Diff: main.cpp

Revision:

0:84c0a170d0c0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun May 17 00:58:51 2020 +0000
@@ -0,0 +1,62 @@
+#include "mbed.h"
+
+Serial pc (USBTX, USBRX);
+I2C i2c(p9, p10);
+
+//BME680 Slave address
+#define ADDR_BME 0xED
+
+//LPS331AP registers
+#define BME_WHO   0xD0
+#define BME_SET1  0x74
+#define BME_SET2  0x72
+#define BME_P_LL  0x21
+#define BME_P_L   0x20
+#define BME_P_H   0x1F
+
+char cmd[2];
+
+void i2c_write(char addr, char regist, char data)
+{
+    cmd[0] = regist;
+    cmd[0] = data;
+    i2c.write(addr, cmd, 2);
+}
+
+char i2c_read(char addr, char regist)
+{
+    cmd[0] = regist;
+    i2c.write(addr, cmd, 1);
+    i2c.read(addr, cmd, 1);
+    return cmd[0];
+}
+
+int main()
+{
+    unsigned long ID, H, L, XL;
+    char id[2], data[3];
+    double P;
+    
+    ID = i2c_read(ADDR_BME, BME_WHO);
+    pc.printf("ID = 0x%x\n", ID);
+
+    while(1)
+    {
+        i2c_write(ADDR_BME, BME_SET1, 0x07);
+        wait(0.5);
+        i2c_write(ADDR_BME, BME_SET2, 0x00);
+        
+        H = i2c_read(ADDR_BME, BME_P_H);
+        
+        L = i2c_read(ADDR_BME, BME_P_L);
+        
+        XL = i2c_read(ADDR_BME, BME_P_LL);
+        
+        P = (H << 8) | (L << 8) | XL;
+        pc.printf("P = %lf\n", P);
+        
+        wait(1.0);
+        
+    }
+    
+}