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STM32F2 USART IDLE Detection

Question asked by HGlauß on Jun 30, 2012
Latest reply on Jun 30, 2012 by Andrew Neil

I'am using two STM32F207IG with the UART1's configured as RS232 (8n1,115200, no flowcontrol, asynch) connected via null-modem.

Each 10 µs the master sends a byte to the slave (status bit USART_SR_TC is set).

My problem:
Only at every second received byte the status bit USART_SR_IDLE is set.

I can't fix, if this a a problem of the master/transmitter of slave/receiver.