#include "LPC17xx.h"
#include "rtl.h"
#include "stdio.h"
#include "string.h"
#define DS_1(num) (LPC_GPIO1->FIOPIN & (1UL<<(18+num)))
#define DS_2(num) (LPC_GPIO0->FIOPIN & (1UL<<(23+num)))
int count = 0;
char out[50];
char rom[3];
float fTemp1[8];
float fTemp2[4];
void delay_us (unsigned int us)
{
LPC_TIM2->MCR = 0; // disable timer
LPC_TIM2->MR0 = us; // interrupt event on overrun
LPC_TIM2->TC = 0; // reset counter
LPC_TIM2->MCR |= (1 << 1); //reset counter on match
LPC_TIM2->TCR |= (1 << 0); // start Timer2
while (LPC_TIM2->TC);
return;
}
void delay_ms(unsigned int ms)
{
int i;
for (i=0; i < ms; i++)
{
delay_us (1000);
}
}
void InitTIM2 (void)
{
LPC_SC->PCONP |= (1<<22); // Timer2 power on
LPC_SC->PCLKSEL1 |= (1 << 12); // Divide CCLK by 1 for Timer2
LPC_TIM2->TC = 0; // clear timer counter
LPC_TIM2->PC = 0; // clear prescale counter
LPC_TIM2->PR = 0; // clear prescale register
LPC_TIM2->TCR |= (1 << 1); // reset timer
LPC_TIM2->TCR &= ~(1 << 1); // release reset
LPC_TIM2->CTCR = 0x00; // timer mode
LPC_TIM2->PR = 99; // <resolution> uS accuracy @ CCLK/4 Peripheral Clock
LPC_TIM2->MCR |= (1 << 1); //reset counter on match
}
void InitUart0_115200 (void)
{
uint32_t Fdiv = 0;
LPC_SC->PCONP &= ~(1<<3);
LPC_PINCON->PINSEL0 &= ~(3 << 4);
LPC_PINCON->PINSEL0 &= ~(3 << 6);
LPC_SC->PCONP |= (1<<3);
LPC_PINCON->PINSEL0 |= (1 << 4); /* Pin P0.2 used as TXD0 (Com0) */
LPC_PINCON->PINSEL0 |= (1 << 6); /* Pin P0.3 used as RXD0 (Com0) */
Fdiv = (25000000/16)/9600;
LPC_UART0->LCR = 0x83;
LPC_UART0->DLL = Fdiv % 256;
LPC_UART0->DLM = Fdiv / 256;
LPC_UART0->LCR = 0x03;
}
int UART_putChar0 (char c)
{
while (!(LPC_UART0->LSR & 0x20));
return (LPC_UART0->THR = c);
}
void UART_putString0 (char *s)
{
while (*s != 0)
{
UART_putChar0 (*s++);
}
}
void DSOut_1 (unsigned int num)
{
LPC_GPIO1->FIODIR |= (1<<(18+num));
}
void DSIn_1 (unsigned int num)
{
LPC_GPIO1->FIODIR &= ~(1<<(18+num));
}
void DSUp_1 (unsigned int num)
{
LPC_GPIO1->FIOSET |= (1<<(18+num));
}
void DSDown_1 (unsigned int num)
{
LPC_GPIO1->FIOCLR |= (1<<(18+num));
}
char ow_reset_1 (unsigned int num)
{
char ret = 10;
DSOut_1 (num);
DSUp_1 (num);
delay_us (1);
DSDown_1 (num);
delay_us (500);
DSIn_1 (num);
delay_us (80);
if (DS_1(num))
{
ret = 0;
}
else
{
ret = 1;
}
delay_us (400);
return ret;
}
void ow_write_bit_1 (char bit, unsigned int num)
{
if (bit)
{
DSOut_1 (num);
DSUp_1 (num);
delay_us (1);
DSDown_1 (num);
delay_us (10);
DSUp_1 (num);
delay_us (49);
}
else
{
DSOut_1 (num);
DSUp_1 (num);
delay_us (1);
DSDown_1 (num);
delay_us (59);
DSUp_1 (num);
}
}
char ow_read_bit_1 (unsigned int num)
{
char ret = 10;
DSOut_1 (num);
DSUp_1 (num);
delay_us (1);
DSDown_1 (num);
delay_us (10);
DSIn_1 (num);
delay_us (10);
if (DS_1(num))
{
ret = 1;
}
else
{
ret = 0;
}
delay_us (40);
return ret;
}
char ow_read_byte_1(unsigned int num)
{
char i;
char byte=0;
for (i=0;i<8;i++)
{
if(ow_read_bit_1(num)) byte |= (0x01<<i);
delay_us (1);
}
return(byte);
}
void ow_write_byte_1(char byte, unsigned int num)
{
char a;
char temp;
for(a=0;a<8;a++)
{
temp = byte >> a;
temp &=0x01;
ow_write_bit_1(temp, num);
delay_us (1);
}
}
void DSOut_2 (unsigned int num)
{
LPC_GPIO0->FIODIR |= (1<<(23+num));
}
void DSIn_2 (unsigned int num)
{
LPC_GPIO0->FIODIR &= ~(1<<(23+num));
}
void DSUp_2 (unsigned int num)
{
LPC_GPIO0->FIOSET |= (1<<(23+num));
