CM4 Project

tags: ARM Cortex-M

使用NUCLEO-F303ZE完成的專案，並實作printf及scanf功能

檔案編排

ARM-Template-Project
|    Makefile
|    README.md
|    STM32F303.svd
|    STM32F303ZETX_FLASH.ld
|    st_nucleo_f3.cfg
|────Inc
|    |    myusart.h
|
|────Src
|    |    main.c 
|    |    myusart.c
|    |    syscall.c
|    |    sysmem.c
|
|────Startup
|    |    startup_stm32f303zetx.s

使用設備

• NUCLEO-F303ZE

  1. 官方文件規格介紹
  2. 核心為: STM32F303ZE 官方文件連結

• 需要工具

  1. ST-Link(和板子連接)

  2. arm-none-eabi-gcc (Essential compiler driver) arm-none-eabi-gcc載點 各種GCC指令總攬

  3. OpenOCD (用來Debug及燒入) OpenOCD for windows載點

目標: 使板子可以使用 printf() 及 scanf() 函式

GPIO設定

• 設定PD8及PD9(兩者為USART3 Tx/Rx)
  1. PD8:
     • GPIOD_MODE: Alternate function mode
     • GPIOD_OSPEEDR: Low Speed
     • GPIOD_PUPDR: No Pull-up & Pull-down
     • GPIOD_OTYPER: Push-Pull
     • GPIOD_AFRH: AF7 (USART3 Tx)
  2. PD9:
     • GPIOD_MODE: Alternate function mode
     • GPIOD_OSPEEDR: Low Speed
     • GPIOD_PUPDR: No Pull-up & Pull-down
     • GPIOD_OTYPER: Push-Pull
     • GPIOD_AFRH: AF7 (USART3 Rx)

USART設定

1. 使用 USART3，因為USART3連接到Virual COM port

   1. PD8 設為 USART3 TX
   2. PD9 設為 USART3 RX

2. USART3基本設定

   • F_CLK: 8MHz (STM32F303ZE預設clock)
   • USART3_Mode: Tx/Rx Enable
   • USART3_Parity: Parity disable
   • USART3_StopBits: 1
   • USART3_WordLen: 8
   • USART3_Baud: 38400
   • USART3_HW_FLOW: None
   • Oversampling: 16

修改 printf 及 scanf system call

1. printf

    int _write(int file, char *ptr, int len)
    {
        MYUSART_SendData((uint8_t*)ptr, len);
        MYUSART_SendData((uint8_t*)"\r", 1);
        return len;
    }
   

2. scanf

    int _read(int file, char *ptr, int len) 
    {
        for (int i = 0; i < len; i++) {
    	    *ptr = (char)MYUSART_ReceiveData();
    	    if(*ptr == '\r') break; /* read Enter */
    	    MYUSART_SendData((uint8_t*)ptr++, 1);
        }
        MYUSART_SendData((uint8_t*)"\n\r", 2);
        return len;
    }
   

使用步驟

make

$ make
mkdir Debug
arm-none-eabi-gcc -c -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DUSE_HAL_DRIVER -DSTM32F303xE -IInc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"Debug/main.d" -Wa,-a,-ad,-alms=Debug/main.lst ./Src/main.c -o Debug/main.o
arm-none-eabi-gcc -c -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DUSE_HAL_DRIVER -DSTM32F303xE -IInc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"Debug/myusart.d" -Wa,-a,-ad,-alms=Debug/myusart.lst ./Src/myusart.c -o Debug/myusart.o
arm-none-eabi-gcc -c -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DUSE_HAL_DRIVER -DSTM32F303xE -IInc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"Debug/syscalls.d" -Wa,-a,-ad,-alms=Debug/syscalls.lst ./Src/syscalls.c -o Debug/syscalls.o
arm-none-eabi-gcc -c -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DUSE_HAL_DRIVER -DSTM32F303xE -IInc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"Debug/sysmem.d" -Wa,-a,-ad,-alms=Debug/sysmem.lst ./Src/sysmem.c -o Debug/sysmem.o
arm-none-eabi-gcc -x assembler-with-cpp -c -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DUSE_HAL_DRIVER -DSTM32F303xE -IInc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"Debug/startup_stm32f303zetx.d" ./Startup/startup_stm32f303zetx.s -o Debug/startup_stm32f303zetx.o
arm-none-eabi-gcc Debug/main.o Debug/myusart.o Debug/syscalls.o Debug/sysmem.o   Debug/startup_stm32f303zetx.o   -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -specs=nano.specs -TSTM32F303ZETX_FLASH.ld  -lc -lm -lnosys -Wl,-Map=Debug/main.map,--cref -Wl,--gc-sections -o Debug/main.elf
arm-none-eabi-size Debug/main.elf
   text    data     bss     dec     hex filename
   4196     108    1588    5892    1704 Debug/main.elf

make upload

$ make upload
openocd -f interface/stlink.cfg -f target/stm32f3x.cfg -c " program Debug/main.elf verify exit "
xPack OpenOCD x86_64 Open On-Chip Debugger 0.11.0+dev (2021-12-07-17:33)
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport "hla_swd". To override use 'transport select <transport>'.
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
Info : DEPRECATED target event trace-config; use TPIU events {pre,post}-{enable,disable}
Info : clock speed 1000 kHz
Info : STLINK V2J38M27 (API v2) VID:PID 0483:374B
Info : Target voltage: 3.245115
Info : stm32f3x.cpu: Cortex-M4 r0p1 processor detected
Info : stm32f3x.cpu: target has 6 breakpoints, 4 watchpoints
Info : starting gdb server for stm32f3x.cpu on 3333
Info : Listening on port 3333 for gdb connections
Info : Unable to match requested speed 1000 kHz, using 950 kHz
Info : Unable to match requested speed 1000 kHz, using 950 kHz
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x08000508 msp: 0x20010000
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
** Programming Started **
Info : device id = 0x10036446
Info : flash size = 512kbytes
** Programming Finished **
** Verify Started **
** Verified OK **
shutdown command invoked

結果(在putty上顯示)

Eclipse: Error: init mode failed (unable to connect to the target)

送電異常導致Flash memory內部亂掉

解決方法use IDE

• Use STLinkUtility
• Use Linux

開啟STLinkUtility

按下插頭連接板子

如果無法連接 Target -> Settings -> Mode -> Connect under reset. 再次連接

Utility 開著的時候不能upload

橡皮擦清除Flash memory即可