--- /dev/null
+BME280 I2C Barometric, humidity and temperature sensor example
+
+Copyright 2016 Nathael Pajani <nathael.pajani@ed3l.fr>
+
+
+/* ****************************************************************************
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+This example shows the support of the BME280 I2C sensor.
+
+Periodic conversions (compensated values) are sent on UART0 using the
+following frame format :
+P: 986 hPa, T: 29,6 degC, H: 44,2 rH
+
+
--- /dev/null
+/****************************************************************************
+ * i2c_bme280/main.c
+ *
+ * BME280 I2C Barometric, humidity and temperature sensor example
+ *
+ * Copyright 2016 Nathael Pajani <nathael.pajani@ed3l.fr>
+ *
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+
+#include "lib/stdint.h"
+#include "core/system.h"
+#include "core/systick.h"
+#include "core/watchdog.h"
+#include "core/pio.h"
+#include "lib/stdio.h"
+#include "lib/errno.h"
+#include "drivers/i2c.h"
+#include "drivers/serial.h"
+#include "drivers/gpio.h"
+
+#include "extdrv/bme280_humidity_sensor.h"
+
+
+#define MODULE_VERSION 0x01
+#define MODULE_NAME "E-Xanh Gardener"
+
+
+#define SELECTED_FREQ FREQ_SEL_36MHz
+
+
+
+
+/***************************************************************************** */
+/* Pins configuration */
+/* Pins blocks are passed to set_pins() for pins configuration.
+ * Unused pin blocks can be removed safely with the corresponding set_pins() call
+ * All pins blocks may be safelly merged in a single block for single set_pins() call..
+ */
+const struct pio_config common_pins[] = {
+ /* UART 0 */
+ { LPC_GPIO_0_0, LPC_UART0_RX, 0 },
+ { LPC_GPIO_0_4, LPC_UART0_TX, 0 },
+ /* I2C 0 */
+ { LPC_I2C0_SCL_PIO_0_10, LPC_FIXED, 0 },
+ { LPC_I2C0_SDA_PIO_0_11, LPC_FIXED, 0 },
+ ARRAY_LAST_PIO,
+};
+
+
+
+
+/***************************************************************************** */
+/* Sensor */
+
+/* Note : 8bits address */
+#define BME280_ADDR 0xEC
+struct bme280_sensor_config bme280_sensor = {
+ .bus_num = I2C0,
+ .addr = BME280_ADDR,
+ .humidity_oversampling = BME280_OS_x16,
+ .temp_oversampling = BME280_OS_x16,
+ .pressure_oversampling = BME280_OS_x16,
+ .mode = BME280_NORMAL,
+ .standby_len = BME280_SB_62ms,
+ .filter_coeff = BME280_FILT_OFF,
+};
+
+void sensor_config(int uart_num)
+{
+ int ret = 0;
+
+ ret = bme280_configure(&bme280_sensor);
+ if (ret != 0) {
+ uprintf(uart_num, "Sensor config error: %d\n", ret);
+ }
+}
+
+void sensor_display(int uart_num)
+{
+ uint32_t pressure = 0, temp = 0;
+ uint16_t humidity = 0;
+ int ret = 0;
+
+ ret = bme280_sensor_read(&bme280_sensor, &pressure, &temp, &humidity);
+ if (ret != 0) {
+ uprintf(uart_num, "Sensor read error: %d\n", ret);
+ } else {
+ int comp_temp = 0;
+ uint32_t comp_pressure = 0;
+ uint32_t comp_humidity = 0;
+
+ comp_temp = bme280_compensate_temperature(&bme280_sensor, temp) / 10;
+ comp_pressure = bme280_compensate_pressure(&bme280_sensor, pressure) / 100;
+ comp_humidity = bme280_compensate_humidity(&bme280_sensor, humidity) / 10;
+ uprintf(uart_num, "P: %d hPa, T: %d,%02d degC, H: %d,%d rH\n",
+ comp_pressure,
+ comp_temp / 10, (comp_temp > 0) ? (comp_temp % 10) : ((-comp_temp) % 10),
+ comp_humidity / 10, comp_humidity % 10);
+ }
+}
+
+
+/***************************************************************************** */
+void system_init()
+{
+ system_set_default_power_state();
+ clock_config(SELECTED_FREQ);
+ set_pins(common_pins);
+ gpio_on();
+ /* System tick timer MUST be configured and running in order to use the sleeping
+ * functions */
+ systick_timer_on(1); /* 1ms */
+ systick_start();
+}
+
+/* Define our fault handler. This one is not mandatory, the dummy fault handler
+ * will be used when it's not overridden here.
+ * Note : The default one does a simple infinite loop. If the watchdog is deactivated
+ * the system will hang.
+ */
+void fault_info(const char* name, uint32_t len)
+{
+ uprintf(UART0, name);
+ while (1);
+}
+
+
+
+/***************************************************************************** */
+int main(void)
+{
+ system_init();
+ uart_on(UART0, 115200, NULL);
+
+
+ i2c_on(I2C0, I2C_CLK_100KHz, I2C_MASTER);
+
+ /* Configure uv sensor */
+ sensor_config(UART0);
+
+ while (1) {
+ /* BME280 uv sensor */
+ msleep(200);
+ sensor_display(UART0);
+ }
+ return 0;
+}
+
