not possible to receive data through DMA (McBSP)
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From: rrnairamc on 25 May 2010 10:27 Dear all i am trying to implement a McBSP transfer through DMA . i can transmit data through MCBsp using DMA but couldn't receive . i checked by polling the RXRD bit, data is coming , but when i changed it to DMA it is not working . hope experts in this group can help me in this case Thanks in advance for your valuable time Raj
From: Tim Wescott on 25 May 2010 11:34 On 05/25/2010 07:27 AM, rrnairamc wrote: > Dear all > i am trying to implement a McBSP transfer through DMA . i can transmit data > through MCBsp using DMA but couldn't receive . i checked by polling the > RXRD bit, data is coming , but when i changed it to DMA it is not working > . hope experts in this group can help me in this case > > > Thanks in advance for your valuable time 1: There are a lot of different processors in the world, and they all have different peripherals. Even calling the peripheral a McBSP only narrows it down to one company (TI?), but within that companies product line you can still expect wide variation. You need to say what processor you're using. 2: This is really more a DSP algorithms group, although quite a few of us do implement those algorithms on embedded DSP chips. You may find a larger group of people to help with this on comp.arch.embedded -- were I to ask a question like this I would cross post it (_not_ multiple post!) over there in hopes of netting an answer. If it is a TI part then you have a bazillion manuals to read; regardless of whether it's TI or Analog or FreeScale chances are high that you have failed to set up one important bit or another, and you just have to flog the manuals and the software until you figure out what you've done. Make sure that all the relevant sections are turned on, and that any inter-section signaling is turned on. You may want to make sure that you can receive data _without_ DMA if that's an option -- usually that's easier, and it's a good way to verify that you have everything working right up to the point of getting the DMA transfer going. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: Randy Yates on 26 May 2010 22:03 Tim Wescott <tim(a)seemywebsite.now> writes: > 2: This is really more a DSP algorithms group, I've been here since 1993 and, while there are definitely more algorithm discussions than hardware discussions, this group has traditionally encompassed (and welcomed) both. -- Randy Yates % "I met someone who looks alot like you, Digital Signal Labs % she does the things you do, mailto://yates(a)ieee.org % but she is an IBM." http://www.digitalsignallabs.com % 'Yours Truly, 2095', *Time*, ELO
From: Randy Yates on 26 May 2010 22:06 "rrnairamc" <rrnairamc(a)n_o_s_p_a_m.yahoo.com> writes: > Dear all > i am trying to implement a McBSP transfer through DMA . i can transmit data > through MCBsp using DMA but couldn't receive . i checked by polling the > RXRD bit, data is coming , but when i changed it to DMA it is not working > . hope experts in this group can help me in this case We possibly could, but you need to give us quite a bit more information. For example, which processor are you using and how exactly are you setting up the DMA? -- Randy Yates % "With time with what you've learned, Digital Signal Labs % they'll kiss the ground you walk mailto://yates(a)ieee.org % upon." http://www.digitalsignallabs.com % '21st Century Man', *Time*, ELO
From: Jerry Avins on 26 May 2010 22:07
On 5/26/2010 10:03 PM, Randy Yates wrote: > Tim Wescott<tim(a)seemywebsite.now> writes: > >> 2: This is really more a DSP algorithms group, > > I've been here since 1993 and, while there are definitely more algorithm > discussions than hardware discussions, this group has traditionally > encompassed (and welcomed) both. Welcomed here, of course, but comp.arch.embedded is a too-often overlooked resource. Jerry -- Engineering is the art of making what you want from things you can get. ����������������������������������������������������������������������� |