I2C Analog ADS1219 Addon Support

configs/Pico/BoardConfig.h

@@ -36,7 +36,7 @@
 #define PIN_BUTTON_A1   20          // A1 / Guide / Home / ~ / 13 / ~
 #define PIN_BUTTON_A2   21          // A2 / ~ / Capture / ~ / 14 / ~
 #define PIN_BUTTON_TURBO 14         // Turbo
-#define PIN_BUTTON_REVERSE 22       // UDLR Reverse
+#define PIN_BUTTON_REVERSE -1       // UDLR Reverse
 #define PIN_SLIDER_LS    -1         // Left Stick Slider
 #define PIN_SLIDER_RS    -1         // Right Stick Slider
 
@@ -122,10 +122,6 @@
 #define ANALOG_ADC_VRY -1
 
 
-// Reverse Button section
-#define REVERSE_LED_PIN 12
-
-
 // This is the I2C Display section (commonly known as the OLED display section).
 // In this section you can specify if a display as been enabled, which pins are assined to it, the block address and speed.
 // The default for `HAS_I2C_DISPLAY` is `1` which enables it.
@@ -179,6 +175,15 @@
 #define DISPLAY_FLIP 0
 #define DISPLAY_INVERT 0
 
+// I2C Analog ADS1219 Add-on Options
+#define I2C_ANALOG1219_SDA_PIN -1
+#define I2C_ANALOG1219_SCL_PIN -1
+#define I2C_ANALOG1219_BLOCK i2c0
+#define I2C_ANALOG1219_SPEED 400000
+#define I2C_ANALOG1219_ADDRESS 0x40
+
+// Reverse Button section
+#define REVERSE_LED_PIN -1
 #define REVERSE_UP_DEFAULT 1
 #define REVERSE_DOWN_DEFAULT 1
 #define REVERSE_LEFT_DEFAULT 1

include/inputs/i2canalog1219.h

@@ -0,0 +1,51 @@
+#ifndef _I2CAnalog_H
+#define _I2CAnalog_H
+
+#include <ADS1219.h>
+
+#include "gpaddon.h"
+
+#include "GamepadEnums.h"
+
+#ifndef I2C_ANALOG1219_SDA_PIN
+#define I2C_ANALOG1219_SDA_PIN    -1
+#endif
+
+#ifndef I2C_ANALOG1219_SCL_PIN
+#define I2C_ANALOG1219_SCL_PIN    -1
+#endif
+
+#ifndef I2C_ANALOG1219_BLOCK
+#define I2C_ANALOG1219_BLOCK i2c0
+#endif
+
+#ifndef I2C_ANALOG1219_SPEED
+#define I2C_ANALOG1219_SPEED 400000
+#endif
+
+#ifndef I2C_ANALOG1219_ADDRESS
+#define I2C_ANALOG1219_ADDRESS 0x40
+#endif
+
+// Analog Module Name
+#define I2CAnalog1219Name "I2CAnalog"
+
+typedef struct {
+	float A[4];
+} ADS_PINS;
+
+class I2CAnalog1219Input : public GPAddon {
+public:
+	virtual bool available();   // GPAddon available
+	virtual void setup();       // Analog Setup
+	virtual void process();     // Analog Process
+    virtual std::string name() { return I2CAnalog1219Name; }
+private:
+    ADS1219 * ads;
+	ADS_PINS pins;
+	int channelHop;
+	uint32_t uIntervalMS;       // ADS1219 Interval
+	uint32_t nextTimer;         // Turbo Timer
+};
+
+#endif  // _I2CAnalog_H_

include/storagemanager.h

@@ -64,6 +64,11 @@ struct BoardOptions
 	uint8_t reverseActionDown;
 	uint8_t reverseActionLeft;
 	uint8_t reverseActionRight;
+	int i2cAnalog1219SDAPin;
+	int i2cAnalog1219SCLPin;
+	int i2cAnalog1219Block;
+	uint32_t i2cAnalog1219Speed;
+	uint8_t i2cAnalog1219Address;
 	char boardVersion[32]; // 32-char limit to board name
 	uint32_t checksum;
 };

