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ARM: Using CMSIS GPDMA driver in custom scripts

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I've rewritten an UART driver since I was not happy with the CSMIS one. Now I want to use GPDMA_LPC17xx in this driver. Including the header file: #include "GPDMA_LPC17xx.h" // Keil::Device:GPDMA This gives me problems using the GPDMA functions (of course, there are extern declarations there) Error: L6218E: Undefined symbol GPDMA_Initialize() (referred from uartcontroller.o). Error: L6218E: Undefined symbol GPDMA_ChannelConfigure(unsi

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