diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/TARGET_MAX32600MBED/low_level_init.c')
-rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/TARGET_MAX32600MBED/low_level_init.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/TARGET_MAX32600MBED/low_level_init.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/TARGET_MAX32600MBED/low_level_init.c new file mode 100644 index 0000000000..66dc6462eb --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/TARGET_MAX32600MBED/low_level_init.c @@ -0,0 +1,88 @@ +/******************************************************************************* + * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES + * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the name of Maxim Integrated + * Products, Inc. shall not be used except as stated in the Maxim Integrated + * Products, Inc. Branding Policy. + * + * The mere transfer of this software does not imply any licenses + * of trade secrets, proprietary technology, copyrights, patents, + * trademarks, maskwork rights, or any other form of intellectual + * property whatsoever. Maxim Integrated Products, Inc. retains all + * ownership rights. + ******************************************************************************* + */ + +#include "cmsis.h" +#include "gpio_regs.h" +#include "clkman_regs.h" + +/* Application developer should override where necessary with different external HFX source */ +#ifndef __SYSTEM_HFX +#define __SYSTEM_HFX 24000000 +#endif + +//****************************************************************************** +// This function will get called early in system initialization +void low_level_init(void) +{ + /* wait for the RO to stabilize */ + while (!(MXC_CLKMAN->intfl & MXC_F_CLKMAN_INTFL_RING_STABLE)); + + /* Configure and enable the oscillator */ + if (!(MXC_CLKMAN->clk_config & MXC_F_CLKMAN_CLK_CONFIG_HFX_ENABLE)) { + + MXC_CLKMAN->clk_config = (0x4 << MXC_F_CLKMAN_CLK_CONFIG_HFX_GM_ADJUST_POS); + + /* Enable the external crystal */ + MXC_CLKMAN->clk_config |= MXC_F_CLKMAN_CLK_CONFIG_HFX_ENABLE; + } + + /* Wait for external crystal to stabilize */ + for (volatile int waitcnt = 0; waitcnt < 0x4000; waitcnt++); // 0x4000 ~10ms 0x10000 ~35ms, 0x20000 ~75ms + + /* Configure the PLL */ + uint32_t clk_config = MXC_CLKMAN->clk_config; + 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); + +#if (__SYSTEM_HFX == 8000000) + 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); +#elif (__SYSTEM_HFX == 12000000) + 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); +#elif (__SYSTEM_HFX == 24000000) + 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); +#else +#error Invalid __SYSTEM_HFX setting +#endif + + clk_config |= MXC_F_CLKMAN_CLK_CONFIG_PLL_8MHZ_ENABLE; + clk_config &= ~MXC_F_CLKMAN_CLK_CONFIG_PLL_BYPASS; + 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); + MXC_CLKMAN->clk_config = clk_config; + + /* Enable the PLL and wait for stable */ + MXC_CLKMAN->clk_config |= (MXC_F_CLKMAN_CLK_CONFIG_PLL_ENABLE | MXC_F_CLKMAN_CLK_CONFIG_PLL_RESET_N); + while (!(MXC_CLKMAN->intfl & MXC_F_CLKMAN_INTFL_PLL_STABLE)); + + /* Switch to the PLL */ + MXC_CLKMAN->clk_ctrl = (MXC_CLKMAN->clk_ctrl & ~MXC_F_CLKMAN_CLK_CTRL_SYSTEM_SOURCE_SELECT) | + ((MXC_E_CLKMAN_SYSTEM_SOURCE_SELECT_PLL_48MHZ_DIV_2 << MXC_F_CLKMAN_CLK_CTRL_SYSTEM_SOURCE_SELECT_POS)); +} |