#include "stm32f0xx_hal.h"
#include "ssd1306.h"
#include "stringhelpers.h"
#include "display.h"
#include "config.h"
#include "states.h"
#include "bootlib.h"
#include "gpio.h"
uint8_t goto_mode = 2;
// State machine
uint8_t sw_btn_last = 0;
uint8_t sw_up_last = 0;
uint8_t sw_down_last = 0;
uint8_t sw_left_last = 0;
uint8_t sw_right_last = 0;
#define SW_BTN_PRESSED (sw_btn_last == 0 && sw_btn == 1) // rising edge on buttonpress
#define SW_UP_PRESSED (sw_up_last == 0 && sw_up == 1)
#define SW_DOWN_PRESSED (sw_down_last == 0 && sw_down == 1)
#define SW_LEFT_PRESSED (sw_left_last == 0 && sw_left == 1)
#define SW_RIGHT_PRESSED (sw_right_last == 0 && sw_right == 1)
///////////////////////////////////////////////////////////////////////////////////////
/// freaking multiple setpoint support ///
uint8_t step_duration[10] = {0,0,0,0,0,0,0,0,0,0};
int16_t step_setpoint[10] = {0,0,0,0,0,0,0,0,0,0};
uint8_t final_setpoint = 0;
// Multiple screens to set setpoint and duration on each screen
// press center to go to the next one, and press left or right or something to confirm
// When executing, complete on time AND(?) temperature. Maybe allow switching to OR via settings
////////////////////////////////////////////////////////////////////////////////////////////////
uint8_t trigger_drawsetpoint = 1;
int16_t last_temp = 21245;
void display_process(therm_settings_t* set, therm_status_t* status)
{
uint8_t last_state = status->state;
uint8_t temp_changed = status->temp != last_temp;
last_temp = status->temp;
uint8_t sw_btn = !HAL_GPIO_ReadPin(SW_BTN);
uint8_t sw_up = !HAL_GPIO_ReadPin(SW_UP);
uint8_t sw_down = !HAL_GPIO_ReadPin(SW_DOWN);
uint8_t sw_left = !HAL_GPIO_ReadPin(SW_LEFT);
uint8_t sw_right = !HAL_GPIO_ReadPin(SW_RIGHT);
switch(status->state)
// Idle state
case STATE_IDLE:
// Write text to OLED
// [ therm :: idle ]
ssd1306_DrawString("therm :: idle ", 0, 40);
status->pid_enabled = 0;
if(temp_changed) {
char tempstr[6];
itoa_fp(status->temp, status->temp_frac, tempstr);
ssd1306_DrawString("Temp: ", 3, 40);
ssd1306_DrawString(" ", 3, 72);
ssd1306_DrawString(tempstr, 3, 72);
}
ssd1306_drawlogo();
switch(goto_mode) {
case 2:
ssd1306_DrawString("-> heat ", 1, 40);
} break;
case 1:
ssd1306_DrawString("-> setup ", 1, 40);
case 0:
ssd1306_DrawString("-> reset ", 1, 40);
// Button handler
if(SW_BTN_PRESSED) {
status->state = STATE_PREHEAT_BREW;
break;
status->state = STATE_SETP;
ssd1306_clearscreen();
ssd1306_DrawString("Entering Bootloader", 1, 0);
ssd1306_DrawString("(hopefully)", 2, 0);
HAL_Delay(1000);
bootloader_enter();
/*
HAL_RCC_DeInit();
SysTick->CTRL = 0;
SysTick->LOAD = 0;
SysTick->VAL = 0;
__set_PRIMASK(1);
__set_MSP(0x200010000);
*((unsigned long *)0x200017F0) = 0xDEADBEEF; // 6KB STM32F042
NVIC_SystemReset();
*/
status->state = STATE_IDLE;
default:
else if(SW_UP_PRESSED && goto_mode < 2) {
goto_mode++;
else if(SW_DOWN_PRESSED && goto_mode > 0) {
goto_mode--;
// Event Handler
// N/A
case STATE_SETP:
// [ therm :: set p ]
// [ p = 12 ]
ssd1306_DrawString("Proportional", 0, 40);
itoa(set->k_p, tempstr, 10);
ssd1306_DrawString("P=", 1, 45);
ssd1306_DrawString(" ", 1, 57);
ssd1306_DrawString(tempstr, 1, 57);
ssd1306_DrawString("Press to accept", 3, 40);
status->state = STATE_SETI;
else {
user_input(&set->k_p);
case STATE_SETI:
// [ therm :: set i ]
// [ i = 12 ]
ssd1306_DrawString("Integral", 0, 40);
itoa(set->k_i, tempstr, 10);
ssd1306_DrawString("I=", 1, 45);
status->state = STATE_SETD;
user_input(&set->k_i);
case STATE_SETD:
// [ therm :: set d ]
// [ d = 12 ]
ssd1306_DrawString("Derivative", 0, 40);
itoa(set->k_d, tempstr, 10);
ssd1306_DrawString("D=", 1, 45);
status->state = STATE_SETWINDUP;
user_input(&set->k_d);
case STATE_SETSTEPS:
// [ step #1:: Duration: ### ]
// [ Setpoint: ### ]
itoa(final_setpoint, tempstr, 10);
ssd1306_DrawString("Step #", 0, 0);
ssd1306_DrawString(tempstr, 0, 40);
ssd1306_DrawString("Duration: ", 0, 5);
itoa(step_duration[final_setpoint], tempstr, 10);
ssd1306_DrawString(tempstr, 0, 70);
ssd1306_DrawString("Setpoint: ", 0, 0);
itoa(step_setpoint[final_setpoint], tempstr, 10);
// Button handler - TODO: increment max_step if pressed
// return and go to next state otherwise
status->state = STATE_SETSTEPS;
final_setpoint++;
// else if(SW_LEFT_PRESSED) {
// state++; // go to next state or something
// }
case STATE_SETWINDUP:
// [ therm :: set windup ]
// [ g = 12 ]
ssd1306_DrawString("Windup Guard", 0, 40);
itoa(set->windup_guard, tempstr, 10);
ssd1306_DrawString("G=", 1, 45);
status->state = STATE_SETBOOTTOBREW;
user_input(&set->windup_guard);
case STATE_SETBOOTTOBREW:
ssd1306_DrawString("Start on Boot", 0, 40);
ssd1306_DrawString("sob=", 1, 45);
if(set->boottobrew)
ssd1306_DrawString("Enabled ", 1, 70);
else
ssd1306_DrawString("Disabled", 1, 70);
status->state = STATE_SETUNITS;
else if(!HAL_GPIO_ReadPin(SW_UP)) {
set->boottobrew = 1;
else if(!HAL_GPIO_ReadPin(SW_DOWN)) {
set->boottobrew = 0;
case STATE_SETUNITS:
ssd1306_DrawString("Units: ", 0, 40);
if(set->temp_units == TEMP_UNITS_FAHRENHEIT)
ssd1306_DrawString("Fahrenheit", 1, 60);
ssd1306_DrawString("Celsius ", 1, 60);
save_settings();
status->state = STATE_SETTEMPOFFSET;
set->temp_units = TEMP_UNITS_FAHRENHEIT;
set->temp_units = TEMP_UNITS_CELSIUS;
case STATE_SETTEMPOFFSET:
// [ therm :: set temp offset ]
ssd1306_DrawString("Thermocouple Offset", 0, 40);
itoa(set->temp_offset, tempstr, 10);
ssd1306_DrawString("O=", 1, 45);
user_input_signed(&set->temp_offset);
case STATE_PREHEAT_BREW:
// [ therm : preheating brew ]
// [ 30 => 120 C ]
ssd1306_DrawString("Preheating...", 0, 0);
//ssd1306_drawlogo();
draw_setpoint(status);
status->pid_enabled = 1;
status->setpoint = set->setpoint_brew;
save_setpoints(); // TODO: Check for mod
user_input(&set->setpoint_brew);
if(status->temp >= status->setpoint) {
status->state = STATE_MAINTAIN_BREW;
case STATE_MAINTAIN_BREW:
// [ therm : ready to brew ]
ssd1306_DrawString("Preheated!", 0, 0);
case STATE_PREHEAT_STEAM:
// [ therm : preheating steam ]
status->setpoint = set->setpoint_steam;
user_input(&set->setpoint_steam);
status->state = STATE_MAINTAIN_STEAM;
case STATE_MAINTAIN_STEAM:
// [ therm : ready to steam ]
ssd1306_DrawString("Ready to Steam!", 0, 0);
case STATE_TC_ERROR:
ssd1306_DrawString("Error:", 0, 0);
ssd1306_DrawString("Connect thermocouple", 1, 0);
ssd1306_DrawString("Press -> to ignore", 3, 0);
else if(SW_RIGHT_PRESSED) {
set->ignore_tc_error = 1;
// Maybe handle if TC is plugged in
// Something is terribly wrong
if(last_state != status->state) {
// Clear screen on state change
goto_mode = 2;
