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This commit is contained in:
Artur Gurgul 2025-09-16 09:38:00 -05:00
parent 71381bb467
commit 793eb33f67
4 changed files with 142 additions and 112 deletions
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7
CMakeLists.txt
View file

@ -5,4 +5,9 @@ cmake_minimum_required(VERSION 3.16)
set(EXTRA_COMPONENT_DIRS "${CMAKE_CURRENT_LIST_DIR}/components")
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(bme680_esp8266)
project(bme680_esp8266 C)
# Force the app to link as C (prevents pulling libstdc++)
idf_build_get_property(APP_TARGET EXECUTABLE) # provided by IDF's CMake
set_target_properties(${APP_TARGET} PROPERTIES LINKER_LANGUAGE C)

6
Makefile
View file

@ -1,8 +1,14 @@
.DEFAULT_GOAL := build
clean:
idf.py fullclean
rm -rf ./main/build
rm -rf ./components/bme68x/build
rm -rf ./build
build:
# idf.py reconfigure
# idf.py defconfig
idf.py build

193
main/bme680_esp8266.c
View file

@ -1,126 +1,145 @@
// #include <stdio.h>
// void app_main(void)
// {
// }
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2c.h"
#include "bme680.h"
#include "bme68x.h"
/* ----- I2C pins (ESP-01S: SDA=GPIO0, SCL=GPIO2) ----- */
#define I2C_PORT I2C_NUM_0
#define I2C_SDA_PIN 0 // GPIO0
#define I2C_SCL_PIN 2 // GPIO2
#define I2C_FREQ_HZ 100000
#define BME680_ADDR BME680_I2C_ADDR_PRIMARY // 0x76 (SDO=GND)
// #define BME680_ADDR BME680_I2C_ADDR_SECONDARY // 0x77 (SDO=VCC)
#define I2C_SDA_PIN 0
#define I2C_SCL_PIN 2
#define I2C_TIMEOUT_MS 1000
// --- I2C helpers (ESP-IDF style) ---
static int8_t i2c_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *data, uint16_t len) {
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (dev_id << 1) | I2C_MASTER_WRITE, true);
i2c_master_write_byte(cmd, reg_addr, true);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (dev_id << 1) | I2C_MASTER_READ, true);
if (len > 1) {
i2c_master_read(cmd, data, len - 1, I2C_MASTER_ACK);
}
i2c_master_read_byte(cmd, data + len - 1, I2C_MASTER_NACK);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_PORT, cmd, pdMS_TO_TICKS(1000));
i2c_cmd_link_delete(cmd);
return (ret == ESP_OK) ? BME680_OK : BME680_E_COM_FAIL;
}
/* BME68x address: SDO=GND -> LOW(0x76), SDO=VCC -> HIGH(0x77) */
#define BME68X_ADDR BME68X_I2C_ADDR_LOW
static int8_t i2c_write(uint8_t dev_id, uint8_t reg_addr, const uint8_t *data, uint16_t len) {
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (dev_id << 1) | I2C_MASTER_WRITE, true);
i2c_master_write_byte(cmd, reg_addr, true);
i2c_master_write(cmd, (uint8_t*)data, len, true);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_PORT, cmd, pdMS_TO_TICKS(1000));
i2c_cmd_link_delete(cmd);
return (ret == ESP_OK) ? BME680_OK : BME680_E_COM_FAIL;
}
static void delay_ms(uint32_t period_ms) { vTaskDelay(pdMS_TO_TICKS(period_ms)); }
static void i2c_init(void) {
