ADDR=0x8000000 -DERROR_LED_PORT=GPIOC -DERROR_LED_PIN=13 -w -x c++ -E -CC -mcpu=cortex-m3 -DF_CPU=72000000L -DARDUINO=10809 -DARDUINO_GENERIC_STM32F103C -DARDUINO_ARCH_STM32F1 -DCONFIG_MAPLE_MINI_NO_DISABLE_DEBUG -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/stm32f1/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/stm32f1" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/usb_lib" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\cores\\maple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\variants\\generic_stm32f103c" "-IC:\\Users\\Administrator\\Documents\\Arduino\\libraries\\Encoder" "-IC:\\Users\\Administrator\\Documents\\Arduino\\libraries\\Encoder\\utility" "C:\\Users\\Administrator\\Documents\\Arduino\\libraries\\Encoder\\Encoder.cpp" -o nul
Error while detecting libraries included by C:\Users\Administrator\Documents\Arduino\libraries\Encoder\Encoder.cpp
Generating function prototypes...
"C:\\Users\\Administrator\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\arm-none-eabi-gcc\\4.8.3-2014q1/bin/arm-none-eabi-g++" -c -g -Os -w -DDEBUG_LEVEL=DEBUG_NONE -std=gnu++11 -ffunction-sections -fdata-sections -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -DBOARD_generic_stm32f103c -DVECT_TAB_ADDR=0x8000000 -DERROR_LED_PORT=GPIOC -DERROR_LED_PIN=13 -w -x c++ -E -CC -mcpu=cortex-m3 -DF_CPU=72000000L -DARDUINO=10809 -DARDUINO_GENERIC_STM32F103C -DARDUINO_ARCH_STM32F1 -DCONFIG_MAPLE_MINI_NO_DISABLE_DEBUG -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 -DMCU_STM32F103C8 -mthumb -march=armv7-m -D__STM32F1__ -DARDUINO_ARCH_STM32 "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/stm32f1/include" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/stm32f1" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\system/libmaple/usb/usb_lib" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\cores\\maple" "-ID:\\Program Files\\arduino-1.8.9\\hardware\\Arduino_STM32-master\\STM32F1\\variants\\generic_stm32f103c" "-IC:\\Users\\Administrator\\Documents\\Arduino\\libraries\\Encoder" "C:\\Users\\ADMINI~1\\AppData\\Local\\Temp\\arduino_build_683750\\sketch\\Basic.pde.cpp" -o "C:\\Users\\ADMINI~1\\AppData\\Local\\Temp\\arduino_build_683750\\preproc\\ctags_target_for_gcc_minus_e.cpp"
In file included from C:\Users\Administrator\Documents\Arduino\libraries\Encoder/Encoder.h:46:0,from C:\Users\Administrator\Documents\Arduino\libraries\Encoder\examples\Basic\Basic.pde:7:C:\Users\Administrator\Documents\Arduino\libraries\Encoder/utility/interrupt_pins.h:150:2: error: #error "Interrupts are unknown for this board, please add to this code"#error "Interrupts are unknown for this board, please add to this code"^C:\Users\Administrator\Documents\Arduino\libraries\Encoder/utility/interrupt_pins.h:153:2: error: #error "Encoder requires interrupt pins, but this board does not have any :("#error "Encoder requires interrupt pins, but this board does not have any :("^C:\Users\Administrator\Documents\Arduino\libraries\Encoder/utility/interrupt_pins.h:154:2: error: #error "You could try defining ENCODER_DO_NOT_USE_INTERRUPTS as a kludge."#error "You could try defining ENCODER_DO_NOT_USE_INTERRUPTS as a kludge."^使用库 Encoder 在文件夹： C:\Users\Administrator\Documents\Arduino\libraries\Encoder (legacy)
exit status 1
为开发板 Generic STM32F103C series 编译时出错。

Error while detecting libraries included by C:\Users\Administrator\Documents\Arduino\libraries\Encoder\Encoder.cpp，
没有细究，可能编译时与头文件引用顺序有关？？，发现Encoder.cpp内部只有两行代码，直接拿到主文件就好了。

