Merge pull request #137 from adafruit/genericdevice

add generic device for non-standard transports

Adafruit_BusIO_Register.cpp

@@ -88,6 +88,26 @@ Adafruit_BusIO_Register::Adafruit_BusIO_Register(
   _width = width;
 }
 
+/*!
+ * @brief Create a register we access over a GenericDevice
+ * @param genericdevice Generic device to use
+ * @param reg_addr Register address we will read/write
+ * @param width Width of the register in bytes (1-4)
+ * @param byteorder Byte order of register data (LSBFIRST or MSBFIRST)
+ * @param address_width Width of the register address in bytes (1 or 2)
+ */
+Adafruit_BusIO_Register::Adafruit_BusIO_Register(
+    Adafruit_GenericDevice *genericdevice, uint16_t reg_addr, uint8_t width,
+    uint8_t byteorder, uint8_t address_width) {
+  _i2cdevice = nullptr;
+  _spidevice = nullptr;
+  _genericdevice = genericdevice;
+  _addrwidth = address_width;
+  _address = reg_addr;
+  _byteorder = byteorder;
+  _width = width;
+}
+
 /*!
  *    @brief  Write a buffer of data to the register location
  *    @param  buffer Pointer to data to write
@@ -96,17 +116,14 @@ Adafruit_BusIO_Register::Adafruit_BusIO_Register(
  * uncheckable)
  */
 bool Adafruit_BusIO_Register::write(uint8_t *buffer, uint8_t len) {
-
   uint8_t addrbuffer[2] = {(uint8_t)(_address & 0xFF),
                            (uint8_t)(_address >> 8)};
-
   if (_i2cdevice) {
     return _i2cdevice->write(buffer, len, true, addrbuffer, _addrwidth);
   }
   if (_spidevice) {
     if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
       // very special case!
-
       // pass the special opcode address which we set as the high byte of the
       // regaddr
       addrbuffer[0] =
@@ -116,7 +133,6 @@ bool Adafruit_BusIO_Register::write(uint8_t *buffer, uint8_t len) {
       // the address appears to be a byte longer
       return _spidevice->write(buffer, len, addrbuffer, _addrwidth + 1);
     }
-
     if (_spiregtype == ADDRBIT8_HIGH_TOREAD) {
       addrbuffer[0] &= ~0x80;
     }
@@ -129,6 +145,9 @@ bool Adafruit_BusIO_Register::write(uint8_t *buffer, uint8_t len) {
     }
     return _spidevice->write(buffer, len, addrbuffer, _addrwidth);
   }
+  if (_genericdevice) {
+    return _genericdevice->writeRegister(addrbuffer, _addrwidth, buffer, len);
+  }
   return false;
 }
 
@@ -192,23 +211,20 @@ uint32_t Adafruit_BusIO_Register::read(void) {
 uint32_t Adafruit_BusIO_Register::readCached(void) { return _cached; }
 
 /*!
- *    @brief  Read a buffer of data from the register location
+   @brief Read a number of bytes from a register into a buffer
- *    @param  buffer Pointer to data to read into
+   @param buffer Buffer to read data into
- *    @param  len Number of bytes to read
+   @param len Number of bytes to read into the buffer
- *    @return True on successful write (only really useful for I2C as SPI is
+   @return true on successful read, otherwise false
- * uncheckable)
 */
 bool Adafruit_BusIO_Register::read(uint8_t *buffer, uint8_t len) {
   uint8_t addrbuffer[2] = {(uint8_t)(_address & 0xFF),
                            (uint8_t)(_address >> 8)};
-
   if (_i2cdevice) {
     return _i2cdevice->write_then_read(addrbuffer, _addrwidth, buffer, len);
   }
   if (_spidevice) {
     if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
       // very special case!
-
       // pass the special opcode address which we set as the high byte of the
       // regaddr
       addrbuffer[0] =
@@ -230,6 +246,9 @@ bool Adafruit_BusIO_Register::read(uint8_t *buffer, uint8_t len) {
     }
     return _spidevice->write_then_read(addrbuffer, _addrwidth, buffer, len);
   }
+  if (_genericdevice) {
+    return _genericdevice->readRegister(addrbuffer, _addrwidth, buffer, len);
+  }
   return false;
 }
 

Adafruit_BusIO_Register.h

@@ -6,6 +6,7 @@
 #if !defined(SPI_INTERFACES_COUNT) ||                                          \
     (defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
 
+#include <Adafruit_GenericDevice.h>
 #include <Adafruit_I2CDevice.h>
 #include <Adafruit_SPIDevice.h>
 
@@ -57,6 +58,11 @@ public:
                           uint8_t width = 1, uint8_t byteorder = LSBFIRST,
                           uint8_t address_width = 1);
 
+  Adafruit_BusIO_Register(Adafruit_GenericDevice *genericdevice,
+                          uint16_t reg_addr, uint8_t width = 1,
+                          uint8_t byteorder = LSBFIRST,
+                          uint8_t address_width = 1);
+
   bool read(uint8_t *buffer, uint8_t len);
   bool read(uint8_t *value);
   bool read(uint16_t *value);
@@ -77,6 +83,7 @@ public:
 private:
   Adafruit_I2CDevice *_i2cdevice;
   Adafruit_SPIDevice *_spidevice;
+  Adafruit_GenericDevice *_genericdevice;
   Adafruit_BusIO_SPIRegType _spiregtype;
   uint16_t _address;
   uint8_t _width, _addrwidth, _byteorder;

Adafruit_GenericDevice.cpp

@@ -0,0 +1,78 @@
+/*
+   Written with help by Claude!
+  https://claude.ai/chat/335f50b1-3dd8-435e-9139-57ec7ca26a3c (at this time
+  chats are not shareable :(
+*/
+
+#include "Adafruit_GenericDevice.h"
+
+/*!  @brief Create a Generic device with the provided read/write functions
+     @param read_func Function pointer for reading raw data
+     @param write_func Function pointer for writing raw data
+     @param readreg_func Function pointer for reading registers (optional)
+     @param writereg_func Function pointer for writing registers (optional) */
+Adafruit_GenericDevice::Adafruit_GenericDevice(
+    busio_genericdevice_read_t read_func,
+    busio_genericdevice_write_t write_func,
+    busio_genericdevice_readreg_t readreg_func,
+    busio_genericdevice_writereg_t writereg_func) {
+  _read_func = read_func;
+  _write_func = write_func;
+  _readreg_func = readreg_func;
+  _writereg_func = writereg_func;
+  _begun = false;
+}
+
+/*! @brief Initializes the device
+    @return true if initialization was successful, otherwise false */
+bool Adafruit_GenericDevice::begin(void) {
+  _begun = true;
+  return true;
+}
+
+/*! @brief Write a buffer of data
+    @param buffer Pointer to buffer of data to write
+    @param len Number of bytes to write
+    @return true if write was successful, otherwise false */
+bool Adafruit_GenericDevice::write(const uint8_t *buffer, size_t len) {
+  if (!_begun)
+    return false;
+  return _write_func(buffer, len);
+}
+
+/*! @brief Read data into a buffer
+    @param buffer Pointer to buffer to read data into
+    @param len Number of bytes to read
+    @return true if read was successful, otherwise false */
+bool Adafruit_GenericDevice::read(uint8_t *buffer, size_t len) {
+  if (!_begun)
+    return false;
+  return _read_func(buffer, len);
+}
+
+/*! @brief Read from a register location
+    @param addr_buf Buffer containing register address
+    @param addrsiz Size of register address in bytes
+    @param buf Buffer to store read data
+    @param bufsiz Size of data to read in bytes
+    @return true if read was successful, otherwise false */
+bool Adafruit_GenericDevice::readRegister(uint8_t *addr_buf, uint8_t addrsiz,
+                                          uint8_t *buf, uint16_t bufsiz) {
+  if (!_begun || !_readreg_func)
+    return false;
+  return _readreg_func(addr_buf, addrsiz, buf, bufsiz);
+}
+
+/*! @brief Write to a register location
+    @param addr_buf Buffer containing register address
+    @param addrsiz Size of register address in bytes
+    @param buf Buffer containing data to write
+    @param bufsiz Size of data to write in bytes
+    @return true if write was successful, otherwise false */
+bool Adafruit_GenericDevice::writeRegister(uint8_t *addr_buf, uint8_t addrsiz,
+                                           const uint8_t *buf,
+                                           uint16_t bufsiz) {
+  if (!_begun || !_writereg_func)
+    return false;
+  return _writereg_func(addr_buf, addrsiz, buf, bufsiz);
+}

Adafruit_GenericDevice.h

@@ -0,0 +1,50 @@
+#ifndef ADAFRUIT_GENERICDEVICE_H
+#define ADAFRUIT_GENERICDEVICE_H
+
+#include <Arduino.h>
+
+typedef bool (*busio_genericdevice_read_t)(uint8_t *buffer, size_t len);
+typedef bool (*busio_genericdevice_write_t)(const uint8_t *buffer, size_t len);
+typedef bool (*busio_genericdevice_readreg_t)(uint8_t *addr_buf,
+                                              uint8_t addrsiz, uint8_t *buf,
+                                              uint16_t bufsiz);
+typedef bool (*busio_genericdevice_writereg_t)(uint8_t *addr_buf,
+                                               uint8_t addrsiz,
+                                               const uint8_t *buf,
+                                               uint16_t bufsiz);
+
+/*!
+ * @brief Class for communicating with a device via generic read/write functions
+ */
+class Adafruit_GenericDevice {
+public:
+  Adafruit_GenericDevice(
+      busio_genericdevice_read_t read_func,
+      busio_genericdevice_write_t write_func,
+      busio_genericdevice_readreg_t readreg_func = nullptr,
+      busio_genericdevice_writereg_t writereg_func = nullptr);
+
+  bool begin(void);
+
+  bool read(uint8_t *buffer, size_t len);
+  bool write(const uint8_t *buffer, size_t len);
+  bool readRegister(uint8_t *addr_buf, uint8_t addrsiz, uint8_t *buf,
+                    uint16_t bufsiz);
+  bool writeRegister(uint8_t *addr_buf, uint8_t addrsiz, const uint8_t *buf,
+                     uint16_t bufsiz);
+
+protected:
+  /*! @brief Function pointer for reading raw data from the device */
+  busio_genericdevice_read_t _read_func;
+  /*! @brief Function pointer for writing raw data to the device */
+  busio_genericdevice_write_t _write_func;
+  /*! @brief Function pointer for reading a 'register' from the device */
+  busio_genericdevice_readreg_t _readreg_func;
+  /*! @brief Function pointer for writing a 'register' to the device */
+  busio_genericdevice_writereg_t _writereg_func;
+
+  bool _begun; ///< whether we have initialized yet (in case the function needs
+               ///< to do something)
+};
+
+#endif // ADAFRUIT_GENERICDEVICE_H

README.md

@@ -1,7 +1,7 @@
 # Adafruit Bus IO Library [![Build Status](https://github.com/adafruit/Adafruit_BusIO/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_BusIO/actions)
 
 
-This is a helper library to abstract away I2C & SPI transactions and registers
+This is a helper library to abstract away I2C, SPI, and 'generic transport' (e.g. UART) transactions and registers
 
 Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
 

examples/genericdevice_uartregtest/genericdevice_uartregtest.ino

@@ -0,0 +1,246 @@
+/*
+   Advanced example of using bstracted transport for reading and writing 
+   register data from a UART-based device such as a TMC2209
+
+   Written with help by Claude! https://claude.ai/chat/335f50b1-3dd8-435e-9139-57ec7ca26a3c
+  (at this time chats are not shareable :(
+*/
+
+
+#include "Adafruit_BusIO_Register.h"
+#include "Adafruit_GenericDevice.h"
+
+// Debugging macros
+//#define DEBUG_SERIAL Serial
+
+#ifdef DEBUG_SERIAL
+#define DEBUG_PRINT(x) DEBUG_SERIAL.print(x)
+#define DEBUG_PRINTLN(x) DEBUG_SERIAL.println(x)
+#define DEBUG_PRINT_HEX(x)                                                     \
+  do {                                                                         \
+    if (x < 0x10)                                                              \
+      DEBUG_SERIAL.print('0');                                                 \
+    DEBUG_SERIAL.print(x, HEX);                                                \
+    DEBUG_SERIAL.print(' ');                                                   \
+  } while (0)
+#else
+#define DEBUG_PRINT(x)
+#define DEBUG_PRINTLN(x)
+#define DEBUG_PRINT_HEX(x)
+#endif
+
+// Add IOIN register definition
+#define TMC2209_IOIN 0x06
+
+class TMC2209_UART {
+private:
+  static TMC2209_UART *_instance;
+  Stream *_uart_stream;
+  uint8_t _addr;
+
+  static bool uart_read_impl(uint8_t *buffer, size_t len) {
+    return _instance->uart_read_fn(buffer, len);
+  }
+
+  static bool uart_write_impl(const uint8_t *buffer, size_t len) {
+    return _instance->uart_write_fn(buffer, len);
+  }
+
+  static bool uart_readreg_impl(uint8_t *addr_buf, uint8_t addrsiz,
+                                uint8_t *data, uint16_t datalen) {
+    return _instance->uart_readreg_fn(addr_buf, addrsiz, data, datalen);
+  }
+
+  static bool uart_writereg_impl(uint8_t *addr_buf, uint8_t addrsiz,
+                                 const uint8_t *data, uint16_t datalen) {
+    return _instance->uart_writereg_fn(addr_buf, addrsiz, data, datalen);
+  }
+
+  bool uart_read_fn(uint8_t *buffer, size_t len) {
+    uint16_t timeout = 100;
+    while (_uart_stream->available() < len && timeout--) {
+      delay(1);
+    }
+    if (timeout == 0) {
+      DEBUG_PRINTLN("Read timeout!");
+      return false;
+    }
+
+    DEBUG_PRINT("Reading: ");
+    for (size_t i = 0; i < len; i++) {
+      buffer[i] = _uart_stream->read();
+      DEBUG_PRINT_HEX(buffer[i]);
+    }
+    DEBUG_PRINTLN("");
+
+    return true;
+  }
+
+  bool uart_write_fn(const uint8_t *buffer, size_t len) {
+    DEBUG_PRINT("Writing: ");
+    for (size_t i = 0; i < len; i++) {
+      DEBUG_PRINT_HEX(buffer[i]);
+    }
+    DEBUG_PRINTLN("");
+
+    _uart_stream->write(buffer, len);
+    return true;
+  }
+
+  bool uart_readreg_fn(uint8_t *addr_buf, uint8_t addrsiz, uint8_t *data,
+                       uint16_t datalen) {
+    while (_uart_stream->available())
+      _uart_stream->read();
+
+    uint8_t packet[4] = {0x05, uint8_t(_addr << 1), addr_buf[0], 0x00};
+
+    packet[3] = calcCRC(packet, 3);
+    if (!uart_write_impl(packet, 4))
+      return false;
+
+    // Read back echo
+    uint8_t echo[4];
+    if (!uart_read_impl(echo, 4))
+      return false;
+
+    // Verify echo
+    for (uint8_t i = 0; i < 4; i++) {
+      if (echo[i] != packet[i]) {
+        DEBUG_PRINTLN("Echo mismatch");
+        return false;
+      }
+    }
+
+    uint8_t response[8]; // sync + 0xFF + reg + 4 data bytes + CRC
+    if (!uart_read_impl(response, 8))
+      return false;
+
+    // Verify response
+    if (response[0] != 0x05) {
+      DEBUG_PRINTLN("Invalid sync byte");
+      return false;
+    }
+
+    // Verify 0xFF address byte
+    if (response[1] != 0xFF) {
+      DEBUG_PRINTLN("Invalid reply address");
+      return false;
+    }
+
+    // Verify register address matches our request
+    if (response[2] != addr_buf[0]) {
+      DEBUG_PRINTLN("Register mismatch");
+      return false;
+    }
+
+    // Verify CRC
+    uint8_t crc = calcCRC(response, 7); // Calculate CRC of all but last byte
+    if (crc != response[7]) {
+      DEBUG_PRINTLN("CRC mismatch");
+      return false;
+    }
+
+    // Copy the data bytes
+    memcpy(data, &response[3], 4);
+
+    return true;
+  }
+
+  bool uart_writereg_fn(uint8_t *addr_buf, uint8_t addrsiz, const uint8_t *data,
+                        uint16_t datalen) {
+    while (_uart_stream->available())
+      _uart_stream->read();
+
+    uint8_t packet[8] = {0x05,
+                         uint8_t(_addr << 1),
+                         uint8_t(addr_buf[0] | 0x80),
+                         data[0],
+                         data[1],
+                         data[2],
+                         data[3],
+                         0x00};
+
+    packet[7] = calcCRC(packet, 7);
+    if (!uart_write_impl(packet, 8))
+      return false;
+
+    // Read and verify echo
+    uint8_t echo[8];
+    if (!uart_read_impl(echo, 8))
+      return false;
+
+    // Verify echo matches what we sent
+    for (uint8_t i = 0; i < 8; i++) {
+      if (echo[i] != packet[i]) {
+        DEBUG_PRINTLN("Write echo mismatch");
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  static uint8_t calcCRC(uint8_t *data, uint8_t length) {
+    uint8_t crc = 0;
+    for (uint8_t i = 0; i < length; i++) {
+      uint8_t currentByte = data[i];
+      for (uint8_t j = 0; j < 8; j++) {
+        if ((crc >> 7) ^ (currentByte & 0x01)) {
+          crc = (crc << 1) ^ 0x07;
+        } else {
+          crc = crc << 1;
+        }
+        currentByte = currentByte >> 1;
+      }
+    }
+    return crc;
+  }
+
+public:
+  TMC2209_UART(Stream *serial, uint8_t addr)
+      : _uart_stream(serial), _addr(addr) {
+    _instance = this;
+  }
+
+  Adafruit_GenericDevice *createDevice() {
+    return new Adafruit_GenericDevice(uart_read_impl, uart_write_impl,
+                                      uart_readreg_impl, uart_writereg_impl);
+  }
+};
+
+TMC2209_UART *TMC2209_UART::_instance = nullptr;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial)
+    ;
+  delay(100);
+  Serial.println("TMC2209 Generic Device register read/write test!");
+
+  Serial1.begin(115200);
+
+  TMC2209_UART uart(&Serial1, 0);
+  Adafruit_GenericDevice *device = uart.createDevice();
+  device->begin();
+
+  // Create register object for IOIN
+  Adafruit_BusIO_Register ioin_reg(device,
+                                   TMC2209_IOIN, // device and register address
+                                   4,            // width = 4 bytes
+                                   MSBFIRST,     // byte order
+                                   1);           // address width = 1 byte
+  Serial.print("IOIN = 0x");
+  Serial.println(ioin_reg.read(), HEX);
+
+  // Create RegisterBits for VERSION field (bits 28:24)
+  Adafruit_BusIO_RegisterBits version_bits(
+      &ioin_reg, 8, 24); // 8 bits wide, starting at bit 24
+
+  Serial.println("Reading VERSION...");
+  uint8_t version = version_bits.read();
+
+  Serial.print("VERSION = 0x");
+  Serial.println(version, HEX);
+}
+
+void loop() { delay(1000); }

