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1374c701ab
This change is required to sucessfully use PA13/PA14 for UART. Otherwise they function as SWDIO/SWCLK. Relevant excerpt from the reference manual (translated): The initial state of PA13, PA14, PA15, PB3, and PB4 ports is that the JTAG/SWD function is valid after reset. When configuring FSEL[5:0] to select the function, you need to write 0 to the corresponding bit of the register PSPCR to invalidate the JTAG/SWD function. Signed-off-by: Boris-Chengbiao Zhou <bobo1239@web.de>
35 lines
978 B
C
35 lines
978 B
C
// Code to setup clocks on Huada HC32F460
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//
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// Copyright (C) 2022 Steven Gotthardt <gotthardt@gmail.com>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include "autoconf.h" // CONFIG_MACH_AVR
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#include "sched.h"
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#include "system_hc32f460.h"
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#include "hc32f460_gpio.h"
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/****************************************************************
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* Startup
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****************************************************************/
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// Main entry point - called from armcm_boot.c:ResetHandler()
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void __attribute__((noreturn))
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armcm_main(void)
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{
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// sets the system clock speed variable for library use
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SystemInit();
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// disable JTAG/SWD on pins PA13, PA14, PA15, PB3, PB4
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// SWD still works until the relevant pins are reconfigured. Proprietary
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// flash program (XHSC ISP) must be used to reflash afterwards.
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PORT_DebugPortSetting(ALL_DBG_PIN, Disable);
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// manage the system
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sched_main();
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// never get here
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for (;;) ;
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}
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