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/*
SPC5 HAL - Copyright (C) 2013 STMicroelectronics
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 SPC564Axx/hal_lld.c
* @brief SPC564Axx HAL subsystem low level driver source.
*
* @addtogroup HAL
* @{
*/
#include "ch.h"
#include "hal.h"
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level HAL driver initialization.
*
* @notapi
*/
void hal_lld_init(void) {
extern void _vectors(void);
uint32_t n;
/* FLASH wait states and prefetching setup.*/
FLASH_A.BIUCR.R = SPC5_FLASH_BIUCR | SPC5_FLASH_WS;
FLASH_A.BIUCR2.R = 0;
FLASH_B.BIUCR.R = SPC5_FLASH_BIUCR | SPC5_FLASH_WS;
FLASH_B.BIUCR2.R = 0;
/* The SRAM is parked on the load/store port, for some unknown reason it
is defaulted on the instructions port and this kills performance.*/
XBAR.SGPCR2.B.PARK = 1; /* RAM slave on load/store port.*/
/* The DMA priority is placed above the CPU priority in order to not
starve I/O activities while the CPU is executing tight loops (FLASH
and SRAM slave ports only).*/
XBAR.MPR0.R = 0x34000021; /* Flash slave port priorities:
eDMA (4): 0 (highest)
Core Instructions (0): 1
Core Data (1): 2
EBI (7): 3
Flexray (6): 4 */
XBAR.MPR2.R = 0x34000021; /* SRAM slave port priorities:
eDMA (4): 0 (highest)
Core Instructions (0): 1
Core Data (1): 2
EBI (7): 3
FlexRay (6): 4 */
/* Downcounter timer initialized for system tick use, TB enabled for debug
and measurements.*/
n = SPC5_SYSCLK / CH_FREQUENCY;
asm volatile ("li %%r3, 0 \t\n"
"mtspr 284, %%r3 \t\n" /* Clear TBL register. */
"mtspr 285, %%r3 \t\n" /* Clear TBU register. */
"mtspr 22, %[n] \t\n" /* Init. DEC register. */
"mtspr 54, %[n] \t\n" /* Init. DECAR register.*/
"li %%r3, 0x4000 \t\n" /* TBEN bit. */
"mtspr 1008, %%r3 \t\n" /* HID0 register. */
"lis %%r3, 0x0440 \t\n" /* DIE ARE bits. */
"mtspr 340, %%r3" /* TCR register. */
: : [n] "r" (n) : "r3");
/* INTC initialization, software vector mode, 4 bytes vectors, starting
at priority 0.*/
INTC.MCR.R = 0;
INTC.CPR.R = 0;
INTC.IACKR.R = (uint32_t)_vectors;
}
/**
* @brief SPC563 clocks and PLL initialization.
* @note All the involved constants come from the file @p board.h and
* @p hal_lld.h
* @note This function must be invoked only after the system reset.
*
* @special
*/
void spc_clock_init(void) {
#if !SPC5_NO_INIT
/* PLL activation.*/
FMPLL.ESYNCR1.B.EMODE = 1; /* Enhanced mode on. */
FMPLL.ESYNCR1.B.CLKCFG &= 1; /* Bypass mode, PLL off.*/
#if !SPC5_CLK_BYPASS
FMPLL.ESYNCR1.B.CLKCFG |= 2; /* PLL on. */
FMPLL.ESYNCR1.B.EPREDIV = SPC5_CLK_PREDIV;
FMPLL.ESYNCR1.B.EMFD = SPC5_CLK_MFD;
FMPLL.ESYNCR2.B.ERFD = SPC5_CLK_RFD;
while (!FMPLL.SYNSR.B.LOCK)
;
FMPLL.ESYNCR1.B.CLKCFG |= 4; /* Clock from the PLL. */
#endif /* !SPC5_CLK_BYPASS */
#endif /* !SPC5_NO_INIT */
}
/** @} */
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