Got the DMA to send a simple message through UART2.

1 files changed, 17 insertions, 1 deletions

diff --git a/02-usart/include/rcc.h b/02-usart/include/rcc.h
index 7ed4dee..05f5e5f 100644
--- a/02-usart/include/rcc.h
+++ b/02-usart/include/rcc.h
@@ -33,7 +33,21 @@ typedef struct {
 
   __IO uint32_t reserved_4; /* Not used. offset 0x44. */
 
-  __IO uint32_t ahb1en_r; /* AHB1 Peripheral enable register. 0x48 */
+  __IO union {
+    __IO uint32_t ahb1en_r; /* AHB1 Peripheral enable register. 0x48 */
+    struct {
+      bits_t dma1en:1; /* DMA1 clock enable. */
+      bits_t dma2en:1; /* DMA2 clock enable. */
+      bits_t reserved0:6;
+      bits_t flashen:1; /* Flash memory interface clock enable. */
+      bits_t reserved1:3;
+      bits_t crcen:1; /* CRC clock enable. */
+      bits_t reserved2:3;
+      bits_t tscen:1; /* Touch sensing controller clock enable. */
+      bits_t dmad2en:1; /* DMA2D clock enabled. */
+      bits_t reserved3:14;
+    } ahb1en_bf;
+  };
   __IO uint32_t ahb2en_r; /* AHB2 Peripheral enable register. 0x4C */
   __IO uint32_t ahb3en_r; /* AHB3 Peripheral enable register. 0x50 */
 
@@ -60,6 +74,8 @@ typedef struct {
   __IO uint32_t ccip_r; /* 0x88 */
 } PACKED rcc_t;
 
+static_assert(offsetof(rcc_t, ccip_r) == 0x88, "Offset check failed.");
+
 #define RCC (*(__IO rcc_t*)RCC_BASE)
 
 /* Macros to operate on the RCC registers. */