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1/*
2** ###################################################################
3** Processors: LPC55S26JBD100
4** LPC55S26JBD64
5** LPC55S26JEV98
6**
7** Compilers: GNU C Compiler
8** IAR ANSI C/C++ Compiler for ARM
9** Keil ARM C/C++ Compiler
10** MCUXpresso Compiler
11**
12** Reference manual: LPC55S6x/LPC55S2x/LPC552x User manual(UM11126) Rev.1.3 16 May 2019
13** Version: rev. 1.1, 2019-05-16
14** Build: b200418
15**
16** Abstract:
17** Provides a system configuration function and a global variable that
18** contains the system frequency. It configures the device and initializes
19** the oscillator (PLL) that is part of the microcontroller device.
20**
21** Copyright 2016 Freescale Semiconductor, Inc.
22** Copyright 2016-2020 NXP
23** All rights reserved.
24**
25** SPDX-License-Identifier: BSD-3-Clause
26**
27** http: www.nxp.com
28** mail: [email protected]
29**
30** Revisions:
31** - rev. 1.0 (2018-08-22)
32** Initial version based on v0.2UM
33** - rev. 1.1 (2019-05-16)
34** Initial A1 version based on v1.3UM
35**
36** ###################################################################
37*/
38
39/*!
40 * @file LPC55S26
41 * @version 1.1
42 * @date 2019-05-16
43 * @brief Device specific configuration file for LPC55S26 (implementation file)
44 *
45 * Provides a system configuration function and a global variable that contains
46 * the system frequency. It configures the device and initializes the oscillator
47 * (PLL) that is part of the microcontroller device.
48 */
49
50#include <stdint.h>
51#include "fsl_device_registers.h"
52
53/* PLL0 SSCG control1 */
54#define PLL_SSCG_MD_FRACT_P 0U
55#define PLL_SSCG_MD_INT_P 25U
56#define PLL_SSCG_MD_FRACT_M (0x1FFFFFFUL << PLL_SSCG_MD_FRACT_P)
57#define PLL_SSCG_MD_INT_M ((uint64_t)0xFFUL << PLL_SSCG_MD_INT_P)
58
59/* Get predivider (N) from PLL0 NDEC setting */
60static uint32_t findPll0PreDiv(void)
61{
62 uint32_t preDiv = 1UL;
63
64 /* Direct input is not used? */
65 if ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPREDIV_MASK) == 0UL)
66 {
67 preDiv = SYSCON->PLL0NDEC & SYSCON_PLL0NDEC_NDIV_MASK;
68 if (preDiv == 0UL)
69 {
70 preDiv = 1UL;
71 }
72 }
73 return preDiv;
74}
75
76/* Get postdivider (P) from PLL0 PDEC setting */
77static uint32_t findPll0PostDiv(void)
78{
79 uint32_t postDiv = 1;
80
81 if ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPOSTDIV_MASK) == 0UL)
82 {
83 if ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPOSTDIV2_MASK) != 0UL)
84 {
85 postDiv = SYSCON->PLL0PDEC & SYSCON_PLL0PDEC_PDIV_MASK;
86 }
87 else
88 {
89 postDiv = 2UL * (SYSCON->PLL0PDEC & SYSCON_PLL0PDEC_PDIV_MASK);
90 }
91 if (postDiv == 0UL)
92 {
93 postDiv = 2UL;
94 }
95 }
