#include "main.h"
#include "stm32l100c_discovery.h"
#include "ssd1306.h"
// USB includes
#include "hw_config.h"
#include "usb_lib.h"
#include "usb_desc.h"
#include "usb_pwr.h"
#define LED_POWER GPIOB,GPIO_Pin_9
#define LED_STAT GPIOA,GPIO_Pin_15
#define MAX_CS GPIOB,GPIO_Pin_12
// TODO: Grab buttonpresses with interrupts
#define SW_BTN GPIOB, GPIO_Pin_3
#define SW_UP GPIOB, GPIO_Pin_7
#define SW_DOWN GPIOB, GPIO_Pin_6
#define SW_LEFT GPIOB, GPIO_Pin_5
#define SW_RIGHT GPIOB, GPIO_Pin_4
// USB Supporting Vars
extern __IO uint8_t Receive_Buffer[64];
extern __IO uint32_t Receive_length ;
extern __IO uint32_t length ;
uint8_t Send_Buffer[64];
uint32_t packet_sent=1;
uint32_t packet_receive=1;
char* itoa(int32_t i, char b[]){
char* itoa(int16_t i, char b[]){
char const digit[] = "0123456789";
char* p = b;
if(i<0){
*p++ = '-';
i *= -1;
}
int shifter = i;
uint16_t shifter = i;
do{ //Move to where representation ends
++p;
shifter = shifter/10;
}while(shifter);
*p = '\0';
do{ //Move back, inserting digits as you go
*--p = digit[i%10];
i = i/10;
}while(i);
return b;
int32_t round(double x) {
if (x >= 0)
return (long) (x+0.5);
return (long) (x-0.5);
static __IO uint32_t TimingDelay;
// Move to header file
void init_gpio();
void init_spi();
void process();
void machine();
int main(void)
{
// Init clocks
SystemInit();
init_gpio();
// Init USB
//Set_USBClock();
//USB_Interrupts_Config();
//USB_Init();
GPIO_SetBits(LED_POWER);
RCC_ClocksTypeDef RCC_Clocks;
// SysTick end of count event each 1ms
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
GPIO_ResetBits(LED_STAT);
Delay(100);
Delay(500);
GPIO_ResetBits(LED_POWER);
init_spi();
ssd1306_Init();
ssd1306_block_write();
ssd1306_DrawString("therm 0.1", 0, 40);
ssd1306_DrawString("Status: Idle", 2, 40);
// ssd1306_block_write();
ssd1306_test();
uint8_t toggle = 0;
int16_t temp = -231;
while(1)
//ssd1306_block_write();
// Process sensor inputs [TODO: 5hz?]
process();
// Run state machine [TODO: 50hz?]
machine();
// probably just passed the actual port
uint8_t sw_btn = GPIO_ReadInputDataBit(SW_BTN);
//uint8_t sw_up = GPIO_ReadInputDataBit(SW_UP);
//uint8_t sw_down = GPIO_ReadInputDataBit(SW_DOWN);
//uint8_t sw_left = GPIO_ReadInputDataBit(SW_LEFT);
//uint8_t sw_right = GPIO_ReadInputDataBit(SW_RIGHT);
if(!sw_btn) {
GPIO_ToggleBits(LED_STAT);
if(!toggle) {
GPIO_SetBits(GPIOB, GPIO_Pin_13);
toggle = ! toggle;
else {
GPIO_ResetBits(GPIOB, GPIO_Pin_13);
Delay(50);
int32_t temp = 0;
int32_t setpoint = 0;
int32_t p = 1;
int32_t i = 1;
int32_t d = 1;
// Process things
void process()
// Assert CS
GPIO_ResetBits(MAX_CS);
Delay(1);
// This may not clock at all... might need to send 16 bits first
SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
uint16_t temp1 = SPI_I2S_ReceiveData(SPI2);
// SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
uint16_t temp2 = 0;//SPI_I2S_ReceiveData(SPI2);
SPI_I2S_SendData(SPI2, 0xAAAA); // send dummy data
//SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
uint16_t temp_pre = SPI_I2S_ReceiveData(SPI2);
if(temp_pre & 0b0000000000000010) {
ssd1306_DrawString("Fatal Error", 3, 35);
else if(temp_pre & 0b0000000000000001) {
ssd1306_DrawString("TC Fault", 3, 35);
ssd1306_DrawString("OK ", 3, 35);
uint8_t sign = temp >> 15;// top bit is sign
temp_pre = temp_pre >> 2; // Drop 2 lowest bits
int16_t temp = 0;
if(sign) {
temp = -temp_pre;
temp = temp_pre;
// Deassert CS
GPIO_SetBits(MAX_CS);
int32_t temp = (temp1 << 16) | temp2;
//////////////////////////
// Calc internal temp //
/* temp = temp >> 4; // Drop last 4 bits, no need for them
float internal_temp = temp & 0x7FF // Lower 11bits are internal temp
// Check internal temp sign
if(temp & 0x800) {
// Convert to negative value by extending sign and casting to signed type.
int16_t tmp = 0xF800 | (temp & 0x7FF);
internal_temp = tmp;
internal_temp *= 0.0625; // LSB = 0.0625 degrees
// Now we have a good internal temp!
*/
// Calc external temp //
if(temp & 0x7) {
// Something is wrong...
ssd1306_DrawString("!TempCOMMS", 3, 35);
if(temp & 0x80000000) {
// Negative value, drop the lower 18 bits and explicitly extend sign bits
temp = 0xFFFFC000 | ((temp >> 18) & 0x00003FFFF);
// Positive value, just drop lower 18
temp >>= 18;
double temp_centigrade = temp;
if(temp > 0) {
GPIO_SetBits(LED_STAT);
char tempstr[9];
itoa(temp, tempstr);
itoa(temp_pre, tempstr);
ssd1306_DrawString("Temp: ", 1, 40);
ssd1306_DrawString(" ", 1, 70);
ssd1306_DrawString(tempstr, 1, 70);
/*
if((!retval || (temp & 0x2) != 0))
//return; // Comms error - this is happening right now
else if((temp & 0x4)!= 0)
ssd1306_DrawString("!OpenThermocouple", 3, 40);
//return; // Open thermocouple
temp = (temp & 0x7FF8) >> 5;
// TODO: Add calibration offset (linear)
// Perform PID calculations
// Write output to SSR
enum state {
STATE_IDLE = 0,
STATE_SETP,
STATE_SETI,
STATE_SETD,
STATE_PREHEAT_BREW,
STATE_MAINTAIN_BREW,
STATE_PREHEAT_STEAM,
STATE_MAINTAIN_STEAM,
};
uint8_t state = STATE_IDLE;
// State machine
void machine()
switch(state)
// Idle state
case STATE_IDLE:
// Write text to OLED
// [ therm :: idle ]
ssd1306_DrawString("therm :: idle ", 0, 40);
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_SETP;
// Event Handler
// N/A
} break;
case STATE_SETP:
// [ therm :: set p ]
// [ p = 12 ]
ssd1306_DrawString("therm :: set p", 0, 40);
state = STATE_SETI;
case STATE_SETI:
// [ therm :: set i ]
// [ i = 12 ]
ssd1306_DrawString("therm :: set i", 0, 40);
state = STATE_SETD;
Status change: