113 lines
2.1 KiB
C
113 lines
2.1 KiB
C
/*
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* File : clock.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-03-20 zchong first version
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*/
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#include <rtthread.h>
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#include "sep4020.h"
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#define CLK_IN 4000000 /* Fin = 4.00MHz */
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#define SYSCLK 72000000 /* system clock we want */
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#define CLK_ESRAM 0
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#define CLK_LCDC 1
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#define CLK_PWM 2
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#define CLK_DMAC 3
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#define CLK_EMI 4
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#define CLK_MMCSD 5
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#define CLK_SSI 7
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#define CLK_UART0 8
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#define CLK_UART1 9
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#define CLK_UART2 10
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#define CLK_UART3 11
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#define CLK_USB 12
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#define CLK_MAC 13
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#define CLK_SMC 14
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#define CLK_I2C 15
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#define CLK_GPT 16
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static void rt_hw_set_system_clock(void)
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{
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rt_uint8_t pv;
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/* pv value*/
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pv = SYSCLK/2/CLK_IN;
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/* go to normal mode*/
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PMC_PMDR = 0x01;
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/* set the clock */
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PMC_PMCR = 0x4000 | pv;
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/* trige configurate*/
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PMC_PMCR = 0xc000 | pv;
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}
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static void rt_hw_set_usb_clock(void)
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{
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/* set the clock */
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PMC_PUCR = 0x000c;
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/* trige configurate*/
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PMC_PMCR = 0x800c;
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}
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/**
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* @brief System Clock Configuration
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*/
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void rt_hw_clock_init(void)
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{
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/* set system clock */
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rt_hw_set_system_clock();
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/* set usb clock */
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rt_hw_set_usb_clock();
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}
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/**
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* @brief Get system clock
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*/
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rt_uint32_t rt_hw_get_clock(void)
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{
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rt_uint32_t val;
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rt_uint8_t pv, pd, npd;
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/* get PMCR value */
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val = PMC_PMCR;
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/* get NPD */
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npd = (val >> 14) & 0x01;
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/* get PD */
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pd = (val >> 10) & 0x0f;
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/* get PV */
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pv = val & 0x7f;
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/* caculate the system clock */
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if(npd)
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val = 2 * CLK_IN * pv;
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else
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val = CLK_IN * pv / (pd + 1);
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return(val);
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}
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/**
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* @brief Enable module clock
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*/
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void rt_hw_enable_module_clock(rt_uint8_t module)
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{
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}
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/**
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* @brief Disable module clock
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*/
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void rt_hw_disable_module_clock(rt_uint8_t module)
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{
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}
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