![](/media/cache/group/default_image.jpg.50x50_q85.jpg)
PWM test code
Dependencies: mbed TextLCD mRotaryEncoder
Diff: main.cpp
- Revision:
- 1:42a135eee439
- Parent:
- 0:376d7a150177
diff -r 376d7a150177 -r 42a135eee439 main.cpp --- a/main.cpp Wed Dec 03 03:48:48 2014 +0000 +++ b/main.cpp Wed Mar 02 21:58:48 2022 +0000 @@ -1,20 +1,124 @@ #include "mbed.h" #include "TextLCD.h" -//Incluye resistencias de 2.2K en los pines de i2c a 3.3 +#include "mRotaryEncoder.h" + +DigitalOut fan_enable(PA_8); // high to enable fan, low to turn off +PwmOut fan_pwm(PB_15); //D9 D13); +// I2C Communication +I2C i2c_lcd(PB_7,PB_6); // SDA, SCL + +TextLCD_I2C lcd(&i2c_lcd, 0x4E, TextLCD::LCD16x2, TextLCD::HD44780); // I2C bus, PCF8574 Slaveaddress, LCD Type, Device Type + +// Here's the encoder object +//mRotaryEncoder enc(D7,D8, D2,PullNone); +//RPG rpg1(PA_3,PA_4,PA_7); //Set up RPG +//mRotaryEncoder enc(PA_3,PA_4,PA_7,PullUp); +mRotaryEncoder enc(PB_12,PB_13,PB_14,PullUp); + +float fan_speed = 0.00; +float fan_speed_old = 0.00; +int fan_pwr=0; // +char buffer[20]; +// LCD print helper +void lcd_printS(int line, int col, char text[]) +{ + lcd.locate(col, line); //locate(int column, int row); + lcd.printf(text); + //for (i=0;i<strlen(text);i++) + // printC(text[i]); +} -// I2C Communication -I2C i2c_lcd(p28,p27); // SDA, SCL - -TextLCD_I2C lcd(&i2c_lcd, 0x4E, TextLCD::LCD16x2, TextLCD::HD44780); // I2C bus, PCF8574 Slaveaddress, LCD Type, Device Type +// Helper function to set the PWM values +void setfanspeed() +{ + //if (fan_pwr>0) fan_pwm.write(fan_speed); + fan_pwm.write(fan_speed); + //fan_pwm.write(1.00 - fan_speed); +} + +// Library calls here when you go clockwise +void cw() +{ +// modify the selected RGB component + if (fan_pwr>0) + { + fan_speed +=0.010; + if (fan_speed>0.95) fan_speed=0.950; + } + setfanspeed(); +} + +// Library calls here when you go anticlockwise +void ccw() +{ +// modify the selected RGB component + if (fan_pwr>0) + { + fan_speed -=0.010; + if (fan_speed<0.05) fan_speed=0.050; + } + setfanspeed(); +} + +// Library calls here when you push in on the encoder shaft +void btn() +{ + // change selected component (0, 1, 2) + if (++fan_pwr>1) + { + fan_enable = 0; // turn fan OFF + fan_pwr=0; + fan_speed_old = fan_speed; + fan_speed = 0.00; + } + else + { + fan_enable = 1; // turn fan ON + fan_speed = fan_speed_old; + } + setfanspeed(); +} + int main() { -lcd.setMode(TextLCD::DispOn); //DispOff, DispOn -lcd.setBacklight(TextLCD::LightOff);//LightOff, LightOn -lcd.setCursor(TextLCD::CurOff_BlkOff);//CurOff_BlkOff, CurOn_BlkOff, CurOff_BlkOn, CurOn_BlkOn -lcd.printf("Oscar de Jesus \n Vasquez"); + fan_enable = 0; // turn fan off + //fan_pwm.period(0.01); // setup PWM in seconds. 0.01 == 100hz + //fan_pwm.period_ms(100); // setup PWM in milli seconds. 1 == 1 khz + // Note: the PWM using the 555 supplied by RIXENS runs around 200khz + // - running the pwm at 100khz looses resolution at the top and bottom. + // - running the pwm at 10khz has much more accuracy and resolution. + // - running the pwm at 20khz has same accuracy and resolution as 10khz. + fan_pwm.period_us(100); // setup PWM in micro seconds. 100 == 10khz, 50 == 20khz,10 == 100khz, 5 == 200khz, + + setfanspeed(); + // Set up encoder callbacks + enc.attachROTCW(cw); + enc.attachROTCCW(ccw); + enc.attachSW(btn); + + lcd.setMode(TextLCD::DispOn); //DispOff, DispOn + lcd.setBacklight(TextLCD::LightOff);//LightOff, LightOn + lcd.setCursor(TextLCD::CurOff_BlkOff);//CurOff_BlkOff, CurOn_BlkOff, CurOff_BlkOn, CurOn_BlkOn + //lcd.printf("Testing I2C LCD"); + //lcd.locate(0, 1); //locate(int column, int row); + //lcd.printf("does it work"); + //lcd.setBacklight(TextLCD::LightOn);//LightOff, LightOn + + lcd.cls(); + lcd_printS(0,0,"Fan Setting:"); + lcd_printS(1,0,"Fan Speed: "); - } \ No newline at end of file + while (true) // nothing else to do but wait + { + wait(0.25); + if (fan_pwr>0) lcd_printS(0,12," ON "); + else lcd_printS(0,12," OFF"); + sprintf(buffer,"%3d", (int)(fan_speed * 100)); + lcd_printS(1,12,buffer); + //LCD.printS(1, 0, buffer); + } +} \ No newline at end of file