examples/genericdevice_uarttest/genericdevice_uarttest.ino

@@ -0,0 +1,75 @@
+/* 
+   Abstracted transport for reading and writing data from a UART-based 
+   device such as a TMC2209
+
+   Written with help by Claude! https://claude.ai/chat/335f50b1-3dd8-435e-9139-57ec7ca26a3c
+  (at this time chats are not shareable :(
+*/
+
+#include "Adafruit_GenericDevice.h"
+
+Stream *uart_stream; // Will hold the pointer to our Stream object
+
+Adafruit_GenericDevice *create_uart_device(Stream *serial_port) {
+  uart_stream = serial_port; // Store the Stream pointer
+
+  auto uart_write = [](const uint8_t *buffer, size_t len) -> bool {
+    uart_stream->write(buffer, len);
+    return true;
+  };
+
+  auto uart_read = [](uint8_t *buffer, size_t len) -> bool {
+    uint16_t timeout = 100;
+    while (uart_stream->available() < len && timeout--) {
+      delay(1);
+    }
+    if (timeout == 0) {
+      return false;
+    }
+    for (size_t i = 0; i < len; i++) {
+      buffer[i] = uart_stream->read();
+    }
+    return true;
+  };
+
+  return new Adafruit_GenericDevice(uart_read, uart_write);
+}
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial)
+    ;
+  delay(100);
+
+  Serial.println("Generic Device test!");
+
+  Serial1.begin(115200);
+
+  Adafruit_GenericDevice *device = create_uart_device(&Serial1);
+  device->begin();
+
+  uint8_t write_buf[4] = {0x5, 0x0, 0x0, 0x48};
+  uint8_t read_buf[8];
+
+  Serial.println("Writing data...");
+  if (!device->write(write_buf, 4)) {
+    Serial.println("Write failed!");
+    return;
+  }
+
+  Serial.println("Reading response...");
+  if (!device->read(read_buf, 8)) {
+    Serial.println("Read failed!");
+    return;
+  }
+
+  Serial.print("Got response: ");
+  for (int i = 0; i < 8; i++) {
+    Serial.print("0x");
+    Serial.print(read_buf[i], HEX);
+    Serial.print(" ");
+  }
+  Serial.println();
+}
+
+void loop() { delay(1000); }

library.properties

@@ -1,9 +1,9 @@
 name=Adafruit BusIO
-version=1.16.3
+version=1.17.0
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
-sentence=This is a library for abstracting away I2C and SPI interfacing
+sentence=This is a library for abstracting away UART, I2C and SPI interfacing
-paragraph=This is a library for abstracting away I2C and SPI interfacing
+paragraph=This is a library for abstracting away UART, I2C and SPI interfacing
 category=Signal Input/Output
 url=https://github.com/adafruit/Adafruit_BusIO
 architectures=*