diff options
Diffstat (limited to 'os/hal/ports/KINETIS/K20x/hal_lld.c')
| -rw-r--r-- | os/hal/ports/KINETIS/K20x/hal_lld.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/os/hal/ports/KINETIS/K20x/hal_lld.c b/os/hal/ports/KINETIS/K20x/hal_lld.c new file mode 100644 index 0000000..1e10241 --- /dev/null +++ b/os/hal/ports/KINETIS/K20x/hal_lld.c @@ -0,0 +1,204 @@ +/*
+ ChibiOS - Copyright (C) 2014-2015 Fabio Utzig
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * @file templates/hal_lld.c
+ * @brief HAL Driver subsystem low level driver source template.
+ *
+ * @addtogroup HAL
+ * @{
+ */
+
+#include "hal.h"
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+#ifdef __CC_ARM
+__attribute__ ((section(".ARM.__at_0x400")))
+#else
+__attribute__ ((used, section(".cfmconfig")))
+#endif
+const uint8_t _cfm[0x10] = {
+ 0xFF, /* NV_BACKKEY3: KEY=0xFF */
+ 0xFF, /* NV_BACKKEY2: KEY=0xFF */
+ 0xFF, /* NV_BACKKEY1: KEY=0xFF */
+ 0xFF, /* NV_BACKKEY0: KEY=0xFF */
+ 0xFF, /* NV_BACKKEY7: KEY=0xFF */
+ 0xFF, /* NV_BACKKEY6: KEY=0xFF */
+ 0xFF, /* NV_BACKKEY5: KEY=0xFF */
+ 0xFF, /* NV_BACKKEY4: KEY=0xFF */
+ 0xFF, /* NV_FPROT3: PROT=0xFF */
+ 0xFF, /* NV_FPROT2: PROT=0xFF */
+ 0xFF, /* NV_FPROT1: PROT=0xFF */
+ 0xFF, /* NV_FPROT0: PROT=0xFF */
+ 0x7E, /* NV_FSEC: KEYEN=1,MEEN=3,FSLACC=3,SEC=2 */
+ 0xFF, /* NV_FOPT: ??=1,??=1,FAST_INIT=1,LPBOOT1=1,RESET_PIN_CFG=1,
+ NMI_DIS=1,EZPORT_DIS=1,LPBOOT0=1 */
+ 0xFF,
+ 0xFF
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level HAL driver initialization.
+ * @todo Use a macro to define the system clock frequency.
+ *
+ * @notapi
+ */
+void hal_lld_init(void) {
+
+}
+
+/**
+ * @brief MK20D5 clock initialization.
+ * @note All the involved constants come from the file @p board.h.
+ * @note This function is meant to be invoked early during the system
+ * initialization, it is usually invoked from the file
+ * @p board.c.
+ * @todo This function needs to be more generic.
+ *
+ * @special
+ */
+void mk20d50_clock_init(void) {
+#if !KINETIS_NO_INIT
+
+#if KINETIS_MCG_MODE == KINETIS_MCG_MODE_PEE
+ uint32_t ratio, frdiv;
+ uint32_t ratios[] = { 32, 64, 128, 256, 512, 1024, 1280, 1536 };
+ int ratio_quantity = sizeof(ratios) / sizeof(ratios[0]);
+ int i;
+#endif /* KINETIS_MCG_MODE == KINETIS_MCG_MODE_PEE */
+
+ /* Disable the watchdog */
+ WDOG->UNLOCK = 0xC520;
+ WDOG->UNLOCK = 0xD928;
+ WDOG->STCTRLH &= ~WDOG_STCTRLH_WDOGEN;
+
+ SIM->SCGC5 |= SIM_SCGC5_PORTA |
+ SIM_SCGC5_PORTB |
+ SIM_SCGC5_PORTC |
+ SIM_SCGC5_PORTD |
+ SIM_SCGC5_PORTE;
+
+#if KINETIS_MCG_MODE == KINETIS_MCG_MODE_FEI
+
+ /* Configure FEI mode */
+ MCG->C4 = MCG_C4_DRST_DRS(KINETIS_MCG_FLL_DRS) |
+ (KINETIS_MCG_FLL_DMX32 ? MCG_C4_DMX32 : 0);
+
+#endif /* KINETIS_MCG_MODE == KINETIS_MCG_MODE_FEI */
+
+#if KINETIS_MCG_MODE == KINETIS_MCG_MODE_PEE
+
+ /* EXTAL0 and XTAL0 */
+ PORTA->PCR[18] = 0;
+ PORTA->PCR[19] = 0;
+
+ /*
+ * Start in FEI mode
+ */
+
+ /* Disable capacitors for crystal */
+ OSC->CR = 0;
+
+ /* TODO: need to add more flexible calculation, specially regarding
+ * divisors which may not be available depending on the XTAL
+ * frequency, which would required other registers to be modified.
+ */
+ /* Enable OSC, low power mode */
+ MCG->C2 = MCG_C2_LOCRE0 | MCG_C2_EREFS0;
+ if (KINETIS_XTAL_FREQUENCY > 8000000)
+ MCG->C2 |= MCG_C2_RANGE0(2);
+ else
+ MCG->C2 |= MCG_C2_RANGE0(1);
+
+ frdiv = 7;
+ ratio = KINETIS_XTAL_FREQUENCY / 31250;
+ for (i = 0; i < ratio_quantity; ++i) {
+ if (ratio == ratios[i]) {
+ frdiv = i;
+ break;
+ }
+ }
+
+ /* Switch to crystal as clock source, FLL input of 31.25 KHz */
+ MCG->C1 = MCG_C1_CLKS(2) | MCG_C1_FRDIV(frdiv);
+
+ /* Wait for crystal oscillator to begin */
+ while (!(MCG->S & MCG_S_OSCINIT0));
+
+ /* Wait for the FLL to use the oscillator */
+ while (MCG->S & MCG_S_IREFST);
+
+ /* Wait for the MCGOUTCLK to use the oscillator */
+ while ((MCG->S & MCG_S_CLKST_MASK) != MCG_S_CLKST(2));
+
+ /*
+ * Now in FBE mode
+ */
+
+ /* Config PLL input for 2 MHz */
+ MCG->C5 = MCG_C5_PRDIV0((KINETIS_XTAL_FREQUENCY / 2000000) - 1);
+
+ /* Config PLL for 96 MHz output */
+ MCG->C6 = MCG_C6_PLLS | MCG_C6_VDIV0(0);
+
+ /* Wait for PLL to start using crystal as its input */
+ while (!(MCG->S & MCG_S_PLLST));
+
+ /* Wait for PLL to lock */
+ while (!(MCG->S & MCG_S_LOCK0));
+
+ /*
+ * Now in PBE mode
+ */
+
+ /* Switch to PLL as clock source */
+ MCG->C1 = MCG_C1_CLKS(0);
+
+ /* Wait for PLL clock to be used */
+ while ((MCG->S & MCG_S_CLKST_MASK) != MCG_S_CLKST_PLL);
+
+ /*
+ * Now in PEE mode
+ */
+#endif /* KINETIS_MCG_MODE == KINETIS_MCG_MODE_PEE */
+
+#endif /* !KINETIS_NO_INIT */
+}
+
+/** @} */
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