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Location: therm/main.c
a0df808541ba
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Major cleanup of OLED driver
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#include "stm32l100c_discovery.h"
#include "ssd1306.h"
#include "config.h"
// USB includes
#include "hw_config.h"
#include "usb_lib.h"
#include "usb_desc.h"
#include "usb_pwr.h"
#include "stringhelpers.h"
// TODO: Grab buttonpresses with interrupts
// TODO: Eliminate screen buffer since we aren't using it...
// 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,
};
static __IO uint32_t TimingDelay;
// Move to header file
void init_gpio();
void init_spi();
void process();
void machine();
void delay(__IO uint32_t nTime);
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);
// TODO: Awesome pwm of power LED (TIM4_CH4 or TIM11_CH1)
// TODO: PWM of stat led (TIM3_CH2)
// 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();
// Startup screen
ssd1306_DrawString("therm v0.1", 1, 40);
ssd1306_DrawString("protofusion.org/therm", 3, 0);
delay(1500);
ssd1306_clearscreen();
// Main loop
while(1)
{
// Process sensor inputs
process();
// Run state machine
machine();
}
}
// 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("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)
if(ticks - last_led > 400)
{
GPIO_ToggleBits(LED_POWER);
last_led = ticks;
}
// Every 200ms, set the SSR on unless output is 0
if((ticks - last_ssr_on > SSR_PERIOD) && ssr_output > 0)
{
GPIO_SetBits(LED_STAT);
last_ssr_on = ticks;
}
// Kill SSR after elapsed period less than SSR_PERIOD
if(ticks - last_ssr_on > 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);
}
uint8_t state = STATE_IDLE;
uint8_t goto_mode = 2;
// State machine
void machine()
{
uint8_t last_state = state;
switch(state)
{
// Idle state
case STATE_IDLE:
{
// Write text to OLED
// [ therm :: idle ]
ssd1306_DrawString("therm :: idle ", 0, 40);
char tempstr[6];
itoa_fp(temp, temp_frac, tempstr);
ssd1306_DrawString("Temp: ", 3, 40);
ssd1306_DrawString(" ", 3, 70);
ssd1306_DrawString(tempstr, 3, 72);
ssd1306_drawlogo();
switch(goto_mode) {
case 2:
{
ssd1306_DrawString("-> brew ", 1, 40);
} break;
case 1:
{
ssd1306_DrawString("-> set P/I/D", 1, 40);
} break;
case 0:
{
ssd1306_DrawString("-> setup ", 1, 40);
} break;
}
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
switch(goto_mode) {
case 2:
state = STATE_PREHEAT_BREW;
break;
case 1:
state = STATE_SETP;
break;
case 0:
state = STATE_SETP;
break;
default:
state = STATE_PREHEAT_BREW;
}
}
else if(!GPIO_ReadInputDataBit(SW_UP) && goto_mode < 2) {
goto_mode++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && k_p > 0 && goto_mode > 0) {
goto_mode--;
}
// Event Handler
// N/A
} break;
case STATE_SETP:
{
// Write text to OLED
// [ therm :: set p ]
// [ p = 12 ]
ssd1306_DrawString("Proportional", 0, 40);
char tempstr[6];
itoa(k_p, tempstr);
ssd1306_DrawString("P=", 1, 45);
ssd1306_DrawString(" ", 1, 57);
ssd1306_DrawString(tempstr, 1, 57);
ssd1306_DrawString("Press to accept", 3, 40);
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_SETI;
}
else if(!GPIO_ReadInputDataBit(SW_UP)) {
k_p++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && k_p > 0) {
k_p--;
}
// Event Handler
// N/A
} break;
case STATE_SETI:
{
// Write text to OLED
// [ therm :: set i ]
// [ i = 12 ]
ssd1306_DrawString("Integral", 0, 40);
char tempstr[6];
itoa(k_i, tempstr);
ssd1306_DrawString("I=", 1, 45);
ssd1306_DrawString(" ", 1, 57);
ssd1306_DrawString(tempstr, 1, 57);
ssd1306_DrawString("Press to accept", 3, 40);
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_SETD;
}
else if(!GPIO_ReadInputDataBit(SW_UP)) {
k_i++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && k_i > 0) {
k_i--;
}
// Event Handler
// N/A
} break;
case STATE_SETD:
{
// Write text to OLED
// [ therm :: set d ]
// [ d = 12 ]
ssd1306_DrawString("Derivative", 0, 40);
char tempstr[6];
itoa(k_d, tempstr);
ssd1306_DrawString("D=", 1, 45);
ssd1306_DrawString(" ", 1, 57);
ssd1306_DrawString(tempstr, 1, 57);
ssd1306_DrawString("Press to accept", 3, 40);
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_IDLE;
}
else if(!GPIO_ReadInputDataBit(SW_UP)) {
k_d++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && k_d > 0) {
k_d--;
}
// Event Handler
// N/A
} break;
case STATE_PREHEAT_BREW:
{
// Write text to OLED
// [ therm : preheating brew ]
// [ 30 => 120 C ]
ssd1306_DrawString("Preheating...", 0, 40);
draw_setpoint();
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_IDLE;
}
else if(!GPIO_ReadInputDataBit(SW_UP)) {
setpoint++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && setpoint > 0) {
