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The Bosch BME280 pressure-temperature-humidity sensor is very popular for projects because there are breakout boards available from Adafruit and Sparkfun as well as a large library of code to interface it to Arduino MCUs. Not so much for the MSP430, especially transparent code to understand what is happening at the register level. I have written and tested some demo C-code that hopefully fills that gap. It sacrifices generality and efficiency for compactness and transparency. I use the F5529 Launchpad and communication with the sensor is via SPI using the UCB0 module. I2C is also available for the BME280 but not implemented here. Temperature and relative humidity (no pressure) data is obtained using the forced mode with periodic polling by the MSP430. Sensor and MCU are in low-power sleep modes when not active. Data is streamed to a terminal program that is interfaced to the Launchpad via serial UART. Each BME280 has unique trimming parameters that must be retrieved and properly parsed to convert the raw data. This process is quite complicated, so separate functions were developed to handle them and placed in an include library. My IDE is CCS 6.1.3 with nofloat printf support. This code should work directly in the MSP430x5xx and MSP430x6xx families. Other MSP430 series such as FR and value-line will need to make appropriate module/register modifications. Link to github is here: https://github.com/microphonon/BME280
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Hello, I'm using energia 1.6.10E18 with the launchpad MSP430G2 and the MSPG2553 installed. So I saw that in another forum the library from cactus.io was used for the BME280. That library was for the I2C. Now I want to use the SPI library and they had one.(http://cactus.io/hookups/sensors/barometric/bme280/hookup-arduino-to-bme280-barometric-pressure-sensor-spi). So I installed the library changed it to hardware SPI with the cs pin on P2_1. And it compiled, but i'm only getting these results: 813.81 mb 100.00 % 0.00 *C 32.00 *F 813.81 mb 100.00 % 0.00 *C 32.00 *F 813.81 mb 100.00 % 0.00 *C 32.00 *F 813.81 mb 100.00 % 0.00 *C 32.00 *F It looks like the msp430 is not getting any data in/out. I probed the SPI connections with my oscilloscope en there is literally nothing happening. While with the basic example sketch I can clearly see what code is sending. Can anyone help me understand this problem and hopefully fix this. I want the SPI connection to work because I want the nrf24l01 and BME280 working side by side. The msp430 can't do SPI and I2C together like an arduino so you need to chose between them. This is the code I'm using and the library on the website. #include <SPI.h> #include "cactus_io_BME280_SPI.h" #define BME_CS P2_1 BME280_SPI bme(P2_1); void setup() { Serial.begin(9600); Serial.println("Bosch BME280 Pressure - Humidity - Temp Sensor | cactus.io"); if (!bme.begin()) { Serial.println("Could not find a valid BME280 sensor, check wiring!"); while (1); } Serial.println("Pressure\tHumdity\t\tTemp\ttTemp"); } void loop() { bme.readSensor(); Serial.print(bme.getPressure_MB()); Serial.print(" mb\t"); // Pressure in millibars Serial.print(bme.getHumidity()); Serial.print(" %\t\t"); Serial.print(bme.getTemperature_C()); Serial.print(" *C\t"); Serial.print(bme.getTemperature_F()); Serial.println(" *F"); // Add a 2 second delay. delay(1000); //just here to slow down the output. }