}
void DSDown_2 (unsigned int num)
{
LPC_GPIO0->FIOCLR |= (1<<(23+num));
}
char ow_reset_2 (unsigned int num)
{
char ret = 10;
DSOut_2 (num);
DSUp_2 (num);
delay_us (1);
DSDown_2 (num);
delay_us (500);
DSIn_2 (num);
delay_us (80);
if (DS_2(num))
{
ret = 0;
}
else
{
ret = 1;
}
delay_us (400);
return ret;
}
void ow_write_bit_2 (char bit, unsigned int num)
{
if (bit)
{
DSOut_2 (num);
DSUp_2 (num);
delay_us (1);
DSDown_2 (num);
delay_us (10);
DSUp_2 (num);
delay_us (49);
}
else
{
DSOut_2 (num);
DSUp_2 (num);
delay_us (1);
DSDown_2 (num);
delay_us (59);
DSUp_2 (num);
}
}
char ow_read_bit_2 (unsigned int num)
{
char ret = 10;
DSOut_2 (num);
DSUp_2 (num);
delay_us (1);
DSDown_2 (num);
delay_us (10);
DSIn_2 (num);
delay_us (10);
if (DS_2(num))
{
ret = 1;
}
else
{
ret = 0;
}
delay_us (40);
return ret;
}
char ow_read_byte_2(unsigned int num)
{
char i;
char byte=0;
for (i=0;i<8;i++)
{
if(ow_read_bit_2(num)) byte |= (0x01<<i);
delay_us (1);
}
return(byte);
}
void ow_write_byte_2(char byte, unsigned int num)
{
char a;
char temp;
for(a=0;a<8;a++)
{
temp = byte >> a;
temp &=0x01;
ow_write_bit_2(temp, num);
delay_us (1);
}
}
void DS1 (void)
{
int count = 0;
char out[50];
char rom[3];
float fTemp[8];
count = 0;
while (count < 8)
{
if (ow_reset_1 (count))
{
ow_write_byte_1(0xCC, count);
ow_write_byte_1(0x44, count);
delay_ms (2000);
ow_reset_1(count);
ow_write_byte_1(0xCC, count);
ow_write_byte_1(0xBE, count);
rom[0] = ow_read_byte_1(count);
rom[1] = ow_read_byte_1(count);
fTemp[count] = (float)(rom[0] + (rom[1]<<8))/16;
sprintf(out,"%02.4f - 1.%d\n\n",fTemp[count],count);
UART_putString0 (out);
}
else
{
UART_putString0 ("Not present\n\n");
}
count++;
}
}
void DS2 (void)
{
int count = 0;
char out[50];
char rom[3];
float fTemp[4];
count = 0;
while (count < 4)
{
if (ow_reset_2 (count))
{
ow_write_byte_2(0xCC, count);
ow_write_byte_2(0x44, count);
delay_ms (2000);
ow_reset_2(count);
ow_write_byte_2(0xCC, count);
ow_write_byte_2(0xBE, count);
rom[0] = ow_read_byte_2(count);
rom[1] = ow_read_byte_2(count);
fTemp[count] = (float)(rom[0] + (rom[1]<<8))/16;
sprintf(out,"%02.4f - 2.%d\n\n",fTemp[count],count);
UART_putString0 (out);
}
else
{
UART_putString0 ("Not present\n\n");
}
count++;
}
}
int main (void)
{
SystemInit ();
InitUart0_115200 ();
UART_putString0 ("\n\nStarting ... \n\n");
InitTIM2 ();
while (1)
{
count = 0;
while (count < 8)
{
if (ow_reset_1(count) == 1)
{
ow_write_byte_1(0xCC, count);
ow_write_byte_1(0x44, count);
delay_ms (2000);
ow_reset_1(count);
ow_write_byte_1(0xCC, count);
ow_write_byte_1(0xBE, count);
rom[0] = ow_read_byte_1(count);
rom[1] = ow_read_byte_1(count);
fTemp1[count] = (float)(rom[0] + (rom[1]<<8))/16;
sprintf(out,"%02.4f - 1.%d\n\n",fTemp1[count],count);
UART_putString0 (out);
}
count++;
}
UART_putString0 ("\n\n");
delay_ms (1000);
count = 0;
while (count < 4)
{
if (ow_reset_2(count) == 1)
{
ow_write_byte_2(0xCC, count);
ow_write_byte_2(0x44, count);
delay_ms (2000);
ow_reset_2(count);
ow_write_byte_2(0xCC, count);
ow_write_byte_2(0xBE, count);
rom[0] = ow_read_byte_2(count);
rom[1] = ow_read_byte_2(count);
fTemp2[count] = (float)(rom[0] + (rom[1]<<8))/16;
sprintf(out,"%02.4f - 2.%d\n\n",fTemp2[count],count);
UART_putString0 (out);
}
count++;
}
UART_putString0 ("\n\n");
}
}
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