Team DIANA / mbed-src

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Dependents:   MX106-finaltest

Fork of mbed-src by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/mbed_overrides.c@608:14dd4108b341, 2015-08-14 (annotated)

Committer:
mbed_official
Date:
Fri Aug 14 08:45:08 2015 +0100
Revision:
608:14dd4108b341
Parent:
548:1abac31e188e
Child:
627:4fa1328d9c60
Synchronized with git revision 77a08517db34a83c9b5478adf089e5a641797b2a



Full URL: https://github.com/mbedmicro/mbed/commit/77a08517db34a83c9b5478adf089e5a641797b2a/



[Silicon Labs] Fix incorrect clock selection

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 525:c320967f86b9 1 /* mbed Microcontroller Library
mbed_official 525:c320967f86b9 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 525:c320967f86b9 3 *
mbed_official 525:c320967f86b9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 525:c320967f86b9 5 * you may not use this file except in compliance with the License.
mbed_official 525:c320967f86b9 6 * You may obtain a copy of the License at
mbed_official 525:c320967f86b9 7 *
mbed_official 525:c320967f86b9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 525:c320967f86b9 9 *
mbed_official 525:c320967f86b9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 525:c320967f86b9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 525:c320967f86b9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 525:c320967f86b9 13 * See the License for the specific language governing permissions and
mbed_official 525:c320967f86b9 14 * limitations under the License.
mbed_official 525:c320967f86b9 15 */
mbed_official 525:c320967f86b9 16 #include "em_chip.h"
mbed_official 525:c320967f86b9 17 #include "em_device.h"
mbed_official 525:c320967f86b9 18 #include "em_cmu.h"
mbed_official 525:c320967f86b9 19 #include "em_emu.h"
mbed_official 525:c320967f86b9 20 #include "device_peripherals.h"
mbed_official 525:c320967f86b9 21 #include "device.h"
mbed_official 525:c320967f86b9 22 #include "em_usart.h"
mbed_official 525:c320967f86b9 23 #include "gpio_api.h"
mbed_official 525:c320967f86b9 24
mbed_official 525:c320967f86b9 25 gpio_t bc_enable;
mbed_official 525:c320967f86b9 26
mbed_official 525:c320967f86b9 27 void check_usart_clock(USART_TypeDef* usart, uint32_t clockmask);
mbed_official 525:c320967f86b9 28
mbed_official 525:c320967f86b9 29 /* Called before main - implement here if board needs it.
mbed_official 525:c320967f86b9 30 * Otherwise, let the application override this if necessary */
mbed_official 525:c320967f86b9 31 void mbed_sdk_init()
mbed_official 525:c320967f86b9 32 {
mbed_official 525:c320967f86b9 33 CHIP_Init();
mbed_official 525:c320967f86b9 34
mbed_official 525:c320967f86b9 35 /* Set up the clock sources for this chip */
mbed_official 525:c320967f86b9 36 #if( CORE_CLOCK_SOURCE == HFXO)
mbed_official 608:14dd4108b341 37 CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFXO);
mbed_official 608:14dd4108b341 38 CMU_ClockSelectSet(cmuClock_HFPER, cmuSelect_HFXO);
mbed_official 525:c320967f86b9 39 SystemHFXOClockSet(HFXO_FREQUENCY);
mbed_official 525:c320967f86b9 40 #elif( CORE_CLOCK_SOURCE == HFRCO)
mbed_official 608:14dd4108b341 41 CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFRCO);
mbed_official 608:14dd4108b341 42 CMU_ClockSelectSet(cmuClock_HFPER, cmuSelect_HFRCO);
mbed_official 525:c320967f86b9 43 CMU_HFRCOBandSet(HFRCO_FREQUENCY);
mbed_official 525:c320967f86b9 44 #else
mbed_official 525:c320967f86b9 45 #error "Core clock selection not valid (mbed_overrides.c)"
mbed_official 525:c320967f86b9 46 #endif
mbed_official 525:c320967f86b9 47
mbed_official 525:c320967f86b9 48 CMU_ClockEnable(cmuClock_CORELE, true);
mbed_official 525:c320967f86b9 49
mbed_official 525:c320967f86b9 50 #if( LOW_ENERGY_CLOCK_SOURCE == LFXO )
mbed_official 525:c320967f86b9 51 #ifdef CMU_LFACLKSEL_REG
mbed_official 608:14dd4108b341 52 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);
mbed_official 525:c320967f86b9 53 #endif
