# STM32F0xx Makefile

# #####################################

#

# Part of the uCtools project

# uctools.github.com

#

#######################################

# user configuration:

#######################################

# SOURCES: list of sources in the user application

# TARGET: name of the user application

TARGET = main

# BUILD_DIR: directory to place output files in

BUILD_DIR = build

# LD_SCRIPT: location of the linker script

LD_SCRIPT = stm32f042c6_flash.ld

# USER_DEFS user defined macros

USER_DEFS = -D HSI48_VALUE=48000000 -D HSE_VALUE=16000000

# USER_INCLUDES: user defined includes

USER_INCLUDES =

# USB_INCLUDES: includes for the usb library

USB_INCLUDES = -Imiddlewares/ST/STM32_USB_Device_Library/Core/Inc

USB_INCLUDES += -Imiddlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc

# USER_CFLAGS: user C flags (enable warnings, enable debug info)

USER_CFLAGS = -Wall -g -ffunction-sections -fdata-sections -Os

# USER_LDFLAGS:  user LD flags

USER_LDFLAGS = -fno-exceptions -ffunction-sections -fdata-sections -Wl,--gc-sections

# TARGET_DEVICE: device to compile for

TARGET_DEVICE = STM32F042x6

#######################################

# end of user configuration

#######################################

#

#######################################

# binaries

#######################################

CC = arm-none-eabi-gcc

AR = arm-none-eabi-ar

RANLIB = arm-none-eabi-ranlib

SIZE = arm-none-eabi-size

OBJCOPY = arm-none-eabi-objcopy

MKDIR = mkdir -p

#######################################

# core and CPU type for Cortex M0

# ARM core type (CORE_M0, CORE_M3)

CORE = CORE_M0

# ARM CPU type (cortex-m0, cortex-m3)

CPU = cortex-m0

# where to build STM32Cube

CUBELIB_BUILD_DIR = $(BUILD_DIR)/STM32Cube

# various paths within the STmicro library

CMSIS_PATH = drivers/CMSIS

CMSIS_DEVICE_PATH = $(CMSIS_PATH)/Device/ST/STM32F0xx

DRIVER_PATH = drivers/STM32F0xx_HAL_Driver

# includes for gcc

INCLUDES = -I$(CMSIS_PATH)/Include

INCLUDES += -I$(CMSIS_DEVICE_PATH)/Include

INCLUDES += -I$(DRIVER_PATH)/Inc

INCLUDES += -I$(CURDIR)

INCLUDES += -I$(CURDIR)/usb

INCLUDES += $(USB_INCLUDES)

INCLUDES += $(USER_INCLUDES)

# macros for gcc

DEFS = -D$(CORE) $(USER_DEFS) -D$(TARGET_DEVICE)

# compile gcc flags

CFLAGS = $(DEFS) $(INCLUDES)

CFLAGS += -mcpu=$(CPU) -mthumb

CFLAGS += $(USER_CFLAGS)

# default action: build the user application

all: $(BUILD_DIR)/$(TARGET).hex

#######################################

# build the st micro peripherial library

# (drivers and CMSIS)

#######################################

CUBELIB = $(CUBELIB_BUILD_DIR)/libstm32cube.a

# List of stm32 driver objects

CUBELIB_DRIVER_OBJS = $(addprefix $(CUBELIB_BUILD_DIR)/, $(patsubst %.c, %.o, $(notdir $(wildcard $(DRIVER_PATH)/Src/*.c))))

# shortcut for building core library (make cubelib)

cubelib: $(CUBELIB)

$(CUBELIB): $(CUBELIB_DRIVER_OBJS)

	$(AR) rv $@ $(CUBELIB_DRIVER_OBJS)

	$(RANLIB) $@

$(CUBELIB_BUILD_DIR)/%.o: $(DRIVER_PATH)/Src/%.c | $(CUBELIB_BUILD_DIR)

	$(CC) -c $(CFLAGS) -o $@ $^

$(CUBELIB_BUILD_DIR):

