problem about config timer1 and timer3 on pwm mode(ATmega128

zebelxan · Joined: 19 Apr 2017 Posts: 2

hello dear friends;

i have a problem on bascom with making same pwm from timer1 and timer3 ( Both are 16Bit) But before asking i think its better i say that i am new to electronics and bascom.

i want to control speed of 4 DC Motor using " ATmega1284p + L298N "
however i have same config for both timers but the result pwm is different with each other.

i need all of that 4 produced signals be same.(duty cycle= 50%==> like timer3 signals)

this image is showing my question clearly:

http://uupload.ir/files/7lr3_capture1.png

and this is bascom code:

bzijlstra · Posted: Thu Apr 20, 2017 2:06 am Post subject: JTAG fusebits?

Have you checked the JTAG fusebit settings?

zebelxan · Joined: 19 Apr 2017 Posts: 2

dear friend thanks for reply. Wink

i am new to bascom and the code above is all my bascom project code.

bzijlstra · Posted: Thu Apr 20, 2017 10:39 am Post subject: Fuses

There are some 'fuses' inside the microcontroller. To handle internal or external crystal, bootloader, speed of booting etc. One of these fuses enable/disable JTAG. If the JTAG is enabled some of the Portc pins will work different. So you will have to disable JTAG.

Do a small search in this forum about JTAG and fuses. It is always nice to know how these fuses are set. For instance the atmega88 can be shipped from factory running on a 8 Mhz internal RC clock but divided by 8. So running on 1 Mhz.

Have fun
Ben Zijlstra

EDC · Joined: 26 Mar 2014 Posts: 673

If you have version 2078 it means you are registered because last demo is 2075.
If you are registered user why dont you upgrade your Bascom into 2080 where maybe your program issues are fixed Very Happy

I must point you one more thing. For Pwm this Interrupts are not needed and some of them disturb your program (not pwm).
In Bascom language, word "Enable" is used for giving permission for Interrupt. "Enabe" not "power on" device.
For "power on" such device like ADC or AC you can use "Start ADC", "Start AC". Similar "Stop AC", or "Stop ADC" for switch off.

With timer it also work but "Stop Timer" means "switch prescaler for no pulses"

After command "Config Timer = ..." you dont need to use "Start Timer" because it is done automatically.

To the point: