powermgmt: Add battery current measurement

This allows targets to report the actual discharging or
charging current if they are able to.

Change-Id: I0b538e6ac94346f1434e45f83c8da8c1260a53a3

2 files changed, 9 insertions, 0 deletions

diff --git a/firmware/export/config.h b/firmware/export/config.h
index 17bc626a80..2ae7ef2c53 100644
--- a/firmware/export/config.h
+++ b/firmware/export/config.h
@@ -208,6 +208,8 @@
                                  Usually application ports, and only
                                  if the estimation is better that ours
                                  (which it probably is) */
+#define CURRENT_MEASURE     8 /* Target can report battery charge and/or
+                               * discharge current */
 /* CONFIG_LCD */
 #define LCD_SSD1815   1 /* as used by Sansa M200 and others */
 #define LCD_S1D15E06  3 /* as used by iRiver H100 series */
diff --git a/firmware/export/powermgmt.h b/firmware/export/powermgmt.h
index c6fc3d5bdf..9d4d4e06aa 100644
--- a/firmware/export/powermgmt.h
+++ b/firmware/export/powermgmt.h
@@ -94,6 +94,11 @@ void powermgmt_init(void) INIT_ATTR;
 #define BATT_AVE_SAMPLES 128
 #endif
 
+#ifndef BATT_CURRENT_AVE_SAMPLES
+/* TODO may need tweaking */
+#define BATT_CURRENT_AVE_SAMPLES 16
+#endif
+
 #ifndef POWER_THREAD_STEP_TICKS
 /* 2HZ sample rate unless otherwise specified */
 #define POWER_THREAD_STEP_TICKS (HZ/2)
@@ -118,6 +123,8 @@ int battery_current(void); /* battery current in milliamps
 int _battery_level(void); /* percent */
 int _battery_time(void); /* minutes */
 int _battery_voltage(void); /* voltage in millivolts */
+int _battery_current(void); /* (dis)charge current in milliamps */
+
 #if CONFIG_CHARGING >= CHARGING_TARGET
 void powermgmt_init_target(void);
 void charging_algorithm_close(void);