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Hi, I am trying to write functions to transmit and receive data thru Linkports using DMA. As I am working on the simulator, I am assigning same port to both the Tx and Rx Link Buffers. I am performing the following functions: 1. LAR settings to assign a port TxBuf and RxBuf. 2. LCOM setting 3. Transmit() { i. Initialize DMA parameter registers corresponding to TxBuf. ii. Enable TxBuf in Tx mode with DMA enabled, by writing appropriate bits of LCTL. (RxLBUF is not yet enabled). } 4. Receive() { i. Initialize DMA parameter registers corresponding to RxBuf. ii. Enable RxBuf in Rx mode with DMA enabled, by writing appropriate bits of LCTL. (RxLBUF is enabled now). iii. Enable interrupt on Receive buffer. } What is happening is, after enabling TxBuf, it gives an error message reading "Port doesn't exist or isn't opened", and halts. What could be the reason for this? If I perform a loopback by enabling both the buffers simultaneously, it's working fine. Could anybody plz explain me the reasons behind it. Thanks and Regards, P Narayana Swamy |
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Query regarding Simulating LinkPorts for 21060 using VDSP++
Started by ●February 1, 2002
Reply by ●February 1, 20022002-02-01
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I haven't read up on the 21160 chips yet, but I'm not sure what
you are trying to do by assigning the same port to both receive and transmit?? This won't work. The way to simulate serial and link port dmas is to either put them in loopback mode or use the Simulator and setup a file stream. (under Settings-> Streams). You can specify a file with data in it and assign that to your port. The error you mentioned is typically generated when you don't set this up in the simulator or, your port control settings are conflicting. Cheers Bhaskar --- In adsp@y..., "pnswamy" <pnswamy@s...> wrote: > Hi, > I am trying to write functions to transmit and receive data thru Linkports using DMA. > As I am working on the simulator, I am assigning same port to both the Tx and Rx Link Buffers. I am performing the following functions: > 1. LAR settings to assign a port TxBuf and RxBuf. > 2. LCOM setting > 3. Transmit() > { > i. Initialize DMA parameter registers corresponding to TxBuf. > ii. Enable TxBuf in Tx mode with DMA enabled, by writing appropriate bits of LCTL. > (RxLBUF is not yet enabled). > } > 4. Receive() > { > i. Initialize DMA parameter registers corresponding to RxBuf. > ii. Enable RxBuf in Rx mode with DMA enabled, by writing appropriate bits of LCTL. > (RxLBUF is enabled now). > iii. Enable interrupt on Receive buffer. > } > What is happening is, after enabling TxBuf, it gives an error message reading "Port doesn't exist or isn't opened", and halts. > > What could be the reason for this? > If I perform a loopback by enabling both the buffers simultaneously, it's working fine. > > Could anybody plz explain me the reasons behind it. > > Thanks and Regards, > P Narayana Swamy |
