PSoC™ 5, 3 & 1 Forum Discussions

I modified the ADC Filter VDAC example to have an additional DMA for transferring data from filter to VDAC. The project is attached. I compiled it and downloaded to PSoC3 030 board. The DMA for ADC to Filter input is operating, but DMA for Filter to VDAC.

 we can control a fan using a microcontroller so why we use a psoc to control the fan.because microcontroller is very cheap than psoc kit. why we waste the money when we can control using  a simple and cheap microcontroller.   

 DMA is used in direct memory access to  input -output peripherals.but i want to know that, where it can use in real life applications and what is its importance? if we do not use it what will happen

 DMA is used in direct memory access to  input -output peripherals.but i want to know that, where it can use in real life applications and what is its importance? if we do not use it what will happen.

 When there are multiple DMAs and multiple TDs asigned for each channel it is better to have the DMA configurations as BYTES_PER_BURST as  1 and Request per Burst 0. The reason why this configuration is good is - I came across a case where in DMA configuration was Bytes_PER_BURST was set as total bytes to be transferred and Request_Per_Burst as 1.

The above configuration should work perfectly but due to some unknown reasons the DMAs are getting halted. I think SriHari started conversation on DMAs getting halted.

So when you are using multiple DMAs with many no. of TDs for each channel please try configuring as mentioned in 2nd line and AUTO_EXECUTE_NEXT_TD to the TDs which make up the complete data transfer.

 What is the best method to measure time for an operation......I tried using a pin and toggling it within a for loop continuosly......But even time is taken for setting the pin and resetting it.....Any other ideas......

 I got a doubt in DMA configuration, when the Burst Count is set to 1 and request per burst set to 0 what will the DMA do......

I think DMA works as per the TD configuration, if 2 TDs are present one transferring 4 and other also 4 then DMA  will transfer all 8 bytes per 1 request....But the request per burst is set 0!!!!......Is DMA wrong ...or is the configuration invalid