added prescaler for 16 bit pwm in LPC1347 target
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Diff: targets/hal/TARGET_NUVOTON/TARGET_NUC472/TARGET_NUMAKER_PFM_NUC472/mbed_overrides.c
- Revision:
- 144:ef7eb2e8f9f7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_NUVOTON/TARGET_NUC472/TARGET_NUMAKER_PFM_NUC472/mbed_overrides.c Fri Sep 02 15:07:44 2016 +0100 @@ -0,0 +1,93 @@ +/* mbed Microcontroller Library + * Copyright (c) 2015-2016 Nuvoton + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "cmsis.h" +#include "analogin_api.h" + +// NOTE: Ensurce mbed_sdk_init() will get called before C++ global object constructor. +#if defined(__CC_ARM) || defined(__GNUC__) +void mbed_sdk_init_forced(void) __attribute__((constructor(101))); +#elif defined(__ICCARM__) + // FIXME: How to achieve it in IAR? +#endif + +void mbed_sdk_init(void) +{ + // NOTE: Support singleton semantics to be called from other init functions + static int inited = 0; + if (inited) { + return; + } + inited = 1; + + /*---------------------------------------------------------------------------------------------------------*/ + /* Init System Clock */ + /*---------------------------------------------------------------------------------------------------------*/ + /* Unlock protected registers */ + SYS_UnlockReg(); + + /* Enable External XTAL (4~24 MHz) */ + CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk); + /* Enable LIRC for lp_ticker */ + CLK_EnableXtalRC(CLK_PWRCTL_LIRCEN_Msk); + /* Enable LXT for RTC */ + CLK_EnableXtalRC(CLK_PWRCTL_LXTEN_Msk); + + /* Waiting for External XTAL (4~24 MHz) ready */ + CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk); + /* Waiting for LIRC ready */ + CLK_WaitClockReady(CLK_STATUS_LIRCSTB_Msk); + /* Waiting for LXT ready */ + CLK_WaitClockReady(CLK_STATUS_LXTSTB_Msk); + + /* Switch HCLK clock source to HXT */ + CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HXT,CLK_CLKDIV0_HCLK(1)); + + /* Set PLL to power down mode and PLLSTB bit in CLKSTATUS register will be cleared by hardware.*/ + CLK->PLLCTL|= CLK_PLLCTL_PD_Msk; + + /* Set PLL frequency */ + CLK->PLLCTL = CLK_PLLCTL_84MHz_HXT; + + /* Waiting for clock ready */ + CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk); + + /* Switch HCLK clock source to PLL */ + CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL,CLK_CLKDIV0_HCLK(1)); + + /* Enable IP clock */ + //CLK_EnableModuleClock(UART0_MODULE); + + /* Select IP clock source */ + //CLK_SetModuleClock(UART0_MODULE,CLK_CLKSEL1_UARTSEL_HXT,CLK_CLKDIV0_UART(1)); + +#if DEVICE_ANALOGIN + /* Vref connect to AVDD */ + SYS->VREFCTL = (SYS->VREFCTL & ~SYS_VREFCTL_VREFCTL_Msk) | SYS_VREFCTL_VREF_AVDD; +#endif + + /* Update System Core Clock */ + /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */ + SystemCoreClockUpdate(); + + /* Lock protected registers */ + SYS_LockReg(); +} + +void mbed_sdk_init_forced(void) +{ + mbed_sdk_init(); +}