lib/ADS1219/ADS1219.cpp

@@ -0,0 +1,213 @@
+#include "ADS1219.h"
+
+#include <cstring>
+
+ADS1219::ADS1219(int bWire, int sda, int scl, i2c_inst_t *picoI2C, int32_t speed, uint8_t addr) {
+  bbi2c.iSDA = sda;
+  bbi2c.iSCL = scl;
+  bbi2c.picoI2C = picoI2C;
+  bbi2c.bWire = bWire;
+  iSpeed = speed;
+  address = addr;
+  config = 0x00;
+  singleShot = true;
+}
+
+void ADS1219::begin() {
+  I2CInit(&bbi2c, iSpeed); // on Linux, SDA = bus number, SCL = device address
+  reset();
+}
+
+// 8.5.3.3 START/SYNC (0000 100x)
+//  In single-shot conversion mode, the START/SYNC command is used to start a single conversion, or (when sent
+//  during an ongoing conversion) to reset the digital filter and then restart a single new conversion. When the
+//  device is set to continuous conversion mode, the START/SYNC command must be issued one time to start
+//  converting continuously. Sending the START/SYNC command when converting in continuous conversion mode
+//  resets the digital filter and restarts continuous conversions.
+void ADS1219::start(){
+  uc[0] = 0x08;
+  I2CWrite(&bbi2c, address, uc, 1);
+}
+
+// 8.5.3.4 POWERDOWN (0000 001x)
+//  The POWERDOWN command places the device into power-down mode. This command shuts down all internal
+//  analog components, but holds all register values. In case the POWERDOWN command is issued when a
+//  conversion is ongoing, the conversion completes before the ADS1219 enters power-down mode. As soon as a
+//  START/SYNC command is issued, all analog components return to their previous states.
+void ADS1219::powerDown(){
+  uc[0] = 0x02;
+  I2CWrite(&bbi2c, address, uc, 1);
+}
+
+
+// 8.5.3.6 RREG (0010 0rxx)
+//  The RREG command reads the value of the register at address r. Reading a register must be performed as
+//  shown in Figure 37 by using two I2C communication frames. The first frame is an I2C write operation where the
+//  R/W bit at the end of the address byte is 0 to indicate a write. In this frame, the host sends the RREG command
+//  including the register address to the ADS1219. The second frame is an I2C read operation where the R/W bit at
+//  the end of the address byte is 1 to indicate a read. The ADS1219 reports the contents of the requested register
+//  in this second I2C frame.
+uint8_t ADS1219::readRegister(adsRegister_t reg){ // reg must be 0 or 1
+  uc[0] = 0x20 | (reg<<2); // this is a guess
+  I2CWrite(&bbi2c, address, uc, 1);
+  I2CRead(&bbi2c, address, uc, 1);
+  return uc[0];
+}
+
+// 8.5.3.7 WREG (0100 00xx dddd dddd)
+//  The WREG command writes dddd dddd to the configuration register. Figure 38 shows the sequence for writing
+//  the configuration register. The R/W bit at the end of the address byte is 0 to indicate a write. The WREG
+//  command forces the digital filter to reset and any ongoing ADC conversion to restart.
+void ADS1219::writeRegister(uint8_t data){
+  uc[0] = CONFIG_REGISTER_ADDRESS;
+  uc[1] = data;
+  I2CWrite(&bbi2c, address, uc, 2);
+}
+
+// 8.5.3.5 RDATA (0001 xxxx)
+//  The RDATA command loads the output shift register with the most recent conversion result. Reading conversion
+//  data must be performed as shown in Figure 36 by using two I2C communication frames. The first frame is an I2C
+//  write operation where the R/W bit at the end of the address byte is 0 to indicate a write. In this frame, the host
+//  sends the RDATA command to the ADS1219. The second frame is an I2C read operation where the R/W bit at