再经过穿针引线读了一番库的源码，示例文件做了相关改进

/* Encoder Library - Basic Example* http://www.pjrc.com/teensy/td_libs_Encoder.html** This example code is in the public domain.*/
//STM32F103C8 使用 Encoder Library 
//设置使用外部中断
#define ENCODER_USE_INTERRUPTS//设置核心中断数，这个数并不是个数，实际上是设置interruptArgs数组的长度
#define CORE_NUM_INTERRUPT 50//
//外部中断引脚号，interruptArgs数组索引相关，CORE_NUM_INTERRUPT要大于等于使用最大的引脚号
#define CORE_INT28_PIN PB12 //28
#define CORE_INT29_PIN PB13 //29
//stm32 set   direct_pin_read_h_
#define IO_REG_TYPE      uint32_t
#define PIN_TO_BASEREG(pin)             (portInputRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define DIRECT_PIN_READ(base, mask)     (((*(base)) & (mask)) ? 1 : 0)
//*/
#include <Encoder.h>
//lib file Encoder.cpp 编译err，注释cpp的代码，write them here。
Encoder_internal_state_t * Encoder::interruptArgs[];
//interruptArgs的长度就是CORE_NUM_INTERRUPT，中断与引脚号相关联。
//假设CORE_INT100_PIN=100，interruptArgs会有100个指针，不管是否使用100个中断，所以有点浪费。// Change these two numbers to the pins connected to your encoder.
//   Best Performance: both pins have interrupt capability
//   Good Performance: only the first pin has interrupt capability
//   Low Performance:  neither pin has interrupt capability
Encoder myEnc(PB12, PB13);
//   avoid using pins with LEDs attachedvoid setup() {Serial.begin(9600);Serial.println("Basic Encoder Test:");
}long oldPosition  = -999;void loop() {long newPosition = myEnc.read();if (newPosition != oldPosition) {oldPosition = newPosition;Serial.println(newPosition);}
}

这样虽然能用，但想想CORE_NUM_INTERRUPT、 Encoder::interruptArgs[];总有些纠结。
当然这是库的优势能适应各种不同的开发板。浪费几个字节也是值得的。