96 return postDiv;
97}
98
99/* Get multiplier (M) from PLL0 SSCG and SEL_EXT settings */
100static float findPll0MMult(void)
101{
102 float mMult = 1.0F;
103 float mMult_fract;
104 uint32_t mMult_int;
105
106 if ((SYSCON->PLL0SSCG1 & SYSCON_PLL0SSCG1_SEL_EXT_MASK) != 0UL)
107 {
108 mMult = (float)(uint32_t)((SYSCON->PLL0SSCG1 & SYSCON_PLL0SSCG1_MDIV_EXT_MASK) >> SYSCON_PLL0SSCG1_MDIV_EXT_SHIFT);
109 }
110 else
111 {
112 mMult_int = ((SYSCON->PLL0SSCG1 & SYSCON_PLL0SSCG1_MD_MBS_MASK) << 7U);
113 mMult_int = mMult_int | ((SYSCON->PLL0SSCG0) >> PLL_SSCG_MD_INT_P);
114 mMult_fract = ((float)(uint32_t)((SYSCON->PLL0SSCG0) & PLL_SSCG_MD_FRACT_M) /
115 (float)(uint32_t)(1UL << PLL_SSCG_MD_INT_P));
116 mMult = (float)mMult_int + mMult_fract;
117 }
118 if (mMult == 0.0F)
119 {
120 mMult = 1.0F;
121 }
122 return mMult;
123}
124
125/* Get predivider (N) from PLL1 NDEC setting */
126static uint32_t findPll1PreDiv(void)
127{
128 uint32_t preDiv = 1UL;
129
130 /* Direct input is not used? */
131 if ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPREDIV_MASK) == 0UL)
132 {
133 preDiv = SYSCON->PLL1NDEC & SYSCON_PLL1NDEC_NDIV_MASK;
134 if (preDiv == 0UL)
135 {
136 preDiv = 1UL;
137 }
138 }
139 return preDiv;
140}
141
142/* Get postdivider (P) from PLL1 PDEC setting */
143static uint32_t findPll1PostDiv(void)
144{
145 uint32_t postDiv = 1UL;
146
147 if ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPOSTDIV_MASK) == 0UL)
148 {
149 if ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPOSTDIV2_MASK) != 0UL)
150 {
151 postDiv = SYSCON->PLL1PDEC & SYSCON_PLL1PDEC_PDIV_MASK;
152 }
153 else
154 {
155 postDiv = 2UL * (SYSCON->PLL1PDEC & SYSCON_PLL1PDEC_PDIV_MASK);
156 }
157 if (postDiv == 0UL)
158 {
159 postDiv = 2UL;
160 }
161 }
162 return postDiv;
163}
164
165/* Get multiplier (M) from PLL1 MDEC settings */
166static uint32_t findPll1MMult(void)
167{
168 uint32_t mMult = 1UL;
169
170 mMult = SYSCON->PLL1MDEC & SYSCON_PLL1MDEC_MDIV_MASK;
171
172 if (mMult == 0UL)
173 {
174 mMult = 1UL;
175 }
176 return mMult;
177}
178
179/* Get FRO 12M Clk */
180/*! brief Return Frequency of FRO 12MHz
181 * return Frequency of FRO 12MHz
182 */
183static uint32_t GetFro12MFreq(void)
184{
185 return ((ANACTRL->FRO192M_CTRL & ANACTRL_FRO192M_CTRL_ENA_12MHZCLK_MASK) != 0UL) ? 12000000U : 0U;
186}
187
188/* Get FRO 1M Clk */
189/*! brief Return Frequency of FRO 1MHz
190 * return Frequency of FRO 1MHz
191 */
192static uint32_t GetFro1MFreq(void)
193{
194 return ((SYSCON->CLOCK_CTRL & SYSCON_CLOCK_CTRL_FRO1MHZ_CLK_ENA_MASK) != 0UL) ? 1000000U : 0U;
195}
196
197/* Get EXT OSC Clk */
198/*! brief Return Frequency of External Clock
199 * return Frequency of External Clock. If no external clock is used returns 0.
