From 22c62ff3fe0c373bf2c3ef94b1fc30dbecb086c1 Mon Sep 17 00:00:00 2001
From: Jason Reiss <jreiss@multitech.com>
Date: Thu, 1 Apr 2021 16:34:19 -0500
Subject: Check if temp is below lowest table.

---
 lora_pkt_fwd/src/lora_pkt_fwd.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/lora_pkt_fwd/src/lora_pkt_fwd.c b/lora_pkt_fwd/src/lora_pkt_fwd.c
index a181ea7..87eaaa0 100644
--- a/lora_pkt_fwd/src/lora_pkt_fwd.c
+++ b/lora_pkt_fwd/src/lora_pkt_fwd.c
@@ -336,7 +336,6 @@ void thread_spectralscan(void);
 
 #define TEMP_LUT_SIZE_MAX 13
 
-
 /**
 @struct lgw_tx_alt_gain_s
 @brief Structure containing all gains of Tx chain
@@ -374,7 +373,9 @@ void lookup_power_settings(float tx_pwr, int8_t* rf_power, int8_t* dig_gain) {
     float min_diff = 99;
 
     for (int i = 0; i < TEMP_LUT_SIZE_MAX; i++) {
-        if (i == TEMP_LUT_SIZE_MAX-1 || (tx_temp_lut.lut[i].temp <= temp_comp_value && tx_temp_lut.lut[i+1].temp > temp_comp_value)) {
+        // If the current temp is lower than the first temp or we reach the end of the table
+        if ((tx_temp_lut->dig[0].temp > tx_temp_lut->temp_comp_value || i == TEMP_LUT_SIZE_MAX-1) ||
+             (tx_temp_lut.lut[i].temp <= temp_comp_value && tx_temp_lut.lut[i+1].temp > temp_comp_value)) {
             for (int j = 0; j < TX_GAIN_LUT_SIZE_MAX; j++) {
                 for (int h = 0; h < 4; h++) {
                     if (tx_pwr >= tx_temp_lut.lut[i].dig_gain[j*4+h] && (tx_pwr - tx_temp_lut.lut[i].dig_gain[j*4+h]) < min_diff) {
@@ -399,8 +400,6 @@ void load_temp_lookup() {
 
     int i;
     char param_name[32]; /* used to generate variable parameter names */
-    const char *str; /* used to store string value from JSON object */
-    const char conf_obj_name[] = "SX1301_conf";
     JSON_Value *root_val = NULL;
     JSON_Object *conf_obj = NULL;
     JSON_Object *conf_lut_obj = NULL;
@@ -477,11 +476,10 @@ void load_temp_lookup() {
         snprintf(param_name, sizeof param_name, "LUT%i", temp); /* compose parameter path inside JSON structure */
         conf_array = json_object_get_array(json_value_get_object(root_val), param_name);
         if (conf_array != NULL) {
-	    tx_temp_lut.lut[index].temp = temp; 
+            tx_temp_lut.lut[index].temp = temp;
             for (int j = 0; j < 64; j++) {
                 /* Get lut channel configuration object from array */
-                float val = (float)json_array_get_number(conf_array, j);
-                tx_temp_lut.lut[index].dig_gain[j] = val;
+                tx_temp_lut.lut[index].dig_gain[j] = (float)json_array_get_number(conf_array, j);
             }
             index++;
         }
@@ -496,7 +494,7 @@ static void update_temp_comp_value() {
     /* try to open file to read */
     FILE *filePointer;
 
-    if (filePointer = fopen(temp_comp_file, "r")) {
+    if ((filePointer = fopen(temp_comp_file, "r"))) {
         int bufferLength = 10;
         char buffer[bufferLength];
 
-- 
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