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/***************************************************************************//**
* @file
* @brief Chip Initialization API
* @author Energy Micro AS
* @version 3.0.0
*******************************************************************************
* @section License
* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.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: Energy Micro AS has no
* obligation to support this Software. Energy Micro AS 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.
*
* Energy Micro AS 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.
*
******************************************************************************/
#ifndef __EM_CHIP_H
#define __EM_CHIP_H
#include "em_part.h"
#include "em_system.h"
#ifdef __cplusplus
extern "C" {
#endif
/***************************************************************************//**
* @addtogroup EM_Library
* @{
******************************************************************************/
/***************************************************************************//**
* @addtogroup CHIP
* @brief Chip Initialization API
* @{
******************************************************************************/
/**************************************************************************//**
* @brief
* Chip initialization routine for revision errata workarounds
*
* This init function will configure the EFM32 device to a state where it is
* as similar as later revisions as possible, to improve software compatibility
* with newer parts. See the device specific errata for details.
*****************************************************************************/
__STATIC_INLINE void CHIP_Init(void)
{
/* Currently only run time changes for Gecko devices */
#if defined(_EFM32_GECKO_FAMILY)
uint32_t rev;
SYSTEM_ChipRevision_TypeDef chipRev;
volatile uint32_t *reg;
rev = *(volatile uint32_t *)(0x0FE081FC);
/* Engineering Sample calibration setup */
if ((rev >> 24) == 0)
{
reg = (volatile uint32_t *)0x400CA00C;
*reg &= ~(0x70UL);
/* DREG */
reg = (volatile uint32_t *)0x400C6020;
*reg &= ~(0xE0000000UL);
*reg |= ~(7UL << 25);
}
if ((rev >> 24) <= 3)
{
/* DREG */
reg = (volatile uint32_t *)0x400C6020;
*reg &= ~(0x00001F80UL);
/* Update CMU reset values */
reg = (volatile uint32_t *)0x400C8040;
*reg = 0;
reg = (volatile uint32_t *)0x400C8044;
*reg = 0;
reg = (volatile uint32_t *)0x400C8058;
*reg = 0;
reg = (volatile uint32_t *)0x400C8060;
*reg = 0;
reg = (volatile uint32_t *)0x400C8078;
*reg = 0;
}
SYSTEM_ChipRevisionGet(&chipRev);
if (chipRev.major == 0x01)
{
/* Rev A errata handling for EM2/3. Must enable DMA clock in order for EM2/3 */
/* to work. This will be fixed in later chip revisions, so only do for rev A. */
if (chipRev.minor == 00)
{
reg = (volatile uint32_t *)0x400C8040;
*reg |= 0x2;
}
/* Rev A+B errata handling for I2C when using EM2/3. USART0 clock must be enabled */
/* after waking up from EM2/EM3 in order for I2C to work. This will be fixed in */
/* later chip revisions, so only do for rev A+B. */
if (chipRev.minor <= 0x01)
{
reg = (volatile uint32_t *)0x400C8044;
*reg |= 0x1;
}
}
/* Ensure correct ADC/DAC calibration value */
rev = *(volatile uint32_t *)0x0FE081F0;
if (rev < 0x4C8ABA00)
{
uint32_t cal;
/* Enable ADC/DAC clocks */
reg = (volatile uint32_t *)0x400C8044UL;
*reg |= (1 << 14 | 1 << 11);
/* Retrive calibration values */
cal = ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x00007F00UL) >>
8) << 24;
cal |= ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x0000007FUL) >>
0) << 16;
cal |= ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x00007F00UL) >>
8) << 8;
cal |= ((*(volatile uint32_t *)(0x0FE081B4UL) & 0x0000007FUL) >>
0) << 0;
/* ADC0->CAL = 1.25 reference */
reg = (volatile uint32_t *)0x40002034UL;
*reg = cal;
/* DAC0->CAL = 1.25 reference */
reg = (volatile uint32_t *)(0x4000402CUL);
cal = *(volatile uint32_t *)0x0FE081C8UL;
*reg = cal;
/* Turn off ADC/DAC clocks */
reg = (volatile uint32_t *)0x400C8044UL;
*reg &= ~(1 << 14 | 1 << 11);
}
#endif
}
/** @} (end addtogroup CHIP) */
/** @} (end addtogroup EM_Library) */
#ifdef __cplusplus
}
#endif
#endif /* __EM_CHIP_H */
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