From 5512102f92b21d3dc2b7f759b432aa51bfe7a641 Mon Sep 17 00:00:00 2001
From: Richard Barry <ribarry@amazon.com>
Date: Wed, 31 Oct 2012 10:31:33 +0000
Subject: [PATCH] Slow configured clock in the RM48 and TMS570 demos to 50MHz.

---
 .../Demo/CORTEX_R4_RM48_TMS570_CCS5/.cproject |  2 +-
 .../FreeRTOSConfig.h                          |  2 +-
 .../Demo/CORTEX_R4_RM48_TMS570_CCS5/serial.c  |  4 ++-
 .../startup/sys_system.c                      | 31 +++++++++++++------
 4 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/.cproject b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/.cproject
index 4e6af3968..cc190703c 100644
--- a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/.cproject
+++ b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/.cproject
@@ -200,7 +200,7 @@
 								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.FLOAT_SUPPORT.181229071" name="Specify floating point support (--float_support)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.FLOAT_SUPPORT" value="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.FLOAT_SUPPORT.VFPv3D16" valueType="enumerated"/>
 								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.ABI.972870798" name="Application binary interface (tiabi, ti_arm9_abi, eabi) (--abi)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.ABI" value="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.ABI.eabi" valueType="enumerated"/>
 								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.ENUM_TYPE.1607856814" name="Designate enum type (Default is packed for EABI) (--enum_type)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.ENUM_TYPE" value="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.ENUM_TYPE.packed" valueType="enumerated"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_LEVEL.release.1826615201" name="Optimization level (--opt_level, -O)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_LEVEL.release" value="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_LEVEL.3" valueType="enumerated"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_LEVEL.release.1826615201" name="Optimization level (--opt_level, -O)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_LEVEL.release" value="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_LEVEL.4" valueType="enumerated"/>
 								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_FOR_SPEED.1928323899" name="Optimize for speed (--opt_for_speed, -mf)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_FOR_SPEED" value="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.OPT_FOR_SPEED.5" valueType="enumerated"/>
 								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.DEBUGGING_MODEL.43248373" name="Debugging model" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.DEBUGGING_MODEL" value="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.DEBUGGING_MODEL.SYMDEBUG__DWARF" valueType="enumerated"/>
 								<option id="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.INCLUDE_PATH.403820922" name="Add dir to #include search path (--include_path, -I)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_4.9.compilerID.INCLUDE_PATH" valueType="includePath">
diff --git a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/FreeRTOSConfig.h b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/FreeRTOSConfig.h
index 808b6da34..1dae269d1 100644
--- a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/FreeRTOSConfig.h
+++ b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/FreeRTOSConfig.h
@@ -95,7 +95,7 @@
 #define configUSE_TICK_HOOK			  			1
 #define configUSE_TRACE_FACILITY	  			0
 #define configUSE_16_BIT_TICKS		  			0
-#define configCPU_CLOCK_HZ			  			( ( unsigned portLONG ) 90000000 ) /* Timer clock. */
+#define configCPU_CLOCK_HZ			  			( ( unsigned portLONG ) 50000000 ) /* Timer clock. */
 #define configTICK_RATE_HZ			  			( ( portTickType ) 1000 )
 #define configMAX_PRIORITIES		  			( 8 )
 #define configMINIMAL_STACK_SIZE	  			( ( unsigned portSHORT ) 128 )
diff --git a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/serial.c b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/serial.c
index 46da7308c..2424421de 100644
--- a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/serial.c
+++ b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/serial.c
@@ -125,6 +125,8 @@
 #define serialVIM_REQMASKSET0_REG	( * ( ( volatile unsigned long * ) 0xFFFFFE30 ) )
 #define serialVIM_SCIHINT_RAM       ( * ( ( void (**)(void) ) 0xFFF82038 ) )
 
+/* Baudrate */
+#define serialBAURATE     	19200.0			/* Baudrate in Hz */
 
 /*-----------------------------------------------------------*/
 
@@ -174,7 +176,7 @@ xComPortHandle xReturn = ( xComPortHandle ) 0;
 	    /* Global control 1 */
 		serialSCI_GCR1_REG = 0x03010032UL;
 	    /* Baudrate */
-		serialSCI_BAUD_REG = 292;
+		serialSCI_BAUD_REG = ((unsigned long)((configCPU_CLOCK_HZ / (16.0 * serialBAURATE) + 0.5)) - 1) & 0x00FFFFFF;
 	    /* Transmission length (8-bit) */
 		serialSCI_LENGTH_REG = 8 - 1;
 	    /* Set SCI pins functional mode */
diff --git a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/startup/sys_system.c b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/startup/sys_system.c
index 378210b7f..2988ed93d 100644
--- a/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/startup/sys_system.c
+++ b/FreeRTOS/Demo/CORTEX_R4_RM48_TMS570_CCS5/startup/sys_system.c
@@ -16,24 +16,26 @@
 
 #include "sys_system.h"
 
-
-/** @fn void systemInit(void)
-*   @brief Initializes System Driver
-*
-*   This function initializes the System driver.
-*
-*/
-
+#define startupCPU_100MHZ 1
 
 void systemInit(void)
 {
     /** @b Initialize @b Flash @b Wrapper: */
 
     /** - Setup flash read mode, address wait states and data wait states */
+#if	startupCPU_100MHZ == 1
+	/* 100MHz */
+    flashWREG->FRDCNTL =  0x01000000U
+                       | (2U << 8U)
+                       | (0U << 4U)
+                       |  1U;
+#else
+    /* 180MHz */
     flashWREG->FRDCNTL =  0x01000000U 
                        | (3U << 8U) 
                        | (1U << 4U) 
                        |  1U;
+#endif
 
 #if 0
     /** - Setup flash bank power modes */
@@ -77,6 +79,15 @@ void systemInit(void)
     *     - Setup Pll multiplier          
     */
 
+#if	startupCPU_100MHZ == 1
+	/* 100MHz */
+    systemREG1->PLLCTL1 =  0x00000000U
+                        |  0x20000000U
+                        | (0U << 24U)
+                        |  0x00000000U
+                        | (5U << 16U)
+                        | (74U << 8U);
+#else
     /* 180Mhz */
     systemREG1->PLLCTL1 =  0x00000000U 
                         |  0x20000000U 
@@ -84,6 +95,7 @@ void systemInit(void)
                         |  0x00000000U 
                         | (5U << 16U) 
                         | (134U << 8U);
+#endif
 
     /** - Setup pll control register 1 
     *     - Enable/Disable frequency modulation
@@ -131,8 +143,9 @@ void systemInit(void)
                           | 1U;
 
     /** - Setup RTICLK1 and RTICLK2 clocks */
+    /* 90MHz (180Mhz/2) */
     systemREG1->RCLKSRC = (1U << 24U)
-                        | (SYS_VCLK << 16U) 
+                        | (SYS_VCLK << 16U)
                         | (1U << 8U)  
                         |  SYS_VCLK;