setpoint--;
}
// Event Handler
if(temp >= setpoint) {
state = STATE_MAINTAIN_BREW;
}
} break;
case STATE_MAINTAIN_BREW:
{
// Write text to OLED
// [ therm : ready to brew ]
// [ 30 => 120 C ]
ssd1306_DrawString("Ready to Brew!", 0, 40);
draw_setpoint();
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_IDLE;
}
else if(!GPIO_ReadInputDataBit(SW_UP)) {
setpoint++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && setpoint > 0) {
setpoint--;
}
// Event Handler
// N/A
} break;
case STATE_PREHEAT_STEAM:
{
// Write text to OLED
// [ therm : preheating steam ]
// [ 30 => 120 C ]
ssd1306_DrawString("Preheating...", 0, 40);
draw_setpoint();
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_IDLE;
}
else if(!GPIO_ReadInputDataBit(SW_UP)) {
setpoint++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && setpoint > 0) {
setpoint--;
}
// Event Handler
if(temp >= setpoint) {
state = STATE_MAINTAIN_STEAM;
}
} break;
case STATE_MAINTAIN_STEAM:
{
// Write text to OLED
// [ therm : ready to steam ]
// [ 30 => 120 C ]
ssd1306_DrawString("Ready to Steam!", 0, 40);
draw_setpoint();
// Button handler
if(!GPIO_ReadInputDataBit(SW_BTN)) {
state = STATE_IDLE;
}
else if(!GPIO_ReadInputDataBit(SW_UP)) {
setpoint++;
}
else if(!GPIO_ReadInputDataBit(SW_DOWN) && setpoint > 0) {
setpoint--;
}
// Event Handler
// N/A
} break;
// Something is terribly wrong
default:
{
state = STATE_IDLE;
} break;
}
if(last_state != state) {
// Clear screen on state change
ssd1306_clearscreen();
}
}
// Delay a number of systicks
void delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
// ISR-triggered decrement of delay and increment of tickcounter
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;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE); /* Enable the SPI */
// MAX IC
SPI_Cmd(SPI2, DISABLE);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b; // Andysworkshop
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; // From andysworkshop
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; // same
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI2, ENABLE); /* Enable the SPI */
}
void init_gpio(void) {
GPIO_InitTypeDef GPIO_InitStruct;
// Enable SPI clocks
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
// Enable GPIO clocks
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC|RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOA, ENABLE);
// Enable DMA clocks (Is AHB even the right thing???)
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); // EMZ TODO get the right ones
/*Configure GPIO pin : PC */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
GPIO_Init(GPIOC, &GPIO_InitStruct);
/*Configure GPIO pin : PB */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_10|GPIO_Pin_12
|GPIO_Pin_9;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);
/*Configure GPIO pin : PA */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
/*Configure GPIO pin : PB */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6
|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
/** SPI1 GPIO Configuration
PA5 ------> SPI1_SCK
PA7 ------> SPI1_MOSI
*/
/*Enable or disable the AHB peripheral clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/*Configure GPIO pin : PA: MOSI,SCK */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
/*Configure GPIO pin alternate function */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
/*Configure GPIO pin alternate function */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
/** SPI2 GPIO Configuration
PB13 ------> SPI2_SCK
PB14 ------> SPI2_MISO
PB15 ------> SPI2_MOSI
*/
/*Enable or disable the AHB peripheral clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
// SPI PINSSS
/*Configure GPIO pin : PB, MOSI, SCK */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_15;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);
GPIO_InitTypeDef GPIO_InitStruct2;
// MISO
GPIO_InitStruct2.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStruct2.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct2.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct2.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct2);
//Configure GPIO pin alternate function
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
/** USB GPIO Configuration
PA11 ------> USB_DM
PA12 ------> USB_DP
*/
/*Enable or disable the AHB peripheral clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/*Configure GPIO pin : PA */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_12;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
}
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