mbed official / mbed-src

mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/mbed_overrides.c@627:4fa1328d9c60, 2015-09-25 (annotated)

Committer:
mbed_official
Date:
Fri Sep 25 14:15:10 2015 +0100
Revision:
627:4fa1328d9c60
Parent:
608:14dd4108b341 
Synchronized with git revision fe238a91ab7a4d1d72c4cab9da04967c619d54ad



Full URL: https://github.com/mbedmicro/mbed/commit/fe238a91ab7a4d1d72c4cab9da04967c619d54ad/



Silicon Labs - Add support for low-power async Serial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 627:4fa1328d9c60 1 /***************************************************************************//**
mbed_official 627:4fa1328d9c60 2 * @file mbed_overrides.c
mbed_official 627:4fa1328d9c60 3 *******************************************************************************
mbed_official 627:4fa1328d9c60 4 * @section License
mbed_official 627:4fa1328d9c60 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
mbed_official 627:4fa1328d9c60 6 *******************************************************************************
mbed_official 525:c320967f86b9 7 *
mbed_official 627:4fa1328d9c60 8 * Permission is granted to anyone to use this software for any purpose,
mbed_official 627:4fa1328d9c60 9 * including commercial applications, and to alter it and redistribute it
mbed_official 627:4fa1328d9c60 10 * freely, subject to the following restrictions:
mbed_official 525:c320967f86b9 11 *
mbed_official 627:4fa1328d9c60 12 * 1. The origin of this software must not be misrepresented; you must not
mbed_official 627:4fa1328d9c60 13 * claim that you wrote the original software.
mbed_official 627:4fa1328d9c60 14 * 2. Altered source versions must be plainly marked as such, and must not be
mbed_official 627:4fa1328d9c60 15 * misrepresented as being the original software.
mbed_official 627:4fa1328d9c60 16 * 3. This notice may not be removed or altered from any source distribution.
mbed_official 525:c320967f86b9 17 *
mbed_official 627:4fa1328d9c60 18 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
mbed_official 627:4fa1328d9c60 19 * obligation to support this Software. Silicon Labs is providing the
mbed_official 627:4fa1328d9c60 20 * Software "AS IS", with no express or implied warranties of any kind,
mbed_official 627:4fa1328d9c60 21 * including, but not limited to, any implied warranties of merchantability
mbed_official 627:4fa1328d9c60 22 * or fitness for any particular purpose or warranties against infringement
mbed_official 627:4fa1328d9c60 23 * of any proprietary rights of a third party.
mbed_official 627:4fa1328d9c60 24 *
mbed_official 627:4fa1328d9c60 25 * Silicon Labs will not be liable for any consequential, incidental, or
mbed_official 627:4fa1328d9c60 26 * special damages, or any other relief, or for any claim by any third party,
mbed_official 627:4fa1328d9c60 27 * arising from your use of this Software.
mbed_official 627:4fa1328d9c60 28 *
mbed_official 627:4fa1328d9c60 29 ******************************************************************************/
mbed_official 627:4fa1328d9c60 30
mbed_official 525:c320967f86b9 31 #include "em_chip.h"
mbed_official 525:c320967f86b9 32 #include "em_device.h"
mbed_official 525:c320967f86b9 33 #include "em_cmu.h"
mbed_official 525:c320967f86b9 34 #include "em_emu.h"
mbed_official 525:c320967f86b9 35 #include "device_peripherals.h"
mbed_official 525:c320967f86b9 36 #include "device.h"
mbed_official 525:c320967f86b9 37 #include "em_usart.h"
mbed_official 525:c320967f86b9 38 #include "gpio_api.h"
mbed_official 525:c320967f86b9 39
mbed_official 525:c320967f86b9 40 gpio_t bc_enable;
mbed_official 525:c320967f86b9 41
mbed_official 525:c320967f86b9 42 void check_usart_clock(USART_TypeDef* usart, uint32_t clockmask);
mbed_official 525:c320967f86b9 43
mbed_official 525:c320967f86b9 44 /* Called before main - implement here if board needs it.
mbed_official 525:c320967f86b9 45 * Otherwise, let the application override this if necessary */
mbed_official 525:c320967f86b9 46 void mbed_sdk_init()
mbed_official 525:c320967f86b9 47 {
mbed_official 525:c320967f86b9 48 CHIP_Init();
mbed_official 525:c320967f86b9 49
mbed_official 525:c320967f86b9 50 /* Set up the clock sources for this chip */
mbed_official 525:c320967f86b9 51 #if( CORE_CLOCK_SOURCE == HFXO)
mbed_official 608:14dd4108b341 52 CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFXO);
mbed_official 525:c320967f86b9 53 SystemHFXOClockSet(HFXO_FREQUENCY);
mbed_official 525:c320967f86b9 54 #elif( CORE_CLOCK_SOURCE == HFRCO)
