STM32 Development Notes

locutus@the-collective.net (Ben Mason) — Sun, 08 Jul 2018 12:05:28 -0400

STM32 Notes

Embedded Wednesdays: Getting Started in Embedded Systems — Embedded

STM32F4 Discovery – Libraries and tutorials for STM32F4 series MCUs by Tilen Majerle. Working with STM32F4xx series and Standard peripheral drivers (STD, SPL) or with STM32F0xx, STM32F4xx or STM32F7xx using Hardware abstraction layer libraries (HAL) from STMicroelectronics. My libraries are built on these 2 packages and are highly optimized compared to them.

Code

CubeMX may duplicate c files in C_SOURCES variable they must be removed of you will get multiple declaration errors in linking

HAL – Hardware abstraction layer, abstracts hardware commands

LL – TBD

Delay – HAL_Delay( 500); * Stop for 1/2 second *

GPIO

Port initialization

  /* Struct options are defined in stm32f1xx_hal_gpio.h */
  GPIO_InitStruct.Pin = GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

The following functions are in format Port, Pin

HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13); – Toggle Pin state

GPIO_PIN_SET == HAL_GPIO_ReadPin(GPIOA, BUTTINPIN) – Read Pin status

HAL_GPIO_WritePin(GPIO_TypeDef * GPIOx, uint16_t GPIO_Pin, GPIO_PinState PinState ) – Write Specific state to Pin

PinState = GPIO_PIN_RESET, GPIO_PIN_SET

UART

both functions should be added un “USER CODE BEGIN 4”

Add following code to allow printf() to print out UART

 _write( file, *outgoing, len) {
   HAL_UART_Transmit(&huart3, outgoing, len, 100);
  return len;
}

This code allows ch = getchar(); to work,

 _read( file, *result, size_t len) {
    HAL_StatusTypeDef status;
     retcode = 0;

   if (len != 0) {
        status = HAL_UART_Receive( &huart3, (uint8_t *) result, len, HAL_MAX_DELAY);

       if (status == HAL_OK) {
            retcode = len;
        }else {
            retcode = -1;
        }
    }
   return( retcode);
}

also add setvbuf(stdin, NULL, _IONBF, 0); before while loop to tune off 1k buffer

i2c

I2C_HandleTypeDef *hi2c
uint8_t data[6];

Shift Address by 1 leaving room for read / write bit

status = HAL_I2C_Master_Receive(hi2c, HMC5883LADDRESS<<1, &data, 6, HMC5883LTIMEOUT);

status = HAL_I2C_Master_Transmit(hi2c, HMC5883LADDRESS<<1, &returntofirstvalue, 1, HMC5883LTIMEOUT);

Programer and Debug

Memory locations

0x2000000 – RAM

0x8000000 – Flash

Bluepill programing

Set the ‘boot 0′ pin/jumper high (1), and keep ‘boot 1’ low (0)
Upload code
For normal use, set both boot pins low (0)
Reset board

st-link utility

GitHub – texane/stlink: stm32 discovery line linux programmer

Programming STM32 Microcontroller Flash in Linux

st-flash write myflash.bin 0x8000000 – write code to flash

st-util – start debugging

./st-util - usage:

  -h, --help		Print this help
  -vXX, --verbose=XX	Specify a specific verbosity level (0..99)
  -v, --verbose		Specify generally verbose logging
  -s X, --stlink_version=X
			Choose what version of stlink to use, (defaults to 2)
  -1, --stlinkv1	Force stlink version 1
  -p 4242, --listen_port=1234
			Set the gdb server listen port. (default port: 4242)
  -m, --multi
			Set gdb server to extended mode.
			st-util will continue listening for connections after disconnect.
  -n, --no-reset
			Do not reset board on connection.

OpenOCD

openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg

telnet localhost 4444

GoJimmyPi: Using OpenOCD and GDB

Programming an STM32F103XXX with a generic “ST Link V2” programmer from Linux · rogerclarkmelbourne/Arduino_STM32 Wiki · GitHub

Simulation

Qemu STM32

IDEs

STM32CubeMX – STM32Cube initialization code generator – STMicroelectronics

SW4STM32 – System Workbench for STM32: free IDE on Windows, Linux and OS X – STMicroelectronics

The System Workbench toolchain, called SW4STM32, is a free multi-OS software development environment based on Eclipse, which supports the full range of STM32 microcontrollers and associated boards.