trigger_drawsetpoint = 1;
// Last buttonpress
sw_btn_last = sw_btn;
sw_up_last = sw_up;
sw_down_last = sw_down;
sw_left_last = sw_left;
sw_right_last = sw_right;
int32_t temp_last = 43002;
int32_t setpoint_last = 10023;
void draw_setpoint(therm_status_t* status) {
// FIXME: need to do this when switching modes too
if(status->temp != temp_last || trigger_drawsetpoint) {
char tempstr[3];
ssd1306_DrawStringBig(" ", 3, 0);
ssd1306_DrawStringBig(tempstr, 3, 0);
if(trigger_drawsetpoint)
ssd1306_DrawStringBig(">", 3, 74);
if(status->setpoint != setpoint_last || trigger_drawsetpoint) {
itoa(status->setpoint, tempstr, 10);
ssd1306_DrawStringBig(" ", 3, 90);
ssd1306_DrawStringBig(tempstr, 3, 90);
trigger_drawsetpoint = 0;
setpoint_last = status->setpoint;
temp_last = status->temp;
// vim:softtabstop=4 shiftwidth=4 expandtab
#include "stm32f0xx_hal_conf.h"
#include <inttypes.h>
// Increase on each press, and increase at a fast rate after duration elapsed of continuously holding down... somehow...
uint32_t change_time_reset = 0;
void user_input(uint16_t* to_modify)
if(CHANGE_ELAPSED) {
if(!HAL_GPIO_ReadPin(SW_UP) ) {
CHANGE_RESET;
(*to_modify)++;
else if(!HAL_GPIO_ReadPin(SW_DOWN) && (*to_modify) > 0) {
(*to_modify)--;
void user_input_signed(int16_t* to_modify)
// TODO: Bounds check on int16_t
void init_gpio(void) {
GPIO_InitTypeDef GPIO_InitStruct;
/* GPIO Ports Clock Enable */
__GPIOF_CLK_ENABLE();
__GPIOA_CLK_ENABLE();
__GPIOB_CLK_ENABLE();
__SPI1_CLK_ENABLE();
//////////////////
// PORT F //
// PORTF OUTPUT
// Configure GPIO pin : PF0 [Power LED]
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
// PORTF UNUSED
// Configure GPIO pin : PF1
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
// PORT A //
// PORT A OUTPUT
// Configure GPIO pins : (SSR+ CS_OLED RES D/C CS_MAX)
GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_15;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
// PORTA INPUT
// Configure GPIO pin : PA15
// GPIO_InitStruct.Pin = GPIO_PIN_15;
// GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
// GPIO_InitStruct.Pull = GPIO_PULLUP;
// HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
// PORTA UNUSED
// Configure GPIO pins : PA0 PA8
GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_8;
// USART1 [PORTA]
// Configure GPIO pins : PA9 PA10
GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Alternate = GPIO_AF1_USART1;
// SPI1 [PORTA]
// Configure GPIO pin : PA, MOSI, SCK
GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_5;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF0_SPI1;
// Configure GPIO pin: PA, MISO
GPIO_InitStruct.Pin = GPIO_PIN_6;
// USB [PORTA]
/** USB GPIO Configuration
PA11 ------> USB_DM
PA12 ------> USB_DP
// Configure GPIO pin : PA, D+, D-
GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12;
GPIO_InitStruct.Alternate = GPIO_AF2_USB; // Can also be AF5
// PORT B //
// PORT B UNUSED
// Configure GPIO pins : PB0 PB1 PB8
GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_8;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
// PORT B INPUT
// Configure GPIO pins : PB3 PB4 PB5 PB6 PB7
GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6
|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
// Enable DMA clocks (Is AHB even the right thing???)
//RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); // EMZ TODO get the right ones
#ifndef GPIO_H
#define GPIO_H
#define CHANGE_PERIOD_MS 100
#define CHANGE_ELAPSED (HAL_GetTick() - change_time_reset) > CHANGE_PERIOD_MS
#define CHANGE_RESET change_time_reset = HAL_GetTick()
void user_input(uint16_t* to_modify);
void user_input_signed(int16_t* to_modify);
void init_gpio(void);
#endif
#include "eeprom_min.h"
#include "spi.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_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();
// 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();
if(set.boottobrew)
status.state = STATE_PREHEAT_BREW; // Go to brew instead of idle if configured thusly
// Startup screen
ssd1306_DrawString("therm v0.1", 1, 40);
ssd1306_DrawString("protofusion.org/therm", 3, 0);
HAL_Delay(1500);
// Main loop
while(1)
// Process sensor inputs
process();
// Run state machine
display_process(&set, &status);
/** System 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();
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_DrawString("Fatal Error", 3, 35);
HAL_Delay(100);
status.state = STATE_TC_ERROR;
else if(temp_pre & 0b0000000000000001 && !set.ignore_tc_error) {
status.state_resume = status.state;
if(status.state == STATE_TC_ERROR)
status.state = status.state_resume;
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;
signint = 1;
// Convert to Fahrenheit
if(set.temp_units == TEMP_UNITS_FAHRENHEIT)
status.temp = signint * ((temp_pre*100) + status.temp_frac);
status.temp = status.temp * 1.8;
status.temp += 3200;
status.temp_frac = status.temp % 100;
status.temp /= 100;
status.temp += set.temp_offset;
// Use Celsius values
status.temp = temp_pre * signint;
// PID implementation
// TODO: Make struct that has the last_temp and i_state in it, pass by ref. Make struct that has other input values maybe.
int16_t last_pid_temp = 0;
uint8_t last_pid_temp_frac = 0;
int16_t i_state = 0;
int16_t update_pid(uint16_t k_p, uint16_t k_i, uint16_t k_d, int16_t temp, uint8_t temp_frac, int16_t setpoint)
// Calculate instantaneous error
int16_t error = (int16_t)setpoint - (int16_t)temp; // TODO: Use fixed point fraction
// Proportional component
int16_t p_term = k_p * error;
// Error accumulator (integrator)
i_state += error;
// to prevent the iTerm getting huge despite lots of
// error, we use a "windup guard"
// (this happens when the machine is first turned on and
// it cant help be cold despite its best efforts)
// not necessary, but this makes windup guard values
// relative to the current iGain
int16_t windup_guard_res = set.windup_guard / k_i;
// Calculate integral term with windup guard
if (i_state > windup_guard_res)
i_state = windup_guard_res;
else if (i_state < -windup_guard_res)
i_state = -windup_guard_res;
int16_t i_term = k_i * i_state;
// Calculate differential term (slope since last iteration)
int16_t d_term = (k_d * (status.temp - last_pid_temp));
// Save temperature for next iteration
last_pid_temp = status.temp;
last_pid_temp_frac = status.temp_frac;
int16_t result = p_term + i_term - d_term;
// Put out tenths of percent, 0-1000.