/* --------- ESP8266 I2C init (note: clk_stretch_tick field) --------- */
static void i2c_init(void)
{
i2c_config_t conf = {
.mode = I2C_MODE_MASTER,
.sda_io_num = I2C_SDA_PIN,
.scl_io_num = I2C_SCL_PIN,
.sda_pullup_en = GPIO_PULLUP_ENABLE,
.scl_pullup_en = GPIO_PULLUP_ENABLE,
.master.clk_speed = I2C_FREQ_HZ,
.clk_stretch_tick = 300, // reasonable default on ESP8266
};
i2c_param_config(I2C_PORT, &conf);
i2c_driver_install(I2C_PORT, conf.mode, 0, 0, 0);
i2c_driver_install(I2C_PORT, conf.mode); // ESP8266 signature: (port, mode)
}
void app_main(void) {
/* ------------- BME68x I2C read/write helpers ------------- */
static int8_t bme68x_i2c_read(uint8_t reg, uint8_t *data, uint32_t len, void *intf_ptr)
{
uint8_t addr = *(uint8_t *)intf_ptr; // 7-bit address
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (addr << 1) | I2C_MASTER_WRITE, true);
i2c_master_write_byte(cmd, reg, true);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (addr << 1) | I2C_MASTER_READ, true);
if (len > 1) i2c_master_read(cmd, data, len - 1, I2C_MASTER_ACK);
i2c_master_read_byte(cmd, data + len - 1, I2C_MASTER_NACK);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_PORT, cmd, I2C_TIMEOUT_MS / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
return (ret == ESP_OK) ? BME68X_OK : BME68X_E_COM_FAIL;
}
static int8_t bme68x_i2c_write(uint8_t reg, const uint8_t *data, uint32_t len, void *intf_ptr)
{
uint8_t addr = *(uint8_t *)intf_ptr;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (addr << 1) | I2C_MASTER_WRITE, true);
i2c_master_write_byte(cmd, reg, true);
i2c_master_write(cmd, (uint8_t*)data, len, true);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_PORT, cmd, I2C_TIMEOUT_MS / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
return (ret == ESP_OK) ? BME68X_OK : BME68X_E_COM_FAIL;
}
static void bme68x_delay_us(uint32_t period_us, void *intf_ptr)
{
(void)intf_ptr;
/* Delay granularity is ms on FreeRTOS; round up */
vTaskDelay((period_us + 999) / 1000 / portTICK_PERIOD_MS);
}
/* ----------------------- App ----------------------- */
void app_main(void)
{
i2c_init();
struct bme680_dev dev = {0};
dev.dev_id = BME680_ADDR;
dev.intf = BME680_I2C_INTF;
dev.read = i2c_read;
dev.write = i2c_write;
dev.delay_ms = delay_ms;
struct bme68x_dev dev = {0};
uint8_t i2c_addr = BME68X_ADDR;
if (bme680_init(&dev) != BME680_OK) {
printf("BME680 init failed\n");
dev.intf = BME68X_I2C_INTF;
dev.read = bme68x_i2c_read;
dev.write = bme68x_i2c_write;
dev.delay_us = bme68x_delay_us;
dev.intf_ptr = &i2c_addr;
if (bme68x_init(&dev) != BME68X_OK) {
printf("BME68x init failed\n");
return;
}
// Oversampling / filter
dev.tph_sett.os_hum = BME680_OS_2X;
dev.tph_sett.os_pres = BME680_OS_4X;
dev.tph_sett.os_temp = BME680_OS_8X;
dev.tph_sett.filter = BME680_FILTER_SIZE_3;
/* Oversampling + filter */
