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updated lesson #34
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Diff for: ‎lesson-34/nucleo-c031c6/README.txt

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This directory contains embedded code for the STM32 NUCLEO-C031C6
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board. This code is then used to build ET tests for this board.
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See also the examples/ directory, make_nucleo-l152re makefiles.

Diff for: ‎lesson-34/nucleo-c031c6/arm/startup_stm32c031xx.s

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;*****************************************************************************
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; @file startup_stm32c031xx.s for ARM-KEIL ARM assembler
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; @brief CMSIS Cortex-M4F Core Device Startup File for stm32c031xx
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; @version CMSIS 5.9.0
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; @date 1 Feb 2023
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;
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; Modified by Quantum Leaps:
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; - Added relocating of the Vector Table to free up the 256B region at 0x0
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; for NULL-pointer protection by the MPU.
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; - Modified all exception handlers to branch to assert_failed()
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; instead of locking up the CPU inside an endless loop.
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;
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; @description
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; Created from the CMSIS template for the specified device
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; Quantum Leaps, www.state-machine.com
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;
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; @note
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; The symbols Stack_Size and Heap_Size should be provided on the command-
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; line options to the assembler, for example as:
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; --pd "Stack_Size SETA 1024" --pd "Heap_Size SETA 0"
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;******************************************************************************
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; Allocate space for the stack.
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;
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AREA STACK, NOINIT, READWRITE, ALIGN=3
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__stack_base
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StackMem
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SPACE Stack_Size ; provided in command-line option, for example:
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; --pd "Stack_Size SETA 512"
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__stack_limit
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__initial_sp
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;******************************************************************************
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; Allocate space for the heap.
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;
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AREA HEAP, NOINIT, READWRITE, ALIGN=3
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__heap_base
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HeapMem
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SPACE Heap_Size ; provided in command-line option, for example:
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; --pd "Heap_Size SETA 0"
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__heap_limit
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; Indicate that the code in this file preserves 8-byte alignment of the stack.
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PRESERVE8
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;******************************************************************************
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; The vector table.
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;
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; Place code into the reset code section.
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AREA RESET, DATA, READONLY, ALIGN=8
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EXPORT __Vectors
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EXPORT __Vectors_End
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EXPORT __Vectors_Size
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__Vectors
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DCD __initial_sp ; Top of Stack
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DCD Reset_Handler ; Reset Handler
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DCD NMI_Handler ; NMI Handler
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DCD HardFault_Handler ; Hard Fault Handler
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DCD Default_Handler ; Reserved
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DCD Default_Handler ; Reserved
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DCD Default_Handler ; Reserved
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DCD Default_Handler ; Reserved
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DCD Default_Handler ; Reserved
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DCD Default_Handler ; Reserved
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DCD Default_Handler ; Reserved
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DCD SVC_Handler ; SVCall handler
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DCD DebugMon_Handler ; Debug Monitor handler
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DCD Default_Handler ; Reserved
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DCD PendSV_Handler ; PendSV handler
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DCD SysTick_Handler ; SysTick handler
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; IRQ handlers...
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DCD WWDG_IRQHandler ; [ 0] Window Watchdog
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DCD Reserved1_IRQHandler ; [ 1] Reserved
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DCD RTC_IRQHandler ; [ 2] RTC through EXTI Line
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DCD FLASH_IRQHandler ; [ 3] FLASH
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DCD RCC_IRQHandler ; [ 4] RCC
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DCD EXTI0_1_IRQHandler ; [ 5] EXTI Line 0 and 1
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DCD EXTI2_3_IRQHandler ; [ 6] EXTI Line 2 and 3
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DCD EXTI4_15_IRQHandler ; [ 7] EXTI Line 4 to 15
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DCD Reserved8_IRQHandler ; [ 8] Reserved
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DCD DMA1_Channel1_IRQHandler ; [ 9] DMA1 Channel 1
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DCD DMA1_Channel2_3_IRQHandler ; [10] DMA1 Channel 2 and Channel 3
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DCD DMAMUX1_IRQHandler ; [11] DMAMUX
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DCD ADC1_IRQHandler ; [12] ADC1
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DCD TIM1_BRK_UP_TRG_COM_IRQHandler ; [13] TIM1 Break, Update, Trigger and Commutation
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DCD TIM1_CC_IRQHandler ; [14] TIM1 Capture Compare
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DCD Reserved15_IRQHandler ; [15] Reserved
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DCD TIM3_IRQHandler ; [16] TIM3
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DCD Reserved17_IRQHandler ; [17] Reserved
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DCD Reserved18_IRQHandler ; [18] Reserved
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DCD TIM14_IRQHandler ; [19] TIM14
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DCD Reserved20_IRQHandler ; [20] Reserved
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DCD TIM16_IRQHandler ; [21] TIM16
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DCD TIM17_IRQHandler ; [22] TIM17
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DCD I2C1_IRQHandler ; [23] I2C1
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DCD Reserved24_IRQHandler ; [24] Reserved
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DCD SPI1_IRQHandler ; [25] SPI1
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DCD Reserved26_IRQHandler ; [26] Reserved
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DCD USART1_IRQHandler ; [27] USART1
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DCD USART2_IRQHandler ; [28] USART2
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DCD Reserved29_IRQHandler ; [29] Reserved
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DCD Reserved30_IRQHandler ; [30] Reserved
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DCD Reserved31_IRQHandler ; [31] Reserved
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__Vectors_End
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__Vectors_Size EQU __Vectors_End - __Vectors
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;******************************************************************************
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; This is the code for exception handlers.
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;
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AREA |.text|, CODE, READONLY
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;******************************************************************************
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; This is the code that gets called when the processor first starts execution
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; following a reset event.
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;
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Reset_Handler PROC
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EXPORT Reset_Handler [WEAK]
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IMPORT SystemInit
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IMPORT __main
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IMPORT assert_failed
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LDR r0,=SystemInit ; CMSIS system initialization
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BLX r0
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; Call the C library entry point that handles startup. This will copy
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; the .data section initializers from flash to SRAM and zero fill the
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; .bss section.
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; NOTE: The __main function clears the C stack as well
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LDR r0,=__main
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BX r0
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; __main calls the main() function, which should not return,
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; but just in case jump to assert_failed() if main returns.
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CPSID i ; disable all interrupts
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LDR r0,=str_EXIT
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_EXIT
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DCB "EXIT"
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ALIGN
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ENDP
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;******************************************************************************
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NMI_Handler PROC
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EXPORT NMI_Handler [WEAK]
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CPSID i ; disable all interrupts
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LDR r0,=str_NMI
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_NMI
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DCB "NMI"
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ALIGN
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ENDP
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;******************************************************************************
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HardFault_Handler PROC
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EXPORT HardFault_Handler [WEAK]
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CPSID i ; disable all interrupts
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LDR r0,=str_HardFault
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_HardFault
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DCB "HardFault"
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ALIGN
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ENDP
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;******************************************************************************
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;
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; Weak non-fault handlers...
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;
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;******************************************************************************
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SVC_Handler PROC
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EXPORT SVC_Handler [WEAK]
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CPSID i ; disable all interrupts
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LDR r0,=str_SVC
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_SVC
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DCB "SVC"
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ALIGN
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ENDP
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;******************************************************************************
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DebugMon_Handler PROC
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EXPORT DebugMon_Handler [WEAK]
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CPSID i ; disable all interrupts
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LDR r0,=str_DebugMon
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_DebugMon
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DCB "DebugMon"
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ALIGN
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ENDP
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;******************************************************************************
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PendSV_Handler PROC
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EXPORT PendSV_Handler [WEAK]
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CPSID i ; disable all interrupts
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LDR r0,=str_PendSV
