Changeset - e331ae8a06e7
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Ethan Zonca - 10 years ago 2014-08-24 00:17:00
ez@ethanzonca.com
Cleanup
1 file changed with 60 insertions and 54 deletions:
main.c
60
54
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main.c
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#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 SSR_PERIOD 200
 
 
#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
 
// TODO: Eliminate screen buffer since we aren't using it...
 
#define SW_BTN  GPIOB, GPIO_Pin_3
 
#define SW_UP   GPIOB, GPIO_Pin_4
 
#define SW_DOWN GPIOB, GPIO_Pin_6
 
#define SW_LEFT GPIOB, GPIO_Pin_5
 
#define SW_RIGHT GPIOB, GPIO_Pin_7
 
 
// 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;
 
 
// State definition
 
enum state {
 
    STATE_IDLE = 0,
 
 
    STATE_SETP,
 
    STATE_SETI,
 
    STATE_SETD,
 
 
    STATE_PREHEAT_BREW,
 
    STATE_MAINTAIN_BREW,
 
    STATE_PREHEAT_STEAM,
 
    STATE_MAINTAIN_STEAM,
 
};
 
 
 
char* itoa(int16_t i, char b[]){
 
    char const digit[] = "0123456789";
 
    char* p = b;
 
    if(i<0){
 
        *p++ = '-';
 
        i *= -1;
 
    }
 
    uint16_t shifter = i;
 
    do{ //Move to where representation ends
 
        ++p;
 
        shifter = shifter/10;
 
@@ -104,157 +121,147 @@ 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_gpio();
 
 
    // Init USB
 
    //Set_USBClock();
 
    //USB_Interrupts_Config();
 
    //USB_Init();
 
 
    // Turn on power LED
 
    GPIO_SetBits(LED_POWER);
 
 
    RCC_ClocksTypeDef RCC_Clocks;
 
    // TODO: Awesome pwm of power LED (TIM4_CH4 or TIM11_CH1)
 
    // TODO: PWM of stat led (TIM3_CH2)
 
 
    // SysTick end of count event each 1ms
 
    // Configure 1ms SysTick (change if more temporal resolution needed)
 
    RCC_ClocksTypeDef RCC_Clocks;
 
    RCC_GetClocksFreq(&RCC_Clocks);
 
    SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
 
 
    GPIO_ResetBits(LED_STAT);
 
    Delay(100);
 
    GPIO_SetBits(LED_POWER);
 
    Delay(500);
 
    GPIO_ResetBits(LED_POWER);
 
 
    // Init SPI busses
 
    init_spi();
 
 
    // Init OLED over SPI
 
    ssd1306_Init();
 
    ssd1306_block_write();
 
    ssd1306_DrawString("therm 0.1", 0, 40);
 
 
 
    uint8_t toggle = 0;
 
    // Startup screen
 
    ssd1306_DrawString("therm v0.1", 1, 40);
 
    ssd1306_DrawString("protofusion.org/therm", 3, 0);
 
    Delay(1500);
 
    ssd1306_block_write();
 
 
    int16_t temp = -231;
 
 
    // Main loop
 
    while(1)
 
    {
 
        //ssd1306_block_write();
 
 
        // Process sensor inputs [TODO: 5hz?]
 
        // Process sensor inputs
 
        process();
 
 
        // Run state machine [TODO: 50hz?]
 
        // Run state machine
 
        machine();
 
        // probably just passed the actual port
 
 
        // TODO: Grab buttonpresses with interrupts
 
        //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);
 
 
        GPIO_SetBits(LED_POWER);
 
        Delay(50);
 
        GPIO_ResetBits(LED_POWER);
 
        Delay(50);
 
    }
 
}
 
 
 
 
// Read temperature and update global temp vars
 
int16_t temp = 0;
 
uint8_t temp_frac = 0;
 
void update_temp() {
 
    // 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, 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", 2, 35);
 
    }
 
    else if(temp_pre & 0b0000000000000001) {
 
        ssd1306_DrawString("TC Fault", 2, 35);
 
        ssd1306_DrawString("Error: No TC", 2, 40);
 
        temp = 0;
 
        temp_frac = 0;
 
    }
 
 
    else
 
    {
 
    uint8_t sign = temp >> 15;// top bit is sign
 
 
    temp_pre = temp_pre >> 2; // Drop 2 lowest bits
 
    temp_frac = temp_pre & 0b11; // get fractional part
 
    temp_frac *= 25; // each bit is .25 a degree, up to fixed point
 
    temp_pre = temp_pre >> 2; // Drop 2 fractional bits
 
 
    if(sign) {
 
        temp = -temp_pre;
 
    }
 
    else {
 
        temp = temp_pre;
 
    }
 
    }
 
 
    // Deassert CS
 
    Delay(1);
 
    GPIO_SetBits(MAX_CS);
 
}
 
 
 
uint32_t ticks = 0;
 
uint32_t last_ssr_on = 0;
 
uint32_t last_led = 0;
 
int32_t setpoint = 0;
 
uint16_t k_p = 1;
 
uint16_t k_i = 1;
 
uint16_t k_d = 1;
 
 
uint8_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)
 
 
    // Perform PID calculations
 
    //if(
 
    GPIO_SetBits(LED_STAT);
 
 
    // Write output to SSR
 
    if(ticks - last_led > 400)
 
    {
 
        GPIO_ToggleBits(LED_POWER);
 
        last_led = ticks;
 
}
 
 
 
    // Every 200ms, set the SSR on
 
    if(ticks - last_ssr_on > SSR_PERIOD)
 
    {
 
        GPIO_SetBits(LED_STAT);
 
        last_ssr_on = ticks;
 
    }
 
 
enum state {
 
    STATE_IDLE = 0,
 
    STATE_SETP,
 
    STATE_SETI,
 
    STATE_SETD,
 
 
    STATE_PREHEAT_BREW,
 
    STATE_MAINTAIN_BREW,
 
    STATE_PREHEAT_STEAM,
 
    STATE_MAINTAIN_STEAM,
 
};
 
 
    // Kill SSR after elapsed period less than SSR_PERIOD
 
    if(ticks - last_ssr_on > ssr_output || !ssr_output)
 
    {
 
        GPIO_ResetBits(LED_STAT);
 
    }
 
}
 
 
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);
 
    itoa(setpoint, tempstr);
 
    ssd1306_DrawString("    ", 3, 95);
 
    ssd1306_DrawString(tempstr, 3, 95);
 
}
 
 
@@ -493,29 +500,27 @@ void machine()
 
            draw_setpoint();
 
 
            // Button handler
 
            if(!GPIO_ReadInputDataBit(SW_BTN)) {
 
                state = STATE_IDLE;
 
            }
 
 
            // Event Handler
 
            // N/A
 
 
        } break;
 
 
 
        // Something is terribly wrong
 
        default:
 
        {
 
            ssd1306_DrawString("therm :: BAD BAD", 0, 40);
 
            state = STATE_IDLE;
 
 
        } break;
 
 
    }
 
 
    if(last_state != state) {
 
        // Clear screen on state change
 
        ssd1306_block_write();
 
    }
 
}
 
 
@@ -534,24 +539,25 @@ void Delay(__IO uint32_t nTime)
 
 
/**
 
  * @brief  Decrements the TimingDelay variable.
 
  * @param  None
 
  * @retval None
 
  */
 
void TimingDelay_Decrement(void)
 
{
 
  if (TimingDelay != 0x00)
 
  {
 
    TimingDelay--;
 
  }
 
  ticks++;
 
}
 
 
 
void init_spi(void)
 
{
 
    SPI_InitTypeDef  SPI_InitStructure;
 
 
    // OLED IC
 
    SPI_Cmd(SPI1, DISABLE);
 
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
 
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
 
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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