struct bme68x_conf conf = {
.os_hum = BME68X_OS_2X,
.os_temp = BME68X_OS_8X,
.os_pres = BME68X_OS_4X,
.filter = BME68X_FILTER_SIZE_3,
.odr = BME68X_ODR_NONE
};
if (bme68x_set_conf(&conf, &dev) != BME68X_OK) {
printf("set_conf failed\n");
return;
}
// Gas sensor
dev.gas_sett.run_gas = BME680_ENABLE_GAS_MEAS;
dev.gas_sett.heatr_temp = 320; // °C
dev.gas_sett.heatr_dur = 150; // ms
uint8_t set_required_settings = BME680_OST_SEL | BME680_OSP_SEL |
BME680_OSH_SEL | BME680_FILTER_SEL |
BME680_GAS_SENSOR_SEL;
if (bme680_set_sensor_settings(set_required_settings, &dev) != BME680_OK) {
printf("Sensor settings failed\n");
/* Gas heater config for one-shot */
struct bme68x_heatr_conf hconf = {
.enable = BME68X_ENABLE,
.heatr_temp = 320, // °C
.heatr_dur = 150 // ms
};
if (bme68x_set_heatr_conf(BME68X_FORCED_MODE, &hconf, &dev) != BME68X_OK) {
printf("set_heatr_conf failed\n");
return;
}
while (1) {
// Force mode, one-shot
if (bme680_set_sensor_mode(&dev) != BME680_OK) {
printf("Set mode failed\n");
if (bme68x_set_op_mode(BME68X_FORCED_MODE, &dev) != BME68X_OK) {
printf("set_op_mode failed\n");
vTaskDelay(pdMS_TO_TICKS(1000));
continue;
}
// Wait for measurement time
uint16_t meas_period;
bme680_get_profile_dur(&meas_period, &dev);
vTaskDelay(pdMS_TO_TICKS(meas_period));
/* Calculate measurement duration and wait */
uint32_t dur_us = bme68x_get_meas_dur(BME68X_FORCED_MODE, &conf, &dev) + (hconf.heatr_dur * 1000);
bme68x_delay_us(dur_us, NULL);
struct bme68x_data data;
uint8_t n_fields = 0;
if (bme68x_get_data(BME68X_FORCED_MODE, &data, &n_fields, &dev) == BME68X_OK && n_fields > 0) {
/* Note: API returns fixed-point values; divide per defs */
float temp_c = data.temperature / 100.0f; // °C
float press_hpa = data.pressure / 100.0f; // hPa
float hum_pct = data.humidity / 1000.0f; // %RH
float gas_kohm = data.gas_resistance / 1000.0f;
struct bme680_field_data data;
if (bme680_get_sensor_data(&data, &dev) == BME680_OK) {
printf("T=%.2f °C RH=%.2f %% P=%.2f hPa Gas=%.2f kΩ\n",
data.temperature / 100.0f,
data.humidity / 1000.0f,
data.pressure / 100.0f,
data.gas_resistance / 1000.0f);
temp_c, hum_pct, press_hpa, gas_kohm);
} else {
printf("Read failed\n");
printf("read failed\n");
}
vTaskDelay(pdMS_TO_TICKS(2000));

48
sdkconfig
View file

@ -31,12 +31,12 @@ CONFIG_ESPTOOLPY_BAUD_115200B=y
CONFIG_ESPTOOLPY_BAUD_OTHER_VAL=115200
CONFIG_ESPTOOLPY_BAUD=115200
CONFIG_ESPTOOLPY_COMPRESSED=y
# CONFIG_ESPTOOLPY_FLASHMODE_QIO is not set
CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
# CONFIG_ESPTOOLPY_FLASHMODE_QOUT is not set
CONFIG_ESPTOOLPY_FLASHMODE_DIO=y
# CONFIG_ESPTOOLPY_FLASHMODE_DIO is not set
# CONFIG_ESPTOOLPY_FLASHMODE_DOUT is not set
CONFIG_ESPTOOLPY_FLASHMODE="dio"
CONFIG_SPI_FLASH_MODE=0x2
CONFIG_SPI_FLASH_MODE=0x0
# CONFIG_ESPTOOLPY_FLASHFREQ_80M is not set
CONFIG_ESPTOOLPY_FLASHFREQ_40M=y
# CONFIG_ESPTOOLPY_FLASHFREQ_26M is not set
@ -147,17 +147,17 @@ CONFIG_ESP8266_PHY_MAX_WIFI_TX_POWER=20
# CONFIG_ESP8266_HSPI_HIGH_THROUGHPUT is not set
CONFIG_ESP_ERR_TO_NAME_LOOKUP=y
CONFIG_ESP_SYSTEM_EVENT_QUEUE_SIZE=32
CONFIG_ESP_SYSTEM_EVENT_TASK_STACK_SIZE=2304
CONFIG_ESP_SYSTEM_EVENT_TASK_STACK_SIZE=2048
CONFIG_ESP_MAIN_TASK_STACK_SIZE=3584
CONFIG_ESP_TIMER_TASK_STACK_SIZE=3584
CONFIG_ESP_CONSOLE_UART_DEFAULT=y
# CONFIG_ESP_CONSOLE_UART_CUSTOM is not set
# CONFIG_ESP_CONSOLE_UART_NONE is not set
CONFIG_ESP_CONSOLE_UART_NUM=0
CONFIG_ESP_CONSOLE_UART_BAUDRATE=115200
CONFIG_ESP_CONSOLE_UART_BAUDRATE=74880
# CONFIG_ESP_UART0_SWAP_IO is not set
CONFIG_ESP_TASK_WDT=y
# CONFIG_ESP_TASK_WDT_PANIC is not set
CONFIG_ESP_TASK_WDT_PANIC=y
# CONFIG_ESP_TASK_WDT_TIMEOUT_13N is not set
# CONFIG_ESP_TASK_WDT_TIMEOUT_14N is not set
CONFIG_ESP_TASK_WDT_TIMEOUT_15N=y
@ -167,7 +167,7 @@ CONFIG_ESP_EVENT_POST_FROM_ISR=y
CONFIG_ESP_HTTP_CLIENT_ENABLE_HTTPS=y
# CONFIG_ESP_HTTP_CLIENT_ENABLE_BASIC_AUTH is not set
CONFIG_HTTP_BUF_SIZE=512
CONFIG_HTTPD_MAX_REQ_HDR_LEN=1024
CONFIG_HTTPD_MAX_REQ_HDR_LEN=512
CONFIG_HTTPD_MAX_URI_LEN=512
CONFIG_OTA_BUF_SIZE=256
# CONFIG_OTA_ALLOW_HTTP is not set
@ -225,8 +225,8 @@ CONFIG_FREERTOS_UNICORE=y
CONFIG_FREERTOS_NO_AFFINITY=0x7FFFFFFF
CONFIG_FREERTOS_HZ=100
CONFIG_FREERTOS_MAX_HOOK=2
CONFIG_FREERTOS_IDLE_TASK_STACKSIZE=1536
CONFIG_FREERTOS_ISR_STACKSIZE=1536
CONFIG_FREERTOS_IDLE_TASK_STACKSIZE=1024
CONFIG_FREERTOS_ISR_STACKSIZE=512
# CONFIG_FREERTOS_EXTENED_HOOKS is not set
CONFIG_FREERTOS_GLOBAL_DATA_LINK_IRAM=y
# CONFIG_FREERTOS_CODE_LINK_TO_IRAM is not set
@ -236,7 +236,7 @@ CONFIG_TASK_SWITCH_FASTER=y
# CONFIG_ENABLE_FREERTOS_SLEEP is not set
# CONFIG_FREERTOS_USE_TRACE_FACILITY is not set
# CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS is not set
# CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK is not set
CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK=y
# CONFIG_HEAP_DISABLE_IRAM is not set
# CONFIG_HEAP_TRACING is not set
CONFIG_LIBSODIUM_USE_MBEDTLS_SHA=y
@ -247,7 +247,7 @@ CONFIG_LOG_DEFAULT_LEVEL_INFO=y
# CONFIG_LOG_DEFAULT_LEVEL_DEBUG is not set
# CONFIG_LOG_DEFAULT_LEVEL_VERBOSE is not set
CONFIG_LOG_DEFAULT_LEVEL=3
# CONFIG_LOG_COLORS is not set
CONFIG_LOG_COLORS=y
# CONFIG_LOG_SET_LEVEL is not set
CONFIG_LWIP_LOCAL_HOSTNAME="espressif"
CONFIG_LWIP_DNS_SUPPORT_MDNS_QUERIES=y
@ -282,11 +282,11 @@ CONFIG_LWIP_LOOPBACK_MAX_PBUFS=8
CONFIG_LWIP_MAX_ACTIVE_TCP=16
CONFIG_LWIP_MAX_LISTENING_TCP=16
CONFIG_LWIP_TCP_MAXRTX=12
CONFIG_LWIP_TCP_SYNMAXRTX=12
CONFIG_LWIP_TCP_SYNMAXRTX=6
CONFIG_LWIP_TCP_MSS=1440
CONFIG_LWIP_TCP_TMR_INTERVAL=250
CONFIG_LWIP_TCP_MSL=60000
CONFIG_LWIP_TCP_SND_BUF_DEFAULT=5760
CONFIG_LWIP_TCP_SND_BUF_DEFAULT=2880
CONFIG_LWIP_TCP_WND_DEFAULT=5760
CONFIG_LWIP_TCP_RECVMBOX_SIZE=6
CONFIG_LWIP_TCP_QUEUE_OOSEQ=y
@ -295,10 +295,10 @@ CONFIG_LWIP_TCP_QUEUE_OOSEQ=y
CONFIG_LWIP_TCP_OVERSIZE_MSS=y
# CONFIG_LWIP_TCP_OVERSIZE_QUARTER_MSS is not set
# CONFIG_LWIP_TCP_OVERSIZE_DISABLE is not set
CONFIG_LWIP_TCP_RTO_TIME=1500
CONFIG_LWIP_TCP_RTO_TIME=3000
CONFIG_LWIP_MAX_UDP_PCBS=16
CONFIG_LWIP_UDP_RECVMBOX_SIZE=6
CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=3072
CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=2048
CONFIG_LWIP_TCPIP_TASK_AFFINITY_NO_AFFINITY=y
# CONFIG_LWIP_TCPIP_TASK_AFFINITY_CPU0 is not set
CONFIG_LWIP_TCPIP_TASK_AFFINITY=0x7FFFFFFF
@ -308,7 +308,7 @@ CONFIG_LWIP_IPV6_ND6_NUM_NEIGHBORS=5
# CONFIG_LWIP_MULTICAST_PING is not set
# CONFIG_LWIP_BROADCAST_PING is not set
CONFIG_LWIP_MAX_RAW_PCBS=16
CONFIG_LWIP_IPV6=y
# CONFIG_LWIP_IPV6 is not set
CONFIG_LWIP_DHCP_MAX_NTP_SERVERS=1
CONFIG_LWIP_SNTP_UPDATE_DELAY=3600000
CONFIG_LWIP_ESP_LWIP_ASSERT=y
@ -395,7 +395,7 @@ CONFIG_MQTT_TRANSPORT_WEBSOCKET_SECURE=y
CONFIG_NEWLIB_STDOUT_LINE_ENDING_CRLF=y
# CONFIG_NEWLIB_STDOUT_LINE_ENDING_LF is not set
# CONFIG_NEWLIB_STDOUT_LINE_ENDING_CR is not set
# CONFIG_NEWLIB_NANO_FORMAT is not set
CONFIG_NEWLIB_NANO_FORMAT=y
# CONFIG_OPENSSL_DEBUG is not set
CONFIG_OPENSSL_ASSERT_DO_NOTHING=y
# CONFIG_OPENSSL_ASSERT_EXIT is not set
@ -443,9 +443,9 @@ CONFIG_WPA_MBEDTLS_CRYPTO=y
# Deprecated options for backward compatibility
CONFIG_TARGET_PLATFORM="esp8266"
CONFIG_TOOLPREFIX="xtensa-lx106-elf-"
# CONFIG_FLASHMODE_QIO is not set
CONFIG_FLASHMODE_QIO=y
# CONFIG_FLASHMODE_QOUT is not set
CONFIG_FLASHMODE_DIO=y
# CONFIG_FLASHMODE_DIO is not set
# CONFIG_FLASHMODE_DOUT is not set
# CONFIG_MONITOR_BAUD_9600B is not set
# CONFIG_MONITOR_BAUD_57600B is not set
@ -474,10 +474,10 @@ CONFIG_CONSOLE_UART_DEFAULT=y
# CONFIG_CONSOLE_UART_CUSTOM is not set
# CONFIG_CONSOLE_UART_NONE is not set
CONFIG_CONSOLE_UART_NUM=0
CONFIG_CONSOLE_UART_BAUDRATE=115200
CONFIG_CONSOLE_UART_BAUDRATE=74880
# CONFIG_UART0_SWAP_IO is not set
CONFIG_TASK_WDT=y
# CONFIG_TASK_WDT_PANIC is not set
CONFIG_TASK_WDT_PANIC=y
CONFIG_TASK_WDT_TIMEOUT_S=15
CONFIG_MB_MASTER_TIMEOUT_MS_RESPOND=150
CONFIG_MB_MASTER_DELAY_MS_CONVERT=200
@ -499,10 +499,10 @@ CONFIG_ESP_GRATUITOUS_ARP=y
CONFIG_GARP_TMR_INTERVAL=60
CONFIG_TCPIP_RECVMBOX_SIZE=32
CONFIG_TCP_MAXRTX=12
CONFIG_TCP_SYNMAXRTX=12
CONFIG_TCP_SYNMAXRTX=6
CONFIG_TCP_MSS=1440
CONFIG_TCP_MSL=60000
CONFIG_TCP_SND_BUF_DEFAULT=5760
CONFIG_TCP_SND_BUF_DEFAULT=2880
CONFIG_TCP_WND_DEFAULT=5760
CONFIG_TCP_RECVMBOX_SIZE=6
CONFIG_TCP_QUEUE_OOSEQ=y
@ -511,7 +511,7 @@ CONFIG_TCP_OVERSIZE_MSS=y
# CONFIG_TCP_OVERSIZE_QUARTER_MSS is not set
# CONFIG_TCP_OVERSIZE_DISABLE is not set
CONFIG_UDP_RECVMBOX_SIZE=6
CONFIG_TCPIP_TASK_STACK_SIZE=3072
CONFIG_TCPIP_TASK_STACK_SIZE=2048
CONFIG_TCPIP_TASK_AFFINITY_NO_AFFINITY=y
# CONFIG_TCPIP_TASK_AFFINITY_CPU0 is not set
CONFIG_TCPIP_TASK_AFFINITY=0x7FFFFFFF