www.elektronik.si

[tiger]

Na izhodu atmega324A OC1b (D.4)imam signal PWM za servo motor. Uporabljam tudi UART1. Signali so nivojsko OK, dokler ne konfiguriram UART2(D.3 in D.2). Po uporabi UART2 pa signal OC1B (D.4) ni več 0=V ali 5V, ampak 2.5V in 5V. Posledično servo nima definiranega nivoja 0V. Ne vem zakaj? Programiram z Bascom.
Kakšen namig? Hvala za odgovor.

[rplink3r]

Malo googlanja:

https://forum.arduino.cc/t/atmega324pb-pwm-hate-serial-oc1b-vs-xck1-oc2a-vs-xck2/1128894

[rplink3r]

• OC1B/XCK1/PCINT28 – Port D, Bit 4
OC1B, Output Compare Match B output: The PB4 pin can serve as an external output for the Timer/Counter1


Output Compare B. The pin has to be configured as an output (DDD4 set (one)) to serve this function. The
OC1B pin is also the output pin for the PWM mode timer function.
XCK1, USART1 External clock. The Data Direction Register (DDB4) controls whether the clock is output (DDD4set “one”)

or input (DDD4 cleared). The XCK4 pin is active only when the USART1 operates in Synchronous
mode.


PCINT28, Pin Change Interrupt Source 28: The PD4 pin can serve as an external interrupt source

Po setupu ročno nastavi DDRD.4 in PORTD.4

Preveri, da nimaš USART v sinhronskem načinu - DDD4 mora bit na 0.

[tiger]

rplink3r Hvala za odgovor. Sem probal rešit vendar mi ni uspelo. Bom reševal, ko bo več časa. Sedaj sem prestavil na A.