@@ -71,50 +71,51 @@ int main(void)
// Init GPIO
init_gpio();
// Turn on power LED
GPIO_SetBits(LED_POWER);
// TODO: Awesome pwm of power LED (TIM4_CH4 or TIM11_CH1)
// 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();
// Check for problems on startup
if(clock_fail) {
//ssd1306_DrawStringBig("ERROR: Check Xtal", 2, 0);
ssd1306_DrawStringBig("XTAL ERR", 2, 0);
delay(5000);
ssd1306_DrawStringBig("NO XTAL", 2, 0);
delay(1000);
}
// Init USB
//Set_System(); // hw_config.h
Set_USBClock();
USB_Interrupts_Config();
USB_Init();
//SYSCFG_USBPuCmd(ENABLE);
//PowerOn();
// Startup screen
ssd1306_DrawString("therm v0.1", 1, 40);
ssd1306_DrawString("protofusion.org/therm", 3, 0);
delay(1500);
restore_settings();
if(boottobrew)
state = STATE_PREHEAT_BREW; // Go to brew instead of idle if configured thusly
GPIO_ResetBits(LED_STAT);
// Main loop
@@ -243,75 +244,72 @@ void process()
GPIO_ToggleBits(LED_POWER);
last_led = ticks;
// Every 200ms, set the SSR on unless output is 0
if((ticks - last_ssr_on > SSR_PERIOD))
{
if(pid_enabled)
// Get ssr output for next time
int16_t power_percent = update_pid(k_p, k_i, k_d, temp, temp_frac, 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;
else
ssr_output = 0;
// Only support heating (ssr_output > 0) right now
if(ssr_output > 0) {
char tempstr[6];
itoa(ssr_output, tempstr);
ssd1306_DrawString("#=", 2, 45);
ssd1306_DrawString(" ", 2, 57);
ssd1306_DrawString(tempstr, 2, 57);
ssd1306_DrawString(tempstr, 0, 90);
GPIO_SetBits(LED_STAT);
GPIO_SetBits(SSR_PIN);
last_ssr_on = ticks;
// Kill SSR after elapsed period less than SSR_PERIOD
if(ticks - last_ssr_on > ssr_output || ssr_output == 0)
GPIO_ResetBits(SSR_PIN);
void draw_setpoint() {
char tempstr[3];
itoa_fp(temp, temp_frac, tempstr);
//ssd1306_DrawString(" ", 3, 40);
ssd1306_DrawString(tempstr, 3, 40);
ssd1306_DrawString("-> ", 3, 80);
ssd1306_DrawStringBig(tempstr, 3, 0);
ssd1306_DrawStringBig(">", 3, 74);
itoa(setpoint, tempstr);
ssd1306_DrawString(" ", 3, 95);
ssd1306_DrawString(tempstr, 3, 95);
ssd1306_DrawStringBig(" ", 3, 90);
ssd1306_DrawStringBig(tempstr, 3, 90);
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)
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);
@@ -573,129 +571,129 @@ void machine()
ssd1306_DrawString("Press to accept", 3, 40);
// Button handler
if(SW_BTN_PRESSED) {
save_settings();
state = STATE_IDLE;
else if(!GPIO_ReadInputDataBit(SW_UP)) {
boottobrew = 1;
else if(!GPIO_ReadInputDataBit(SW_DOWN)) {
boottobrew = 0;
// Event Handler
// N/A
} break;
case STATE_PREHEAT_BREW:
// Write text to OLED
// [ therm : preheating brew ]
// [ 30 => 120 C ]
ssd1306_DrawString("Preheating...", 0, 40);
ssd1306_drawlogo();
ssd1306_DrawString("Preheating...", 0, 0);
//ssd1306_drawlogo();
draw_setpoint();
pid_enabled = 1;
setpoint = setpoint_brew;
save_setpoints(); // TODO: Check for mod
else {
user_input(&setpoint_brew);
if(temp >= setpoint) {
state = STATE_MAINTAIN_BREW;
case STATE_MAINTAIN_BREW:
// [ therm : ready to brew ]
ssd1306_DrawString("Ready to Brew!", 0, 40);
ssd1306_DrawString("Preheated!", 0, 0);
case STATE_PREHEAT_STEAM:
// [ therm : preheating steam ]
setpoint = setpoint_steam;
user_input(&setpoint_steam);
state = STATE_MAINTAIN_STEAM;
case STATE_MAINTAIN_STEAM:
// [ therm : ready to steam ]
ssd1306_DrawString("Ready to Steam!", 0, 40);
ssd1306_DrawString("Ready to Steam!", 0, 0);
// Something is terribly wrong
default:
pid_enabled = 0;
Status change: