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STM32L0 with 2 USART ports in combined mode problem

Question asked by kosakovski.evgeni on Dec 27, 2015
Hi.

I am trying to work with STM32L051x8 MCU (IAR 7.2 IDE) with 2 USART ports in combined mode:
1)      RX define and operate in Interrupt mode.
2)      TX define and operate in DMA mode.

When I configure RX and TX to IRQ mode I view both RX and TX operations. But in combined mode (as described below) I don't view any activity on USART communication.
Attached very simple project with combined configuration. For start DMA transaction I set variable "ready" = '1'.
Can you help to find the problem: why communication does not work?

Thanks.
Evgeni

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