STM8S-Discovery third program

Collect

/******** STM8S-Discovery DS18B20 Test ********
* Version.........: 1.0
* Target.......: STM8S105C6
* File name.......: main.c
* Compiler.......: IAR for STM8 V1.1
**********************************************/

#include
#include

#define UART_BAUD 9600 //Baud rate
#define F_MASTER 16000000 //Master frequency

#define DS18B20_DQ_OUT PG_DDR_DDR0 = 1 //Output
#define DS18B20_DQ_IN PG_DDR_DDR0 = 0 //Input
#define DS18B20_DQ_HIGH PG_ODR_ODR0 = 1 //Pull high
#define DS18B20_DQ_LOW PG_ODR_ODR0 = 0 //Pull down
#define DS18B20_DQ_PULL_UP PG_CR1_C10 = 1 //Pull up
#define DS18B20_DQ_FLOATING PG_CR1_C10 = 0 //Floating #define
DS18B20_DQ_PUSH_PULL PG_CR1_C10 = 1 //Push-pull
#define DS18B20_DQ_OPEN_DRAIN PG_CR1_C10 = 0 //Open drain
#define DS18B20_DQ_VALUE PG_IDR_IDR0 //DQ value

//Serial port configuration
//Data bits: 8
//Stop bits: 1
//Parity bit: None
void UART_Init(void)
{
    UART2_CR2_TEN = 1;
    UART2_CR2_REN = 1;
    UART2_CR2_RIEN = 1;
    UART2_BRR2 = ((unsigned char)((F_MASTER / UART_BAUD) & 0x0f)) + (((unsigned char)((F_MASTER / UART_BAUD) >> 8)) &0xf0);
    UART2_BRR1 = ((unsigned char)((F_MASTER / UART_BAUD) >> 4));
}

void UART_TxByte (unsigned char _data)
{
    while (UART2_SR_TXE == 0);
    UART2_DR = _data;
}

int putchar(int c)
{
    UART_TxByte(c);
    return c;
}

void _delay_us(unsigned int i)
{
    i *= 3;
    while(--i);
}

void _delay_ms(unsigned int i)
{
    while(i--)
    {
        _delay_us (1000);
    }
}

void DS18B20_Init(void)
{
    DS18B20_DQ_OUT;
    DS18B20_DQ_PUSH_PULL;
    DS18B20_DQ_HIGH;
    _delay_us(10);
    DS18B20_DQ_LOW;
    _delay_us(600); //Reset pulse

    DS18B20_DQ_IN;
    DS18B20_ DQ_PULL_UP;
    _delay_us(100);
    while(DS18B20_DQ_VALUE == 1);
    _delay_us(400);
}

void DS18B20_WriteByte(unsigned char _data)
{
    unsigned char i = 0;

    DS18B20_DQ_OUT;
    for (i = 0; i < 8; i++)
    {
        DS18B2 0_DQ_LOW;
        _delay_us(2);
        if (_data & 0x01)
        {
            DS18B20_DQ_HIGH;
        }
        _data >>= 1;
        _delay_us(60);
        DS18B20_DQ_HIGH;
    }
}

unsigned char DS18B20_ReadByte(void)
{
    unsigned char i = 0, _data = 0;

    for (i = 0; i < 8; i++)
    {
        DS18B20_DQ_OUT;
        DS18B20_DQ_LOW;
        _delay_us(5);
        _data >>= 1;
        DS18B20_DQ_HIGH;
        DS18B20_DQ_IN;
        if (DS18B20_DQ_VALUE)
        {
            _data |= 0x80;
        }
        DS18B20_DQ_OUT;
        DS18B20_DQ_HIGH;
        _delay_us(60);
    }

    return _data;
}

float DS18B20_ReadTemperature(void)
{
    unsigned char temp = 0;
    float t = 0;

    DS18B20_Init();
    DS18B20_WriteByte(0xcc);
    DS18B20_WriteByte(0x44);

    DS18B20_Init();
    DS18B20_WriteByte(0xcc);
    DS18B20_WriteByte(0xbe);

    temp = DS18B20_ReadByte();
    t = (((temp & 0xf0) >> 4) + (temp & 0x07) * 0.125);
    temp = DS18B20_ReadByte();
    t += ((temp & 0x0f) << 4);

    return t;
}

int main(void)
{
    CLK_SWCR_SWEN = 1;
    CLK_SWR = 0xB4;    //HSE selected as master clock source

    UART_Init();
    printf("********* STM8S-Discovery DS18B20 Test *********\r\n");
    printf("Build: %s %s\r\n", __DATE__, __TIME__);

    asm("rim");

    while(1)
    {
        _delay_ms(1000);
        printf("%.3f ", DS18B20_ReadTemperature());
    }
}

#pragma vector = UART2_R_RXNE_vector
__interrupt void UART2_IRQHandler(void)
{
    if (UART2_SR_RXNE == 1)
    {
        UART_TxByte(UART2_DR);
    }
}

Keywords：STM8S Discovery DS18B20 Reference address：STM8S-Discovery third program - DS18B20

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Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->/******** STM8S-Discovery DS18B20 Test ******** * Version.........: 1.0 * Target.........: STM8S105C6T6 * File name.......: main.c * Development environment.....: IAR for STM8 V1.1 ********************************

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