simple uart enabled.

1 files changed, 25 insertions, 9 deletions

diff --git a/usart/src/usart.c b/usart/src/usart.c
index 23dbd95..eddfbe7 100644
--- a/usart/src/usart.c
+++ b/usart/src/usart.c
@@ -40,16 +40,15 @@ void usart_set_parity(__IO usart_t* usart, usart_parity_t parity)
 void usart_set_enabled(__IO usart_t* usart, usart_enable_t enabled)
 {
   uint32_t c_r1 = usart->c_r1;
-  /* Clear relevant bits. */
-  c_r1 &= ~USART_ENABLE_TX_RX;
 
-  /* Set TX/RX enabled, but not actually USART enabled. */
-  c_r1 |= (enabled & ~1);
-
-  /* Set usart enabled bit separately. */
-  c_r1 |= enabled & 1;
-
-  usart->c_r1 = c_r1;
+  if (!enabled) {
+    usart->c1_bf.ue = 0;
+  } else {
+    /* Set the rx enabled. */
+    usart->c1_bf.re = !!(enabled & USART_ENABLE_RX);
+    usart->c1_bf.te = !!(enabled & USART_ENABLE_TX);
+    usart->c1_bf.ue = 1;
+  }
 }
 
 void usart_transmit_byte(__IO usart_t* usart, uint8_t byte)
@@ -62,3 +61,20 @@ void usart_transmit_byte(__IO usart_t* usart, uint8_t byte)
   while (!(usart->is_r & BIT(7)))
     ;
 }
+
+void usart_transmit_bytes(__IO usart_t* usart, const uint8_t* bytes, uint32_t n)
+{
+  while (n --) {
+    usart_transmit_byte(usart, *(bytes ++));
+  }
+}
+
+void usart_transmit_str(__IO usart_t* usart, const char* str)
+{
+  while (*str) {
+    if (*str == '\n') {
+      usart_transmit_byte(usart, '\r');
+    }
+    usart_transmit_byte(usart, *(str ++));
+  }
+}