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a VHDL 16550 UART core: Tracker : Transmit Interrupt doesn't fire during a Single Byte Send Monitor this item You will be notified via email when status of this item is changed or if somebody adds a comment. Your email   Transmit Interrupt doesn't fire during a Single Byte Send Type BUG Status CLOSED Simulation of the UART shows that the transmit interrupt will be generated, as expected, even with a single byte transfer (the transmit FIFO becoming empty).   Stats Nobody is monitoring this item Progress   Submited date 18-Jun-2008 Submited by auchter@u...   Assigned date 19-Jun-2008 Assigned to Howard A. LeFevre   Closed date 19-Jun-2008 Closed by Howard A. LeFevre Comments by auchter@u... on 19-Jun-2008 And I forgot to add -- Thanks for the great core! And on top of that -- thank you for the rapid response! Regards, -Ben   by auchter@u... on 19-Jun-2008 Just to clear this one up on my end also -- we were able to figure it out -- the directory was not using the most up-to-date UART release. We were using the old (circa august) release of the UART. I apologize for the mix-up...   by auchter@u... on 18-Jun-2008 Here's some example code for you to get the idea. As you can see, I'm using a Xilinx microblaze system. There are three ports - A, B, and C. A is a uartlite hyperterm console for outputting printf's. I can provide this code as an attachment if desired. Mostly it's just to show how it's being used to produce the problem... #include "main.h" #include "xio.h" XUartNs550 UART_Port_C_16550_struct; XUartNs550 UART_Port_B_16550_struct; XUartNs550Format format; XIntc InterruptController; /* Variable Creation */ Xuint8 uart_buffer[16]; Xuint16 options; void PortC_Handler (void *CallBackRef, Xuint32 Event, unsigned int EventData) { Xuint8 Errors; XUartNs550 *UartNs550Ptr = (XUartNs550 *)CallBackRef; char dummy; int asdf; //xil_printf("Entered Port C Interrupt Handler\r\n"); if (Event == XUN_EVENT_SENT_DATA) { /* placeholder to allow breaking to occur here */ asdf = 42; xil_printf("Entered Port C Send Interrupt Handler\r\n"); } else if (Event == XUN_EVENT_RECV_DATA) { /* don't care what happens to the Rx'd byte */ XUartNs550_Recv (UartNs550Ptr, &dummy, 1); xil_printf("Entered Port C RECV Interrupt Handler\r\n"); } else { /* placeholder to allow breaking to occur here */ asdf = 999; xil_printf("Entered Port C Some other Interrupt Handler\r\n"); } } void PortB_Handler (void *CallBackRef, Xuint32 Event, unsigned int EventData) { Xuint8 Errors; XUartNs550 *UartNs550Ptr = (XUartNs550 *)CallBackRef; char dummy; int asdf; //xil_printf("Entered Port B Interrupt Handler\r\n"); if (Event == XUN_EVENT_SENT_DATA) { /* placeholder to allow breaking to occur here */ asdf = 42; xil_printf("Entered Port B Send Interrupt Handler\r\n"); } else if (Event == XUN_EVENT_RECV_DATA) { /* don't care what happens to the Rx'd byte */ XUartNs550_Recv (UartNs550Ptr, &dummy, 1); xil_printf("Entered Port B RECV Interrupt Handler\r\n"); } else { /* placeholder to allow breaking to occur here */ asdf = 999; xil_printf("Entered Port B Some other Interrupt Handler\r\n"); } } int main() { Xuint16 Options; XStatus Status; microblaze_enable_interrupts(); //Setup Interrupt System: Status = XIntc_Initialize(&InterruptController, XPAR_INTERRUPT_CONTROLLER_DEVICE_ID); /* Start the Interrupt Controller with interrupts enabled. */ Status = XIntc_Start(&InterruptController, XIN_REAL_MODE); /* Initialize */ XUartNs550_Initialize(&UART_Port_C_16550_struct, XPAR_PORTC_WISHBONE_BRIDGE_DEVICE_ID); XUartNs550_Initialize(&UART_Port_B_16550_struct, XPAR_PORTB_WISHBONE_BRIDGE_DEVICE_ID); Options = XUN_OPTION_DATA_INTR | XUN_OPTION_FIFOS_ENABLE | XUN_OPTION_RESET_TX_FIFO | XUN_OPTION_RESET_RX_FIFO; XUartNs550_SetOptions(&UART_Port_C_16550_struct, Options); XUartNs550_SetOptions(&UART_Port_B_16550_struct, Options); //Set defaults for UART Port B, C format.BaudRate = BAUD_RATE; format.DataBits = XUN_FORMAT_8_BITS; format.Parity = XUN_FORMAT_NO_PARITY; format.StopBits = XUN_FORMAT_1_STOP_BIT; XUartNs550_SetDataFormat(&UART_Port_C_16550_struct, &format); XUartNs550_SetDataFormat(&UART_Port_B_16550_struct, &format); //Connect device driver handlers: //PortC Status = XIntc_Connect(&InterruptController, SERC_UART_INTERRUPT_ID, (XInterruptHandler)XUartNs550_InterruptHandler, (void *)&UART_Port_C_16550_struct); XIntc_Enable(&InterruptController, SERC_UART_INTERRUPT_ID); //PortC //PortB Status = XIntc_Connect(&InterruptController, SERB_UART_INTERRUPT_ID, (XInterruptHandler)XUartNs550_InterruptHandler, (void *)&UART_Port_B_16550_struct); XIntc_Enable(&InterruptController, SERB_UART_INTERRUPT_ID); //PortB /* Setup the interrupt handlers for the devices */ XUartNs550_SetHandler(&UART_Port_C_16550_struct, PortC_Handler, &UART_Port_C_16550_struct); XUartNs550_SetHandler(&UART_Port_B_16550_struct, PortB_Handler, &UART_Port_B_16550_struct); unsigned int i; xil_printf("Starting Test\r\n"); for (i = 0; i < 100000000; i++) {} char *test2String = "!!"; char *test1String = "!"; /* send exactly 2 bytes, wait, then send 1 byte. * use GDB to confirm that the send interrupt is generated for the former * send, but not for the latter */ XUartNs550_Send (&UART_Port_C_16550_struct, test2String, 2); XUartNs550_Send (&UART_Port_B_16550_struct, test2String, 2); for (i = 0; i < 100000000; i++) {} XUartNs550_Send (&UART_Port_C_16550_struct, test1String, 1); XUartNs550_Send (&UART_Port_B_16550_struct, test1String, 1); while (1) {} //end printing Main Menu while loop }//end main() /* End of File */   Add your comment Your email: Retype key: