/* ** ################################################################### ** Processors: LPC54114J256BD64_cm0plus ** LPC54114J256UK49_cm0plus ** ** Compilers: Keil ARM C/C++ Compiler ** GNU C Compiler ** IAR ANSI C/C++ Compiler for ARM ** MCUXpresso Compiler ** ** Reference manual: LPC5411x User manual Rev. 1.1 25 May 2016 ** Version: rev. 1.0, 2016-04-29 ** Build: b161227 ** ** Abstract: ** Provides a system configuration function and a global variable that ** contains the system frequency. It configures the device and initializes ** the oscillator (PLL) that is part of the microcontroller device. ** ** The Clear BSD License ** Copyright (c) 2016 Freescale Semiconductor, Inc. ** Copyright 2016 - 2017 NXP ** All rights reserved. ** ** Redistribution and use in source and binary forms, with or without modification, ** are permitted (subject to the limitations in the disclaimer below) provided ** that the following conditions are met: ** ** o Redistributions of source code must retain the above copyright notice, this list ** of conditions and the following disclaimer. ** ** o Redistributions in binary form must reproduce the above copyright notice, this ** list of conditions and the following disclaimer in the documentation and/or ** other materials provided with the distribution. ** ** o Neither the name of the copyright holder nor the names of its ** contributors may be used to endorse or promote products derived from this ** software without specific prior written permission. ** ** NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE. ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED ** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE ** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ** ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ** ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ** ** http: www.nxp.com ** mail: support@nxp.com ** ** Revisions: ** - rev. 1.0 (2016-04-29) ** Initial version. ** ** ################################################################### */ /*! * @file LPC54114_cm0plus * @version 1.0 * @date 2016-04-29 * @brief Device specific configuration file for LPC54114_cm0plus * (implementation file) * * Provides a system configuration function and a global variable that contains * the system frequency. It configures the device and initializes the oscillator * (PLL) that is part of the microcontroller device. */ #include #include "fsl_device_registers.h" #define NVALMAX (0x100) #define PVALMAX (0x20) #define MVALMAX (0x8000) #define PLL_SSCG0_MDEC_VAL_P (0) /* MDEC is in bits 16 downto 0 */ #define PLL_SSCG0_MDEC_VAL_M (0x1FFFFUL << PLL_SSCG0_MDEC_VAL_P) /* NDEC is in bits 9 downto 0 */ #define PLL_NDEC_VAL_P (0) /* NDEC is in bits 9:0 */ #define PLL_NDEC_VAL_M (0x3FFUL << PLL_NDEC_VAL_P) #define PLL_PDEC_VAL_P (0) /* PDEC is in bits 6:0 */ #define PLL_PDEC_VAL_M (0x3FFUL << PLL_PDEC_VAL_P) extern void *__Vectors; /* ---------------------------------------------------------------------------- -- Core clock ---------------------------------------------------------------------------- */ uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK; static const uint8_t wdtFreqLookup[32] = {0, 8, 12, 15, 18, 20, 24, 26, 28, 30, 32, 34, 36, 38, 40, 41, 42, 44, 45, 46, 48, 49, 50, 52, 53, 54, 56, 57, 58, 59, 60, 61}; static uint32_t GetWdtOscFreq(void) { uint8_t freq_sel, div_sel; div_sel = ((SYSCON->WDTOSCCTRL & SYSCON_WDTOSCCTRL_DIVSEL_MASK) + 1) << 1; freq_sel = wdtFreqLookup[((SYSCON->WDTOSCCTRL & SYSCON_WDTOSCCTRL_FREQSEL_MASK) >> SYSCON_WDTOSCCTRL_FREQSEL_SHIFT)]; return ((uint32_t) freq_sel * 50000U)/((uint32_t)div_sel); } /* Find decoded N value for raw NDEC value */ static uint32_t pllDecodeN(uint32_t NDEC) { uint32_t n, x, i; /* Find NDec */ switch (NDEC) { case 0xFFF: n = 0; break; case 0x302: n = 1; break; case 0x202: n = 2; break; default: x = 0x080; n = 0xFFFFFFFF; for (i = NVALMAX; ((i >= 3) && (n == 0xFFFFFFFF)); i--) { x = (((x ^ (x >> 2) ^ (x >> 3) ^ (x >> 4)) & 1) << 7) | ((x >> 1) & 0x7F); if ((x & (PLL_NDEC_VAL_M >> PLL_NDEC_VAL_P)) == NDEC) { /* Decoded value of NDEC */ n = i; } } break; } return n; } /* Find decoded P value for raw PDEC value */ static uint32_t pllDecodeP(uint32_t PDEC) { uint32_t p, x, i; /* Find PDec */ switch (PDEC) { case 0xFF: p = 0; break; case 0x62: p = 1; break; case 0x42: p = 2; break; default: x = 0x10; p = 0xFFFFFFFF; for (i = PVALMAX; ((i >= 3) && (p == 0xFFFFFFFF)); i--) { x = (((x ^ (x >> 2)) & 1) << 4) | ((x >> 1) & 0xF); if ((x & (PLL_PDEC_VAL_M >> PLL_PDEC_VAL_P)) == PDEC) { /* Decoded value of PDEC */ p = i; } } break; } return p; } /* Find decoded M value for raw MDEC value */ static uint32_t pllDecodeM(uint32_t MDEC) { uint32_t m, i, x; /* Find MDec */ switch (MDEC) { case 0xFFFFF: m = 0; break; case 0x18003: m = 1; break; case 0x10003: m = 2; break; default: x = 0x04000; m = 0xFFFFFFFF; for (i = MVALMAX; ((i >= 3) && (m == 0xFFFFFFFF)); i--) { x = (((x ^ (x >> 1)) & 1) << 14) | ((x >> 1) & 0x3FFF); if ((x & (PLL_SSCG0_MDEC_VAL_M >> PLL_SSCG0_MDEC_VAL_P)) == MDEC) { /* Decoded value of MDEC */ m = i; } } break; } return m; } /* Get predivider (N) from PLL NDEC setting */ static uint32_t findPllPreDiv(uint32_t ctrlReg, uint32_t nDecReg) { uint32_t preDiv = 1; /* Direct input is not used? */ if ((ctrlReg & SYSCON_SYSPLLCTRL_DIRECTI_MASK) == 0) { /* Decode NDEC value to get (N) pre divider */ preDiv = pllDecodeN(nDecReg & 0x3FF); if (preDiv == 0) { preDiv = 1; } } /* Adjusted by 1, directi is used to bypass */ return preDiv; } /* Get postdivider (P) from PLL PDEC setting */ static uint32_t findPllPostDiv(uint32_t ctrlReg, uint32_t pDecReg) { uint32_t postDiv = 1; /* Direct input is not used? */ if ((ctrlReg & SYSCON_SYSPLLCTRL_DIRECTO_MASK) == 0) { /* Decode PDEC value to get (P) post divider */ postDiv = 2 * pllDecodeP(pDecReg & 0x7F); if (postDiv == 0) { postDiv = 2; } } /* Adjusted by 1, directo is used to bypass */ return postDiv; } /* Get multiplier (M) from PLL MDEC and BYPASS_FBDIV2 settings */ static uint32_t findPllMMult(uint32_t ctrlReg, uint32_t mDecReg) { uint32_t mMult = 1; /* Decode MDEC value to get (M) multiplier */ mMult = pllDecodeM(mDecReg & 0x1FFFF); /* Extra multiply by 2 needed? */ if ((ctrlReg & SYSCON_SYSPLLCTRL_BYPASSCCODIV2_MASK) == 0) { mMult = mMult << 1; } if (mMult == 0) { mMult = 1; } return mMult; } /* ---------------------------------------------------------------------------- -- SystemInit() ---------------------------------------------------------------------------- */ void SystemInit(void) { SCB->VTOR = (uint32_t)&__Vectors; SystemInitHook(); } /* ---------------------------------------------------------------------------- -- SystemCoreClockUpdate() ---------------------------------------------------------------------------- */ void SystemCoreClockUpdate(void) { uint32_t clkRate = 0; uint32_t prediv, postdiv; uint64_t workRate; switch (SYSCON->MAINCLKSELB & SYSCON_MAINCLKSELB_SEL_MASK) { case 0x00: /* MAINCLKSELA clock (main_clk_a)*/ switch (SYSCON->MAINCLKSELA & SYSCON_MAINCLKSELA_SEL_MASK) { case 0x00: /* FRO 12 MHz (fro_12m) */ clkRate = CLK_FRO_12MHZ; break; case 0x01: /* CLKIN (clk_in) */ clkRate = CLK_CLK_IN; break; case 0x02: /* Watchdog oscillator (wdt_clk) */ clkRate = GetWdtOscFreq(); break; default: /* = 0x03 = FRO 96 or 48 MHz (fro_hf) */ if (SYSCON->FROCTRL & SYSCON_FROCTRL_SEL_MASK) { clkRate = CLK_FRO_96MHZ; } else { clkRate = CLK_FRO_48MHZ; } break; } break; case 0x02: /* System PLL clock (pll_clk)*/ switch (SYSCON->SYSPLLCLKSEL & SYSCON_SYSPLLCLKSEL_SEL_MASK) { case 0x00: /* FRO 12 MHz (fro_12m) */ clkRate = CLK_FRO_12MHZ; break; case 0x01: /* CLKIN (clk_in) */ clkRate = CLK_CLK_IN; break; case 0x02: /* Watchdog oscillator (wdt_clk) */ clkRate = GetWdtOscFreq(); break; case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */ clkRate = CLK_RTC_32K_CLK; break; default: break; } if ((SYSCON->SYSPLLCTRL & SYSCON_SYSPLLCTRL_BYPASS_MASK) == 0) { /* PLL is not in bypass mode, get pre-divider, post-divider, and M divider */ prediv = findPllPreDiv(SYSCON->SYSPLLCTRL, SYSCON->SYSPLLNDEC); postdiv = findPllPostDiv(SYSCON->SYSPLLCTRL, SYSCON->SYSPLLPDEC); /* Adjust input clock */ clkRate = clkRate / prediv; /* If using the SS, use the multiplier */ if (SYSCON->SYSPLLSSCTRL1 & SYSCON_SYSPLLSSCTRL1_PD_MASK) { /* MDEC used for rate */ workRate = (uint64_t)clkRate * (uint64_t)findPllMMult(SYSCON->SYSPLLCTRL, SYSCON->SYSPLLSSCTRL0); } else { /* SS multipler used for rate */ workRate = 0; /* Adjust by fractional */ workRate = workRate + ((clkRate * (uint64_t)((SYSCON->SYSPLLSSCTRL1 & 0x7FF) >> 0)) / 0x800); } clkRate = workRate / ((uint64_t)postdiv); } break; case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */ clkRate = CLK_RTC_32K_CLK; break; default: break; } SystemCoreClock = clkRate / ((SYSCON->AHBCLKDIV & 0xFF) + 1); } /* ---------------------------------------------------------------------------- -- SystemInitHook() ---------------------------------------------------------------------------- */ __attribute__ ((weak)) void SystemInitHook (void) { /* Void implementation of the weak function. */ }