First test draft

.gitignore

@@ -1,4 +1,11 @@
 memmap.map
+*.config
+*.creator
+*.cxxflags
+*.files
+*.includes
+*.cflags
+
 *.o
 *.d
 *.elf
@@ -6,3 +13,6 @@ memmap.map
 *.pro
 *.user
 *.user*
+measurement_data
+*.jdebug
+

Makefile

@@ -5,7 +5,7 @@
 #Add Files and Folders below#########################################################
 CFILES 	= main.c syscalls/syscalls.c setup/system_init.c startup/startup_stm32f0xx.c
 ASFILES =
-INCLUDEPATH = -Iinclude -Iinclude/cmsis
+INCLUDEPATH = -Iinclude -Iinclude/cmsis -Ibme680-driver-fork
 
 
 target	= bme680-air-meter
@@ -17,7 +17,7 @@ mapfile = memmap
 
 ##Custom Files###
 
-CFILES += bme680-driver-fork/bme680.c
+CFILES += bme680-driver-fork/bme680.c lcd.c delay.c meas.c
 
 
 ###################################################################################
@@ -28,10 +28,10 @@ SIZE=arm-none-eabi-size
 
 LFLAGS = -mlittle-endian -mthumb -mcpu=cortex-m0 -mthumb-interwork 
 LFLAGS += -mfloat-abi=soft --disable-newlib-supplied-syscalls -nostartfiles
-LFLAGS += -Tstartup/stm32f030.ld -Wl,-Map=$(mapfile).map -Wl,--gc-sections -g -Os
+LFLAGS += -Tstartup/stm32f030.ld -Wl,-Map=$(mapfile).map -Wl,--gc-sections -g -O0
 
 CFLAGS = -c -fmessage-length=0 -mlittle-endian -mthumb -mcpu=cortex-m0 -mthumb-interwork
-CFLAGS += -mfloat-abi=soft -nostartfiles -Wall -g -Os
+CFLAGS += -mfloat-abi=soft -nostartfiles -Wall -g -O0
 
 ####################################################################################
 

delay.c

@@ -0,0 +1,9 @@
+#include <delay.h>
+
+volatile uint32_t tick;
+
+void delay_ms(uint32_t ms)
+{
+	tick = 0;
+	while (tick < ms);
+}

include/delay.h

@@ -0,0 +1,13 @@
+#ifndef __DELAY_H__
+#define __DELAY_H__
+
+#include <stdint.h>
+
+extern volatile uint32_t tick;
+
+/**
+ * @brief wait for specific time in ms. May not be caleed from interrupt context
+ */
+void delay_ms(uint32_t ms);
+
+#endif /* __DELAY_H__ */

include/lcd.h

@@ -0,0 +1,43 @@
+#ifndef __LCD_H__
+#define __LCD_H__
+
+#include <stm32f0xx.h>
+
+#define LCD_DPORT		(GPIOA)
+#define LCD_DATA_BIT_OFFSET	(0)
+#define LCD_RS			(9)
+#define LCD_E			(10)
+
+#define LCD_DATA_MASK		(0xFU << LCD_DATA_BIT_OFFSET)
+#define	LCD_RS_MASK		(1U << LCD_RS)
+#define	LCD_E_MASK		(1U << LCD_E)
+
+/**
+ * @brief Initialize 4 bit LCD mode. GPIOs have to be set up prior to any call of this function
+ */
+void lcd_init(void);
+
+/**
+ * @brief Clear display
+ */
+void lcd_clear(void);
+
+/**
+ * @brief Set cursor position to 0/0
+ */
+void lcd_home(void);
+
+/**
+ * @brief Set cursor to position \p x \p y
+ * @param x Position in line
+ * @param y Line
+ */
+void lcd_setcursor(uint8_t x, uint8_t y);
+
+/**
+ * @brief Write string to current cursor position
+ * @param String to write
+ */
+void lcd_string(const char *data);
+
+#endif /* __LCD_H__ */

include/meas.h

@@ -0,0 +1,22 @@
+#ifndef __MEAS_H__
+#define __MEAS_H__
+
+#include <bme680_defs.h>
+#include <stdbool.h>
+
+/**
+ * @brief Initialize sensor
+ * @return 0 if successful
+ */
+int meas_init_without_gas(void);
+
+/**
+ * @brief Do a single measurement
+ * @param gas_enable select if gas measurement should be done
+ * @param meas_data read data
+ * @param ambient_temp Ambient Temperature
+ * @return 0 if successful
+ */
+int meas_do(bool gas_enable, struct bme680_field_data *meas_data, int8_t ambient_temp);
+
+#endif /* __MEAS_H__ */

include/stm32f030x6.h

@@ -365,8 +365,15 @@ typedef struct
 {
   __IO uint32_t CR1;      /*!< SPI Control register 1 (not used in I2S mode),       Address offset: 0x00 */
   __IO uint32_t CR2;      /*!< SPI Control register 2,                              Address offset: 0x04 */
-  __IO uint32_t SR;       /*!< SPI Status register,                                 Address offset: 0x08 */
+  __IO uint32_t SR;		/*!< SPI Status register,                                 Address offset: 0x08 */
-  __IO uint32_t DR;       /*!< SPI data register,                                   Address offset: 0x0C */
+  union DR_ {
+  __IO uint16_t DR16;       /*!< SPI data register,                                   Address offset: 0x0C */
+  struct DR8_ {
+	__IO uint8_t DR8_1;
+	__IO uint8_t DR8_2;
+  } DR8;
+  } DR;
+  __IO uint16_t DR_DUMMY;
   __IO uint32_t CRCPR;    /*!< SPI CRC polynomial register (not used in I2S mode),  Address offset: 0x10 */
   __IO uint32_t RXCRCR;   /*!< SPI Rx CRC register (not used in I2S mode),          Address offset: 0x14 */
   __IO uint32_t TXCRCR;   /*!< SPI Tx CRC register (not used in I2S mode),          Address offset: 0x18 */

lcd.c

@@ -0,0 +1,209 @@
+#include <lcd.h>
+#include <delay.h>
+
+static void lcd_port_clear(void)
+{
+	LCD_DPORT->ODR &= ~(LCD_E_MASK);
+	LCD_DPORT->ODR &= ~(LCD_DATA_MASK | LCD_RS_MASK | LCD_E_MASK);
+}
+
+static void lcd_enable(void)
+{
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	LCD_DPORT->ODR |= LCD_E_MASK;
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	LCD_DPORT->ODR &= ~LCD_E_MASK;
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+}
+
+static void lcd_out(uint8_t data)
+{
+	LCD_DPORT->ODR &= ~(LCD_DATA_MASK);
+	LCD_DPORT->ODR |= (data << LCD_DATA_BIT_OFFSET) & LCD_DATA_MASK;
+}
+
+static void lcd_data(uint8_t data)
+{
+	lcd_port_clear();
+	LCD_DPORT->ODR |= LCD_RS_MASK;
+	lcd_out((data>>4) & 0xFU);
+	lcd_enable();
+	lcd_out(data & 0xFU);
+	lcd_enable();
+	delay_ms(1);
+}
+
+static void lcd_command(uint8_t data)
+{
+	lcd_port_clear();
+	lcd_out((data>>4) & 0xFU);
+	lcd_enable();
+	lcd_out(data & 0xFU);
+	lcd_enable();
+	delay_ms(1);
+}
+
+#define LCD_DDADR_LINE1         0x00
+#define LCD_DDADR_LINE2         0x40
+#define LCD_DDADR_LINE3         0x10
+#define LCD_DDADR_LINE4         0x50
+
+// Clear Display -------------- 0b00000001
+#define LCD_CLEAR_DISPLAY       0x01
+
+// Cursor Home ---------------- 0b0000001x
+#define LCD_CURSOR_HOME         0x02
+
+// Set Entry Mode ------------- 0b000001xx
+#define LCD_SET_ENTRY           0x04
+
+#define LCD_ENTRY_DECREASE      0x00
+#define LCD_ENTRY_INCREASE      0x02
+#define LCD_ENTRY_NOSHIFT       0x00
+#define LCD_ENTRY_SHIFT         0x01
+
+// Set Display ---------------- 0b00001xxx
+#define LCD_SET_DISPLAY         0x08
+
+#define LCD_DISPLAY_OFF         0x00
+#define LCD_DISPLAY_ON          0x04
+#define LCD_CURSOR_OFF          0x00
+#define LCD_CURSOR_ON           0x02
+#define LCD_BLINKING_OFF        0x00
+#define LCD_BLINKING_ON         0x01
+
+// Set Shift ------------------ 0b0001xxxx
+#define LCD_SET_SHIFT           0x10
+
+#define LCD_CURSOR_MOVE         0x00
+#define LCD_DISPLAY_SHIFT       0x08
+#define LCD_SHIFT_LEFT          0x00
+#define LCD_SHIFT_RIGHT         0x04
+
+// Set Function --------------- 0b001xxxxx
+#define LCD_SET_FUNCTION        0x20
+
+#define LCD_FUNCTION_4BIT       0x00
+#define LCD_FUNCTION_8BIT       0x10
+#define LCD_FUNCTION_1LINE      0x00
+#define LCD_FUNCTION_2LINE      0x08
+#define LCD_FUNCTION_5X7        0x00
+#define LCD_FUNCTION_5X10       0x04
+
+#define LCD_SOFT_RESET          0x30
+
+// Set CG RAM Address --------- 0b01xxxxxx  (Character Generator RAM)
+#define LCD_SET_CGADR           0x40
+
+#define LCD_GC_CHAR0            0
+#define LCD_GC_CHAR1            1
+#define LCD_GC_CHAR2            2
+#define LCD_GC_CHAR3            3
+#define LCD_GC_CHAR4            4
+#define LCD_GC_CHAR5            5
+#define LCD_GC_CHAR6            6
+#define LCD_GC_CHAR7            7
+
+// Set DD RAM Address --------- 0b1xxxxxxx  (Display Data RAM)
+#define LCD_SET_DDADR           0x80
+
+void lcd_clear(void)
+{
+	lcd_command(LCD_CLEAR_DISPLAY);
+	delay_ms(3);
+}
+
+void lcd_home( void )
+{
+	lcd_command(LCD_CURSOR_HOME);
+	delay_ms(3);
+}
+
+void lcd_setcursor( uint8_t x, uint8_t y )
+{
+	uint8_t data;
+
+	switch (y)
+	{
+	case 0:    // 1. Zeile
+		data = LCD_SET_DDADR + LCD_DDADR_LINE1 + x;
+		break;
+
+	case 1:    // 2. Zeile
+		data = LCD_SET_DDADR + LCD_DDADR_LINE2 + x;
+		break;
+
+	case 2:    // 3. Zeile
+		data = LCD_SET_DDADR + LCD_DDADR_LINE3 + x;
+		break;
+
+	case 3:    // 4. Zeile
+		data = LCD_SET_DDADR + LCD_DDADR_LINE4 + x;
+		break;
+
+	default:
+		return;                                   // für den Fall einer falschen Zeile
+	}
+
+	lcd_command(data);
+}
+
+void lcd_string(const char *data)
+{
+	while(*data != '\0') {
+		lcd_data((uint8_t)*data++);
+	}
+}
+
+void lcd_init(void)
+{
+	int i;
+
+	lcd_port_clear();
+	delay_ms(100);
+	LCD_DPORT->ODR |= (0x3 << LCD_DATA_BIT_OFFSET);
+
+	for (i = 0; i < 3; i++) {
+		lcd_enable();
+		delay_ms(5);
+	}
+
+	// Set 4 Bit mode
+	lcd_port_clear();
+	LCD_DPORT->ODR |= (0x2<<LCD_DATA_BIT_OFFSET);
+	lcd_enable();
+	delay_ms(2);
+
+	// 4-bit Modus / 2 Zeilen / 5x7
+	lcd_command( LCD_SET_FUNCTION |
+		     LCD_FUNCTION_4BIT |
+		     LCD_FUNCTION_2LINE |
+		     LCD_FUNCTION_5X7 );
+
+	// Display ein / Cursor aus / Blinken aus
+	lcd_command( LCD_SET_DISPLAY |
+		     LCD_DISPLAY_ON |
+		     LCD_CURSOR_OFF |
+		     LCD_BLINKING_OFF);
+
+	// Cursor inkrement / kein Scrollen
+	lcd_command( LCD_SET_ENTRY |
+		     LCD_ENTRY_INCREASE |
+		     LCD_ENTRY_NOSHIFT );
+
+	lcd_clear();
+}
+
+

main.c

@@ -1,27 +1,136 @@
 #include <stm32f0xx.h>
-#include "bme680-driver-fork/bme680.h"
+#include <delay.h>
+#include <lcd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <meas.h>
+
 
 unsigned int i = 0x12345678;
 unsigned char c = 2;
 
-#define OUTPUT(pin)  (0x01 << (pin * 2))
+#define OUTPUT(pin)  (0x01U << (pin * 2))
+#define PULLUP(pin)	(0x1U << (pin* 2))
 #define ALTFUNC(pin) ((0x2) << (pin * 2))
 #define PINMASK(pin) ((0x3) << (pin * 2))
 #define SETAF(PORT,PIN,AF)  PORT->AFR[(PIN < 8 ? 0 : 1)] |= AF << ((PIN < 8 ? PIN : (PIN - 8)) * 4)
 
