* arch/arm/src/tiva/tiva_sysctrl.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_TIVA_TIVA_SYSCTRL_H
#define __ARCH_ARM_SRC_TIVA_TIVA_SYSCTRL_H
* Included Files
****************************************************************************/
#include <nuttx/config.h>
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_ARCH_CHIP_TM4C129
# define M2PLLFREQ0(mint,mfrac) \
((uint32_t)((mint) << SYSCON_PLLFREQ0_MINT_SHIFT) | \
(uint32_t)((mfrac) << SYSCON_PLLFREQ0_MFRAC_SHIFT))
# define QN2PLLFREQ1(q,n) \
((uint32_t)(((n) - 1) << SYSCON_PLLFREQ1_N_SHIFT) | \
(uint32_t)(((q) - 1) << SYSCON_PLLFREQ1_Q_SHIFT))
#endif
* Public Types
****************************************************************************/
* Inline Functions
****************************************************************************/
#ifndef __ASSEMBLY__
* Public Data
****************************************************************************/
#if defined(__cplusplus)
extern "C"
{
#endif
* Public Function Prototypes
****************************************************************************/
#if defined(CONFIG_ARCH_CHIP_TM4C129)
* Name: tiva_clock_reconfigure
*
* Description:
* Called to change to new clock based on desired pllfreq0, pllfreq1, and
* sysdiv settings. This is use to set up the initial clocking but can be
* used later to support slow clocked, low power consumption modes.
*
* The pllfreq0 and pllfreq1 settings derive from the PLL M, N, and Q
* values to generate Fvco like:
*
* Fin = Fxtal / Q / N -OR- Fpiosc / Q / N
* Mdiv = Mint + (MFrac / 1024)
* Fvco = Fin * Mdiv
*
* When the PLL is active, the system clock frequency (SysClk) is
* calculated using the following equation:
*
* SysClk = Fvco/ sysdiv
*
* NOTE: The input clock to the PLL may be either the external crystal
* (Fxtal) or PIOSC (Fpiosc). This logic supports only the external
* crystal as the PLL source clock.
*
* Input Parameters:
* pllfreq0 - PLLFREQ0 register value (see helper macro M2PLLFREQ0()
* pllfreq1 - PLLFREQ1 register value (see helper macro QN2PLLFREQ1()
* sysdiv - Fvco divider value
*
* Returned Value:
* The resulting SysClk frequency
*
****************************************************************************/
uint32_t tiva_clock_reconfigure(uint32_t pllfreq0, uint32_t pllfreq1,
uint32_t sysdiv);
#else
* Name: tiva_clock_reconfigure
*
* Description:
* Called to change to new clock based on desired rcc and rcc2 settings.
* This is use to set up the initial clocking but can be used later to
* support slow clocked, low power consumption modes.
*
****************************************************************************/
void tiva_clock_reconfigure(uint32_t newrcc, uint32_t newrcc2);
#endif
* Name: tiva_clock_configure
*
* Description:
* Called early in the boot sequence (before .data and .bss are available)
* in order to configure initial clocking.
*
****************************************************************************/
void tiva_clock_configure(void);
#if defined(__cplusplus)
}
#endif
#endif
#endif