if(result > 1000)
result = 1000;
else if(result < -1000)
result = -1000;
// Return feedback
return result;
uint32_t last_ssr_on = 0;
uint32_t last_vcp_tx = 0;
uint32_t last_led = 0;
int16_t ssr_output = 0; // Duty cycle of ssr, 0 to SSR_PERIOD
// Process things
void process()
update_temp(); // Read MAX31855
// TODO: Add calibration offset (linear)
uint32_t ticks = HAL_GetTick();
if(ticks - last_led > 400)
HAL_GPIO_TogglePin(LED_POWER);
last_led = ticks;
// Every 200ms, set the SSR on unless output is 0
if((ticks - last_ssr_on > SSR_PERIOD))
if(status.pid_enabled)
// Get ssr output for next time
int16_t power_percent = update_pid(set.k_p, set.k_i, set.k_d, status.temp, status.temp_frac, status.setpoint);
//power-percent is 0-1000
ssr_output = power_percent; //(((uint32_t)SSR_PERIOD * (uint32_t)10 * (uint32_t)100) * power_percent) / (uint32_t)1000000;
ssr_output = 0;
// Only support heating (ssr_output > 0) right now
if(ssr_output > 0) {
itoa(ssr_output, tempstr, 10);
ssd1306_DrawString(tempstr, 0, 90);
HAL_GPIO_WritePin(SSR_PIN, 1);
last_ssr_on = ticks;
// Kill SSR after elapsed period less than SSR_PERIOD
if(ticks - last_ssr_on > ssr_output || ssr_output == 0)
HAL_GPIO_WritePin(SSR_PIN, 0);
if(ticks - last_vcp_tx > VCP_TX_FREQ)
// Print temp to cdc
char tempstr[16];
itoa_fp(status.temp, status.temp_frac, tempstr);
uint8_t numlen = strlen(tempstr);
tempstr[numlen] = '\r';
tempstr[numlen+1] = '\n';
CDC_Transmit_FS(tempstr, numlen+2);
// while(CDC_Transmit_FS("\r\n", 2) == USBD_BUSY);
last_vcp_tx = ticks;
void save_settings()
Minimal_EEPROM_Unlock();
// Try programming a word at an address divisible by 4
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_BOOTTOBREW, boottobrew);
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_WINDUP_GUARD, windup_guard);
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_K_P, k_p);
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_K_I, k_i);
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_K_D, k_d);
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_UNITS, temp_units);
Minimal_EEPROM_Lock();
void save_setpoints()
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_BREWTEMP, setpoint_brew);
Minimal_EEPROM_ProgramWord(EEPROM_BASE_ADDR + EEPROM_ADDR_STEAMTEMP, setpoint_steam);
// TODO: Make a struct that has all settings in it. Pass by ref to this func in a library.
void restore_settings()
/* Minimal_EEPROM_Unlock();
while(Minimal_FLASH_GetStatus()==FLASH_BUSY);
boottobrew = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_BOOTTOBREW));
windup_guard = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_WINDUP_GUARD));
k_p = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_K_P));
k_i = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_K_I));
k_d = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_K_D));
setpoint_brew = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_BREWTEMP));
setpoint_steam = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_STEAMTEMP));
temp_units = (*(__IO uint32_t*)(EEPROM_BASE_ADDR + EEPROM_ADDR_UNITS));
Minimal_EEPROM_Lock(); */
#ifndef STATES_H
#define STATES_H
typedef struct {
int32_t temp;
uint8_t temp_frac;
uint8_t state_resume;
uint8_t state;
int32_t setpoint;
uint8_t pid_enabled;
} therm_status_t;
uint8_t boottobrew;
uint8_t temp_units;
uint16_t windup_guard;
uint16_t k_p;
uint16_t k_i;
uint16_t k_d;
int16_t temp_offset;
uint8_t ignore_tc_error;
int16_t setpoint_brew;
int16_t setpoint_steam;
} therm_settings_t;
enum tempunits {
TEMP_UNITS_CELSIUS = 0,
TEMP_UNITS_FAHRENHEIT,
};
enum state {
STATE_IDLE = 0,
STATE_SETP,
STATE_SETI,
STATE_SETD,
STATE_SETSTEPS,
STATE_SETWINDUP,
STATE_SETBOOTTOBREW,
STATE_SETUNITS,
STATE_SETTEMPOFFSET,
STATE_PREHEAT_BREW,
STATE_MAINTAIN_BREW,
STATE_PREHEAT_STEAM,
STATE_MAINTAIN_STEAM,
STATE_TC_ERROR
Status change: