.gitignore

@@ -1 +1 @@
-build/
+_build/

.vscode/launch.json

@@ -6,7 +6,7 @@
             "type": "cppdbg",
             "request": "launch",
             "args": [],
-            "program": "${workspaceFolder}/build/firmware.elf",
+            "program": "${workspaceFolder}/_build/firmware.elf",
             "stopAtEntry": true,
             "cwd": "${workspaceRoot}",
             "environment": [],
@@ -43,7 +43,7 @@
                 },
                 {
                     "description": "Load executable into debugger.",
-                    "text": "file ${workspaceFolder}/build/firmware.elf",
+                    "text": "file ${workspaceFolder}/_build/firmware.elf",
                     "ignoreFailures": false
                 },
                 {

Core/main.cc

@@ -16,7 +16,7 @@ int main(void)
 {
     char tx_buf[] = "\r\rProgram: UART bridge\r\n\n Receive on uart2 and transmit it on uart 1\r\n";
     uint8_t rec;
-    uart1.sync_send((const uint8_t *)tx_buf, strlen(tx_buf));
+        uart1.sync_send((const uint8_t *)tx_buf, strlen(tx_buf));
 
     while(true) {
         if(uart2.sync_receive(&rec)) {

Makefile

@@ -3,12 +3,19 @@ TARGET = firmware
 DEBUG = 1
 OPT = -O0
 
-BUILD_DIR = build
+BUILD_DIR = _build
 
-SRC_DIRS := $(shell find src -type d)
+CC_SOURCES = \
-CC_SOURCES = $(foreach folder, $(SRC_DIRS), $(wildcard $(folder)/*.cc))
+Core/main.cc \
-C_SOURCES = $(foreach folder, $(SRC_DIRS), $(wildcard $(folder)/*.c))
+platform/stm32g0xx/Gpio.cc \
-ASM_SOURCES = $(foreach folder, $(SRC_DIRS), $(wildcard $(folder)/*.s))
+platform/stm32g0xx/Uart.cc \
+platform/stm32g0xx/IndependentWatchdog.cc \
+platform/stm32g0xx/low_level_interrupt.cc
+
+C_SOURCES = \
+platform/stm32g0xx/system_stm32g0xx.c \
+platform/stm32g0xx/syscalls.c \
+platform/stm32g0xx/sysmem.c \
 
 PREFIX = arm-none-eabi-
 CC = $(PREFIX)gcc
@@ -23,11 +30,31 @@ BIN = $(CP) -O binary -S
 CPU = -mcpu=cortex-m0plus
 MCU = $(CPU) -mthumb $(FPU) $(FLOAT-ABI)
 
+ifeq "$(SOC)" "stm32g071"
+
+C_DEFS = -DSTM32G071xx
+LDSCRIPT = platform/stm32g0xx/STM32G071RBTX_FLASH.ld
+ASM_SOURCES = platform/stm32g0xx/startup_stm32g071rbtx.s
+
+else
+ifeq "$(SOC)" "stm32g031"
+
 C_DEFS = -DSTM32G031xx
-LDSCRIPT = src/platform/stm32g0xx/STM32G031Y8YX_FLASH.ld
+LDSCRIPT = platform/stm32g0xx/STM32G031Y8YX_FLASH.ld
+ASM_SOURCES = platform/stm32g0xx/startup_stm32g031y8yx.s
+
+endif
+endif
+
+C_INCLUDES = \
+-I. \
+-ICore \
+-Iarch/CMSIS/Device/ST/STM32G0xx/Include \
+-Iarch/CMSIS/Include \
+-Iplatform/stm32g0xx
 
 ASFLAGS = $(MCU) $(AS_DEFS) $(AS_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
-CFLAGS = $(MCU) $(C_DEFS) $(addprefix -I,$(SRC_DIRS)) $(OPT) -Wall -fdata-sections -ffunction-sections
+CFLAGS = $(MCU) $(C_DEFS) $(C_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
 
 ifeq ($(DEBUG), 1)
 CFLAGS += -ggdb3

platform/stm32g0xx/STM32G071RBTX_FLASH.ld

@@ -0,0 +1,177 @@
+/**
+ ******************************************************************************
+ * @file      LinkerScript.ld
+ * @author    Auto-generated by STM32CubeIDE
+ *  Abstract    : Linker script for NUCLEO-G071RB Board embedding STM32G071RBTx Device from stm32g0 series
+ *                      128Kbytes FLASH
+ *                      36Kbytes RAM
+ *
+ *            Set heap size, stack size and stack location according
+ *            to application requirements.
+ *
+ *            Set memory bank area and size if external memory is used
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+ * All rights reserved.</center></h2>
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ *                        opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+/* Entry Point */
+ENTRY(Reset_Handler)
+
+/* Highest address of the user mode stack */
+_estack = ORIGIN(RAM) + LENGTH(RAM);	/* end of "RAM" Ram type memory */
+
+_Min_Heap_Size = 0x200 ;	/* required amount of heap  */
+_Min_Stack_Size = 0x400 ;	/* required amount of stack */
+
+/* Memories definition */
+MEMORY
+{
+  RAM    (xrw)    : ORIGIN = 0x20000000,   LENGTH = 36K
+  FLASH    (rx)    : ORIGIN = 0x8000000,   LENGTH = 128K
+}
+
+/* Sections */
+SECTIONS
+{
+  /* The startup code into "FLASH" Rom type memory */
+  .isr_vector :
+  {
+    . = ALIGN(4);
+    KEEP(*(.isr_vector)) /* Startup code */
+    . = ALIGN(4);
+  } >FLASH
+
+  /* The program code and other data into "FLASH" Rom type memory */
+  .text :
+  {
+    . = ALIGN(4);
+    *(.text)           /* .text sections (code) */
+    *(.text*)          /* .text* sections (code) */
+    *(.glue_7)         /* glue arm to thumb code */
+    *(.glue_7t)        /* glue thumb to arm code */
+    *(.eh_frame)
+
+    KEEP (*(.init))
+    KEEP (*(.fini))
+
+    . = ALIGN(4);
+    _etext = .;        /* define a global symbols at end of code */
+  } >FLASH
+
+  /* Constant data into "FLASH" Rom type memory */
+  .rodata :
+  {
+    . = ALIGN(4);
+    *(.rodata)         /* .rodata sections (constants, strings, etc.) */
+    *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    . = ALIGN(4);
+  } >FLASH
+
+  .ARM.extab   : {
+    . = ALIGN(4);
+    *(.ARM.extab* .gnu.linkonce.armextab.*)
+    . = ALIGN(4);
+  } >FLASH
+
+  .ARM : {
+    . = ALIGN(4);
+    __exidx_start = .;
+    *(.ARM.exidx*)
+    __exidx_end = .;
+    . = ALIGN(4);
+  } >FLASH
+
+  .preinit_array     :
+  {
+    . = ALIGN(4);
+    PROVIDE_HIDDEN (__preinit_array_start = .);
+    KEEP (*(.preinit_array*))
+    PROVIDE_HIDDEN (__preinit_array_end = .);
+    . = ALIGN(4);
+  } >FLASH
+
+  .init_array :
+  {
+    . = ALIGN(4);
+    PROVIDE_HIDDEN (__init_array_start = .);
+    KEEP (*(SORT(.init_array.*)))
+    KEEP (*(.init_array*))
+    PROVIDE_HIDDEN (__init_array_end = .);
+    . = ALIGN(4);
+  } >FLASH
+
+  .fini_array :
+  {
+    . = ALIGN(4);
+    PROVIDE_HIDDEN (__fini_array_start = .);
+    KEEP (*(SORT(.fini_array.*)))
+    KEEP (*(.fini_array*))
+    PROVIDE_HIDDEN (__fini_array_end = .);
+    . = ALIGN(4);
+  } >FLASH
+
+  /* Used by the startup to initialize data */
+  _sidata = LOADADDR(.data);
+
+  /* Initialized data sections into "RAM" Ram type memory */
+  .data :
+  {
+    . = ALIGN(4);
+    _sdata = .;        /* create a global symbol at data start */
+    *(.data)           /* .data sections */
+    *(.data*)          /* .data* sections */
+    *(.RamFunc)        /* .RamFunc sections */
+    *(.RamFunc*)       /* .RamFunc* sections */
+
+    . = ALIGN(4);
+    _edata = .;        /* define a global symbol at data end */
+
+  } >RAM AT> FLASH
+
+  /* Uninitialized data section into "RAM" Ram type memory */
+  . = ALIGN(4);
+  .bss :
+  {
+    /* This is used by the startup in order to initialize the .bss section */
+    _sbss = .;         /* define a global symbol at bss start */
+    __bss_start__ = _sbss;
+    *(.bss)
+    *(.bss*)
+    *(COMMON)
+
+    . = ALIGN(4);
+    _ebss = .;         /* define a global symbol at bss end */
+    __bss_end__ = _ebss;
+  } >RAM
+
+  /* User_heap_stack section, used to check that there is enough "RAM" Ram  type memory left */
+  ._user_heap_stack :
+  {
+    . = ALIGN(8);
+    PROVIDE ( end = . );
+    PROVIDE ( _end = . );
+    . = . + _Min_Heap_Size;
+    . = . + _Min_Stack_Size;
+    . = ALIGN(8);
+  } >RAM
+
+  /* Remove information from the compiler libraries */
+  /DISCARD/ :
+  {
+    libc.a ( * )
+    libm.a ( * )
+    libgcc.a ( * )
+  }
+
+  .ARM.attributes 0 : { *(.ARM.attributes) }
+}

platform/stm32g0xx/startup_stm32g071rbtx.s

@@ -0,0 +1,299 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32g071xx.s
+  * @author    MCD Application Team
+  * @brief     STM32G071xx devices vector table GCC toolchain.
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M0+ processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2018 STMicroelectronics. All rights reserved.
+  *
+  * This software component is licensed by ST under 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:
+  *                        opensource.org/licenses/Apache-2.0
+  *
+  ******************************************************************************
+  */
+
+.syntax unified
+.cpu cortex-m0plus
+.fpu softvfp
+.thumb
+
+.global g_pfnVectors
+.global Default_Handler
+
+/* start address for the initialization values of the .data section.
+defined in linker script */
+.word _sidata
+/* start address for the .data section. defined in linker script */
+.word _sdata
+/* end address for the .data section. defined in linker script */
+.word _edata
+/* start address for the .bss section. defined in linker script */
+.word _sbss
+/* end address for the .bss section. defined in linker script */
+.word _ebss
+
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called.
+ * @param  None
+ * @retval None
+*/
+
+  .section .text.Reset_Handler
+  .weak Reset_Handler
+  .type Reset_Handler, %function
+Reset_Handler:
+  ldr   r0, =_estack
+  mov   sp, r0          /* set stack pointer */
+
+/* Call the clock system initialization function.*/
+  bl  SystemInit
+
+/* Copy the data segment initializers from flash to SRAM */
+  ldr r0, =_sdata
+  ldr r1, =_edata
+  ldr r2, =_sidata
+  movs r3, #0
+  b LoopCopyDataInit
+
+CopyDataInit:
+  ldr r4, [r2, r3]
+  str r4, [r0, r3]
+  adds r3, r3, #4
+
+LoopCopyDataInit:
+  adds r4, r0, r3
+  cmp r4, r1
+  bcc CopyDataInit
+
+/* Zero fill the bss segment. */
+  ldr r2, =_sbss
+  ldr r4, =_ebss
+  movs r3, #0
+  b LoopFillZerobss
+
+FillZerobss:
+  str  r3, [r2]
+  adds r2, r2, #4
+
+LoopFillZerobss:
+  cmp r2, r4
+  bcc FillZerobss
+
+/* Call static constructors */
+  bl __libc_init_array
+  @ bl system_early_init
+/* Call the application s entry point.*/
+  bl main
+
+LoopForever:
+  b LoopForever
+
+.size Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ *
+ * @param  None
+ * @retval None
+*/
+  .section .text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+  b Infinite_Loop
+  .size Default_Handler, .-Default_Handler
+
+/******************************************************************************
+*
+* The minimal vector table for a Cortex M0.  Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+*
+******************************************************************************/
+  .section .isr_vector,"a",%progbits
+  .type g_pfnVectors, %object
+  .size g_pfnVectors, .-g_pfnVectors
+
+g_pfnVectors:
+  .word _estack
+  .word Reset_Handler
+  .word NMI_Handler
+  .word HardFault_Handler
+  .word 0
+  .word 0
+  .word 0
+  .word 0
+  .word 0
+  .word 0
+  .word 0
+  .word SVC_Handler
+  .word 0
+  .word 0
+  .word PendSV_Handler
+  .word SysTick_Handler
+  .word WWDG_IRQHandler                   /* Window WatchDog              */
+  .word PVD_IRQHandler                    /* PVD through EXTI Line detect */
+  .word RTC_TAMP_IRQHandler               /* RTC through the EXTI line    */
+  .word FLASH_IRQHandler                  /* FLASH                        */
+  .word RCC_IRQHandler                    /* RCC                          */
+  .word EXTI0_1_IRQHandler                /* EXTI Line 0 and 1            */
+  .word EXTI2_3_IRQHandler                /* EXTI Line 2 and 3            */
+  .word EXTI4_15_IRQHandler               /* EXTI Line 4 to 15            */
+  .word UCPD1_2_IRQHandler                /* UCPD1, UCPD2                 */
+  .word DMA1_Channel1_IRQHandler          /* DMA1 Channel 1               */
+  .word DMA1_Channel2_3_IRQHandler        /* DMA1 Channel 2 and Channel 3 */
+  .word DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler /* DMA1 Channel 4 to Channel 7, DMAMUX1 overrun */
+  .word ADC1_COMP_IRQHandler              /* ADC1, COMP1 and COMP2         */
+  .word TIM1_BRK_UP_TRG_COM_IRQHandler    /* TIM1 Break, Update, Trigger and Commutation */
+  .word TIM1_CC_IRQHandler                /* TIM1 Capture Compare         */
+  .word TIM2_IRQHandler                   /* TIM2                         */
+  .word TIM3_IRQHandler                   /* TIM3                         */
+  .word TIM6_DAC_LPTIM1_IRQHandler        /* TIM6, DAC and LPTIM1         */
+  .word TIM7_LPTIM2_IRQHandler            /* TIM7 and LPTIM2              */
+  .word TIM14_IRQHandler                  /* TIM14                        */
+  .word TIM15_IRQHandler                  /* TIM15                        */
+  .word TIM16_IRQHandler                  /* TIM16                        */
+  .word TIM17_IRQHandler                  /* TIM17                        */
+  .word I2C1_IRQHandler                   /* I2C1                         */
+  .word I2C2_IRQHandler                   /* I2C2                         */
+  .word SPI1_IRQHandler                   /* SPI1                         */
+  .word SPI2_IRQHandler                   /* SPI2                         */
+  .word USART1_IRQHandler                 /* USART1                       */
+  .word USART2_IRQHandler                 /* USART2                       */
+  .word USART3_4_LPUART1_IRQHandler       /* USART3, USART4 and LPUART1   */
+  .word CEC_IRQHandler                    /* CEC                          */
+
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler.
+* As they are weak aliases, any function with the same name will override
+* this definition.
+*
+*******************************************************************************/
+
+  .weak      NMI_Handler
+  .thumb_set NMI_Handler,Default_Handler
+
+  .weak      HardFault_Handler
+  .thumb_set HardFault_Handler,Default_Handler
