From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 1 Apr 2014 10:54:17 +0000 (+0300)
Subject: Provide peak current since last read
X-Git-Url: http://git.tdb.fi/?p=model-railway-devices.git;a=commitdiff_plain

Provide peak current since last read
---

diff --git a/arducontrol/monitor.c b/arducontrol/monitor.c
index c3804fc..99f0d45 100644
--- a/arducontrol/monitor.c
+++ b/arducontrol/monitor.c
@@ -7,6 +7,7 @@
 static uint16_t track_current_samples[16] = { 0 };
 static uint8_t track_current_head = 0;
 static uint16_t track_current_sum = 0;
+static uint16_t track_current_peak = 0;
 static uint16_t overcurrent_limit = 9707;
 static uint8_t overcurrent_sent = 0;
 
@@ -17,6 +18,8 @@ static uint16_t input_voltage_sum = 0;
 static volatile uint8_t adc_state = 0;
 static volatile uint16_t adc_value = 0;
 
+static uint16_t current_milliamps(uint16_t);
+
 void monitor_init(void)
 {
 	DDRB |= 0x02;
@@ -37,6 +40,9 @@ void monitor_check(void)
 			track_current_sum += value;
 			track_current_head = (i+1)&15;
 
+			if(track_current_sum>track_current_peak)
+				track_current_peak = track_current_sum;
+
 			if(track_current_sum>overcurrent_limit)
 			{
 				output_set_power(0);
@@ -75,10 +81,15 @@ uint8_t monitor_command(const uint8_t *cmd_buf, uint8_t cmd_length)
 			return LENGTH_ERROR;
 
 		uint16_t value = monitor_track_current();
-		uint8_t reply[3];
+		uint16_t peak = current_milliamps(track_current_peak);
+		track_current_peak = 0;
+
+		uint8_t reply[5];
 		reply[0] = TRACK_CURRENT;
 		reply[1] = value>>8;
 		reply[2] = value;
+		reply[3] = peak>>8;
+		reply[4] = peak;
 		interface_send(reply, sizeof(reply));
 	}
 	else if(cmd_buf[0]==SET_OVERCURRENT_LIMIT)
@@ -113,10 +124,8 @@ uint8_t monitor_command(const uint8_t *cmd_buf, uint8_t cmd_length)
 	return COMMAND_OK;
 }
 
-uint16_t monitor_track_current(void)
+static uint16_t current_milliamps(uint16_t value)
 {
-	uint16_t value = track_current_sum;
-
 	// Convert to milliamps: (v/16*5/1024-2.5)*1000/0.185
 	if(value<8192)  // Ignore negative current readings
 		return 0;
@@ -130,6 +139,11 @@ uint16_t monitor_track_current(void)
 	}
 }
 
+uint16_t monitor_track_current(void)
+{
+	return current_milliamps(track_current_sum);
+}
+
 uint16_t monitor_input_voltage(void)
 {
 	uint16_t value = input_voltage_sum;