Diff: main.cpp

Revision:

2:aa39032bf778

Parent:

1:72ad3ee71812

Child:

3:d1beaf95d945

--- a/main.cpp	Sun Apr 07 07:43:15 2019 +0000
+++ b/main.cpp	Sun Apr 07 08:59:53 2019 +0000
@@ -64,7 +64,7 @@
 {
     uint32_t i;
     float temperature;
-    uint16_t cfg;
+    uint8_t cfg;
     DigitalOut rLED(LED1, LED_OFF);
     DigitalOut gLED(LED2, LED_OFF);
     DigitalOut bLED(LED3, LED_OFF);
@@ -75,15 +75,12 @@
     DS1775 temp_sensor(i2cBus, DS1775_I2C_SLAVE_ADR_R0);
     i2cBus.frequency(400000);
    
-    /* Configure for fault filter 1, comparator, continuous,
-     * normal format, 8 sps, 12 bit resolution
+    /* Configure for 9 bit resolution, fault filter 1, 
+       active low, comparator, continuous,
      */
-#if 0
-    temp_sensor.write_cfg(uint16_t(DS1775_CFG_FAULT_FILTER_1 | 
-        DS1775_CFG_COMPARATOR_MODE | DS1775_CFG_CONTINUOUS | 
-        DS1775_CFG_NORMAL_FORMAT | DS1775_CFG_CONV_RATE_8 | 
-        DS1775_CFG_RESOLUTION_12BIT));
-#endif
+    temp_sensor.write_cfg(uint16_t(DS1775_CFG_RESOLUTION_9BIT |
+        DS1775_CFG_FAULT_FILTER_6 | DS1775_CFG_OS_POLARITY_ACT_LOW |
+        DS1775_CFG_COMPARATOR_MODE | DS1775_CFG_CONTINUOUS));
     for (i = 0; i < 10; i++) {
         wait(DS1775_WAIT_CONV_TIME_9BIT);
         temperature = temp_sensor.read_reg_as_temperature(DS1775_REG_TEMPERATURE);
@@ -93,10 +90,10 @@
     temperature = temp_sensor.read_reg_as_temperature(DS1775_REG_TOS_HIGH_TRIP);
         printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", 
             temperature, temp_sensor.celsius_to_fahrenheit(temperature));
+    temp_sensor.read_cfg_reg(&cfg);
+    printf("Configuration Register = 0x%02Xh \r\n", cfg);
+    
 #if 0
-    temp_sensor.read_reg(&cfg, DS1775_REG_CONFIGURATION);
-    printf("Configuration Register = 0x%04Xh \r\n", cfg);
-  #if 0
     temp_sensor.write_trip_low(-63.9375);
     wait(0.03);
     temperature = temp_sensor.read_reg_as_temperature(DS1775_REG_THYST_LOW_TRIP);
@@ -113,25 +110,33 @@
 
     printf("\r\n");
 
-    /* Configure for fault filter 4, interrupt, shutdown,
-     * extended format, 0.25 sps, 10 bit resolution, start one-shot
-     */
-    for (i = 0; i < 2; i++) {
-        temp_sensor.write_cfg(uint16_t(DS1775_CFG_FAULT_FILTER_4 | 
-            DS1775_CFG_INTERRUPT_MODE | DS1775_CFG_SHUTDOWN |
-            DS1775_CFG_EXTENDED_FORMAT| DS1775_CFG_CONV_RATE_0_25 | 
-            DS1775_CFG_RESOLUTION_10BIT | DS1775_CFG_ONE_SHOT_START));
-        wait(DS1775_WAIT_CONV_RATE_0_25);
+
+    temp_sensor.read_cfg_reg(&cfg);
+    printf("Configuration Register = 0x%02Xh \r\n", cfg);
+    for (i = 0; i < 8; i++) {
+        /* Configure for 12 bit resolution, fault filter 2, 
+           active low, interrupt, continous,
+        */
+        temp_sensor.write_cfg(uint16_t(DS1775_CFG_RESOLUTION_12BIT |
+            DS1775_CFG_FAULT_FILTER_6 | DS1775_CFG_OS_POLARITY_ACT_LOW |
+            DS1775_CFG_INTERRUPT_MODE | DS1775_CFG_CONTINUOUS));
+        wait(DS1775_WAIT_CONV_TIME_9BIT);
         temperature = temp_sensor.read_reg_as_temperature(DS1775_REG_TEMPERATURE);
         printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", 
             temperature, temp_sensor.celsius_to_fahrenheit(temperature));
+        temp_sensor.write_cfg(uint16_t(DS1775_CFG_RESOLUTION_12BIT |
+            DS1775_CFG_FAULT_FILTER_6 | DS1775_CFG_OS_POLARITY_ACT_LOW |
+            DS1775_CFG_INTERRUPT_MODE | DS1775_CFG_SHUTDOWN));
+        wait(2); /*  leave it in shutdown mode for a while */
     }
-    temp_sensor.read_reg(&cfg, DS1775_REG_CONFIGURATION);
-    printf("Configuration Register = 0x%04Xh \r\n", cfg);
+    temp_sensor.read_cfg_reg(&cfg);
+    printf("Configuration Register = 0x%02Xh \r\n", cfg);
 
     printf("\r\n\r\n");
 
 #if 0
+
+#if 0
     temp_sensor.write_trip_low(-127.9375);
     wait(0.03);
     temp_sensor.read_reg(&cfg, DS1775_REG_CONFIGURATION);