--- /dev/null
+/**************************************************************************/
+/*!
+ @file ds18b20.c
+ @author Albertas Mickenas (mic@wemakethings.net)
+ @date 8 August 2012
+ @version 1.0
+
+ @section DESCRIPTION
+ Driver for DALLAS DS18B20 temperature sensor.
+
+ @section Example
+
+ @code
+ #include "core/cpu/cpu.h"
+ #include "drivers/sensors/ds18b20/ds18b20.h"
+
+ int main(void) {
+ cpuInit();
+
+ int32_t temp = 0;
+
+ // Initialise the DS18B20
+ ds18b20Init(3, 0, &IOCON_PIO3_0);
+ while (1) {
+ temp = ds18b20GetTemperature();
+
+ // Use modulus operator to display decimal value
+ printf("Current Temperature: %d.%d C\n", temp / 10000, temp % 10000);
+ }
+ }
+ @endcode
+
+ @section LICENSE
+
+ Software License Agreement (BSD License)
+
+ Copyright (c) 2010, microBuilder SARL
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. Neither the name of the copyright holders nor the
+ names of its contributors may be used to endorse or promote products
+ derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+
+#include "ds18b20.h"
+#include "core/gpio/gpio.h"
+#include "core/timer16/timer16.h"
+
+#define CMD_CONVERTTEMP 0x44
+#define CMD_RSCRATCHPAD 0xbe
+#define CMD_WSCRATCHPAD 0x4e
+#define CMD_CPYSCRATCHPAD 0x48
+#define CMD_RECEEPROM 0xb8
+#define CMD_RPWRSUPPLY 0xb4
+#define CMD_SEARCHROM 0xf0
+#define CMD_READROM 0x33
+#define CMD_MATCHROM 0x55
+#define CMD_SKIPROM 0xcc
+#define CMD_ALARMSEARCH 0xec
+#define DECIMAL_STEPS_12BIT 625 //.0625
+
+uint32_t portNum = 0;
+uint32_t bitPos = 0;
+
+inline void pullLineLow() {
+ gpioSetDir(portNum, bitPos, gpioDirection_Output);
+ gpioSetValue(portNum, bitPos, 0);
+}
+
+inline void releaseLine() {
+ gpioSetDir(portNum, bitPos, gpioDirection_Input);
+}
+
+inline void delayUs(uint16_t us) {
+ timer16DelayUS(1, us);
+}
+
+inline uint32_t readLineState() {
+ return gpioGetValue(portNum, bitPos );
+}
+
+void writeBit(uint8_t bit){
+ //Pull line low for 1uS
+ pullLineLow();
+ delayUs(1);
+ //If we want to write 1, release the line (if not will keep low)
+ if(bit) {
+ releaseLine();
+ }
+ //Wait for 60uS and release the line
+ delayUs(60);
+ releaseLine();
+}
+
+uint8_t readBit(void){
+ uint8_t bit = 0;
+ //Pull line low for 1uS
+ pullLineLow();
+ delayUs(1);
+ //Release line and wait for 14uS
+ releaseLine();
+ delayUs(14);
+ //Read line value
+ if(readLineState()){
+ bit=1;
+ }
+ //Wait for 45uS to end and return read value
+ delayUs(45);
+ return bit;
+}
+
+uint8_t readByte(void){
+ uint8_t i = 8, n = 0;
+ while(i--){
+ //Shift one position right and store read value
+ n >>= 1;
+ n |= (readBit() << 7);
+ }
+ return n;
+}
+
+void writeByte(uint8_t b){
+ uint8_t i = 8;
+ while(i--){
+ //Write actual bit and shift one position right to make the next bit ready
+ writeBit(b & 1);
+ b >>= 1;
+ }
+}
+
+uint32_t reset(){
+ uint32_t i;
+ //Pull line low and wait for 480uS
+ pullLineLow();
+ delayUs(480);
+ //Release line and wait for 60uS
+ releaseLine();
+ delayUs(60);
+ //Store line value and wait until the completion of 480uS period
+ i = readLineState();
+ delayUs(420);
+ //Return the value read from the presence pulse (0=OK, 1=WRONG)
+ return i;
+}
+
+/*!
+ @brief Initializes DS18B20 sensor driver.
+*/
+
+void ds18b20Init(uint32_t portNumber, uint32_t bitPosition, volatile uint32_t *ioconReg) {
+ portNum = portNumber;
+ bitPos = bitPosition;
+ timer16Init(1, TIMER16_DEFAULTINTERVAL);
+ timer16Enable(1);
+ gpioSetPullup(ioconReg, gpioPullupMode_Inactive);
+}
+
+/*!
+ @brief Returns temperature read from BS18B20
+
+ @note Reading is returned mutiplied by 10000 i.e.
+ for 25.8750 degrees the result will be 258750
+*/
+uint32_t ds18b20GetTemparature(){
+ //Reset, skip ROM and start temperature conversion
+ if(reset()) {
+ printf("DS18B20 is not responding%s", CFG_PRINTF_NEWLINE);
+ return 0;
+ }
+ writeByte(CMD_SKIPROM);
+ writeByte(CMD_CONVERTTEMP);
+
+ //Wait until conversion is complete
+ uint16_t timeout = 0xFFFF;
+ while(!readBit() && timeout > 0) {
+ timeout--;
+ }
+ if(0 == timeout) {
+ printf("BS18B20 temperature conversion has timed out%s", CFG_PRINTF_NEWLINE);
+ return 0;
+ }
+
+ //Reset, skip ROM and send command to read Scratchpad
+ if(reset()) {
+ printf("DS18B20 is not responding%s", CFG_PRINTF_NEWLINE);
+ return 0;
+ }
+ writeByte(CMD_SKIPROM);
+ writeByte(CMD_RSCRATCHPAD);
+
+ uint8_t scratchpad[2] = {0, 0};
+ //Read Scratchpad (only 2 first bytes)
+ scratchpad[0] = readByte();
+ scratchpad[1] = readByte();
+
+ //Store temperature integer digits and decimal digits
+ int8_t digit = scratchpad[0] >> 4;
+ digit |= (scratchpad[1] & 0x7) << 4;
+ //Store decimal digits
+ uint16_t decimal = scratchpad[0] & 0xf;
+ decimal *= DECIMAL_STEPS_12BIT;
+
+ return digit * 10000 + decimal;
+}
+
--- /dev/null
+/**************************************************************************/
+/*!
+ @file lm75b.h
+ @author K. Townsend (microBuilder.eu)
+ @date 22 March 2010
+ @version 0.10
+
+ @section LICENSE
+
+ Software License Agreement (BSD License)
+
+ Copyright (c) 2010, microBuilder SARL
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. Neither the name of the copyright holders nor the
+ names of its contributors may be used to endorse or promote products
+ derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+
+#ifndef _DS18B20_H_
+#define _DS18B20_H_
+
+#include "core/gpio/gpio.h"
+#include "core/timer16/timer16.h"
+
+
+void ds18b20Init(uint32_t portNum, uint32_t bitPos, volatile uint32_t *ioconReg);
+uint32_t ds18b20GetTemparature();
+#endif
+
+
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