Jonathan Piat / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_Maxim/TARGET_MAX32600/TARGET_MAX32600MBED/low_level_init.c@514:7668256dbe61, 2015-04-16 (annotated)

Committer:
mbed_official
Date:
Thu Apr 16 11:45:13 2015 +0100
Revision:
514:7668256dbe61
Child:
515:7467ef1f4ad8
Synchronized with git revision 29ab478a78892415a3c721cdc20b1755b7b01ba1



Full URL: https://github.com/mbedmicro/mbed/commit/29ab478a78892415a3c721cdc20b1755b7b01ba1/



LPC824, SSCI824 - Add GCC_ARM exporter support

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 514:7668256dbe61 1 /*******************************************************************************
mbed_official 514:7668256dbe61 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
mbed_official 514:7668256dbe61 3 *
mbed_official 514:7668256dbe61 4 * Permission is hereby granted, free of charge, to any person obtaining a
mbed_official 514:7668256dbe61 5 * copy of this software and associated documentation files (the "Software"),
mbed_official 514:7668256dbe61 6 * to deal in the Software without restriction, including without limitation
mbed_official 514:7668256dbe61 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
mbed_official 514:7668256dbe61 8 * and/or sell copies of the Software, and to permit persons to whom the
mbed_official 514:7668256dbe61 9 * Software is furnished to do so, subject to the following conditions:
mbed_official 514:7668256dbe61 10 *
mbed_official 514:7668256dbe61 11 * The above copyright notice and this permission notice shall be included
mbed_official 514:7668256dbe61 12 * in all copies or substantial portions of the Software.
mbed_official 514:7668256dbe61 13 *
mbed_official 514:7668256dbe61 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mbed_official 514:7668256dbe61 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
mbed_official 514:7668256dbe61 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
mbed_official 514:7668256dbe61 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
mbed_official 514:7668256dbe61 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
mbed_official 514:7668256dbe61 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
mbed_official 514:7668256dbe61 20 * OTHER DEALINGS IN THE SOFTWARE.
mbed_official 514:7668256dbe61 21 *
mbed_official 514:7668256dbe61 22 * Except as contained in this notice, the name of Maxim Integrated
mbed_official 514:7668256dbe61 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
mbed_official 514:7668256dbe61 24 * Products, Inc. Branding Policy.
mbed_official 514:7668256dbe61 25 *
mbed_official 514:7668256dbe61 26 * The mere transfer of this software does not imply any licenses
mbed_official 514:7668256dbe61 27 * of trade secrets, proprietary technology, copyrights, patents,
mbed_official 514:7668256dbe61 28 * trademarks, maskwork rights, or any other form of intellectual
mbed_official 514:7668256dbe61 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
mbed_official 514:7668256dbe61 30 * ownership rights.
mbed_official 514:7668256dbe61 31 *******************************************************************************
mbed_official 514:7668256dbe61 32 */
mbed_official 514:7668256dbe61 33
mbed_official 514:7668256dbe61 34 #include "cmsis.h"
mbed_official 514:7668256dbe61 35 #include "gpio_regs.h"
mbed_official 514:7668256dbe61 36 #include "clkman_regs.h"
mbed_official 514:7668256dbe61 37
mbed_official 514:7668256dbe61 38 /* Application developer should override where necessary with different external HFX source */
mbed_official 514:7668256dbe61 39 #ifndef __SYSTEM_HFX
mbed_official 514:7668256dbe61 40 #define __SYSTEM_HFX 24000000
mbed_official 514:7668256dbe61 41 #endif
mbed_official 514:7668256dbe61 42
mbed_official 514:7668256dbe61 43 //******************************************************************************
mbed_official 514:7668256dbe61 44 // This function will get called early in system initialization
mbed_official 514:7668256dbe61 45 void low_level_init(void)
mbed_official 514:7668256dbe61 46 {
mbed_official 514:7668256dbe61 47 /* wait for the RO to stabilize */
mbed_official 514:7668256dbe61 48 while (!(MXC_CLKMAN->intfl & MXC_F_CLKMAN_INTFL_RING_STABLE));
mbed_official 514:7668256dbe61 49
mbed_official 514:7668256dbe61 50 /* Configure and enable the oscillator */
mbed_official 514:7668256dbe61 51 if (!(MXC_CLKMAN->clk_config & MXC_F_CLKMAN_CLK_CONFIG_HFX_ENABLE)) {
mbed_official 514:7668256dbe61 52
mbed_official 514:7668256dbe61 53 MXC_CLKMAN->clk_config = (0x4 << MXC_F_CLKMAN_CLK_CONFIG_HFX_GM_ADJUST_POS);
mbed_official 514:7668256dbe61 54
mbed_official 514:7668256dbe61 55 /* Enable the external crystal */
mbed_official 514:7668256dbe61 56 MXC_CLKMAN->clk_config |= MXC_F_CLKMAN_CLK_CONFIG_HFX_ENABLE;
mbed_official 514:7668256dbe61 57 }
mbed_official 514:7668256dbe61 58
mbed_official 514:7668256dbe61 59 /* Wait for external crystal to stabilize */
mbed_official 514:7668256dbe61 60 for (volatile int waitcnt = 0; waitcnt < 0x4000; waitcnt++); // 0x4000 ~10ms 0x10000 ~35ms, 0x20000 ~75ms
mbed_official 514:7668256dbe61 61
mbed_official 514:7668256dbe61 62 /* Configure the PLL */
mbed_official 514:7668256dbe61 63 uint32_t clk_config = MXC_CLKMAN->clk_config;
mbed_official 514:7668256dbe61 64 clk_config = (clk_config & ~MXC_F_CLKMAN_CLK_CONFIG_PLL_INPUT_SELECT) | (MXC_E_CLKMAN_PLL_INPUT_SELECT_HFX << MXC_F_CLKMAN_CLK_CONFIG_PLL_INPUT_SELECT_POS);
mbed_official 514:7668256dbe61 65
mbed_official 514:7668256dbe61 66 #if (__SYSTEM_HFX == 8000000)
mbed_official 514:7668256dbe61 67 clk_config = (clk_config & ~MXC_F_CLKMAN_CLK_CONFIG_PLL_DIVISOR_SELECT) | (MXC_E_CLKMAN_PLL_DIVISOR_SELECT_8MHZ << MXC_F_CLKMAN_CLK_CONFIG_PLL_DIVISOR_SELECT_POS);
mbed_official 514:7668256dbe61 68 #elif (__SYSTEM_HFX == 12000000)
mbed_official 514:7668256dbe61 69 clk_config = (clk_config & ~MXC_F_CLKMAN_CLK_CONFIG_PLL_DIVISOR_SELECT) | (MXC_E_CLKMAN_PLL_DIVISOR_SELECT_12MHZ << MXC_F_CLKMAN_CLK_CONFIG_PLL_DIVISOR_SELECT_POS);
mbed_official 514:7668256dbe61 70 #elif (__SYSTEM_HFX == 24000000)
mbed_official 514:7668256dbe61 71 clk_config = (clk_config & ~MXC_F_CLKMAN_CLK_CONFIG_PLL_DIVISOR_SELECT) | (MXC_E_CLKMAN_PLL_DIVISOR_SELECT_24MHZ << MXC_F_CLKMAN_CLK_CONFIG_PLL_DIVISOR_SELECT_POS);
mbed_official 514:7668256dbe61 72 #else
mbed_official 514:7668256dbe61 73 #error Invalid __SYSTEM_HFX setting
mbed_official 514:7668256dbe61 74 #endif
mbed_official 514:7668256dbe61 75
mbed_official 514:7668256dbe61 76 clk_config |= MXC_F_CLKMAN_CLK_CONFIG_PLL_8MHZ_ENABLE;
mbed_official 514:7668256dbe61 77 clk_config &= ~MXC_F_CLKMAN_CLK_CONFIG_PLL_BYPASS;
mbed_official 514:7668256dbe61 78 clk_config = (clk_config & ~MXC_F_CLKMAN_CLK_CONFIG_PLL_STABILITY_COUNT) | (MXC_E_CLKMAN_STABILITY_COUNT_2_13_CLKS << MXC_F_CLKMAN_CLK_CONFIG_PLL_STABILITY_COUNT_POS);
mbed_official 514:7668256dbe61 79 MXC_CLKMAN->clk_config = clk_config;
mbed_official 514:7668256dbe61 80
mbed_official 514:7668256dbe61 81 /* Enable the PLL and wait for stable */
mbed_official 514:7668256dbe61 82 MXC_CLKMAN->clk_config |= (MXC_F_CLKMAN_CLK_CONFIG_PLL_ENABLE | MXC_F_CLKMAN_CLK_CONFIG_PLL_RESET_N);
mbed_official 514:7668256dbe61 83 while (!(MXC_CLKMAN->intfl & MXC_F_CLKMAN_INTFL_PLL_STABLE));
mbed_official 514:7668256dbe61 84
mbed_official 514:7668256dbe61 85 /* Switch to the PLL */
mbed_official 514:7668256dbe61 86 MXC_CLKMAN->clk_ctrl = (MXC_CLKMAN->clk_ctrl & ~MXC_F_CLKMAN_CLK_CTRL_SYSTEM_SOURCE_SELECT) |
mbed_official 514:7668256dbe61 87 ((MXC_E_CLKMAN_SYSTEM_SOURCE_SELECT_PLL_48MHZ_DIV_2 << MXC_F_CLKMAN_CLK_CTRL_SYSTEM_SOURCE_SELECT_POS));
mbed_official 514:7668256dbe61 88 }