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_PendSV
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DCB "PendSV"
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ALIGN
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ENDP
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;******************************************************************************
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SysTick_Handler PROC
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EXPORT SysTick_Handler [WEAK]
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CPSID i ; disable all interrupts
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LDR r0,=str_SysTick
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_SysTick
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DCB "SysTick"
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ALIGN
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ENDP
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;******************************************************************************
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Default_Handler PROC
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EXPORT WWDG_IRQHandler [WEAK]
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EXPORT RTC_IRQHandler [WEAK]
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EXPORT FLASH_IRQHandler [WEAK]
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EXPORT RCC_IRQHandler [WEAK]
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EXPORT EXTI0_1_IRQHandler [WEAK]
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EXPORT EXTI2_3_IRQHandler [WEAK]
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EXPORT EXTI4_15_IRQHandler [WEAK]
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EXPORT DMA1_Channel1_IRQHandler [WEAK]
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EXPORT DMA1_Channel2_3_IRQHandler [WEAK]
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EXPORT DMAMUX1_IRQHandler [WEAK]
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EXPORT ADC1_IRQHandler [WEAK]
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EXPORT TIM1_BRK_UP_TRG_COM_IRQHandler [WEAK]
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EXPORT TIM1_CC_IRQHandler [WEAK]
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EXPORT TIM3_IRQHandler [WEAK]
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EXPORT TIM14_IRQHandler [WEAK]
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EXPORT TIM16_IRQHandler [WEAK]
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EXPORT TIM17_IRQHandler [WEAK]
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EXPORT I2C1_IRQHandler [WEAK]
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EXPORT SPI1_IRQHandler [WEAK]
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EXPORT USART1_IRQHandler [WEAK]
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EXPORT USART2_IRQHandler [WEAK]
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EXPORT Reserved1_IRQHandler [WEAK]
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EXPORT Reserved8_IRQHandler [WEAK]
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EXPORT Reserved15_IRQHandler [WEAK]
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EXPORT Reserved17_IRQHandler [WEAK]
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EXPORT Reserved18_IRQHandler [WEAK]
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EXPORT Reserved20_IRQHandler [WEAK]
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EXPORT Reserved24_IRQHandler [WEAK]
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EXPORT Reserved26_IRQHandler [WEAK]
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EXPORT Reserved29_IRQHandler [WEAK]
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EXPORT Reserved30_IRQHandler [WEAK]
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EXPORT Reserved31_IRQHandler [WEAK]
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WWDG_IRQHandler
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RTC_IRQHandler
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FLASH_IRQHandler
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RCC_IRQHandler
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EXTI0_1_IRQHandler
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EXTI2_3_IRQHandler
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EXTI4_15_IRQHandler
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DMA1_Channel1_IRQHandler
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DMA1_Channel2_3_IRQHandler
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DMAMUX1_IRQHandler
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ADC1_IRQHandler
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TIM1_BRK_UP_TRG_COM_IRQHandler
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TIM1_CC_IRQHandler
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TIM3_IRQHandler
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TIM14_IRQHandler
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TIM16_IRQHandler
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TIM17_IRQHandler
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I2C1_IRQHandler
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SPI1_IRQHandler
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USART1_IRQHandler
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USART2_IRQHandler
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Reserved1_IRQHandler
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Reserved8_IRQHandler
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Reserved15_IRQHandler
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Reserved17_IRQHandler
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Reserved18_IRQHandler
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Reserved20_IRQHandler
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Reserved24_IRQHandler
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Reserved26_IRQHandler
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Reserved29_IRQHandler
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Reserved30_IRQHandler
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Reserved31_IRQHandler
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CPSID i ; disable all interrupts
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LDR r0,=str_Undefined
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MOVS r1,#1
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LDR r2,=__initial_sp ; re-set the SP in case of stack overflow
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MOV sp,r2
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LDR r2,=assert_failed
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BX r2
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str_Undefined
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DCB "Undefined"
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ALIGN
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ENDP
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ALIGN ; make sure the end of this section is aligned
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;******************************************************************************
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; The function expected of the C library startup code for defining the stack
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; and heap memory locations. For the C library version of the startup code,
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; provide this function so that the C library initialization code can find out
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; the location of the stack and heap.
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;
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IF :DEF: __MICROLIB
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EXPORT __initial_sp
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EXPORT __stack_limit
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EXPORT __heap_base
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EXPORT __heap_limit
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ELSE
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IMPORT __use_two_region_memory
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EXPORT __user_initial_stackheap
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__user_initial_stackheap PROC
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LDR R0, =__heap_base
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LDR R1, =__stack_limit
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LDR R2, =__heap_limit
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LDR R3, =__stack_base
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BX LR
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ENDP
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ENDIF
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ALIGN ; make sure the end of this section is aligned
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END ; end of module
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