200 */
201static uint32_t GetExtClkFreq(void)
202{
203 return ((ANACTRL->XO32M_CTRL & ANACTRL_XO32M_CTRL_ENABLE_SYSTEM_CLK_OUT_MASK) != 0UL) ? CLK_CLK_IN : 0U;
204}
205
206/* Get HF FRO Clk */
207/*! brief Return Frequency of High-Freq output of FRO
208 * return Frequency of High-Freq output of FRO
209 */
210static uint32_t GetFroHfFreq(void)
211{
212 return ((ANACTRL->FRO192M_CTRL & ANACTRL_FRO192M_CTRL_ENA_96MHZCLK_MASK) != 0UL) ? 96000000U : 0U;
213}
214
215/* Get RTC OSC Clk */
216/*! brief Return Frequency of 32kHz osc
217 * return Frequency of 32kHz osc
218 */
219static uint32_t GetOsc32KFreq(void)
220{
221 return ((0UL == (PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_FRO32K_MASK)) && (0UL == (PMC->RTCOSC32K & PMC_RTCOSC32K_SEL_MASK))) ?
222 CLK_RTC_32K_CLK :
223 ((0UL == (PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_XTAL32K_MASK)) && ((PMC->RTCOSC32K & PMC_RTCOSC32K_SEL_MASK) != 0UL)) ?
224 CLK_RTC_32K_CLK :
225 0U;
226}
227
228
229
230/* ----------------------------------------------------------------------------
231 -- Core clock
232 ---------------------------------------------------------------------------- */
233
234uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
235
236/* ----------------------------------------------------------------------------
237 -- SystemInit()
238 ---------------------------------------------------------------------------- */
239
240__attribute__((weak)) void SystemInit (void) {
241#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1))
242 SCB->CPACR |= ((3UL << 10*2) | (3UL << 11*2)); /* set CP10, CP11 Full Access in Secure mode */
243 #if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
244 SCB_NS->CPACR |= ((3UL << 10*2) | (3UL << 11*2)); /* set CP10, CP11 Full Access in Non-secure mode */
245 #endif /* (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) */
246#endif /* ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) */
247
248 SCB->CPACR |= ((3UL << 0*2) | (3UL << 1*2)); /* set CP0, CP1 Full Access in Secure mode (enable PowerQuad) */
249#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
250 SCB_NS->CPACR |= ((3UL << 0*2) | (3UL << 1*2)); /* set CP0, CP1 Full Access in Normal mode (enable PowerQuad) */
251#endif /* (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) */
252
253 SCB->NSACR |= ((3UL << 0) | (3UL << 10)); /* enable CP0, CP1, CP10, CP11 Non-secure Access */
254
255#if defined(__MCUXPRESSO)
256 extern void(*const g_pfnVectors[]) (void);
257 SCB->VTOR = (uint32_t) &g_pfnVectors;
258#else
259 extern void *__Vectors;
260 SCB->VTOR = (uint32_t) &__Vectors;
261#endif
262 SYSCON->TRACECLKDIV = 0;
263/* Optionally enable RAM banks that may be off by default at reset */
264#if !defined(DONT_ENABLE_DISABLED_RAMBANKS)
265 SYSCON->AHBCLKCTRLSET[0] = SYSCON_AHBCLKCTRL0_SRAM_CTRL1_MASK | SYSCON_AHBCLKCTRL0_SRAM_CTRL2_MASK
266 | SYSCON_AHBCLKCTRL0_SRAM_CTRL3_MASK | SYSCON_AHBCLKCTRL0_SRAM_CTRL4_MASK;
267#endif
268 SystemInitHook();
269}
270
271/* ----------------------------------------------------------------------------
272 -- SystemCoreClockUpdate()
273 ---------------------------------------------------------------------------- */
274
275void SystemCoreClockUpdate (void) {
276 uint32_t clkRate = 0;
277 uint32_t prediv, postdiv;
278 uint64_t workRate;
279 uint64_t workRate1;
280
