From d5ee5fef3e33c7fe634a0b416394be9a5aacaf60 Mon Sep 17 00:00:00 2001
From: Marti Bolivar <mbolivar@leaflabs.com>
Date: Mon, 25 Apr 2011 22:08:30 -0400
Subject: Adding rcc_dev_clk(), an accessor for a peripheral's clock line.

---
 libmaple/rcc.c | 23 +++++++++++++++--------
 libmaple/rcc.h |  8 ++++++++
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/libmaple/rcc.c b/libmaple/rcc.c
index 78abbcf..efb2599 100644
--- a/libmaple/rcc.c
+++ b/libmaple/rcc.c
@@ -32,14 +32,12 @@
 #include "rcc.h"
 #include "bitband.h"
 
-enum {
-    APB1,
-    APB2,
-    AHB
-};
+#define APB1                            RCC_APB1
+#define APB2                            RCC_APB2
+#define AHB                             RCC_AHB
 
 struct rcc_dev_info {
-    const uint8 clk_domain;
+    const rcc_clk_domain clk_domain;
     const uint8 line_num;
 };
 
@@ -149,7 +147,7 @@ void rcc_clk_enable(rcc_clk_id device) {
         [AHB] = &RCC_BASE->AHBENR,
     };
 
-    uint8 clk_domain = rcc_dev_table[device].clk_domain;
+    rcc_clk_domain clk_domain = rcc_dev_clk(device);
     __io uint32* enr = (__io uint32*)enable_regs[clk_domain];
     uint8 lnum = rcc_dev_table[device].line_num;
 
@@ -166,7 +164,7 @@ void rcc_reset_dev(rcc_clk_id device) {
         [APB2] = &RCC_BASE->APB2RSTR,
     };
 
-    uint8 clk_domain = rcc_dev_table[device].clk_domain;
+    rcc_clk_domain clk_domain = rcc_dev_clk(device);
     __io void* addr = (__io void*)reset_regs[clk_domain];
     uint8 lnum = rcc_dev_table[device].line_num;
 
@@ -174,6 +172,15 @@ void rcc_reset_dev(rcc_clk_id device) {
     bb_peri_set_bit(addr, lnum, 0);
 }
 
+/**
+ * @brief Get a device's clock domain
+ * @param device Device whose clock domain to return
+ * @return Device's clock source
+ */
+rcc_clk_domain rcc_dev_clk(rcc_clk_id device) {
+    return rcc_dev_table[device].clk_domain;
+}
+
 /**
  * @brief Set the divider on a device prescaler
  * @param prescaler prescaler to set
diff --git a/libmaple/rcc.h b/libmaple/rcc.h
index 91f77d0..08f8977 100644
--- a/libmaple/rcc.h
+++ b/libmaple/rcc.h
@@ -484,6 +484,14 @@ void rcc_clk_init(rcc_sysclk_src sysclk_src,
 void rcc_clk_enable(rcc_clk_id device);
 void rcc_reset_dev(rcc_clk_id device);
 
+typedef enum rcc_clk_domain {
+    RCC_APB1,
+    RCC_APB2,
+    RCC_AHB
+} rcc_clk_domain;
+
+rcc_clk_domain rcc_dev_clk(rcc_clk_id device);
+
 /**
  * Prescaler identifiers
  * @see rcc_set_prescaler()
-- 
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