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Threads
Dependencies: mbed C12832 LM75B
Diff: main.cpp
- Revision:
- 2:9e757151de9b
- Parent:
- 1:6484448034e3
- Child:
- 3:4d612f16ad84
diff -r 6484448034e3 -r 9e757151de9b main.cpp --- a/main.cpp Thu Oct 18 13:09:21 2012 +0000 +++ b/main.cpp Fri Oct 26 21:25:35 2012 +0000 @@ -1,137 +1,36 @@ -/* - * NXP LM75B temperature sensor test - * www.nxp.com/pip/LM75B_2.html - * - * Expecting to use the pins 9 and 10 for I2C bus - * these pins should be pulled-up properly. +/* Copyright (c) 2012 cstyles, MIT License + * + * 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 temperature read out will be shown on terminal on the PC screen. - * - * In this demo code, two LM75B devices can be driven. - * These two devices should have different I2C address setting - * using its address pins (LM75B's A0 to A2 (pins 5 to 7)). - * One LM75B should have all those pins tied to GND. - * And another should have the pin A0(pin7) pulled-up. + * The above copyright notice and this permission notice shall be included in all copies or + * substantial portions of the Software. * - * From the software, those devices can be accessed by I2C addresses - * "0x90" and "0x92". - * It will not be as "0x90" and "0x91" because the address has - * 7 bit only and stuffed to left. So the "A0" setting become 0xX2. - * The LSB does not care because it will be set by I2C libraly when - * it transfer the data for read and write. + * 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. */ #include "mbed.h" - -// LM75B IIC address -#define LM75B_ADDR 0x90 - -// LM75B registers -#define Conf 0x01 -#define Temp 0x00 -#define Tos 0x03 -#define Thyst 0x02 - - -DigitalOut led[] = { LED4, LED3, LED2, LED1 }; -Serial pc(USBTX, USBRX); // tx, rx - -I2C i2c( p28, p27 ); // sda, scl - - -void iic_write( char addr, char reg, char data ); -char iic_read( char addr, char reg ); -short iic_read_short( char addr, char reg ); -void iic_error( void ); - -void init_temp_sensor( char dev_num ); -float get_temp( char dev_num ); +#include "LM75B.h" +#include "C12832_lcd.h" -int main() { - int i; - - init_temp_sensor( 0 ); - - while(1) { - pc.printf( " (%d) temp[0]=%6.3f, \n", i++, get_temp( 0 ) ); - wait( 1 ); - } -} +C12832_LCD lcd; +LM75B tmp(p28,p27); -void init_temp_sensor( char dev_num ) -{ - dev_num <<= 1; - iic_write( LM75B_ADDR | dev_num, Conf, 0x00 ); // configuration - pc.printf( "sensor[%d] : Conf register read out = 0x%02X\n", dev_num, iic_read( LM75B_ADDR | dev_num, Conf ) ); - pc.printf( "sensor[%d] : Tos register read out = 0x%04X\n", dev_num, iic_read_short( LM75B_ADDR | dev_num, Tos ) ); - pc.printf( "sensor[%d] : Thyst register read out = 0x%04X\n", dev_num, iic_read_short( LM75B_ADDR | dev_num, Thyst ) ); -} - - -float get_temp( char dev_num ) -{ - dev_num <<= 1; - - return ( (float)(iic_read_short( LM75B_ADDR | dev_num, Temp )) / 256.0 ); -} - -void iic_write( char addr, char reg, char data ) +int main () { - char cmd[2]; - - cmd[ 0 ] = reg; - cmd[ 1 ] = data; - - if ( i2c.write( addr, cmd, 2) ) - iic_error(); -} - -char iic_read( char addr, char reg ) -{ - char cmd; - int nack; - - cmd = reg; - - nack = i2c.write( addr, &cmd, 1); // Send command string - nack |= i2c.read( addr, &cmd, 1); // Send command string - - if ( nack ) - iic_error(); - - return ( cmd ); -} - -short iic_read_short( char addr, char reg ) -{ - char cmd[ 2 ]; - int nack; - - cmd[ 0 ] = reg; - - nack = i2c.write( addr, cmd, 1); // Send command string - nack |= i2c.read( addr, cmd, 2); // Send command string - - if ( nack ) - iic_error(); - - return ( ((short)cmd[ 0 ]) << 8 | cmd[ 1 ] ); -} + while (1) { + lcd.cls(); + lcd.locate(0,3); + lcd.printf("%.2f\n",tmp.read()); + wait(1.0); + } - -void iic_error( void ) -{ - pc.printf( "I2C error\n" ); - - for ( int i = 0; i < 4; i++ ) - led[ i ] = i & 0x01; - - wait ( 0.2 ); - - for ( int i = 0; i < 4; i++ ) - led[ i ] = !(i & 0x01); - - wait ( 0.2 ); } -