mbed_official 608:14dd4108b341 55 CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFRCO);
mbed_official 525:c320967f86b9 56 CMU_HFRCOBandSet(HFRCO_FREQUENCY);
mbed_official 525:c320967f86b9 57 #else
mbed_official 525:c320967f86b9 58 #error "Core clock selection not valid (mbed_overrides.c)"
mbed_official 525:c320967f86b9 59 #endif
mbed_official 525:c320967f86b9 60
mbed_official 525:c320967f86b9 61 CMU_ClockEnable(cmuClock_CORELE, true);
mbed_official 525:c320967f86b9 62
mbed_official 525:c320967f86b9 63 #if( LOW_ENERGY_CLOCK_SOURCE == LFXO )
mbed_official 525:c320967f86b9 64 #ifdef CMU_LFACLKSEL_REG
mbed_official 608:14dd4108b341 65 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);
mbed_official 525:c320967f86b9 66 #endif
mbed_official 525:c320967f86b9 67 #ifdef CMU_LFBCLKSEL_REG
mbed_official 548:1abac31e188e 68 /* cmuClock_LFB (to date) only has LEUART peripherals.
mbed_official 627:4fa1328d9c60 69 * This gets set automatically whenever you create serial objects using LEUART
mbed_official 548:1abac31e188e 70 */
mbed_official 525:c320967f86b9 71 #endif
mbed_official 525:c320967f86b9 72 #ifdef CMU_LFECLKSEL_REG
mbed_official 608:14dd4108b341 73 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFXO);
mbed_official 525:c320967f86b9 74 #endif
mbed_official 525:c320967f86b9 75 SystemLFXOClockSet(LFXO_FREQUENCY);
mbed_official 525:c320967f86b9 76
mbed_official 525:c320967f86b9 77 #elif( LOW_ENERGY_CLOCK_SOURCE == LFRCO )
mbed_official 525:c320967f86b9 78 #ifdef CMU_LFACLKSEL_REG
mbed_official 608:14dd4108b341 79 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFRCO);
mbed_official 525:c320967f86b9 80 #endif
mbed_official 525:c320967f86b9 81 #ifdef CMU_LFBCLKSEL_REG
mbed_official 627:4fa1328d9c60 82 //CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFRCO);
mbed_official 525:c320967f86b9 83 #endif
mbed_official 525:c320967f86b9 84 #ifdef CMU_LFECLKSEL_REG
mbed_official 608:14dd4108b341 85 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFRCO);
mbed_official 525:c320967f86b9 86 #endif
mbed_official 525:c320967f86b9 87 CMU_HFRCOBandSet(HFRCO_FREQUENCY);
mbed_official 525:c320967f86b9 88
mbed_official 525:c320967f86b9 89 #elif( LOW_ENERGY_CLOCK_SOURCE == ULFRCO)
mbed_official 525:c320967f86b9 90 #ifdef CMU_LFACLKSEL_REG
mbed_official 608:14dd4108b341 91 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_ULFRCO);
mbed_official 525:c320967f86b9 92 #endif
mbed_official 525:c320967f86b9 93 #ifdef CMU_LFBCLKSEL_REG
mbed_official 608:14dd4108b341 94 CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_ULFRCO);
mbed_official 525:c320967f86b9 95 #endif
mbed_official 525:c320967f86b9 96 #ifdef CMU_LFECLKSEL_REG
mbed_official 608:14dd4108b341 97 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_ULFRCO);
mbed_official 525:c320967f86b9 98 #endif
mbed_official 525:c320967f86b9 99 #else
mbed_official 525:c320967f86b9 100 #error "Low energy clock selection not valid"
mbed_official 525:c320967f86b9 101 #endif
mbed_official 525:c320967f86b9 102
mbed_official 525:c320967f86b9 103 /* Enable BC line driver to avoid garbage on CDC port */
mbed_official 525:c320967f86b9 104 gpio_init_out_ex(&bc_enable, EFM_BC_EN, 1);
mbed_official 525:c320967f86b9 105 }
mbed_official 525:c320967f86b9 106
mbed_official 548:1abac31e188e 107 void check_usart_clock(USART_TypeDef* usart, uint32_t clockmask)
mbed_official 548:1abac31e188e 108 {
mbed_official 525:c320967f86b9 109 uint32_t freq = 14000000, baudrate;
mbed_official 525:c320967f86b9 110 USART_OVS_TypeDef ovs;
mbed_official 525:c320967f86b9 111
mbed_official 525:c320967f86b9 112 if(CMU->HFPERCLKEN0 & clockmask) {
mbed_official 525:c320967f86b9 113 /* Different methods for sync vs async */
mbed_official 525:c320967f86b9 114 if(usart->CTRL & USART_CTRL_SYNC) {
mbed_official 525:c320967f86b9 115 ovs = (USART_OVS_TypeDef) (usart->CTRL & _USART_CTRL_OVS_MASK);
mbed_official 525:c320967f86b9 116 baudrate = USART_BaudrateCalc(freq, usart->CLKDIV, true, ovs);
mbed_official 525:c320967f86b9 117 USART_BaudrateSyncSet(usart, 0, baudrate);
mbed_official 525:c320967f86b9 118 } else {
mbed_official 525:c320967f86b9 119 ovs = (USART_OVS_TypeDef) (usart->CTRL & _USART_CTRL_OVS_MASK);
mbed_official 525:c320967f86b9 120 baudrate = USART_BaudrateCalc(freq, usart->CLKDIV, false, ovs);
mbed_official 525:c320967f86b9 121 USART_BaudrateAsyncSet(usart, 0, baudrate, ovs);
mbed_official 525:c320967f86b9 122 }
mbed_official 525:c320967f86b9 123 }
mbed_official 525:c320967f86b9 124 }