We are working on a project using the 21479 (specifically because of power considerations) with the CrossCore tools, and are having a problem creating I/O support for the UART such that it can be accessed as a stream. We need to be able to read and write binary data and provide a higher-level interface for our customer (fprintf, etc).
We have a simple UART_putchar() and UART_getchar() basically working, but the problem is adding the UART as a device. We have been following EE-347 and adapting it to the SHARC, but we just get garbage out the UART (and occasionally the correct first character of the string) when anything comes out at all.
Can you point us to example code implementing this? I’ve enclosed a .zip of example code, but I have reproduced the high-level setup here:
int PrimDevId = get_default_io_device(); //Debugger console for printfs
int SecDevId = add_devtab_entry(&UART_DevEntry); //UART for fprintfs
set_default_io_device(SecDevId); //Temporarily set uart as primary device
pUartIOFile = fopen("uart","r+w"); //open a dummy file on the now primary UART device
if(setvbuf(pUartIOFile,buf,_IOLBF,sizeof(buf)) == -1) //Setup a buffer on the UART device
printf("Error setting UART buffer \n");
if(pUartIOFile == NULL)
printf("Error setting opening UART\n");
set_default_io_device(PrimDevId); //Set the primary device back to debugger console for printfs
fprintf(pUartIOFile,"UART test print.\n"); // If anything, get garbage; occasionally “U” along with.
` printf(“After UART fprintf”);
Both if statements pass (are not executed) and we get the correct SecDevid back from add_devtab_entry().
The program pointer seems to be unable to increment if you break at the fprintf or thereafter.