diff options
Diffstat (limited to 'libraries')
| -rw-r--r-- | libraries/LiquidCrystal/LiquidCrystal.cpp | 324 | ||||
| -rw-r--r-- | libraries/LiquidCrystal/LiquidCrystal.h | 105 | ||||
| -rw-r--r-- | libraries/LiquidCrystal/rules.mk | 29 | ||||
| -rw-r--r-- | libraries/Wire/README | 5 | ||||
| -rw-r--r-- | libraries/Wire/Wire.cpp | 259 | ||||
| -rw-r--r-- | libraries/Wire/Wire.h | 99 | ||||
| -rw-r--r-- | libraries/Wire/rules.mk | 29 |
7 files changed, 850 insertions, 0 deletions
diff --git a/libraries/LiquidCrystal/LiquidCrystal.cpp b/libraries/LiquidCrystal/LiquidCrystal.cpp new file mode 100644 index 0000000..52f0308 --- /dev/null +++ b/libraries/LiquidCrystal/LiquidCrystal.cpp @@ -0,0 +1,324 @@ +#include "LiquidCrystal.h" + +#include <stdio.h> +#include <string.h> +#include "WProgram.h" + +// When the display powers up, it is configured as follows: +// +// 1. Display clear +// 2. Function set: +// DL = 1; 8-bit interface data +// N = 0; 1-line display +// F = 0; 5x8 dot character font +// 3. Display on/off control: +// D = 0; Display off +// C = 0; Cursor off +// B = 0; Blinking off +// 4. Entry mode set: +// I/D = 1; Increment by 1 +// S = 0; No shift +// +// Note, however, that resetting the Arduino doesn't reset the LCD, so we +// can't assume that its in that state when a sketch starts (and the +// LiquidCrystal constructor is called). + +// This library has been modified to be compatible with the LeafLabs Maple; +// very conservative timing is used due to problems with delayMicroseconds() +// that should be fixed in the 0.0.7 release of the libmaple. [bnewbold] + +LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3, + uint8 d4, uint8 d5, uint8 d6, uint8 d7) +{ + init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7); +} + +LiquidCrystal::LiquidCrystal(uint8 rs, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3, + uint8 d4, uint8 d5, uint8 d6, uint8 d7) +{ + init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7); +} + +LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3) +{ + init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0); +} + +LiquidCrystal::LiquidCrystal(uint8 rs, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3) +{ + init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0); +} + +void LiquidCrystal::init(uint8 fourbitmode, uint8 rs, uint8 rw, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3, + uint8 d4, uint8 d5, uint8 d6, uint8 d7) +{ + _rs_pin = rs; + _rw_pin = rw; + _enable_pin = enable; + + _data_pins[0] = d0; + _data_pins[1] = d1; + _data_pins[2] = d2; + _data_pins[3] = d3; + _data_pins[4] = d4; + _data_pins[5] = d5; + _data_pins[6] = d6; + _data_pins[7] = d7; + + pinMode(_rs_pin, OUTPUT); + // we can save 1 pin by not using RW. Indicate by passing 255 instead of pin# + if (_rw_pin != 255) { + pinMode(_rw_pin, OUTPUT); + } + pinMode(_enable_pin, OUTPUT); + + if (fourbitmode) + _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS; + else + _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS; + + // TODO: bnewbold, re-enable this? + begin(16, 1); +} + +void LiquidCrystal::begin(uint8 cols, uint8 lines, uint8 dotsize) { + if (lines > 1) { + _displayfunction |= LCD_2LINE; + } + _numlines = lines; + _currline = 0; + + // for some 1 line displays you can select a 10 pixel high font + if ((dotsize != 0) && (lines == 1)) { + _displayfunction |= LCD_5x10DOTS; + } + + // SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION! + // according to datasheet, we need at least 40ms after power rises above 2.7V + // before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50 + delay(50); // Maple mod + //delayMicroseconds(50000); + // Now we pull both RS and R/W low to begin commands + digitalWrite(_rs_pin, LOW); + digitalWrite(_enable_pin, LOW); + if (_rw_pin != 255) { + digitalWrite(_rw_pin, LOW); + } + + //put the LCD into 4 bit or 8 bit mode + if (! (_displayfunction & LCD_8BITMODE)) { + // this is according to the hitachi HD44780 datasheet + // figure 24, pg 46 + + // we start in 8bit mode, try to set 4 bit mode + write4bits(0x03); + delay(5); // Maple mod + //delayMicroseconds(4500); // wait min 4.1ms + + // second try + write4bits(0x03); + delay(5); // Maple mod + //delayMicroseconds(4500); // wait min 4.1ms + + // third go! + write4bits(0x03); + delay(1); // Maple mod + //delayMicroseconds(150); + + // finally, set to 8-bit interface + write4bits(0x02); + } else { + // this is according to the hitachi HD44780 datasheet + // page 45 figure 23 + + // Send function set command sequence + command(LCD_FUNCTIONSET | _displayfunction); + delay(5); // Maple mod + //delayMicroseconds(4500); // wait more than 4.1ms + + // second try + command(LCD_FUNCTIONSET | _displayfunction); + delay(1); // Maple mod + //delayMicroseconds(150); + + // third go + command(LCD_FUNCTIONSET | _displayfunction); + } + + // finally, set # lines, font size, etc. + command(LCD_FUNCTIONSET | _displayfunction); + + // turn the display on with no cursor or blinking default + _displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF; + display(); + + // clear it off + clear(); + + // Initialize to default text direction (for romance languages) + _displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT; + // set the entry mode + command(LCD_ENTRYMODESET | _displaymode); + +} + +/********** high level commands, for the user! */ +void LiquidCrystal::clear() +{ + command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero + delay(2); // Maple mod + //delayMicroseconds(2000); // this command takes a long time! +} + +void LiquidCrystal::home() +{ + command(LCD_RETURNHOME); // set cursor position to zero + delay(2); // Maple mod + //delayMicroseconds(2000); // this command takes a long time! +} + +void LiquidCrystal::setCursor(uint8 col, uint8 row) +{ + int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 }; + if ( row > _numlines ) { + row = _numlines-1; // we count rows starting w/0 + } + + command(LCD_SETDDRAMADDR | (col + row_offsets[row])); +} + +// Turn the display on/off (quickly) +void LiquidCrystal::noDisplay() { + _displaycontrol &= ~LCD_DISPLAYON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} +void LiquidCrystal::display() { + _displaycontrol |= LCD_DISPLAYON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} + +// Turns the underline cursor on/off +void LiquidCrystal::noCursor() { + _displaycontrol &= ~LCD_CURSORON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} +void LiquidCrystal::cursor() { + _displaycontrol |= LCD_CURSORON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} + +// Turn on and off the blinking cursor +void LiquidCrystal::noBlink() { + _displaycontrol &= ~LCD_BLINKON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} +void LiquidCrystal::blink() { + _displaycontrol |= LCD_BLINKON; + command(LCD_DISPLAYCONTROL | _displaycontrol); +} + +// These commands scroll the display without changing the RAM +void LiquidCrystal::scrollDisplayLeft(void) { + command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT); +} +void LiquidCrystal::scrollDisplayRight(void) { + command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT); +} + +// This is for text that flows Left to Right +void LiquidCrystal::leftToRight(void) { + _displaymode |= LCD_ENTRYLEFT; + command(LCD_ENTRYMODESET | _displaymode); +} + +// This is for text that flows Right to Left +void LiquidCrystal::rightToLeft(void) { + _displaymode &= ~LCD_ENTRYLEFT; + command(LCD_ENTRYMODESET | _displaymode); +} + +// This will 'right justify' text from the cursor +void LiquidCrystal::autoscroll(void) { + _displaymode |= LCD_ENTRYSHIFTINCREMENT; + command(LCD_ENTRYMODESET | _displaymode); +} + +// This will 'left justify' text from the cursor +void LiquidCrystal::noAutoscroll(void) { + _displaymode &= ~LCD_ENTRYSHIFTINCREMENT; + command(LCD_ENTRYMODESET | _displaymode); +} + +// Allows us to fill the first 8 CGRAM locations +// with custom characters +void LiquidCrystal::createChar(uint8 location, uint8 charmap[]) { + location &= 0x7; // we only have 8 locations 0-7 + command(LCD_SETCGRAMADDR | (location << 3)); + for (int i=0; i<8; i++) { + write(charmap[i]); + } +} + +/*********** mid level commands, for sending data/cmds */ + +inline void LiquidCrystal::command(uint8 value) { + send(value, LOW); +} + +inline void LiquidCrystal::write(uint8 value) { + send(value, HIGH); +} + +/************ low level data pushing commands **********/ + +// write either command or data, with automatic 4/8-bit selection +void LiquidCrystal::send(uint8 value, uint8 mode) { + digitalWrite(_rs_pin, mode); + + // if there is a RW pin indicated, set it low to Write + if (_rw_pin != 255) { + digitalWrite(_rw_pin, LOW); + } + + if (_displayfunction & LCD_8BITMODE) { + write8bits(value); + } else { + write4bits(value>>4); + write4bits(value); + } +} + +void LiquidCrystal::pulseEnable(void) { + digitalWrite(_enable_pin, LOW); + delay(1); // Maple mod + //delayMicroseconds(1); + digitalWrite(_enable_pin, HIGH); + delay(1); // Maple mod + //delayMicroseconds(1); // enable pulse must be >450ns + digitalWrite(_enable_pin, LOW); + delay(1); // Maple mod + //delayMicroseconds(100); // commands need > 37us to settle +} + +void LiquidCrystal::write4bits(uint8 value) { + for (int i = 0; i < 4; i++) { + pinMode(_data_pins[i], OUTPUT); + digitalWrite(_data_pins[i], (value >> i) & 0x01); + } + + pulseEnable(); +} + +void LiquidCrystal::write8bits(uint8 value) { + for (int i = 0; i < 8; i++) { + pinMode(_data_pins[i], OUTPUT); + digitalWrite(_data_pins[i], (value >> i) & 0x01); + } + + pulseEnable(); +} diff --git a/libraries/LiquidCrystal/LiquidCrystal.h b/libraries/LiquidCrystal/LiquidCrystal.h new file mode 100644 index 0000000..0baf543 --- /dev/null +++ b/libraries/LiquidCrystal/LiquidCrystal.h @@ -0,0 +1,105 @@ +#ifndef LiquidCrystal_h +#define LiquidCrystal_h + +//#include <inttypes.h> +#include "wirish.h" +#include "Print.h" + +// commands +#define LCD_CLEARDISPLAY 0x01 +#define LCD_RETURNHOME 0x02 +#define LCD_ENTRYMODESET 0x04 +#define LCD_DISPLAYCONTROL 0x08 +#define LCD_CURSORSHIFT 0x10 +#define LCD_FUNCTIONSET 0x20 +#define LCD_SETCGRAMADDR 0x40 +#define LCD_SETDDRAMADDR 0x80 + +// flags for display entry mode +#define LCD_ENTRYRIGHT 0x00 +#define LCD_ENTRYLEFT 0x02 +#define LCD_ENTRYSHIFTINCREMENT 0x01 +#define LCD_ENTRYSHIFTDECREMENT 0x00 + +// flags for display on/off control +#define LCD_DISPLAYON 0x04 +#define LCD_DISPLAYOFF 0x00 +#define LCD_CURSORON 0x02 +#define LCD_CURSOROFF 0x00 +#define LCD_BLINKON 0x01 +#define LCD_BLINKOFF 0x00 + +// flags for display/cursor shift +#define LCD_DISPLAYMOVE 0x08 +#define LCD_CURSORMOVE 0x00 +#define LCD_MOVERIGHT 0x04 +#define LCD_MOVELEFT 0x00 + +// flags for function set +#define LCD_8BITMODE 0x10 +#define LCD_4BITMODE 0x00 +#define LCD_2LINE 0x08 +#define LCD_1LINE 0x00 +#define LCD_5x10DOTS 0x04 +#define LCD_5x8DOTS 0x00 + +class LiquidCrystal : public Print { +public: + LiquidCrystal(uint8 rs, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3, + uint8 d4, uint8 d5, uint8 d6, uint8 d7); + LiquidCrystal(uint8 rs, uint8 rw, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3, + uint8 d4, uint8 d5, uint8 d6, uint8 d7); + LiquidCrystal(uint8 rs, uint8 rw, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3); + LiquidCrystal(uint8 rs, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3); + + void init(uint8 fourbitmode, uint8 rs, uint8 rw, uint8 enable, + uint8 d0, uint8 d1, uint8 d2, uint8 d3, + uint8 d4, uint8 d5, uint8 d6, uint8 d7); + + void begin(uint8 cols, uint8 rows, uint8 charsize = LCD_5x8DOTS); + + void clear(); + void home(); + + void noDisplay(); + void display(); + void noBlink(); + void blink(); + void noCursor(); + void cursor(); + void scrollDisplayLeft(); + void scrollDisplayRight(); + void leftToRight(); + void rightToLeft(); + void autoscroll(); + void noAutoscroll(); + + void createChar(uint8, uint8[]); + void setCursor(uint8, uint8); + virtual void write(uint8); + void command(uint8); +private: + void send(uint8, uint8); + void write4bits(uint8); + void write8bits(uint8); + void pulseEnable(); + + uint8 _rs_pin; // LOW: command. HIGH: character. + uint8 _rw_pin; // LOW: write to LCD. HIGH: read from LCD. + uint8 _enable_pin; // activated by a HIGH pulse. + uint8 _data_pins[8]; + + uint8 _displayfunction; + uint8 _displaycontrol; + uint8 _displaymode; + + uint8 _initialized; + + uint8 _numlines,_currline; +}; + +#endif diff --git a/libraries/LiquidCrystal/rules.mk b/libraries/LiquidCrystal/rules.mk new file mode 100644 index 0000000..7b18203 --- /dev/null +++ b/libraries/LiquidCrystal/rules.mk @@ -0,0 +1,29 @@ +# Standard things +sp := $(sp).x +dirstack_$(sp) := $(d) +d := $(dir) +BUILDDIRS += $(BUILD_PATH)/$(d) + +# Local flags +CFLAGS_$(d) := $(WIRISH_INCLUDES) $(LIBMAPLE_INCLUDES) + +# Local rules and targets +cSRCS_$(d) := + +cppSRCS_$(d) := LiquidCrystal.cpp + +cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%) +cppFILES_$(d) := $(cppSRCS_$(d):%=$(d)/%) + +OBJS_$(d) := $(cFILES_$(d):%.c=$(BUILD_PATH)/%.o) \ + $(cppFILES_$(d):%.cpp=$(BUILD_PATH)/%.o) +DEPS_$(d) := $(OBJS_$(d):%.o=%.d) + +$(OBJS_$(d)): TGT_CFLAGS := $(CFLAGS_$(d)) + +TGT_BIN += $(OBJS_$(d)) + +# Standard things +-include $(DEPS_$(d)) +d := $(dirstack_$(sp)) +sp := $(basename $(sp))
\ No newline at end of file diff --git a/libraries/Wire/README b/libraries/Wire/README new file mode 100644 index 0000000..353d51a --- /dev/null +++ b/libraries/Wire/README @@ -0,0 +1,5 @@ +Wirish soft (bit-banged) implementation of the Wire I2C library. + +This implementation is synchronous, and thus supports only a subset of +the full Wire interface. An asynchronous hardware version implemented +with DMA is expected for Maple IDE release 0.1.0. diff --git a/libraries/Wire/Wire.cpp b/libraries/Wire/Wire.cpp new file mode 100644 index 0000000..736bd25 --- /dev/null +++ b/libraries/Wire/Wire.cpp @@ -0,0 +1,259 @@ +/****************************************************************************** + * The MIT License + * + * Copyright (c) 2010 LeafLabs LLC. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + *****************************************************************************/ + +/** + * @brief Wire library, ported from Arduino. Provides a simplistic + * interface to i2c. + */ + +#include "Wire.h" +#include "wirish.h" + +/* low level conventions: + * - SDA/SCL idle high (expected high) + * - always start with i2c_delay rather than end + */ +uint32 i2c_delay = 1; + +void i2c_start(Port port) { + I2C_DELAY; + digitalWrite(port.sda,LOW); + I2C_DELAY; + digitalWrite(port.scl,LOW); +} + +void i2c_stop(Port port) { + I2C_DELAY; + digitalWrite(port.scl,HIGH); + I2C_DELAY; + digitalWrite(port.sda,HIGH); +} + +boolean i2c_get_ack(Port port) { + I2C_DELAY; + digitalWrite(port.scl,LOW); + I2C_DELAY; + digitalWrite(port.sda,HIGH); + I2C_DELAY; + digitalWrite(port.scl,HIGH); + I2C_DELAY; + + if (!digitalRead(port.sda)) { + I2C_DELAY; + digitalWrite(port.scl,LOW); + return true; + } else { + I2C_DELAY; + digitalWrite(port.scl,LOW); + return false; + } +} + +void i2c_send_ack(Port port) { + I2C_DELAY; + digitalWrite(port.sda,LOW); + I2C_DELAY; + digitalWrite(port.scl,HIGH); + I2C_DELAY; + digitalWrite(port.scl,LOW); +} + +void i2c_send_nack(Port port) { + I2C_DELAY; + digitalWrite(port.sda,HIGH); + I2C_DELAY; + digitalWrite(port.scl,HIGH); +} + +uint8 i2c_shift_in(Port port) { + uint8 data = 0; + + int i; + for (i=0;i<8;i++) { + I2C_DELAY; + digitalWrite(port.scl,HIGH); + I2C_DELAY; + data += digitalRead(port.sda) << (7-i); + I2C_DELAY; + digitalWrite(port.scl,LOW); + } + + return data; +} + +void i2c_shift_out(Port port, uint8 val) { + int i; + for (i=0;i<8;i++) { + I2C_DELAY; + digitalWrite(port.sda, !!(val & (1 << (7 - i)))); + I2C_DELAY; + digitalWrite(port.scl, HIGH); + I2C_DELAY; + digitalWrite(port.scl, LOW); + } +} + +TwoWire::TwoWire() { + i2c_delay = 0; + rx_buf_idx = 0; + rx_buf_len = 0; + tx_addr = 0; + tx_buf_idx = 0; + tx_buf_overflow = false; +} + +/* + * Sets pins SDA and SCL to OUPTUT_OPEN_DRAIN, joining I2C bus as + * master. If you want them to be some other pins, use begin(uint8, + * uint8); + */ +void TwoWire::begin() { + begin(SDA, SCL); +} + +/* + * Joins I2C bus as master on given SDA and SCL pins. + */ +void TwoWire::begin(uint8 sda, uint8 scl) { + port.sda = sda; + port.scl = scl; + pinMode(scl, OUTPUT_OPEN_DRAIN); + pinMode(sda, OUTPUT_OPEN_DRAIN); + digitalWrite(scl, HIGH); + digitalWrite(sda, HIGH); +} + +void TwoWire::beginTransmission(uint8 slave_address) { + tx_addr = slave_address; + tx_buf_idx = 0; + tx_buf_overflow = false; + rx_buf_idx = 0; + rx_buf_len = 0; +} + +void TwoWire::beginTransmission(int slave_address) { + beginTransmission((uint8)slave_address); +} + +uint8 TwoWire::endTransmission(void) { + if (tx_buf_overflow) return EDATA; + + i2c_start(port); + + i2c_shift_out(port, (tx_addr << 1) | I2C_WRITE); + if (!i2c_get_ack(port)) return ENACKADDR; + + // shift out the address we're transmitting to + for (uint8 i = 0; i < tx_buf_idx; i++) { + uint8 ret = writeOneByte(tx_buf[i]); + if (ret) return ret; // SUCCESS is 0 + } + + i2c_stop(port); + + tx_buf_idx = 0; + tx_buf_overflow = false; + return SUCCESS; +} + +uint8 TwoWire::requestFrom(uint8 address, int num_bytes) { + if (num_bytes > WIRE_BUFSIZ) num_bytes = WIRE_BUFSIZ; + + rx_buf_idx = 0; + rx_buf_len = 0; + while (rx_buf_len < num_bytes) { + if(!readOneByte(address, rx_buf + rx_buf_len)) rx_buf_len++; + else break; + } + return rx_buf_len; +} + +uint8 TwoWire::requestFrom(int address, int numBytes) { + return TwoWire::requestFrom((uint8)address, (uint8) numBytes); +} + +void TwoWire::send(uint8 value) { + if (tx_buf_idx == WIRE_BUFSIZ) { + tx_buf_overflow = true; + return; + } + + tx_buf[tx_buf_idx++] = value; +} + +void TwoWire::send(uint8* buf, int len) { + for (uint8 i = 0; i < len; i++) send(buf[i]); +} + +void TwoWire::send(int value) { + send((uint8)value); +} + +void TwoWire::send(int* buf, int len) { + send((uint8*)buf, (uint8)len); +} + +void TwoWire::send(char* buf) { + uint8 *ptr = (uint8*)buf; + while(*ptr) { + send(*ptr); + ptr++; + } +} + +uint8 TwoWire::available() { + return rx_buf_len - rx_buf_idx; +} + +uint8 TwoWire::receive() { + if (rx_buf_idx == rx_buf_len) return 0; + return rx_buf[rx_buf_idx++]; +} + +// private methods + +uint8 TwoWire::writeOneByte(uint8 