void OS_CPU_SysTickInit (void)
{
INT32U cnts;
cnts = OS_CPU_SysTickClkFreq() / OS_TICKS_PER_SEC;
OS_CPU_CM3_NVIC_ST_RELOAD = (cnts - 1);
/* Enable timer. */
OS_CPU_CM3_NVIC_ST_CTRL |= OS_CPU_CM3_NVIC_ST_CTRL_CLK_SRC | OS_CPU_CM3_NVIC_ST_CTRL_ENABLE;
/* Enable timer interrupt. */
OS_CPU_CM3_NVIC_ST_CTRL |= OS_CPU_CM3_NVIC_ST_CTRL_INTEN;
}
void OS_CPU_SysTickInit (void)
{
INT32U cnts;
cnts = OS_CPU_SysTickClkFreq() / OS_TICKS_PER_SEC;
OS_CPU_CM3_NVIC_ST_RELOAD = (cnts - 1);
/* Set prio of SysTick handler to min prio. */
OS_CPU_CM3_NVIC_PRIO_ST = OS_CPU_CM3_NVIC_PRIO_MIN;
/* Enable timer. */
OS_CPU_CM3_NVIC_ST_CTRL |= OS_CPU_CM3_NVIC_ST_CTRL_CLK_SRC | OS_CPU_CM3_NVIC_ST_CTRL_ENABLE;
/* Enable timer interrupt. */
OS_CPU_CM3_NVIC_ST_CTRL |= OS_CPU_CM3_NVIC_ST_CTRL_INTEN;
}
/*
*********************************************************************************************************
* AppTaskStart()
*
* Description : The startup task. The uC/OS-III ticker should only be initialize once multitasking starts.
*
* Argument(s) : p_arg Argument passed to 'AppTaskStart()' by 'OSTaskCreate()'.
*
* Return(s) : none.
*
* Note(s) : (1) The first line of code is used to prevent a compiler warning because 'p_arg' is not
* used. The compiler should not generate any code for this statement.
*
* (2) Interrupts are enabled once the task starts because the I-bit of the CCR register was
* set to 0 by 'OSTaskCreate()'.
*********************************************************************************************************
*/
static void App_TaskStart(void *p_arg)
{
uint16_t osVersion1, osVersion2, osVersion3;
OS_ERR err = OS_ERR_NONE;
(void)p_arg; /* Note(1) */
/* Initialize BSP functions */
BSPOS_Init();
/* Initialize the uC/OS-III ticker */
OS_CPU_SysTickInit(OS_CPU_SysTickClkFreq() / OS_CFG_TICK_RATE_HZ);
#if (OS_TASK_STAT_EN > 0U)
/* Determine CPU capacity */
OSStatInit();
#endif
/* Create application tasks */
App_TaskCreate();
/* Create application mailboxes */
App_MailboxCreate();
/* Enable RS232A peripheral */
BSP_PeripheralAccess(BSP_RS232A, true);
/* Initialize Serial */
RETARGET_SerialInit();
/* Map LF to CRLF */
RETARGET_SerialCrLf(1);
/* Initialize LCD */
SegmentLCD_Init(true);
/* Turn gecko symbol ON */
SegmentLCD_Symbol(LCD_SYMBOL_GECKO, 1);
/* Turn EFM32 symbol ON */
SegmentLCD_Symbol(LCD_SYMBOL_EFM32, 1);
/* Write welcome message on LCD */
SegmentLCD_Write("uC/OS-3");
osVersion3 = OSVersion( &err );
osVersion1 = osVersion3 / 10000;
osVersion3 -= osVersion1 * 10000;
osVersion2 = osVersion3 / 100;
osVersion3 -= osVersion2 * 100;
osVersion3 %= 100;
/* Write welcome message on serial */
printf("\n*****************************************************************************");
printf("\n uC/OS-III v%d.%02d.%02d on Energy Micro EFM32 DVK ",
osVersion1, osVersion2, osVersion3 );
printf("\n Demo Application \n");
printf("\n uC/OS-III ");
printf("\n \"The real time kernel\" ");
printf("\n www.micrium.com ");
printf("\n\n is running on ");
printf("\n\n Energy Micro EFM32 ");
printf("\n \"The world's most energy friendly microcontrollers\" ");
printf("\n www.energymicro.com \n");
printf("\nDescription:");
printf("\nTask1: LED blink task");
printf("\nTask2: Receives characters from serial and posts message to Task3");
printf("\nTask3: Receives message from Task2 and writes it on LCD and serial ");
printf("\n*****************************************************************************\n");
printf("\nStart typing...\n");
/* Suspend this task as it is only used once in one Reset cycle */
OSTaskSuspend(&AppTaskStartTCB, &err);
/* Error had occured if code execution reached this point as suspend calls the scheduler
* that performs a context switch */
while (1U) ;
}
/*
*********************************************************************************************************
* AppTaskStart()
*
* Description : The startup task. The uC/OS-III ticker should only be initialize once multitasking starts.
