added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_vcmp.c
- Revision:
- 0:9b334a45a8ff
- Child:
- 50:a417edff4437
diff -r 000000000000 -r 9b334a45a8ff targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_vcmp.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_vcmp.c Thu Oct 01 15:25:22 2015 +0300 @@ -0,0 +1,185 @@ +/***************************************************************************//** + * @file em_vcmp.c + * @brief Voltage Comparator (VCMP) peripheral API + * @version 3.20.12 + ******************************************************************************* + * @section License + * <b>(C) Copyright 2014 Silicon Labs, http://www.silabs.com</b> + ******************************************************************************* + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + * + * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no + * obligation to support this Software. Silicon Labs is providing the + * Software "AS IS", with no express or implied warranties of any kind, + * including, but not limited to, any implied warranties of merchantability + * or fitness for any particular purpose or warranties against infringement + * of any proprietary rights of a third party. + * + * Silicon Labs will not be liable for any consequential, incidental, or + * special damages, or any other relief, or for any claim by any third party, + * arising from your use of this Software. + * + ******************************************************************************/ + + +#include "em_vcmp.h" +#if defined(VCMP_COUNT) && (VCMP_COUNT > 0) + +#include "em_assert.h" + +/***************************************************************************//** + * @addtogroup EM_Library + * @{ + ******************************************************************************/ + +/***************************************************************************//** + * @addtogroup VCMP + * @brief Voltage Comparator (VCMP) Peripheral API + * @{ + ******************************************************************************/ + +/***************************************************************************//** + * @brief + * Configure and enable Voltage Comparator + * + * @param[in] vcmpInit + * VCMP Initialization structure + ******************************************************************************/ +void VCMP_Init(const VCMP_Init_TypeDef *vcmpInit) +{ + /* Verify input */ + EFM_ASSERT((vcmpInit->inactive == 0) || (vcmpInit->inactive == 1)); + EFM_ASSERT((vcmpInit->biasProg >= 0) && (vcmpInit->biasProg < 16)); + + /* Configure Half Bias setting */ + if (vcmpInit->halfBias) + { + VCMP->CTRL |= VCMP_CTRL_HALFBIAS; + } + else + { + VCMP->CTRL &= ~(VCMP_CTRL_HALFBIAS); + } + + /* Configure bias prog */ + VCMP->CTRL &= ~(_VCMP_CTRL_BIASPROG_MASK); + VCMP->CTRL |= (vcmpInit->biasProg << _VCMP_CTRL_BIASPROG_SHIFT); + + /* Configure sense for falling edge */ + if (vcmpInit->irqFalling) + { + VCMP->CTRL |= VCMP_CTRL_IFALL; + } + else + { + VCMP->CTRL &= ~(VCMP_CTRL_IFALL); + } + + /* Configure sense for rising edge */ + if (vcmpInit->irqRising) + { + VCMP->CTRL |= VCMP_CTRL_IRISE; + } + else + { + VCMP->CTRL &= ~(VCMP_CTRL_IRISE); + } + + /* Configure warm-up time */ + VCMP->CTRL &= ~(_VCMP_CTRL_WARMTIME_MASK); + VCMP->CTRL |= (vcmpInit->warmup << _VCMP_CTRL_WARMTIME_SHIFT); + + /* Configure hysteresis */ + switch (vcmpInit->hyst) + { + case vcmpHyst20mV: + VCMP->CTRL |= VCMP_CTRL_HYSTEN; + break; + case vcmpHystNone: + VCMP->CTRL &= ~(VCMP_CTRL_HYSTEN); + break; + default: + break; + } + + /* Configure inactive output value */ + VCMP->CTRL |= (vcmpInit->inactive << _VCMP_CTRL_INACTVAL_SHIFT); + + /* Configure trigger level */ + VCMP_TriggerSet(vcmpInit->triggerLevel); + + /* Enable or disable VCMP */ + if (vcmpInit->enable) + { + VCMP->CTRL |= VCMP_CTRL_EN; + } + else + { + VCMP->CTRL &= ~(VCMP_CTRL_EN); + } + + /* If Low Power Reference is enabled, wait until VCMP is ready */ + /* before enabling it, see reference manual for deatils */ + /* Configuring Low Power Ref without enable has no effect */ + if(vcmpInit->lowPowerRef && vcmpInit->enable) + { + /* Poll for VCMP ready */ + while(!VCMP_Ready()); + VCMP_LowPowerRefSet(vcmpInit->lowPowerRef); + } + + /* Clear edge interrupt */ + VCMP_IntClear(VCMP_IF_EDGE); +} + + +/***************************************************************************//** + * @brief + * Enable or disable Low Power Reference setting + * + * @param[in] enable + * If true, enables low power reference, if false disable low power reference + ******************************************************************************/ +void VCMP_LowPowerRefSet(bool enable) +{ + if (enable) + { + VCMP->INPUTSEL |= VCMP_INPUTSEL_LPREF; + } + else + { + VCMP->INPUTSEL &= ~(VCMP_INPUTSEL_LPREF); + } +} + + +/***************************************************************************//** + * @brief + * Configure trigger level of voltage comparator + * + * @param[in] level + * Trigger value, in range 0-63 + ******************************************************************************/ +void VCMP_TriggerSet(int level) +{ + /* Trigger range is 6 bits, value from 0-63 */ + EFM_ASSERT((level > 0) && (level < 64)); + + /* Set trigger level */ + VCMP->INPUTSEL = (VCMP->INPUTSEL & ~(_VCMP_INPUTSEL_TRIGLEVEL_MASK)) | + (level << _VCMP_INPUTSEL_TRIGLEVEL_SHIFT); +} + + +/** @} (end addtogroup VCMP) */ +/** @} (end addtogroup EM_Library) */ +#endif /* defined(VCMP_COUNT) && (VCMP_COUNT > 0) */