byte) { + i2c_shift_out(port, byte); + if (!i2c_get_ack(port)) return ENACKTRNS; + + return SUCCESS; +} + +uint8 TwoWire::readOneByte(uint8 address, uint8 *byte) { + i2c_start(port); + + i2c_shift_out(port, (address << 1) | I2C_READ); + if (!i2c_get_ack(port)) return ENACKADDR; + + *byte = i2c_shift_in(port); + + i2c_send_nack(port); + i2c_stop(port); + + return SUCCESS; // no real way of knowing, but be optimistic! +} + +// Declare the instance that the users of the library can use +TwoWire Wire; + diff --git a/libraries/Wire/Wire.h b/libraries/Wire/Wire.h new file mode 100644 index 0000000..62e37bd --- /dev/null +++ b/libraries/Wire/Wire.h @@ -0,0 +1,99 @@ +/* ***************************************************************************** + * The MIT License + * + * Copyright (c) 2010 LeafLabs LLC. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * ****************************************************************************/ + +/** + * @brief Wire library, ported from Arduino. Provides a lean + * interface to I2C (two-wire) communication. + */ + +#include "wirish.h" + +#ifndef _WIRE_H_ +#define _WIRE_H_ + +typedef struct { + uint8 scl; + uint8 sda; +} Port; + +/* You must update the online docs if you change this value. */ +#define WIRE_BUFSIZ 32 + +/* return codes from endTransmission() */ +#define SUCCESS 0 /* transmission was successful */ +#define EDATA 1 /* too much data */ +#define ENACKADDR 2 /* received nack on transmit of address */ +#define ENACKTRNS 3 /* received nack on transmit of data */ +#define EOTHER 4 /* other error */ + +#define SDA 20 +#define SCL 21 + +#define I2C_WRITE 0 +#define I2C_READ 1 + +#define I2C_DELAY do{for(int i=0;i<50;i++) {asm volatile("nop");}}while(0) + +class TwoWire { + private: + uint8 rx_buf[WIRE_BUFSIZ]; /* receive buffer */ + uint8 rx_buf_idx; /* first unread idx in rx_buf */ + uint8 rx_buf_len; /* number of bytes read */ + + uint8 tx_addr; /* address transmitting to */ + uint8 tx_buf[WIRE_BUFSIZ]; /* transmit buffer */ + uint8 tx_buf_idx; /* next idx available in tx_buf, -1 overflow */ + boolean tx_buf_overflow; + Port port; + uint8 writeOneByte(uint8); + uint8 readOneByte(uint8, uint8*); + public: + TwoWire(); + void begin(); + void begin(uint8, uint8); + void beginTransmission(uint8); + void beginTransmission(int); + uint8 endTransmission(void); + uint8 requestFrom(uint8, int); + uint8 requestFrom(int, int); + void send(uint8); + void send(uint8*, int); + void send(int); + void send(int*, int); + void send(char*); + uint8 available(); + uint8 receive(); +}; + +void i2c_start(Port port); +void i2c_stop(Port port); +boolean i2c_get_ack(Port port); +void i2c_send_ack(Port port); +void i2c_send_nack(Port port); +uint8 i2c_shift_in(Port port); +void i2c_shift_out(Port port, uint8 val); + +extern TwoWire Wire; + +#endif // _WIRE_H_ diff --git a/libraries/Wire/rules.mk b/libraries/Wire/rules.mk new file mode 100644 index 0000000..71f5e75 --- /dev/null +++ b/libraries/Wire/rules.mk @@ -0,0 +1,29 @@ +# Standard things +sp := $(sp).x +dirstack_$(sp) := $(d) +d := $(dir) +BUILDDIRS += $(BUILD_PATH)/$(d) + +# Local flags +CFLAGS_$(d) := $(WIRISH_INCLUDES) $(LIBMAPLE_INCLUDES) + +# Local rules and targets +cSRCS_$(d) := + +cppSRCS_$(d) := Wire.cpp + +cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%) +cppFILES_$(d) := $(cppSRCS_$(d):%=$(d)/%) + +OBJS_$(d) := $(cFILES_$(d):%.c=$(BUILD_PATH)/%.o) \ + $(cppFILES_$(d):%.cpp=$(BUILD_PATH)/%.o) +DEPS_$(d) := $(OBJS_$(d):%.o=%.d) + +$(OBJS_$(d)): TGT_CFLAGS := $(CFLAGS_$(d)) + +TGT_BIN += $(OBJS_$(d)) + +# Standard things +-include $(DEPS_$(d)) +d := $(dirstack_$(sp)) +sp := $(basename $(sp))
\ No newline at end of file |