add patch file for DMA IRQ

Firmware/Board/v3/0003-disable-IRQ-for-DMA2_Stream0.patch

@@ -0,0 +1,33 @@
+From ab5ca860b3729d76a9c43c485776147ab69d2342 Mon Sep 17 00:00:00 2001
+From: Samuel Sadok <samuel.sadok@bluewin.ch>
+Date: Mon, 26 Mar 2018 19:02:45 -0700
+Subject: [PATCH] disable IRQ for DMA2_Stream0
+
+This DMA stream is used to read values from ADC1
+while ADC1 cycles through it's sequence of input
+channels. No interrupts are required to make
+this work.
+---
+ Firmware/Board/v3/Src/dma.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/Firmware/Board/v3/Src/dma.c b/Firmware/Board/v3/Src/dma.c
+index 55d5e03..3de873a 100644
+--- a/Firmware/Board/v3/Src/dma.c
++++ b/Firmware/Board/v3/Src/dma.c
+@@ -78,8 +78,10 @@ void MX_DMA_Init(void)
+   HAL_NVIC_SetPriority(DMA1_Stream4_IRQn, 5, 0);
+   HAL_NVIC_EnableIRQ(DMA1_Stream4_IRQn);
+   /* DMA2_Stream0_IRQn interrupt configuration */
+-  HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 5, 0);
+-  HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
++  // Dear STM, no we _don't_ want to fire an interrupt for this DMA
++  // (it's not possible to deselect this in CubeMX)
++  //HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 5, 0);
++  //HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
+ 
+ }
+ 
+-- 
+2.16.2
+