下面开刀改库，为了找回这几个字节，并稍微改动了原来的架构，并没有多考虑可移植的问题。
ZEncoder.h

//                           _______         _______
//               Pin1 ______|       |_______|       |______ Pin1
// negative <---         _______         _______         __      --> positive
//               Pin2 __|       |_______|       |_______|   Pin2//	new	new	old	old
//	pin2	pin1	pin2	pin1	Result
//	----	----	----	----	------
//	0	0	0	0	no movement
//	0	0	0	1	+1
//	0	0	1	0	-1
//	0	0	1	1	+2  (assume pin1 edges only)
//	0	1	0	0	-1
//	0	1	0	1	no movement
//	0	1	1	0	-2  (assume pin1 edges only)
//	0	1	1	1	+1
//	1	0	0	0	+1
//	1	0	0	1	-2  (assume pin1 edges only)
//	1	0	1	0	no movement
//	1	0	1	1	-1
//	1	1	0	0	+2  (assume pin1 edges only)
//	1	1	0	1	-1
//	1	1	1	0	+1
//	1	1	1	1	no movement
/*// Simple, easy-to-read "documentation" version :-)//void update(void) {uint8_t s = state & 3;if (digitalRead(pin1)) s |= 4;if (digitalRead(pin2)) s |= 8;switch (s) {case 0: case 5: case 10: case 15:break;case 1: case 7: case 8: case 14:position++; break;case 2: case 4: case 11: case 13:position--; break;case 3: case 12:position += 2; break;default:position -= 2; break;}state = (s >> 2);}
*/
#ifndef ZEncoder_h_
#define ZEncoder_h_#define IO_REG_TYPE      uint32_t
#define PIN_TO_BASEREG(pin)             (portInputRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define DIRECT_PIN_READ(base, mask)     (((*(base)) & (mask)) ? 1 : 0)// All the data needed by interrupts is consolidated into this ugly struct
// to facilitate assembly language optimizing of the speed critical update.
// The assembly code uses auto-incrementing addressing modes, so the struct
// must remain in exactly this order.
typedef struct {uint8_t pin1;uint8_t pin2;volatile IO_REG_TYPE * pin1_register;volatile IO_REG_TYPE * pin2_register;IO_REG_TYPE            pin1_bitmask;IO_REG_TYPE            pin2_bitmask;uint8_t                state;int32_t                position;
} Encoder_internal_state_t;
typedef void (*funcptr)(void);
class ZEncoder
{public:Encoder_internal_state_t encoder;uint8_t encoder_id;ZEncoder(uint8_t pin1, uint8_t pin2) {
#ifdef INPUT_PULLUPpinMode(pin1, INPUT_PULLUP);pinMode(pin2, INPUT_PULLUP);
#elsepinMode(pin1, INPUT);digitalWrite(pin1, HIGH);pinMode(pin2, INPUT);digitalWrite(pin2, HIGH);
#endifencoder.pin1 = pin1;encoder.pin2 = pin2;encoder.pin1_register = PIN_TO_BASEREG(pin1);encoder.pin1_bitmask = PIN_TO_BITMASK(pin1);encoder.pin2_register = PIN_TO_BASEREG(pin2);encoder.pin2_bitmask = PIN_TO_BITMASK(pin2);encoder.position = 0;// allow time for a passive R-C filter to charge// through the pullup resistors, before reading// the initial statedelayMicroseconds(2000);uint8_t s = 0;if (DIRECT_PIN_READ(encoder.pin1_register, encoder.pin1_bitmask)) s |= 1;if (DIRECT_PIN_READ(encoder.pin2_register, encoder.pin2_bitmask)) s |= 2;encoder.state = s;interrupts_in_use = 0;//interrupts_in_use = attach_interrupt(pin1, &encoder);//interrupts_in_use += attach_interrupt2(pin2, &encoder);//update_finishup();  // to force linker to include the code (does not work)//interruptArgs[0]=&encoder;//interruptArgs[1]=&encoder;encoder_id = ZEncoder_id;interruptArgs[encoder_id] = &encoder;ZEncoder_id++;}inline int32_t read() {noInterrupts();if (interrupts_in_use < 2) {update(&encoder);}int32_t ret = encoder.position;interrupts();return ret;}inline void write(int32_t p) {noInterrupts();encoder.position = p;interrupts();}uint8_t interrupts_in_use;private:public:uint8_t ZEncoder_id = 0;static  Encoder_internal_state_t * interruptArgs[2];static void update1(Encoder_internal_state_t *arg) {uint8_t state = arg->state & 3;if (digitalRead(arg->pin1)) state |= 4;if (digitalRead(arg->pin2)) state |= 8;arg->state = (state >> 2);switch (state) {case 1: case 7: case 8: case 14:arg->position++;return;case 2: case 4: case 11: case 13:arg->position--;return;case 3: case 12:arg->position += 2;return;case 6: case 9:arg->position -= 2;return;}}static void update(Encoder_internal_state_t *arg) {uint8_t p1val = DIRECT_PIN_READ(arg->pin1_register, arg->pin1_bitmask);uint8_t p2val = DIRECT_PIN_READ(arg->pin2_register, arg->pin2_bitmask);uint8_t state = arg->state & 3;if (p1val) state |= 4;if (p2val) state |= 8;arg->state = (state >> 2);switch (state) {case 1: case 7: case 8: case 14:arg->position++;return;case 2: case 4: case 11: case 13:arg->position--;return;case 3: case 12:arg->position += 2;return;case 6: case 9:arg->position -= 2;return;}}//static void myEnc0_isr_pin1(void) { update(interruptArgs[0]);    }//static void myEnc0_isr_pin2(void) { update(interruptArgs[0]);    }uint8_t attach_interrupt_pin1(uint8_t interruptArgs_id, void (*FuncPtr)(void)) {Encoder_internal_state_t * e = interruptArgs[interruptArgs_id] ;attachInterrupt(e->pin1,   FuncPtr, CHANGE);interrupts_in_use++;return 1;}uint8_t attach_interrupt_pin2(uint8_t interruptArgs_id, void (*FuncPtr)(void)) {Encoder_internal_state_t * e = interruptArgs[interruptArgs_id] ;attachInterrupt(e->pin2,   FuncPtr, CHANGE);interrupts_in_use++;return 1;}/*static  void isr0(void) { update(interruptArgs[0]);}static void isr1(void) { update(interruptArgs[1]);}uint8_t attach_interrupt(uint8_t pin, Encoder_internal_state_t *state) {interruptArgs[0] = state;attachInterrupt(pin,   isr0,CHANGE);return 1;}uint8_t attach_interrupt2(uint8_t pin, Encoder_internal_state_t *state) {interruptArgs[1] = state;attachInterrupt(pin,   isr1,CHANGE);return 1;}//*/};
#endif

不考虑兼容性代码简洁了很多。

使用方法：

#define ENCODER_USE_INTERRUPTS
#define ENCODER_ARGLIST_SIZE 2
#include "ZEncoder.h"
Encoder_internal_state_t * ZEncoder::interruptArgs[];
ZEncoder myEnc0(PB12, PB13);
void myEnc0_isr_pin1(void) {  ZEncoder::update(ZEncoder::interruptArgs[0]);}
void myEnc0_isr_pin2(void) {  ZEncoder::update(ZEncoder::interruptArgs[0]);}void setup() {myEnc0.attach_interrupt_pin1(0, myEnc0_isr_pin1);myEnc0.attach_interrupt_pin2(0, myEnc0_isr_pin2);Serial.begin(9600);Serial.println("Basic Encoder Test:");Serial.println(ZEncoder::interruptArgs[0]->pin1);Serial.println(ZEncoder::interruptArgs[0]->pin2);Serial.println(myEnc0.interrupts_in_use);
}long oldPosition  = -999;
void loop() {long newPosition = myEnc0.read();if (newPosition != oldPosition) {oldPosition = newPosition;Serial.println(newPosition);}
}

虽然不优雅，但心里舒坦了。