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/*
* Basic Servo library test program.
*
* Setup:
*
* - Connect a potentiometer to POT_PIN (default pin 15)
* - Connect an oscilloscope to SERVO_PIN1 (default pin 5) and
* SERVO_PIN2 (default pin 6).
* - Connect a serial monitor to SerialUSB
*
* The potentiometer controls the target angle for each of two Servo
* objects, one with angles in [-90, 90], and another in [0, 180].
* Servo pulse width range is [1000, 2000].
*
* Serial2 will tell you what inputs it's giving to each servo object,
* and some information it gets back. Pressing the button
* detaches/reattaches the Servo objects.
*
* Tests you should perform:
*
* - Check calculated pulse widths for each servo's target angle
* - Check that calculated pulse widths match actual pulse widths
* - Check that the period of the pulse train is roughly 20 ms
* - Check that the pulses stop when detached, and resume when reattached
* - Check that Servo::write() and Servo::read() round-trip properly
*
* This file is released into the public domain.
*/
#include <stdio.h>
#include "wirish.h"
#include "libraries/Servo/Servo.h"
#define POT_PIN 15
#define MIN_PW 1000
#define MAX_PW 2000
#define SERVO_PIN1 5
#define MIN_ANGLE1 0
#define MAX_ANGLE1 180
#define SERVO_PIN2 6
#define MIN_ANGLE2 (-90)
#define MAX_ANGLE2 90
Servo servo1;
Servo servo2;
#define BUF_SIZE 100
char buf[BUF_SIZE];
#define print_buf(fmt, ...) do { \
snprintf(buf, BUF_SIZE, fmt, __VA_ARGS__); \
Serial2.println(buf); } while (0)
int averageAnalogReads(int);
void attach();
void detach();
void setup() {
pinMode(POT_PIN, INPUT_ANALOG);
pinMode(BOARD_BUTTON_PIN, INPUT);
pinMode(BOARD_LED_PIN, OUTPUT);
Serial2.begin(9600);
servo1.attach(SERVO_PIN1, MIN_PW, MAX_PW, MIN_ANGLE1, MAX_ANGLE1);
servo2.attach(SERVO_PIN2, MIN_PW, MAX_PW, MIN_ANGLE2, MAX_ANGLE2);
ASSERT(servo1.attachedPin() == SERVO_PIN1);
ASSERT(servo2.attachedPin() == SERVO_PIN2);
}
void loop() {
delay(250);
toggleLED();
if (isButtonPressed()) {
if (servo1.attached()) detach();
else attach();
}
if (!servo1.attached()) return;
int32 average = averageAnalogReads(250);
int16 angle1 = (int16)map(average, 0, 4095, MIN_ANGLE1, MAX_ANGLE1);
int16 angle2 = (int16)map(average, 0, 4095, MIN_ANGLE2, MAX_ANGLE2);
print_buf("pot reading = %d, angle 1 = %d, angle 2 = %d.",
average, angle1, angle2);
servo1.write(angle1);
servo2.write(angle2);
int16 read1 = servo1.read();
int16 read2 = servo2.read();
print_buf("write/read angle 1: %d/%d, angle 2: %d/%d",
angle1, read1, angle2, read2);
ASSERT(abs(angle1 - read1) <= 1);
ASSERT(abs(angle2 - read2) <= 1);
print_buf("pulse width 1: %d, pulse width 2: %d",
servo1.readMicroseconds(), servo2.readMicroseconds());
Serial2.println("\n--------------------------\n");
}
int32 averageAnalogReads(int n) {
uint64 total = 0;
for (int i = 0; i < n; i++) {
total += analogRead(POT_PIN);
}
return (int32)(total / n);
}
void attach() {
Serial2.println("attaching");
servo1.attach(SERVO_PIN1);
servo2.attach(SERVO_PIN2);
ASSERT(servo1.attachedPin() == SERVO_PIN1);
ASSERT(servo2.attachedPin() == SERVO_PIN2);
}
void detach() {
Serial2.println("detaching");
servo1.detach();
servo2.detach();
ASSERT(!servo1.attached());
ASSERT(!servo2.attached());
}
// Force init to be called *first*, i.e. before static object allocation.
// Otherwise, statically allocated objects that need libmaple may fail.
__attribute__((constructor)) void premain() {
init();
}
int main(void) {
setup();
while (true) {
loop();
}
return 0;
}
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