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Override DMA IRQ handler?

Hello
I am modifying a Keil example program (MCBSTM32C HTTP-SERVER) so that you can upload via HTTP. A second thing it has to do is write the uploaded data to the DAC. For this I want to use the DMA. The DMA is working fine, but the problem is that RTX needs the DMA_STM32F10x.c driver. I've made a test project where I'm using the stdPeriph DMA driver. I need to use the DMA IRQ handler, but the DMA_STM32F10x.c file has already all IRQ handlers defined and the file is locked. Is there anyway I can override the IRQ handler from that file and make my own?

Thanks in advance

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