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cde8ac6093
The NXP QN908x CPU family is a Cortex-M4F CPU with integrated USB, Bluetooth Low Energy and in some variants NFC. This patch implements the first steps for having support for this CPU. While the QN908x can be considered the successor of similar chips from NXP like the KW41Z when looking at the feature set, the internal architecture, boot image format and CPU peripherals don't match those in the Kinetis line. Therefore, this patch creates a new directory for just the QN908x chip under cpu/qn908x. The minimal set of peripherals are implemented in this patch to allow the device to boot and enable a GPIO: the gpio and wdt peripheral modules only. The wdt driver is required to boot and disable the wdt. On reset, the wdt is disabled by the chip, however the QN908x bootloader stored in the internal ROM enables the wdt and sets a timer to reboot after 10 seconds, therefore it is needed to disable the wdt in RIOT OS soon after booting. This patch sets it up such that when no periph_wdt module is used the Watchdog is disabled, but if the periph_wdt is used it must be configured (initialized) within the first 10 seconds. Tests performed: Defined a custom board for this CPU and compiled a simple application that blinks some LEDs. Manually tested with periph_wdt and with periph_wdt_cb as well.
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/*
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* Copyright (C) 2020 iosabi
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_qn908x
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* @{
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*
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* @file
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* @brief CMSIS system setup wrapper functions for NXP QN908x
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*
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* The system_QN908XC.h header is used by several vendor headers (including
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* QN908XC.h which defines all the registers and some drivers). The
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* system_QN908XC.c file in the vendor SDK implements the system initialization
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* via the SystemInit() function and provides the current system clock
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* frequency, however part of the system initialization is more appropriate in
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* the board module (in `board_init`) or in the cpu module (in `cpu_init`) and
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* some values like the XTAL or BUCK configuration depend on the actual board
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* used while in the SDK code they are set to the QN9080DK developer module.
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* Because of this we can't include that source file here.
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*
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* This file implements the minimum required to make some of the drivers in the
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* vendor code work by providing the global SystemCoreClock variable and a
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* function to update its value with the current clock configuration.
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*
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* @author iosabi <iosabi@protonmail.com>
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*
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* @}
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*/
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#include <stdint.h>
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#include "cpu.h"
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#include "vendor/drivers/fsl_clock.h"
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uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
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void SystemInit(void)
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{
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/* Do nothing here. The system initialization is done in board_init() and
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* cpu_init() as needed. This function shouldn't be called anyway.
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*/
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}
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void SystemCoreClockUpdate(void)
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{
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SystemCoreClock = CLOCK_GetFreq(kCLOCK_CoreSysClk);
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}
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