From 5507e14cd45612653342381d3caab54e43b61990 Mon Sep 17 00:00:00 2001
From: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Date: Thu, 9 May 2013 00:56:33 -0500
Subject: [PATCH] lm4f: Implement DMA enable/disable functions for the UART

Add basic rx/tx_dma_enable/disable functionality.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
---
 lib/lm4f/uart.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/lib/lm4f/uart.c b/lib/lm4f/uart.c
index e96af0f9..73ccc453 100644
--- a/lib/lm4f/uart.c
+++ b/lib/lm4f/uart.c
@@ -517,24 +517,44 @@ void uart_clear_interrupt_flag(u32 uart, enum uart_interrupt_flag ints)
  */
 /**@{*/
 
+/**
+ * \brief Enable the UART Receive DMA.
+ *
+ * @param[in] uart UART block register address base @ref uart_reg_base
+ */
 void uart_enable_rx_dma(u32 uart)
 {
-	/* TODO: this is just a stub. */
+	UART_DMACTL(uart) |= UART_DMACTL_RXDMAE;
 }
 
+/**
+ * \brief Disable the UART Receive DMA.
+ *
+ * @param[in] uart UART block register address base @ref uart_reg_base
+ */
 void uart_disable_rx_dma(u32 uart)
 {
-	/* TODO: this is just a stub. */
+	UART_DMACTL(uart) &= ~UART_DMACTL_RXDMAE;
 }
 
+/**
+ * \brief Enable the UART Transmit DMA.
+ *
+ * @param[in] uart UART block register address base @ref uart_reg_base
+ */
 void uart_enable_tx_dma(u32 uart)
 {
-	/* TODO: this is just a stub. */
+	UART_DMACTL(uart) |= UART_DMACTL_TXDMAE;
 }
 
+/**
+ * \brief Disable the UART Transmit DMA.
+ *
+ * @param[in] uart UART block register address base @ref uart_reg_base
+ */
 void uart_disable_tx_dma(u32 uart)
 {
-	/* TODO: this is just a stub. */
+	UART_DMACTL(uart) &= ~UART_DMACTL_TXDMAE;
 }
 /**@}*/