158 lines
5.2 KiB
C
158 lines
5.2 KiB
C
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/***************************************************************************//**
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* @file
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* @brief Chip initialization, SW workarounds for chip errata issues
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* @author Energy Micro AS
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* @version 1.3.0
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2010 Energy Micro AS, http://www.energymicro.com</b>
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*******************************************************************************
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*
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* This source code is the property of Energy Micro AS. The source and compiled
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* code may only be used on Energy Micro "EFM32" microcontrollers.
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*
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* This copyright notice may not be removed from the source code nor changed.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#ifndef __EFM32_CHIP_H
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#define __EFM32_CHIP_H
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#include "efm32.h"
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#include "efm32_system.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***************************************************************************//**
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* @addtogroup EFM32_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup CHIP
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* @{
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******************************************************************************/
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/**************************************************************************//**
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* @brief
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* Chip initialization routine for revision errata workarounds
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*
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* This init function will configure the EFM32 device to a state where it is
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* as similar as later revisions as possible, to improve software compatibility
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* with newer parts. See the device specific errata for details.
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*****************************************************************************/
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static __INLINE void CHIP_Init(void)
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{
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uint32_t rev;
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SYSTEM_ChipRevision_TypeDef chipRev;
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volatile uint32_t *reg;
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rev = *(volatile uint32_t *)(0x0FE081FC);
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/* Engineering Sample calibration setup */
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if ((rev >> 24) == 0)
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{
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reg = (volatile uint32_t *) 0x400CA00C;
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*reg &= ~(0x70UL);
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/* DREG */
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reg = (volatile uint32_t *) 0x400C6020;
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*reg &= ~(0xE0000000UL);
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*reg |= ~(7UL << 25);
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}
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if ((rev >> 24) <= 3)
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{
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/* DREG */
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reg = (volatile uint32_t *) 0x400C6020;
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*reg &= ~(0x00001F80UL);
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/* Update CMU reset values */
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reg = (volatile uint32_t *) 0x400C8040;
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*reg = 0;
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reg = (volatile uint32_t *) 0x400C8044;
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*reg = 0;
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reg = (volatile uint32_t *) 0x400C8058;
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*reg = 0;
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reg = (volatile uint32_t *) 0x400C8060;
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*reg = 0;
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reg = (volatile uint32_t *) 0x400C8078;
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*reg = 0;
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}
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SYSTEM_ChipRevisionGet(&chipRev);
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if (chipRev.major == 0x01)
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{
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/* Rev A errata handling for EM2/3. Must enable DMA clock in order for EM2/3 */
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/* to work. This will be fixed in later chip revisions, so only do for rev A. */
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if (chipRev.minor == 00)
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{
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reg = (volatile uint32_t *) 0x400C8040;
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*reg |= 0x2;
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}
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/* Rev A+B errata handling for I2C when using EM2/3. USART0 clock must be enabled */
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/* after waking up from EM2/EM3 in order for I2C to work. This will be fixed in */
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/* later chip revisions, so only do for rev A+B. */
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if (chipRev.minor <= 0x01)
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{
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reg = (volatile uint32_t *) 0x400C8044;
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*reg |= 0x1;
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}
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}
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/* Ensure correct ADC/DAC calibration value */
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rev = *(volatile uint32_t *) 0x0FE081F0;
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if ( rev < 0x4C8ABA00 )
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{
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uint32_t cal;
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/* Enable ADC/DAC clocks */
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reg = (volatile uint32_t *) 0x400C8044UL;
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*reg |= (1<<14|1<<11);
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/* Retrive calibration values */
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cal = ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x00007F00UL) >>
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8) << 24;
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cal |= ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x0000007FUL) >>
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0) << 16;
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cal |= ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x00007F00UL) >>
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8) << 8;
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cal |= ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x0000007FUL) >>
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0) << 0;
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/* ADC0->CAL = 1.25 reference */
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reg = (volatile uint32_t *) 0x40002034UL;
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*reg = cal;
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/* DAC0->CAL = 1.25 reference */
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reg = (volatile uint32_t *) (0x4000402CUL);
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cal = *(volatile uint32_t *) 0x0FE081C8UL;
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*reg = cal;
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/* Turn off ADC/DAC clocks */
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reg = (volatile uint32_t *) 0x400C8044UL;
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*reg &= ~(1<<14|1<<11);
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}
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}
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/** @} (end addtogroup SYSTEM) */
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/** @} (end addtogroup EFM32_Library) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __EFM32_CHIP_H */
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