Add DMA header file which defines the DMA registers and add

testing_harness with fake environment to allow testing on x86
development machines.

1 files changed, 27 insertions, 0 deletions

diff --git a/02-usart/tests/test_dma.c b/02-usart/tests/test_dma.c
new file mode 100644
index 0000000..7c2127a
--- /dev/null
+++ b/02-usart/tests/test_dma.c
@@ -0,0 +1,27 @@
+#include "test_harness.h"
+#include "dma.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <memory.h>
+
+TEST(dma, smoke) {
+  dma_t* dma = &DMA1;
+  memset(dma, sizeof(dma), 0);
+
+  dma->is_bf.tcif1 = 1;
+  ASSERT_EQ(dma->is_r, 2);
+
+  dma->is_bf.htif7 = 1;
+  ASSERT_EQ(dma->is_r, 67108866);
+}
+
+TEST(dma, correct_align)
+{
+  dma_t dma;
+
+  // Assert the DMA registers are aligned with what the spec says.
+  ASSERT_EQ((long)(&dma.csel_r) - (long)(&dma), 0xA8);
+
+  return 0;
+}