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- /***************************************************************************//**
- * @file
- * @brief Chip initialization, SW workarounds for chip errata issues
- * @author Energy Micro AS
- * @version 1.3.0
- *******************************************************************************
- * @section License
- * <b>(C) Copyright 2010 Energy Micro AS, http://www.energymicro.com</b>
- *******************************************************************************
- *
- * This source code is the property of Energy Micro AS. The source and compiled
- * code may only be used on Energy Micro "EFM32" microcontrollers.
- *
- * This copyright notice may not be removed from the source code nor changed.
- *
- * 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 __EFM32_CHIP_H
- #define __EFM32_CHIP_H
- #include "efm32.h"
- #include "efm32_system.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- /***************************************************************************//**
- * @addtogroup EFM32_Library
- * @{
- ******************************************************************************/
- /***************************************************************************//**
- * @addtogroup CHIP
- * @{
- ******************************************************************************/
- /**************************************************************************//**
- * @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)
- {
- 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);
- }
- }
- /** @} (end addtogroup SYSTEM) */
- /** @} (end addtogroup EFM32_Library) */
- #ifdef __cplusplus
- }
- #endif
- #endif /* __EFM32_CHIP_H */
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