Hi GlenB,The errors you mention
Symbol 'DMA1_Channel1_IRQn' could not be resolved main.c Symbol 'DMA1_Channel1_IRQn' could not be resolved main.c Symbol 'SysTick_IRQn' could not be resolved main.care usually errors in symbol indexing caused by Eclipse. The compilation should work correctly if you build your project.
These errors are caused by the initial indexing of your project which is not finishing correctly as Eclipse tend to do that concurrently with project creation... To solve that you should right-click on your project then select Index >> Rebuild then, if the errors do not disapear, just select them in the Problems view and delete them.
Hope this helps,