+//  the end of the address byte is 1 to indicate a read. The ADS1219 reports the latest ADC conversion data in this
+//  second I2C frame. If a conversion finishes in the middle of the RDATA command byte, the state of the DRDY pin
+//  at the end of the read operation signals whether the old or the new result is loaded. If the old result is loaded,
+//  DRDY stays low, indicating that the new result is not read out. The new conversion result loads when DRDY is
+//  high.
+uint32_t ADS1219::readConversionResult(){
+  uc[0] = 0x10; // Read from 24-bit conversion
+  I2CWrite(&bbi2c, address, uc, 1);
+  I2CRead(&bbi2c, address, uc, 3);
+  uint32_t data32 = (uc[0] << 16) | (uc[1] << 8) | (uc[2]);
+  if (data32 >= 0x800000)
+			data32 = data32-0x1000000;
+  return data32; // 24-bit ADC result signage hack
+}
+
+// 8.5.3.2 RESET (0000 011x)
+//  This command resets the device to the default states. No delay time is required after the RESET command is
+//  latched before starting to communicate with the device as long as the timing requirements (see the I2C Timing
+//  Requirements table) for the (repeated) START and STOP conditions are met.
+void ADS1219::reset(){
+  uc[0] = 0x6;
+  I2CWrite(&bbi2c, address, uc, 1);
+}
+
+void ADS1219::resetConfig(){
+	writeRegister(0x00);
+}
+
+long ADS1219::readSingleEnded(int channel){
+	config &= MUX_MASK;
+	switch (channel){
+    case (0):
+      config |= MUX_SINGLE_0;
+      break;
+    case (1):
+      config |= MUX_SINGLE_1;
+      break;
+    case (2):
+      config |= MUX_SINGLE_2;
+      break;
+    case (3):
+      config |= MUX_SINGLE_3;
+      break;
+	default:
+	  break;
+  }
+  writeRegister(config);
+  return readConversionResult();
+}
+
+long ADS1219::readDifferential_0_1(){
+  config &= MUX_MASK;
+  config |= MUX_DIFF_0_1;
+  writeRegister(config);
+  return readConversionResult();
+}
+
+long ADS1219::readDifferential_2_3(){
+  config &= MUX_MASK;
+  config |= MUX_DIFF_2_3;
+  writeRegister(config);
+  return readConversionResult();
+}
+
+long ADS1219::readDifferential_1_2(){
+  config &= MUX_MASK;
+  config |= MUX_DIFF_1_2;
+  writeRegister(config);
+  return readConversionResult();
+}
+
+long ADS1219::readShorted(){
+  config &= MUX_MASK;
+  config |= MUX_SHORTED;
+  writeRegister(config);
+  return readConversionResult();
+}
+
+void ADS1219::setGain(adsGain_t gain){
+  config &= GAIN_MASK;
+  config |= gain;
+  writeRegister(config);
+}
+
+void ADS1219::setDataRate(int rate){
+	config &= DATA_RATE_MASK;
+	switch (rate){
+    case (20):
+      config |= DATA_RATE_20;
+      break;
+    case (90):
+      config |= DATA_RATE_90;
+      break;
+    case (330):
+      config |= DATA_RATE_330;
+      break;
+    case (1000):
+      config |= DATA_RATE_1000;
+      break;
+	default:
+	  break;
+  }
+  writeRegister(config);
+}
+
+void ADS1219::setConversionMode(adsMode_t mode){
+  config &= MODE_MASK;
+  config |= mode;
+  writeRegister(config);
+  if (mode == CONTINUOUS){
+	  singleShot = false;
+  } else {
+	  singleShot = true;
+  }
+}
+
+void ADS1219::setVoltageReference(adsRef_t vref){
+  config &= VREF_MASK;
+  config |= vref;
+  writeRegister(config);
+}
+
+void ADS1219::setChannel(int channel){
+  config &= MUX_MASK;
+	switch (channel){
+    case (0):
+      config |= MUX_SINGLE_0;
+      break;
+    case (1):
+      config |= MUX_SINGLE_1;
+      break;
+    case (2):
+      config |= MUX_SINGLE_2;
+      break;
+    case (3):
+      config |= MUX_SINGLE_3;
+      break;
+	  default:
+	    break;
+  }
+  writeRegister(config);
+}