80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
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* Copyright (C) 2013 Silvio Gissi <silvio.gissi@outlook.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <unicore-mx/lpc17xx/clock.h>
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const clock_scale_t clock_scale[] = {
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{
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/* ( 2 * M * Fin ) / N = 200MHz
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* Final div = 2
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* Clk = 96MHz
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*/
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.m = 25,
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.n = 3,
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.cclkdiv = 2,
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},
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{
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/* ( 2 * M * Fin ) / N = 240MHz
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* Final div = 2
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* Clk = 120MHz
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*/
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.m = 30,
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.n = 3,
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.cclkdiv = 2,
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}
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};
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void clock_setup(const clock_scale_t *clock)
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{
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/* Enable the external clock */
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CLK_SCS |= CLK_SCS_OSCEN;
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while ((CLK_SCS & CLK_SCS_OSCSTAT) == 0);
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/* Select external oscilator */
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CLK_CLKSRCSEL = CLK_CLKSRCSEL_MAIN;
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CLK_PLL0CFG = PLL0_CFG_VAL(clock->m, clock->n);
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/*Feed*/
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CLK_PLL0FEED = PLL_KICK0;
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CLK_PLL0FEED = PLL_KICK1;
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/*PLL0 Enable */
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CLK_PLL0CON = CLK_PLLCON_ENABLE;
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/*Feed*/
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CLK_PLL0FEED = PLL_KICK0;
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CLK_PLL0FEED = PLL_KICK1;
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/* Divide by 3 */
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CLK_CCLKCFG = clock->cclkdiv;
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/* wait until locked */
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while (!(CLK_PLL0STAT & CLK_PLL0STAT_PLOCK));
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/* see flash accelerator - TBD */
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/* _FLASHCFG = (_FLASHCFG & 0xFFF) | (4<<12); */
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/* PLL0 connect */
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CLK_PLL0CON |= CLK_PLLCON_CONNECT;
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/*Feed*/
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CLK_PLL0FEED = PLL_KICK0;
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CLK_PLL0FEED = PLL_KICK1;
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/* PLL0 operational */
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}
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