mbed_official 525:c320967f86b9 54 #ifdef CMU_LFBCLKSEL_REG
mbed_official 548:1abac31e188e 55 /* cmuClock_LFB (to date) only has LEUART peripherals.
mbed_official 548:1abac31e188e 56 * Do NOT set it up here, as LEUARTs might have been initialized
mbed_official 548:1abac31e188e 57 * before this code is called. (Limitation of the override mechanism of ARMCC)
mbed_official 548:1abac31e188e 58 */
mbed_official 548:1abac31e188e 59 //TODO: Look for a more elegant fix.
mbed_official 527:74d34ce5a2b5 60 //CMU_ClockSelectSet(cmuClock_LFB, LFXO);
mbed_official 525:c320967f86b9 61 #endif
mbed_official 525:c320967f86b9 62 #ifdef CMU_LFECLKSEL_REG
mbed_official 608:14dd4108b341 63 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFXO);
mbed_official 525:c320967f86b9 64 #endif
mbed_official 525:c320967f86b9 65 SystemLFXOClockSet(LFXO_FREQUENCY);
mbed_official 525:c320967f86b9 66
mbed_official 525:c320967f86b9 67 #elif( LOW_ENERGY_CLOCK_SOURCE == LFRCO )
mbed_official 525:c320967f86b9 68 #ifdef CMU_LFACLKSEL_REG
mbed_official 608:14dd4108b341 69 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFRCO);
mbed_official 525:c320967f86b9 70 #endif
mbed_official 525:c320967f86b9 71 #ifdef CMU_LFBCLKSEL_REG
mbed_official 525:c320967f86b9 72 //CMU_ClockSelectSet(cmuClock_LFB, LFRCO);
mbed_official 525:c320967f86b9 73 #endif
mbed_official 525:c320967f86b9 74 #ifdef CMU_LFECLKSEL_REG
mbed_official 608:14dd4108b341 75 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFRCO);
mbed_official 525:c320967f86b9 76 #endif
mbed_official 525:c320967f86b9 77 CMU_HFRCOBandSet(HFRCO_FREQUENCY);
mbed_official 525:c320967f86b9 78
mbed_official 525:c320967f86b9 79 #elif( LOW_ENERGY_CLOCK_SOURCE == ULFRCO)
mbed_official 525:c320967f86b9 80 #ifdef CMU_LFACLKSEL_REG
mbed_official 608:14dd4108b341 81 CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_ULFRCO);
mbed_official 525:c320967f86b9 82 #endif
mbed_official 525:c320967f86b9 83 #ifdef CMU_LFBCLKSEL_REG
mbed_official 608:14dd4108b341 84 CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_ULFRCO);
mbed_official 525:c320967f86b9 85 #endif
mbed_official 525:c320967f86b9 86 #ifdef CMU_LFECLKSEL_REG
mbed_official 608:14dd4108b341 87 CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_ULFRCO);
mbed_official 525:c320967f86b9 88 #endif
mbed_official 525:c320967f86b9 89 #else
mbed_official 525:c320967f86b9 90 #error "Low energy clock selection not valid"
mbed_official 525:c320967f86b9 91 #endif
mbed_official 525:c320967f86b9 92
mbed_official 525:c320967f86b9 93 /* Enable BC line driver to avoid garbage on CDC port */
mbed_official 525:c320967f86b9 94 gpio_init_out_ex(&bc_enable, EFM_BC_EN, 1);
mbed_official 525:c320967f86b9 95 }
mbed_official 525:c320967f86b9 96
mbed_official 548:1abac31e188e 97 void check_usart_clock(USART_TypeDef* usart, uint32_t clockmask)
mbed_official 548:1abac31e188e 98 {
mbed_official 525:c320967f86b9 99 uint32_t freq = 14000000, baudrate;
mbed_official 525:c320967f86b9 100 USART_OVS_TypeDef ovs;
mbed_official 525:c320967f86b9 101
mbed_official 525:c320967f86b9 102 if(CMU->HFPERCLKEN0 & clockmask) {
mbed_official 525:c320967f86b9 103 /* Different methods for sync vs async */
mbed_official 525:c320967f86b9 104 if(usart->CTRL & USART_CTRL_SYNC) {
mbed_official 525:c320967f86b9 105 ovs = (USART_OVS_TypeDef) (usart->CTRL & _USART_CTRL_OVS_MASK);
mbed_official 525:c320967f86b9 106 baudrate = USART_BaudrateCalc(freq, usart->CLKDIV, true, ovs);
mbed_official 525:c320967f86b9 107 USART_BaudrateSyncSet(usart, 0, baudrate);
mbed_official 525:c320967f86b9 108 } else {
mbed_official 525:c320967f86b9 109 ovs = (USART_OVS_TypeDef) (usart->CTRL & _USART_CTRL_OVS_MASK);
mbed_official 525:c320967f86b9 110 baudrate = USART_BaudrateCalc(freq, usart->CLKDIV, false, ovs);
mbed_official 525:c320967f86b9 111 USART_BaudrateAsyncSet(usart, 0, baudrate, ovs);
mbed_official 525:c320967f86b9 112 }
mbed_official 525:c320967f86b9 113 }
mbed_official 525:c320967f86b9 114 }