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Re: DMA space的問題
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版主
 
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please see the Data Memory organization of PIC33F family that DMA buffer have 2K bytes only in the RAM from 0x2000 to 0x27ff. Therefore the BufferB can't be allocated.
Please also see the RTC of 204 ADV for more information: http://www.microchip.com.tw/modules/w ... glefile.php?cid=3&lid=233
發表於: 2009/4/27 17:22
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DMA space的問題
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新會員
 
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I was trying the do the following things"
ADC-> DMA->FFT For 256, 512points, it is fine. When I changed it to 1024points, the following error message comes out: ..\src\obj\testPlaceFFTnADC.o: Link Error: Could not allocate section BufferB, size = 2048 bytes, attributes = bss dma Link Error: Could not allocate data memory I think it somehow relate to the DMA buffer allocation. My DMA buffer declaration is below: fractional BufferA[NUMSAMP] __attribute__((space(dma),section ("BufferA"))); fractional BufferB[NUMSAMP] __attribute__((space(dma),section ("BufferB"))); Is there any limitation on the capacity of DMA space?
發表於: 2009/4/25 20:32
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