*
* Argument(s) : p_arg Argument passed to 'AppTaskStart()' by 'OSTaskCreate()'.
*
* Return(s) : none.
*
* Note(s) : (1) The first line of code is used to prevent a compiler warning because 'p_arg' is not
* used. The compiler should not generate any code for this statement.
*
* (2) Interrupts are enabled once the task starts because the I-bit of the CCR register was
* set to 0 by 'OSTaskCreate()'.
*********************************************************************************************************
*/
static void App_TaskStart(void *p_arg)
{
uint16_t osVersion1, osVersion2, osVersion3;
OS_ERR err = OS_ERR_NONE;
(void)p_arg; /* Note(1) */
/* Initialize BSP functions */
BSPOS_Init();
/* Initialize the uC/OS-III ticker */
OS_CPU_SysTickInit(OS_CPU_SysTickClkFreq() / OS_CFG_TICK_RATE_HZ);
#if (OS_TASK_STAT_EN > 0U)
/* Determine CPU capacity */
OSStatInit();
#endif
/* Create application tasks */
App_TaskCreate();
/* Create application mailboxes */
App_MailboxCreate();
/* Initialize LCD */
SegmentLCD_Init(true);
/* Turn gecko symbol ON */
SegmentLCD_Symbol(LCD_SYMBOL_GECKO, 1);
/* Turn EFM32 symbol ON */
SegmentLCD_Symbol(LCD_SYMBOL_EFM32, 1);
/* Write welcome message on LCD */
SegmentLCD_Write("uC/OS-3");
/* As USART connectors are not available on the STK by default,
* therefore printf() functions are turned off.
* Uncomment the macro definition in includes.h if serial
* is connected to your STK board (USART1 or LEUART0)! */
#ifdef USART_CONNECTED
/* Initialize serial port */
RETARGET_SerialInit();
RETARGET_SerialCrLf(1);
osVersion3 = OSVersion( &err );
osVersion1 = osVersion3 / 10000;
osVersion3 -= osVersion1 * 10000;
osVersion2 = osVersion3 / 100;
osVersion3 -= osVersion2 * 100;
osVersion3 %= 100;
/* Write welcome message on serial */
printf("\n*****************************************************************************");
printf("\n uC/OS-III v%d.%02d.%02d on Energy Micro EFM32 STK ",
osVersion1, osVersion2, osVersion3 );
printf("\n Demo Application \n");
printf("\n uC/OS-III ");
printf("\n \"The real time kernel\" ");
printf("\n www.micrium.com ");
printf("\n\n is running on ");
printf("\n\n Energy Micro EFM32 ");
printf("\n \"The world's most energy friendly microcontrollers\" ");
printf("\n www.energymicro.com \n");
printf("\nDescription:");
printf("\nTask1: LED blink task");
printf("\nTask2: Receives characters from serial and posts message to Task3");
printf("\nTask3: Receives message from Task2 and writes it on LCD and serial.");
printf("\n*****************************************************************************\n");
printf("\nStart typing...\n");
#endif /* end of #ifndef USART_CONNECTED */
/* Suspend this task as it is only used once in one Reset cycle */
OSTaskSuspend(&AppTaskStartTCB, &err);
/* Error had occured if code execution reached this point as suspend calls the scheduler
* that performs a context switch */
while (1U) ;
}
