Add initial voltage log.

Log in V vs mV.
Add link to help.

lib/BlueSCSI_platform_RP2040/BlueSCSI_platform.cpp

@@ -356,6 +356,7 @@ static void usb_log_poll()
 // Use ADC to implement supply voltage monitoring for the +3.0V rail.
 // This works by sampling the temperature sensor channel, which has
 // a voltage of 0.7 V, allowing to calculate the VDD voltage.
+static bool adc_initial_log = true;
 static void adc_poll()
 {
 #if PLATFORM_VDD_WARNING_LIMIT_mV > 0
@@ -391,10 +392,16 @@ static void adc_poll()
         int vdd_mV = (700 * 4096) / adc_value_max;
         if (vdd_mV < lowest_vdd_seen)
         {
-            log("WARNING: Detected supply voltage drop to ", vdd_mV, "mV. Verify power supply is adequate.");
+            log("WARNING: Detected voltage drop to ", (vdd_mV / 1000.0), "V - See: https://www.github.com/BlueSCSI/BlueSCSI-v2/wiki/Low-Voltage");
             lowest_vdd_seen = vdd_mV - 50; // Small hysteresis to avoid excessive warnings
         }
     }
+    else if (adc_initial_log && adc_value_max != 0)
+    {
+        adc_initial_log = false;
+        int vdd_mV = (700 * 4096) / adc_value_max;
+        log("INFO: Pico Voltage: ", (vdd_mV / 1000.0), "V.");
+    }
 #endif
 }
 

src/BlueSCSI_log.cpp

@@ -116,6 +116,13 @@ void log_raw(bytearray array)
     }
 }
 
+void log_raw(double value)
+{
+    char buffer[6];
+    snprintf(buffer, sizeof buffer, "%0.3f", value);
+    log_raw(buffer);
+}
+
 uint32_t log_get_buffer_len()
 {
     return g_logpos;

src/BlueSCSI_log.h

@@ -34,6 +34,9 @@ void log_raw(uint64_t value);
 // Log integer as decimal
 void log_raw(int value);
 
+// Log double
+void log_raw(double value);
+
 // Log array of bytes
 struct bytearray {
     bytearray(const uint8_t *data, size_t len): data(data), len(len) {}