DSP II: ELEC 4523 Real-Time Data Exchange - Faculty

Real-Time Data Exchange Page 3/10read function. The RTDX_read function actually waits in a loop for the read to becompleted. It will not cause a task to enter the TSK_BLOCKED state.RTDX_readRTDX_readNBRTDX_write• Disable the channel after use. The functions to disable either an input or output channel aregiven below.RTDX_disableInputRTDX_disableOutputThis process is shown in the following code section where an SWI is set up to output data tothe host. In this example a single integer is sent to the host one time. Examine the code sectionan compare to the steps outlined above. This example assumes that the configuration tool is usedto set up DSP/BIOS and therefore the target does not need to be initialized./* create a global output channel */RTDX_CreateOutputChannel( ochan );void funSWI(){int data = 10; /* data to send to host */int status;/* enable the output channel */RTDX_enableOutput( &ochan );/* send the data to the host */status = RTDX_write( &ochan, &data, sizeof(data) );/* check the status of the write operation */if ( status == 0 ) {puts("ERROR: RTDX_write failed!\n" );exit(-1 );}}/* disable the channel after use */RTDX_disableOutput( &ochan );The next section of code shows a similar SWI set up to input an integer from the host.Notice that the structure of the code is the same as the above section of code./* create a global input channel */RTDX_CreateInputChannel( ichan );void funSWI(){int data;int status;/* enable the input channel */RTDX_enableInput( &ichan );/* send the data to the host */