ppr1: add crude version of charge controller driver

docs/software/nrf52-TODO.md

@@ -7,9 +7,12 @@
 
 ### PPR1 TODO
 
-* fix usb
+* fix usb - check latest tinyusb
+* Test GPS - try pulsing reset
+* properly test charge controller config and read battery/charge status
 * fix bluetooth
-* Test GPS
+* fix LCD max contrast (currently too high, needs to be about 40?)
+* save brightness settings in flash
 * make ST7567Wire driver less ugly, move OLED stuff into a common class treee
 * add LCD power save mode for lcd per page 31 of datasheet
 * add LCD power off sequence per datasheet to lcd driver

src/gps/GPS.cpp

@@ -33,6 +33,13 @@ bool GPS::setup()
     pinMode(PIN_GPS_EN, OUTPUT);
 #endif
 
+#ifdef PIN_GPS_RESET
+    digitalWrite(PIN_GPS_RESET, 1); // assert for 10ms
+    pinMode(PIN_GPS_RESET, OUTPUT);
+    delay(10);
+    digitalWrite(PIN_GPS_RESET, 0);
+#endif
+
     setAwake(true); // Wake GPS power before doing any init
     bool ok = setupGPS();
 
@@ -53,12 +60,6 @@ void GPS::wake()
     digitalWrite(PIN_GPS_WAKE, GPS_WAKE_ACTIVE);
     pinMode(PIN_GPS_WAKE, OUTPUT);
 #endif
-
-#ifdef PIN_GPS_RESET
-    digitalWrite(PIN_GPS_RESET, 0);
-    pinMode(PIN_GPS_RESET, OUTPUT);
-#endif
-
 }
 
 

src/nrf52/BQ25713.cpp

@@ -0,0 +1,100 @@
+#include "BQ25713.h"
+#include "configuration.h"
+
+#include <Wire.h>
+
+#ifdef BQ25703A_ADDR
+
+const uint8_t BQ25713::devAddr = BQ25703A_ADDR;
+
+bool BQ25713::setup()
+{
+    DEBUG_MSG("Init BQ25713\n");
+
+    //	if(!writeReg(0x34,0x9034)) return false;
+    //
+    //	if(!writeReg(0x34,0x8034)) return false;
+
+    if (!writeReg(0x00, 0x0F0A))
+        return false; // Config Charge Option 0
+
+    if (!writeReg(0x02, 0x0224))
+        return false; // Config Charge Current
+
+    if (!writeReg(0x04, 0x1070))
+        return false; // Config Charge Voltage
+
+    if (!writeReg(0x06, 0x099C))
+        return false; // Config OTG Voltage
+
+    if (!writeReg(0x08, 0x5000))
+        return false; // Config OTG Current
+
+    //	if(!writeReg(0x0A,0x0100)) return false;//Config Input Voltage
+
+    if (!writeReg(0x0C, 0x1800))
+        return false; // Config Minimum System Voltage
+
+    if (!writeReg(0x0E, 0x4900))
+        return false; // Config Input Current
+
+    if (!writeReg(0x30, 0xE210))
+        return false; // Config Charge Option 1
+
+    if (!writeReg(0x32, 0x32BF))
+        return false; // Config Charge Option 2
+
+    if (!writeReg(0x34, 0x0834))
+        return false; // Config Charge Option 3
+
+    if (!writeReg(0x36, 0x4A65))
+        return false; // Config Prochot Option 0
+
+    if (!writeReg(0x38, 0x81FF))
+        return false; // Config Prochot Option 1
+
+    if (!writeReg(0x3A, 0xA0FF))
+        return false; // Config ADC Option
+
+    return true;
+}
+
+uint16_t BQ25713::readReg(uint8_t reg)
+{
+    Wire.beginTransmission(devAddr);
+    Wire.write(reg);
+    byte err = Wire.endTransmission();
+    if (!err) {
+        int readLen = 2;
+        Wire.requestFrom(devAddr, (int)(readLen + 1));
+        if (Wire.available() >= readLen) {
+            uint8_t lsb = Wire.read(), msb = Wire.read();
+
+            return (((uint16_t)msb) << 8) + lsb;
+        } else
+            return 0;
+    } else {
+        return 0;
+    }
+}
+
+bool BQ25713::writeReg(uint8_t reg, uint16_t v)
+{
+    Wire.beginTransmission(devAddr);
+    Wire.write(reg);
+    Wire.write(v & 0xff);
+    Wire.write((v >> 8) & 0xff);
+    byte err = Wire.endTransmission(); // 0 for success
+
+    if (!err) {
+        // Do a test readback for early debugging
+        uint16_t found = readReg(reg);
+        if (found != v) {
+            DEBUG_MSG("Readback reg=0x%0x test failed, expected 0x%0x, found 0x%0x!\n", reg, v, found);
+            return true; // claim success - FIXME
+        }
+    }
+    return !err;
+}
+
+#endif

src/nrf52/BQ25713.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <Arduino.h>
+
+/**
+ * Driver class to control/monitor BQ25713 charge controller
+ */
+class BQ25713 {
+    static const uint8_t devAddr;
+
+public:
+
+    /// Return true for success
+    bool setup();
+
+private:
+    uint16_t readReg(uint8_t reg);
+
+    /// Return true for success
+    bool writeReg(uint8_t reg, uint16_t v);
+};
+

src/nrf52/main-nrf52.cpp

@@ -82,6 +82,8 @@ int printf(const char *fmt, ...)
     return res;
 }
 
+#include "BQ25713.h"
+
 void nrf52Setup()
 {
 
@@ -93,8 +95,11 @@ void nrf52Setup()
     // This is the recommended setting for Monitor Mode Debugging
     NVIC_SetPriority(DebugMonitor_IRQn, 6UL);
 
-    // Not yet on board
-    // pmu.init();
+#ifdef BQ25703A_ADDR
+    auto *bq = new BQ25713();
+    if(!bq->setup())
+        DEBUG_MSG("ERROR! Charge controller init failed\n");
+#endif
 
     // Init random seed
     // FIXME - use this to get random numbers

variants/ppr1/variant.h

@@ -107,10 +107,10 @@ static const uint8_t AREF = PIN_AREF;
 // #define GPS_TX_PIN PIN_SERIAL1_TX
 // #define GPS_RX_PIN PIN_SERIAL1_RX
 
-#define PIN_GPS_RESET 29 // active high?
+#define PIN_GPS_RESET 29 // active high
 #define PIN_GPS_PPS 28
 // #define PIN_GPS_WAKE 20 // CELL_CTRL in schematic? based on their example code
-#define PIN_GPS_EN 7 // GPS_EN active high?
+#define PIN_GPS_EN 7 // GPS_EN active high
 
 #define PIN_VUSB_EN 21
 
@@ -119,6 +119,9 @@ static const uint8_t AREF = PIN_AREF;
 #define PIN_LCD_RESET 23 // active low, pulse low for 20ms at boot
 #define USE_ST7567
 
+/// Charge controller I2C address
+#define BQ25703A_ADDR 0x6b
+
 // Define if screen should be mirrored left to right
 #define SCREEN_MIRROR