281 switch (SYSCON->MAINCLKSELB & SYSCON_MAINCLKSELB_SEL_MASK)
282 {
283 case 0x00: /* MAINCLKSELA clock (main_clk_a)*/
284 switch (SYSCON->MAINCLKSELA & SYSCON_MAINCLKSELA_SEL_MASK)
285 {
286 case 0x00: /* FRO 12 MHz (fro_12m) */
287 clkRate = GetFro12MFreq();
288 break;
289 case 0x01: /* CLKIN (clk_in) */
290 clkRate = GetExtClkFreq();
291 break;
292 case 0x02: /* Fro 1MHz (fro_1m) */
293 clkRate = GetFro1MFreq();
294 break;
295 default: /* = 0x03 = FRO 96 MHz (fro_hf) */
296 clkRate = GetFroHfFreq();
297 break;
298 }
299 break;
300 case 0x01: /* PLL0 clock (pll0_clk)*/
301 switch (SYSCON->PLL0CLKSEL & SYSCON_PLL0CLKSEL_SEL_MASK)
302 {
303 case 0x00: /* FRO 12 MHz (fro_12m) */
304 clkRate = GetFro12MFreq();
305 break;
306 case 0x01: /* CLKIN (clk_in) */
307 clkRate = GetExtClkFreq();
308 break;
309 case 0x02: /* Fro 1MHz (fro_1m) */
310 clkRate = GetFro1MFreq();
311 break;
312 case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */
313 clkRate = GetOsc32KFreq();
314 break;
315 default:
316 clkRate = 0UL;
317 break;
318 }
319 if (((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPLL_MASK) == 0UL) && ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_CLKEN_MASK) != 0UL) && ((PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_PLL0_MASK) == 0UL) && ((PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_PLL0_SSCG_MASK) == 0UL))
320 {
321 prediv = findPll0PreDiv();
322 postdiv = findPll0PostDiv();
323 /* Adjust input clock */
324 clkRate = clkRate / prediv;
325 /* MDEC used for rate */
326 workRate = (uint64_t)clkRate * (uint64_t)findPll0MMult();
327 clkRate = (uint32_t)(workRate / ((uint64_t)postdiv));
328 }
329 break;
330 case 0x02: /* PLL1 clock (pll1_clk)*/
331 switch (SYSCON->PLL1CLKSEL & SYSCON_PLL1CLKSEL_SEL_MASK)
332 {
333 case 0x00: /* FRO 12 MHz (fro_12m) */
334 clkRate = GetFro12MFreq();
335 break;
336 case 0x01: /* CLKIN (clk_in) */
337 clkRate = GetExtClkFreq();
338 break;
339 case 0x02: /* Fro 1MHz (fro_1m) */
340 clkRate = GetFro1MFreq();
341 break;
342 case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */
343 clkRate = GetOsc32KFreq();
344 break;
345 default:
346 clkRate = 0UL;
347 break;
348 }
349 if (((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPLL_MASK) == 0UL) && ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_CLKEN_MASK) != 0UL) && ((PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_PLL1_MASK) == 0UL))
350 {
351 /* PLL is not in bypass mode, get pre-divider, post-divider, and M divider */
352 prediv = findPll1PreDiv();
353 postdiv = findPll1PostDiv();
354 /* Adjust input clock */
355 clkRate = clkRate / prediv;
356
357 /* MDEC used for rate */
358 workRate1 = (uint64_t)clkRate * (uint64_t)findPll1MMult();
359 clkRate = (uint32_t)(workRate1 / ((uint64_t)postdiv));
360 }
361 break;
362 case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */
363 clkRate = GetOsc32KFreq();
364 break;
365 default:
366 clkRate = 0UL;
367 break;
368 }
369 SystemCoreClock = clkRate / ((SYSCON->AHBCLKDIV & 0xFFUL) + 1UL);
370}
371
372/* ----------------------------------------------------------------------------
373 -- SystemInitHook()
374 ---------------------------------------------------------------------------- */
375
376__attribute__ ((weak)) void SystemInitHook (void) {
377 /* Void implementation of the weak function. */
378}
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