+static void setup_hw(void)
+{
+	RCC->AHBENR |= RCC_AHBENR_GPIOFEN | RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
+	RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
+
+	GPIOA->MODER |= OUTPUT(4) | ALTFUNC(5) | ALTFUNC(7) | ALTFUNC(6) | OUTPUT(0) | OUTPUT(1) | OUTPUT(2) | OUTPUT(3) | OUTPUT(9) | OUTPUT(10);
+	SETAF(GPIOA, 5, 0);
+	SETAF(GPIOA, 6, 0);
+	SETAF(GPIOA, 7, 0);
+	GPIOF->MODER |= OUTPUT(0);
+	GPIOF->PUPDR |= PULLUP(1);
+	GPIOF->ODR &= ~(1<<0);
+
+	GPIOB->MODER |= OUTPUT(1);
+	GPIOB->ODR &= ~(1<<1);
+
+
+	GPIOA->ODR |= (1<<4);
+	SPI1->CR1 = SPI_CR1_BR_2 | SPI_CR1_MSTR | SPI_CR1_SSM | SPI_CR1_SSI;
+	SPI1->CR1 |= SPI_CR1_SPE;
+
+	/* Configure Systick for 1ms interval */
+	SysTick_Config(8000/*00*/);
+	lcd_init();
+}
+
+static void format(int temp, char *string, uint8_t decimals, uint8_t digits)
+{
+	int digit;
+
+	for (digit = decimals+digits; digit >= 1; digit--) {
+		if (digit >= digits+1)
+			string[digit] = (temp % 10) + 0x30;
+		else
+			string[digit-1] = (temp % 10) + 0x30;
+
+		temp /= 10;
+	}
+
+	string[digits] = '.';
+	string[decimals+digits+1] = 0x00;
+}
+
+static void print_data_to_display(int32_t temp, uint32_t pressure, uint32_t humidity)
+{
+	char lcd_line[17];
+	lcd_clear();
+	lcd_home();
+	lcd_string("Temp: ");
+	format(temp, lcd_line, 2, 2);
+	lcd_string(lcd_line);
+	lcd_setcursor(0, 1);
+	lcd_string("RH: ");
+	format((int)humidity, lcd_line, 3, 2);
+	lcd_string(lcd_line);
+	lcd_setcursor(0, 2);
+	lcd_string("Pr.: ");
+	format((int)pressure, lcd_line, 2, 4);
+	lcd_string(lcd_line);
+
+}
 
 int main(void) {
-	RCC->AHBENR |= RCC_AHBENR_GPIOFEN;
+	struct bme680_field_data data;
-	GPIOF->MODER |= OUTPUT(0);
+	int8_t ambient_temp = 25;
-	GPIOF->ODR |= (1<<0);
+	int32_t temp_calib;
+	int i;
 
-	SysTick_Config(800000);
+	setup_hw();
-	while(1) {
+	meas_init_without_gas();
-		i++;
+
+	temp_calib = 0;
+	lcd_home();
+	lcd_string("Initializing...");
+	for (i = 0; i < 8; i++) {
+		i = 0;
+		delay_ms(1000);
+		if (meas_do(false, &data, ambient_temp)) {
+			/* Measurement failed. retry */
+			i--;
+			continue;
+		}
+		temp_calib += data.temperature;
+		ambient_temp = (int8_t)(data.temperature / 100);
+
+		print_data_to_display(data.temperature, data.pressure, data.humidity);
 	}
+	temp_calib /= 8;
+
+
+}
+
+void HardFault_Handler(void)
+{
+	while(1);
 }
 
 void SysTick_Handler(void) {
+	static int internal_tick = 0;
+	static volatile uint8_t backlight_counter;
 	/* Blink bad air LED */
-	GPIOF->ODR ^= (1<<0);
+	tick++;
+	internal_tick++;
+
+	if (!(GPIOF->IDR & (1U<<1))) {
+		backlight_counter = 30;
+		GPIOB->ODR |= (1U<<1);
+	}
+
+	if (internal_tick > 200) {
+		internal_tick = 0;
+		if (backlight_counter > 0) {
+			backlight_counter--;
+		} else if (backlight_counter == 0) {
+			GPIOB->ODR &= ~(1U<<1);
+		}
+		//GPIOF->ODR ^= (1<<0);
+	}
 }

meas.c

@@ -0,0 +1,131 @@
+#include <meas.h>
+#include <stm32f0xx.h>
+#include <delay.h>
+#include "bme680-driver-fork/bme680.h"
+
+
+static struct bme680_dev gas_sensor;
+
+static uint8_t spi_transfer(uint8_t out_data)
+{
+	while(SPI1->SR & SPI_SR_BSY);
+	SPI1->DR.DR8.DR8_1 = out_data;
+	__DSB();
+	while((SPI1->SR & SPI_SR_BSY) || !(SPI1->SR & SPI_SR_TXE));
+	return (uint8_t)(SPI1->DR.DR8.DR8_1 & 0xFF);
+}
+
+static int8_t write_spi(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len)
+{
+	(void)dev_id;
+	int i;
+
+	GPIOA->ODR &= ~(1U<<4);
+
+	spi_transfer(reg_addr);
+
+	for (i = 0; i < len; i++)
+		spi_transfer(reg_data[i]);
+
+	GPIOA->ODR |= (1U<<4);
+
+	return 0;
+}
+
+
+static int8_t read_spi(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len)
+{
+	(void)dev_id;
+	int i;
+
+	GPIOA->ODR &= ~(1U<<4);
+
+	spi_transfer(reg_addr);
+
+	for (i = 0; i < len; i++)
+		reg_data[i] = spi_transfer(0x00);
+
+	GPIOA->ODR |= (1U<<4);
+
+	return 0;
+}
+
+int meas_init_without_gas(void)
+{
+	int ret;
+
+	gas_sensor.dev_id = 0;
+	gas_sensor.intf = BME680_SPI_INTF;
+	gas_sensor.read = read_spi;
+	gas_sensor.write = write_spi;
+	gas_sensor.delay_ms = delay_ms;
+
+	gas_sensor.amb_temp = 25;
+
+	ret = (int)bme680_init(&gas_sensor);
+	if (ret)
+		return ret;
+
+	uint8_t set_required_settings;
+
+	/* Set the temperature, pressure and humidity settings */
+	gas_sensor.tph_sett.os_hum = BME680_OS_8X;
+	gas_sensor.tph_sett.os_pres = BME680_OS_8X;
+	gas_sensor.tph_sett.os_temp = BME680_OS_8X;
+	gas_sensor.tph_sett.filter = BME680_FILTER_SIZE_7;
+
+	/* Set the remaining gas sensor settings and link the heating profile */
+	gas_sensor.gas_sett.run_gas = BME680_DISABLE_GAS_MEAS;
+
+	/* Create a ramp heat waveform in 3 steps */
+	gas_sensor.gas_sett.heatr_temp = 320; /* degree Celsius */
+	gas_sensor.gas_sett.heatr_dur = 150; /* milliseconds */
+
+	/* Select the power mode */
+	/* Must be set before writing the sensor configuration */
+	gas_sensor.power_mode = BME680_FORCED_MODE;
+
+	/* Set the required sensor settings needed */
+	set_required_settings = BME680_OST_SEL | BME680_OSP_SEL | BME680_OSH_SEL | BME680_FILTER_SEL | BME680_GAS_SENSOR_SEL;
+
+	/* Set the desired sensor configuration */
+	ret = (int)bme680_set_sensor_settings(set_required_settings,&gas_sensor);
+
+	return ret;
+}
+
+int meas_do(bool gas_enable, struct bme680_field_data *meas_data, int8_t ambient_temp)
+{
+	uint16_t meas_duration;
+	int res;
+
+	if (!meas_data)
+		return -100;
+
+	gas_sensor.power_mode = BME680_FORCED_MODE;
+
+	gas_sensor.gas_sett.run_gas = (gas_enable ? BME680_RUN_GAS_ENABLE : BME680_RUN_GAS_DISABLE);
+
+	gas_sensor.amb_temp = ambient_temp;
+
+	res = (int)bme680_set_sensor_settings(BME680_OST_SEL | BME680_OSP_SEL | BME680_OSH_SEL |
+					      BME680_FILTER_SEL | BME680_GAS_SENSOR_SEL,
+					      &gas_sensor);
+
+	/* Set the power mode */
+	res = (int)bme680_set_sensor_mode(&gas_sensor);
+	if (res)
+		return res;
+
+	bme680_get_profile_dur(&meas_duration, &gas_sensor);
+	delay_ms(meas_duration);
+
+	res = (int)bme680_get_sensor_data(meas_data, &gas_sensor);
+	if (res)
+		return res;
+
+	gas_sensor.power_mode = BME680_SLEEP_MODE;
+	res = (int)bme680_set_sensor_mode(&gas_sensor);
+
+	return res;
+}