*** EFM32 branch ***

1. Update the copyright information
 - 2009 => 2011
2. Add external oscillator configuration routine in "rt_hw_board_init()"
 - Before, it is set by default frequency, 32MHz
 - Now it can be set by user specified frequency
3. Add ADC and ACMP (analog comparator) drivers
4. Clarify the MCU and target board define in "rtconfig.py"

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1296 bbd45198-f89e-11dd-88c7-29a3b14d5316

1 files changed, 190 insertions, 0 deletions

diff --git a/bsp/efm32/dev_misc.c b/bsp/efm32/dev_misc.c
new file mode 100644
index 0000000000..2f7ccf50a9
--- /dev/null
+++ b/bsp/efm32/dev_misc.c
@@ -0,0 +1,190 @@
+/******************************************************************//**

+ * @file 		dev_misc.c

+ * @brief 	Miscellaneous drivers of RT-Thread RTOS for EFM32

+ * 	COPYRIGHT (C) 2011, RT-Thread Development Team

+ * @author 	onelife

+ * @version 	0.4 beta

+ **********************************************************************

+ * @section License

+ * The license and distribution terms for this file may be found in the file LICENSE in this 

+ * distribution or at http://www.rt-thread.org/license/LICENSE

+ **********************************************************************

+ * @section Change Logs

+ * Date			Author		Notes

+ * 2011-02-22	onelife		Initial creation for EFM32

+ *********************************************************************/

+

+/******************************************************************//**

+ * @addtogroup efm32

+ * @{

+*********************************************************************/

+

+/* Includes -------------------------------------------------------------------*/

+#include "board.h"

+#include "drv_adc.h"

+

+/* Private typedef -------------------------------------------------------------*/

+/* Private define --------------------------------------------------------------*/

+/* Private macro --------------------------------------------------------------*/

+/* Private constants -----------------------------------------------------------*/

+static rt_device_t adc0;

+static struct efm32_adc_control_t control = {ADC_MODE_SINGLE};

+

+/* Private variables ------------------------------------------------------------*/

+/* Private function prototypes ---------------------------------------------------*/

+rt_int32_t efm32_misc_getCelsius(rt_uint32_t adcSample);

+

+/* Private functions ------------------------------------------------------------*/

+/******************************************************************//**

+ * @brief

+ *   Get current temperature value in degree celsius

+ *

+ * @details

+ *

+ * @note

+ *

+ * @return

+ *   Temperature value (signed integer) in degree celsius times 100

+ *

+ *********************************************************************/

+rt_int32_t rt_hw_get_temp(void)

+{

+	ADC_InitSingle_TypeDef 	singleInit = ADC_INITSINGLE_DEFAULT;

+	rt_uint32_t 			temp;

+

+	/* Set input to temperature sensor. Acquisition time must be 256 cycles. Reference must 

+	    be 1.25V */

+	singleInit.acqTime 		= adcAcqTime32;

+	singleInit.reference 	= adcRef1V25;

+	singleInit.input 		= adcSingleInpTemp;

+

+	control.singleInit 		= &singleInit;

+	adc0->control(adc0, RT_DEVICE_CTRL_ADC_MODE, &control);

+	adc0->control(adc0, RT_DEVICE_CTRL_RESUME, EFM32_NO_POINTER);

+	adc0->control(adc0, RT_DEVICE_CTRL_ADC_RESULT, &temp);

+

+	return efm32_misc_getCelsius(temp);

+}

+

+/******************************************************************//**

+ * @brief

+ *   Get current VDD value in volt

+ *

+ * @details

+ *

+ * @note

+ *

+ * @return

+ *   VDD value (unsigned integer) in volt times 100

+ *

+ *********************************************************************/

+rt_uint32_t rt_hw_get_vdd(void)

+{

+	ADC_InitSingle_TypeDef 	singleInit = ADC_INITSINGLE_DEFAULT;

+	rt_uint32_t 			vdd;

+

+	/* Set input to temperature sensor. Reference must be 1.25V */

+	singleInit.acqTime 		= adcAcqTime32;

+	singleInit.reference 	= adcRef1V25;

+	singleInit.input 		= adcSingleInpVDDDiv3;

+

+	control.singleInit 		= &singleInit;

+	adc0->control(adc0, RT_DEVICE_CTRL_ADC_MODE, &control);

+	adc0->control(adc0, RT_DEVICE_CTRL_RESUME, EFM32_NO_POINTER);

+	adc0->control(adc0, RT_DEVICE_CTRL_ADC_RESULT, &vdd);

+

+	return (vdd * 125 * 3) / 4096;

+}

+

+/******************************************************************//**

+ * @brief

+ *   Initialize all the miscellaneous drivers

+ *

+ * @details

+ *

+ * @note

+ *

+ * @return

+ *	 Error code

+ *********************************************************************/

+rt_err_t rt_hw_misc_init(void)

+{

+	adc0 = rt_device_find(RT_ADC0_NAME);

+	if (adc0 == RT_NULL)

+	{

+		rt_kprintf("Batt error: Can't find device: %s!\n", RT_ADC0_NAME);

+		

+		goto MISC_INIT_ERROR;

+	}

+

+	return RT_EOK;

+

+

+MISC_INIT_ERROR:

+#ifdef RT_MISC_DEBUG

+	rt_kprintf("Misc error: Init failed!\n");

+#endif

+

+	return -RT_ERROR;

+

+}

+

+/**************************************************************************//**

+ * @brief 

+ *   Convert ADC result to degree celsius.

+ *

+ * @details

+ *

+ * @note 

+ *   See section 2.3.4 in the reference manual for details on this calculatoin

+ *

+ * @param adcResult 

+ *   Raw value from ADC to be converted to celsius

+ *

+ * @return 

+ *   The temperature value (signed integer) in degrees celsius times 100

+ *

+ *****************************************************************************/

+rt_int32_t efm32_misc_getCelsius(rt_uint32_t adcResult)

+{

+	/* Factory calibration temperature from device information page. */

+	rt_int32_t cal_temp 	= ((DEVINFO->CAL & _DEVINFO_CAL_TEMP_MASK) \

+								>> _DEVINFO_CAL_TEMP_SHIFT) * 100;

+

+	/* Factory calibration value from device information page. */

+	rt_int32_t cal_value	= ((DEVINFO->ADC0CAL2 & _DEVINFO_ADC0CAL2_TEMP1V25_MASK) \

+								>> _DEVINFO_ADC0CAL2_TEMP1V25_SHIFT) * 10000;

+

+	/* Temperature gradient (from datasheet) in (ADC unit / degree celsius * 100) */

+	rt_int32_t t_grad 		= -385;

+

+	return (cal_temp - (cal_value - (rt_int32_t)adcResult * 10000) / t_grad);

+}

+

+/*********************************************************************

+* 	Export to FINSH

+*********************************************************************/

+#ifdef RT_USING_FINSH

+#include <finsh.h>

+

+void list_temp(void)

+{

+	rt_int32_t temp = rt_hw_get_temp();

+

+	rt_kprintf("Temperature is %2d.%02d C\n", temp / 100, temp % 100);

+}

+FINSH_FUNCTION_EXPORT(list_temp, list current temperature value.)

+

+void list_vdd(void)

+{

+	rt_uint32_t vdd = rt_hw_get_vdd();

+	

+	rt_kprintf("VDD is %1d.%02d V\n", vdd / 100, vdd % 100);

+}

+FINSH_FUNCTION_EXPORT(list_vdd, list current VDD value.)

+

+#endif

+

+/******************************************************************//**

+ * @}

+*********************************************************************/