Tyler Chen Onboarding

lm75bd/lm75bd.c

@@ -10,6 +10,7 @@
 /* LM75BD Registers (p.8) */
 #define LM75BD_REG_CONF 0x01U  /* Configuration Register (R/W) */
 
+
 error_code_t lm75bdInit(lm75bd_config_t *config) {
   error_code_t errCode;
 
@@ -25,9 +26,22 @@ error_code_t lm75bdInit(lm75bd_config_t *config) {
   return ERR_CODE_SUCCESS;
 }
 
+#define CONF_WRITE_POINTER_BUFF_SIZE 1U
 error_code_t readTempLM75BD(uint8_t devAddr, float *temp) {
   /* Implement this driver function */
-
+  error_code_t errCode;
+  uint8_t buff[CONF_WRITE_POINTER_BUFF_SIZE] = {0};
+  errCode = i2cSendTo(devAddr, buff, CONF_WRITE_POINTER_BUFF_SIZE);
+  if (errCode != ERR_CODE_SUCCESS) return errCode;
+
+  uint8_t temp_bytes[2U] = {0}; // first interpret data as unsigned
+  errCode = i2cReceiveFrom(devAddr, temp_bytes, 2);
+  if (errCode != ERR_CODE_SUCCESS) return errCode;
+
+  int data = temp_bytes[0];
+  data -= 2 * ((1 << 7) & data); // handle signed bit
+  data = (data << 3) | (temp_bytes[1] >> 5); // get LSbyte
+  *temp = (float) data * 0.125;
   return ERR_CODE_SUCCESS;
 }
 

lm75bd/lm75bd.h

@@ -5,7 +5,7 @@
 #include <stdint.h>
 
 /* LM75BD I2C Device Address */
-#define LM75BD_OBC_I2C_ADDR /* Define the address here */
+#define LM75BD_OBC_I2C_ADDR 0x4FU
 
 /* LM75BD Configuration Values */
 #define LM75BD_DEV_OP_MODE_NORMAL 0x00U

services/thermal_mgr/thermal_mgr.c

@@ -17,6 +17,8 @@ static StackType_t thermalMgrTaskStack[THERMAL_MGR_STACK_SIZE];
 
 #define THERMAL_MGR_QUEUE_LENGTH 10U
 #define THERMAL_MGR_QUEUE_ITEM_SIZE sizeof(thermal_mgr_event_t)
+#define THERMAL_OVERTEMPERATURE_THRESHOLD 80.0
+#define THERMAL_HYSTERESIS_THRESHOLD 75.0
 
 static QueueHandle_t thermalMgrQueueHandle;
 static StaticQueue_t thermalMgrQueueBuffer;
@@ -38,23 +40,43 @@ void initThermalSystemManager(lm75bd_config_t *config) {
   thermalMgrQueueHandle = xQueueCreateStatic(
     THERMAL_MGR_QUEUE_LENGTH, THERMAL_MGR_QUEUE_ITEM_SIZE,
     thermalMgrQueueStorageArea, &thermalMgrQueueBuffer);
-
 }
 
 error_code_t thermalMgrSendEvent(thermal_mgr_event_t *event) {
   /* Send an event to the thermal manager queue */
-
+  xQueueSend(thermalMgrQueueHandle, event, portMAX_DELAY);
   return ERR_CODE_SUCCESS;
 }
 
 void osHandlerLM75BD(void) {
   /* Implement this function */
+  thermal_mgr_event_t event;
+  event.type = THERMAL_MGR_EVENT_OS_INTERRUPT;
+  thermalMgrSendEvent(&event);
 }
 
 static void thermalMgr(void *pvParameters) {
   /* Implement this task */
   while (1) {
-
+    thermal_mgr_event_t event;
+    if (xQueueReceive(thermalMgrQueueHandle, &event, portMAX_DELAY)) {
+      const lm75bd_config_t data = *(lm75bd_config_t *) pvParameters;
+      float temperature;
+      readTempLM75BD(data.devAddr, &temperature);
+      switch (event.type) {
+        case THERMAL_MGR_EVENT_MEASURE_TEMP_CMD:
+          addTemperatureTelemetry(temperature);
+          break;
+        case THERMAL_MGR_EVENT_OS_INTERRUPT:
+          if (temperature > THERMAL_OVERTEMPERATURE_THRESHOLD) {
+            overTemperatureDetected();
+          }
+          if (temperature < THERMAL_HYSTERESIS_THRESHOLD) {
+            safeOperatingConditions();
+          }
+          break;
+      }
+    }
   }
 }
 

services/thermal_mgr/thermal_mgr.h

@@ -5,9 +5,10 @@
 
 typedef enum {
   THERMAL_MGR_EVENT_MEASURE_TEMP_CMD,
-
+  THERMAL_MGR_EVENT_OS_INTERRUPT,
 } thermal_mgr_event_type_t;
 
+
 typedef struct {
   thermal_mgr_event_type_t type;
 } thermal_mgr_event_t;