	$(MKDIR) $@

#######################################

# build the USB library

#######################################

USB_MIDDLEWARE_PATH = ./middlewares/ST/STM32_USB_Device_Library/

USB_BUILD_DIR = $(BUILD_DIR)/usb

USB_SOURCES += usbd_ctlreq.c usbd_ioreq.c usbd_core.c usbd_cdc.c

# list of usb library objects

USB_OBJECTS += $(addprefix $(USB_BUILD_DIR)/,$(notdir $(USB_SOURCES:.c=.o)))

usb: $(USB_OBJECTS)

$(USB_BUILD_DIR)/%.o: $(USB_MIDDLEWARE_PATH)/Core/Src/%.c | $(USB_BUILD_DIR)

	$(CC) -Os $(CFLAGS) -c -o $@ $^

$(USB_BUILD_DIR)/%.o: $(USB_MIDDLEWARE_PATH)/Class/CDC/Src/%.c | $(USB_BUILD_DIR)

	$(CC) -Os $(CFLAGS) -c -o $@ $^

$(USB_BUILD_DIR):

	@echo $(USB_BUILD_DIR)

	$(MKDIR) $@

#######################################

# build the user application

#######################################

# list of user program objects

OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(SOURCES:.c=.o)))

# add an object for the startup code

OBJECTS += $(BUILD_DIR)/startup_stm32f042x6.o

# use the periphlib core library, plus generic ones (libc, libm, libnosys)

LIBS = -lstm32cube -lc -lm -lnosys

LDFLAGS = -T $(LD_SCRIPT) -L $(CUBELIB_BUILD_DIR) $(LIBS) $(USER_LDFLAGS)

$(BUILD_DIR)/$(TARGET).hex: $(BUILD_DIR)/$(TARGET).elf

	$(OBJCOPY) -O ihex $(BUILD_DIR)/$(TARGET).elf $@

	$(OBJCOPY) -O binary $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).bin

$(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) $(USB_OBJECTS) $(CUBELIB)

	$(CC) -o $@ $(CFLAGS) $(USER_LDFLAGS) $(OBJECTS) $(USB_OBJECTS) \

		-L$(CUBELIB_BUILD_DIR) -static $(LIBS) -Xlinker \

		-Map=$(BUILD_DIR)/$(TARGET).map \

		-T $(LD_SCRIPT)

	$(SIZE) $@

$(BUILD_DIR)/%.o: %.c | $(BUILD_DIR)

	$(CC) $(CFLAGS) -Os -c -o $@ $^

$(BUILD_DIR)/%.o: %.s | $(BUILD_DIR)

	$(CC) $(CFLAGS) -c -o $@ $^

$(BUILD_DIR):

	$(MKDIR) $@

# delete all user application files, keep the libraries

clean:

		-rm $(BUILD_DIR)/*.o

		-rm $(BUILD_DIR)/*.elf

		-rm $(BUILD_DIR)/*.bin

		-rm $(BUILD_DIR)/*.map

.PHONY: clean all cubelib

#include "stm32f0xx_hal.h"

#include "config.h"

#include "states.h"

#include "ssd1306.h"

#include "gpio.h"

#include "spi.h"

#include "stringhelpers.h"

#include "display.h"

#include "usb_device.h"

#include "usbd_cdc_if.h"

// Prototypes

// Move to header file

void process();

void restore_settings();

void save_settings();

void save_setpoints();

void SystemClock_Config(void);

therm_settings_t set;

therm_status_t status;

// Globalish setting vars

SPI_HandleTypeDef hspi1;

static __IO uint32_t TimingDelay;

void deinit(void)

{

    HAL_DeInit();

}

volatile int i=0;

int main(void)

{

    /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

    HAL_Init();

    /* Configure the system clock */

    SystemClock_Config();

    /* Unset bootloader option bytes (if set) */

    void bootloader_unset(void);

