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  1. Hi, I am working on a project where i use four UART for an application, all four uart lines sends and receives approx. 20 bytes of characters and expects 20 bytes o character in every 16 milliseconds. And the data transfer will be continuous. NOTE : All four UARTs, are on PL side and controlled by PS of my zynq SoC.. NODE B : Zybo NODE A : Subsystem The UART communication is between NODE A and NODE B. NODE A sends data to NODE B, in turn NODE B should receive the data and reply with an acknowledgement. In this case NODE B is my Zybo Node A is another subsystem. So the data transmission is initiated by NODE A and the control is with NODE A. NODE A will Enable the data transmission for all four UARTs. Now the problem which i am facing is, when NODE A enables the transmission for any two of the UART lines the data transmission is smooth, the problem arises only when i enable the other two. Which means the zybo is not capable of attending to those interrupts which is simultaneously coming from NODE A through four UART lines. My data contains Start byte and Stop byte, Both Start and stop byte are same character. I will attach a my Interrupt handler for reference. **************NOTE************** UART IP on PL side : UART16550 Type of UART : Interrupt driven. Software used : Vivado 2018.3 and SDK Bare metal software. UART interrupt priority : equal priority for all four UARTs. ********************************** I am not very sure about how to use four UARTs efficiently with my Zybo . Please help me with the problem, any inputs from your side will be appreciated. The following is my UART interrupt handler. *************************************************************************** static void RW1RecvHandler(void *CallBackRef, unsigned int EventData) { int i, ch, RecvCount, index; RecvCount = EventData; // repeat this loop for all chars received, i.e., for all ReceivedCount i = 0; while (i < RecvCount) { ch = RW1_RecieveBuffer[i++]; // get the received char from the buffer if(RW1_Start_byte_flag == 1) { // Stop Byte Check for RW1 if (ch == 0xc0) { // Ignore one of the two successive start byte characters if (RW1_ReceivedCount > 1) { RW1_Start_byte_flag = 0; RW1_Buffer[RW1_ReceivedCount++] = ch; RW1_Frame_complete_flag = 1; } } else { if ((index = RW1_ReceivedCount) < TEST_BUFFER_SIZE) { RW1_Buffer[index] = ch; RW1_ReceivedCount++; } else RW1_Start_byte_flag = 0; } } // Start Byte Check for RW1 else if (ch == 0xc0) { RW1_Start_byte_flag = 1; RW1_ReceivedCount = 0; RW1_Buffer[RW1_ReceivedCount++] = ch; // Note the cpu time when first character is received XTime_GetTime(&t_start_RW1); RW1_Frame_complete_flag = 0; } } if(RW1_Frame_complete_flag == 0) { // set up the buffer for next char in interrupt mode XUartNs550_Recv(&RW1, RW1_RecieveBuffer, 1); } } Thanks & Regards Ajeeth Kumar
  2. Hi people, What I mean is that, can I write a program such that it can program the FPGA while executing? Thanks!