1 files changed, 22 insertions, 0 deletions
diff --git a/tests/test_usart.c b/tests/test_usart.c
new file mode 100644
index 0000000..b19d687
--- /dev/null
+++ b/tests/test_usart.c
@@ -0,0 +1,22 @@
+#include "test_harness.h"
+#include "arch/stm32l4xxx/peripherals/usart.h"
+
+#include <stdlib.h>
+
+TEST(usart, enable_dma)
+{
+  __IO usart_t* usart = &USART1;
+
+  usart->c_r3 = 0;
+
+  usart_enable_dma(usart, USART_ENABLE_TX);
+  ASSERT_EQ(usart->c_r3, 128);
+
+  usart_enable_dma(usart, USART_ENABLE_RX);
+  ASSERT_EQ(usart->c_r3, 192);
+
+  usart_enable_dma(usart, USART_ENABLE_DISABLED);
+  ASSERT_EQ(usart->c_r3, 0);
+
+  return 0;
+}