From c0e1b4cdf20c55f2cbbdf3a5889f447974135fd8 Mon Sep 17 00:00:00 2001
From: Josh Rahm <joshuarahm@gmail.com>
Date: Mon, 16 Nov 2020 21:02:48 -0700
Subject: Got the DMA to send a simple message through UART2.

---
 02-usart/src/usart.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to '02-usart/src/usart.c')

diff --git a/02-usart/src/usart.c b/02-usart/src/usart.c
index 42297a8..d4073d0 100644
--- a/02-usart/src/usart.c
+++ b/02-usart/src/usart.c
@@ -78,3 +78,21 @@ void usart_transmit_str_sync(__IO usart_t* usart, const char* str)
     usart_transmit_byte_sync(usart, *(str ++));
   }
 }
+
+void usart_enable_dma(__IO usart_t* usart, usart_enable_t enabled)
+{
+  switch(enabled) {
+    case USART_ENABLE_DISABLED:
+      usart->c3_bf.dmar = 0;
+      usart->c3_bf.dmat = 0;
+      break;
+
+    case USART_ENABLE_TX:
+      usart->c3_bf.dmat = 1;
+      break;
+
+    case USART_ENABLE_RX:
+      usart->c3_bf.dmar = 1;
+      break;
+  };
+}
-- 
cgit