+
+  .weak      SVC_Handler
+  .thumb_set SVC_Handler,Default_Handler
+
+  .weak      PendSV_Handler
+  .thumb_set PendSV_Handler,Default_Handler
+
+  .weak      SysTick_Handler
+  .thumb_set SysTick_Handler,Default_Handler
+
+  .weak      WWDG_IRQHandler
+  .thumb_set WWDG_IRQHandler,Default_Handler
+
+  .weak      PVD_IRQHandler
+  .thumb_set PVD_IRQHandler,Default_Handler
+
+  .weak      RTC_TAMP_IRQHandler
+  .thumb_set RTC_TAMP_IRQHandler,Default_Handler
+
+  .weak      FLASH_IRQHandler
+  .thumb_set FLASH_IRQHandler,Default_Handler
+
+  .weak      RCC_IRQHandler
+  .thumb_set RCC_IRQHandler,Default_Handler
+
+  .weak      EXTI0_1_IRQHandler
+  .thumb_set EXTI0_1_IRQHandler,Default_Handler
+
+  .weak      EXTI2_3_IRQHandler
+  .thumb_set EXTI2_3_IRQHandler,Default_Handler
+
+  .weak      EXTI4_15_IRQHandler
+  .thumb_set EXTI4_15_IRQHandler,Default_Handler
+
+  .weak      UCPD1_2_IRQHandler
+  .thumb_set UCPD1_2_IRQHandler,Default_Handler
+
+  .weak      DMA1_Channel1_IRQHandler
+  .thumb_set DMA1_Channel1_IRQHandler,Default_Handler
+
+  .weak      DMA1_Channel2_3_IRQHandler
+  .thumb_set DMA1_Channel2_3_IRQHandler,Default_Handler
+
+  .weak      DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler
+  .thumb_set DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler,Default_Handler
+
+  .weak      ADC1_COMP_IRQHandler
+  .thumb_set ADC1_COMP_IRQHandler,Default_Handler
+
+  .weak      TIM1_BRK_UP_TRG_COM_IRQHandler
+  .thumb_set TIM1_BRK_UP_TRG_COM_IRQHandler,Default_Handler
+
+  .weak      TIM1_CC_IRQHandler
+  .thumb_set TIM1_CC_IRQHandler,Default_Handler
+
+  .weak      TIM2_IRQHandler
+  .thumb_set TIM2_IRQHandler,Default_Handler
+
+  .weak      TIM3_IRQHandler
+  .thumb_set TIM3_IRQHandler,Default_Handler
+
+  .weak      TIM6_DAC_LPTIM1_IRQHandler
+  .thumb_set TIM6_DAC_LPTIM1_IRQHandler,Default_Handler
+
+  .weak      TIM7_LPTIM2_IRQHandler
+  .thumb_set TIM7_LPTIM2_IRQHandler,Default_Handler
+
+  .weak      TIM14_IRQHandler
+  .thumb_set TIM14_IRQHandler,Default_Handler
+
+  .weak      TIM15_IRQHandler
+  .thumb_set TIM15_IRQHandler,Default_Handler
+
+  .weak      TIM16_IRQHandler
+  .thumb_set TIM16_IRQHandler,Default_Handler
+
+  .weak      TIM17_IRQHandler
+  .thumb_set TIM17_IRQHandler,Default_Handler
+
+  .weak      I2C1_IRQHandler
+  .thumb_set I2C1_IRQHandler,Default_Handler
+
+  .weak      I2C2_IRQHandler
+  .thumb_set I2C2_IRQHandler,Default_Handler
+
+  .weak      SPI1_IRQHandler
+  .thumb_set SPI1_IRQHandler,Default_Handler
+
+  .weak      SPI2_IRQHandler
+  .thumb_set SPI2_IRQHandler,Default_Handler
+
+  .weak      USART1_IRQHandler
+  .thumb_set USART1_IRQHandler,Default_Handler
+
+  .weak      USART2_IRQHandler
+  .thumb_set USART2_IRQHandler,Default_Handler
+
+  .weak      USART3_4_LPUART1_IRQHandler
+  .thumb_set USART3_4_LPUART1_IRQHandler,Default_Handler
+
+  .weak      CEC_IRQHandler
+  .thumb_set CEC_IRQHandler,Default_Handler
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+