    /* Initialize all configured peripherals */

    init_gpio();

    MX_USB_DEVICE_Init();

    // USB startup delay

    HAL_Delay(1000);

    HAL_GPIO_WritePin(LED_POWER, 1);

    // TODO: Awesome pwm of power LED 

    // Configure 1ms SysTick (change if more temporal resolution needed) 

    //RCC_ClocksTypeDef RCC_Clocks;

    //RCC_GetClocksFreq(&RCC_Clocks);

    //SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);

    // Init SPI busses

    init_spi();

    // Init OLED over SPI

    ssd1306_Init();

    ssd1306_clearscreen();

    // Default settings 

    set.boottobrew = 0;

    set.temp_units = TEMP_UNITS_CELSIUS;

    set.windup_guard = 1;

    set.k_p = 1;

    set.k_i = 1;

    set.k_d = 1;

    set.ignore_tc_error = 0;

    set.setpoint_brew = 0;

    set.setpoint_steam = 0;

    // Default status

    status.temp = 0;

    status.temp_frac = 0;

    status.state_resume = 0;

    status.state = STATE_IDLE;

    status.setpoint = 0;

    status.pid_enabled = 0;

    // Load settings (if any) from EEPROM

    restore_settings();

    // Go to brew instead of idle if configured thusly

    if(set.boottobrew)

      status.state = STATE_PREHEAT_BREW; 

    // Startup screen 

    ssd1306_DrawString("therm v0.2", 1, 40);

    ssd1306_DrawString("protofusion.org/therm", 3, 0);

    HAL_Delay(1500);

    ssd1306_clearscreen();

    // Main loop

    while(1)

    {

        // Process sensor inputs

        process();

        // Run state machine

        display_process(&set, &status); 

    }

}

// Clock configuration

void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct;

  RCC_ClkInitTypeDef RCC_ClkInitStruct;

  RCC_PeriphCLKInitTypeDef PeriphClkInit;

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;

  RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;

  HAL_RCC_OscConfig(&RCC_OscInitStruct);

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;

  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI48;

  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;

  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;

  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1);

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;

  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;

  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);

  __SYSCFG_CLK_ENABLE();

}

// Grab temperature reading from MAX31855

void update_temp() {

    // Assert CS

    HAL_GPIO_WritePin(MAX_CS, 0);

    uint8_t rxdatah[1] = {0x00};

    uint8_t rxdatal[1] = {0x00};

    HAL_SPI_Receive(&hspi1, rxdatah, 1, 100);

    HAL_SPI_Receive(&hspi1, rxdatal, 1, 100);

    // Release CS

    HAL_GPIO_WritePin(MAX_CS, 1);

    // Assemble data array into one var

    uint16_t temp_pre = rxdatal[0] | (rxdatah[0]<<8);

    if(temp_pre & 0b0000000000000010) {

        ssd1306_clearscreen();

        HAL_Delay(100); // FIXME: remove?

        status.tc_errno = 4;

        status.state = STATE_TC_ERROR;

        status.temp = 0;

        status.temp_frac = 0;

    }

    else if(temp_pre & 0b0000000000000001 && !set.ignore_tc_error) {

        status.tc_errno = 1;

        HAL_Delay(100); // FIXME: remove?

        status.state_resume = status.state;

        status.state = STATE_TC_ERROR;

        status.temp = 0;

        status.temp_frac = 0;

    }

    else 

    {

        if(status.state == STATE_TC_ERROR)

        {

            status.state = status.state_resume;

            ssd1306_clearscreen();

        }

        uint8_t sign = status.temp >> 15;// top bit is sign

        temp_pre = temp_pre >> 2; // Drop 2 lowest bits

        status.temp_frac = temp_pre & 0b11; // get fractional part

        status.temp_frac *= 25; // each bit is .25 a degree, up to fixed point

        temp_pre = temp_pre >> 2; // Drop 2 fractional bits 

        int8_t signint;

        if(sign) {

            signint = -1;

        }