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feat: add ds18b20 demo

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This commit is contained in:
IOsetting 2022-06-04 14:57:34 +08:00
parent 6a2255a19d
commit aa65f9556f
3 changed files with 340 additions and 0 deletions
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168
demo/gpio/ds18b20/ds18b20.c Normal file
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// Copyright 2021 IOsetting <iosetting(at)outlook.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "ds18b20.h"
void DS18B20_Init(void)
{
DS18B20_DQ_PULLUP();
DS18B20_DQ_OUTPUT();
DS18B20_DQ = SET;
SYS_DelayUs(1000);
DS18B20_DQ = RESET;
SYS_DelayUs(1000);
DS18B20_DQ = SET;
SYS_DelayUs(2000);
}
__BIT DS18B20_Reset(void)
{
__BIT b;
/* Line low, and wait 480us */
DS18B20_DQ = RESET;
DS18B20_DQ_OUTPUT();
SYS_DelayUs(500);
/* Release line and wait for 70us */
DS18B20_DQ_INPUT();
SYS_DelayUs(70);
/* Check bit value, success if low */
b = DS18B20_DQ;
/* Delay for 410 us */
SYS_DelayUs(410);
/* Return value of presence pulse, 0 = OK, 1 = ERROR */
return b;
}
__BIT DS18B20_ReadBit(void)
{
__BIT b = RESET;
/* Line low */
DS18B20_DQ = RESET;
DS18B20_DQ_OUTPUT();
SYS_DelayUs(2);
/* Release line */
DS18B20_DQ_INPUT();
SYS_DelayUs(10);
/* Read line value */
if (DS18B20_DQ) {
/* Bit is HIGH */
b = SET;
}
/* Wait 50us to complete 60us period */
SYS_DelayUs(50);
/* Return bit value */
return b;
}
uint8_t DS18B20_ReadByte(void)
{
uint8_t i = 8, byte = 0;
while (i--)
{
byte >>= 1;
byte |= (DS18B20_ReadBit() << 7);
}
return byte;
}
void DS18B20_WriteBit(__BIT b)
{
if (b)
{
/* Set line low */
DS18B20_DQ = RESET;
DS18B20_DQ_OUTPUT();
SYS_DelayUs(10);
/* Bit high */
DS18B20_DQ_INPUT();
/* Wait for 55 us and release the line */
SYS_DelayUs(55);
DS18B20_DQ_INPUT();
}
else
{
/* Set line low */
DS18B20_DQ = RESET;
DS18B20_DQ_OUTPUT();
SYS_DelayUs(65);
/* Bit high */
DS18B20_DQ_INPUT();
/* Wait for 5 us and release the line */
SYS_DelayUs(5);
DS18B20_DQ_INPUT();
}
}
void DS18B20_WriteByte(uint8_t byte)
{
uint8_t i = 8;
/* Write 8 bits */
while (i--)
{
/* LSB bit is first */
DS18B20_WriteBit(byte & 0x01);
byte >>= 1;
}
}
void DS18B20_StartAll(void)
{
/* Reset pulse */
DS18B20_Reset();
/* Skip rom */
DS18B20_WriteByte(ONEWIRE_CMD_SKIPROM);
/* Start conversion on all connected devices */
DS18B20_WriteByte(DS18B20_CMD_CONVERTTEMP);
}
__BIT DS18B20_AllDone(void)
{
/* If read bit is low, then device is not finished yet with calculation temperature */
return DS18B20_ReadBit();
}
uint16_t DS18B20_ReadTemperature(void)
{
uint16_t temperature;
uint8_t i = 0;
uint8_t data[9];
/* Reset line */
DS18B20_Reset();
/* Skip ROM */
DS18B20_WriteByte(ONEWIRE_CMD_SKIPROM);
/* Read scratchpad command by onewire protocol */
DS18B20_WriteByte(ONEWIRE_CMD_RSCRATCHPAD);
/* Get data */
for (i = 0; i < 9; i++)
{
/* Read byte by byte */
data[i] = DS18B20_ReadByte();
}
temperature = data[1];
temperature = temperature << 8 | data[0];
return temperature;
}

120
demo/gpio/ds18b20/ds18b20.h Normal file
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// Copyright 2021 IOsetting <iosetting(at)outlook.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __FW_DS18B20__
#define __FW_DS18B20__
#include "fw_hal.h"
/**
* DS18B20 - Programmable Resolution 1-Wire Digital Thermometer
*
* To-92 Pins:
* With the flat side facing you and with the leads pointing down, they are GND, DQ and Vdd
*
*/
#define DS18B20_DQ P35
#define DS18B20_DQ_PULLUP() GPIO_SetPullUp(GPIO_Port_3, GPIO_Pin_5, HAL_State_ON)
#define DS18B20_DQ_INPUT() GPIO_P3_SetMode(GPIO_Pin_5, GPIO_Mode_Input_HIP)
#define DS18B20_DQ_OUTPUT() GPIO_P3_SetMode(GPIO_Pin_5, GPIO_Mode_InOut_OD)
#define DS18B20_DQ_LOW() DS18B20_DQ=RESET
#define DS18B20_DQ_HIGH() DS18B20_DQ=SET
/* OneWire commands */
#define ONEWIRE_CMD_RSCRATCHPAD 0xBE
#define ONEWIRE_CMD_WSCRATCHPAD 0x4E
#define ONEWIRE_CMD_CPYSCRATCHPAD 0x48
#define ONEWIRE_CMD_RECEEPROM 0xB8
#define ONEWIRE_CMD_RPWRSUPPLY 0xB4
#define ONEWIRE_CMD_SEARCHROM 0xF0
#define ONEWIRE_CMD_READROM 0x33
#define ONEWIRE_CMD_MATCHROM 0x55
#define ONEWIRE_CMD_SKIPROM 0xCC
#define DS18B20_FAMILY_CODE 0x28
#define DS18B20_CMD_ALARMSEARCH 0xEC
/* DS18B20 read temperature command */
#define DS18B20_CMD_CONVERTTEMP 0x44 /* Convert temperature */
#define DS18B20_DECIMAL_STEPS_12BIT 0.0625
#define DS18B20_DECIMAL_STEPS_11BIT 0.125
#define DS18B20_DECIMAL_STEPS_10BIT 0.25
#define DS18B20_DECIMAL_STEPS_9BIT 0.5
/* Bits locations for resolution */
#define DS18B20_RESOLUTION_R1 6
#define DS18B20_RESOLUTION_R0 5
typedef enum {
DS18B20_Resolution_9bits = 9, /*!< DS18B20 9 bits resolution */
DS18B20_Resolution_10bits = 10, /*!< DS18B20 10 bits resolution */
DS18B20_Resolution_11bits = 11, /*!< DS18B20 11 bits resolution */
DS18B20_Resolution_12bits = 12 /*!< DS18B20 12 bits resolution */
} DS18B20_Resolution_t;
/**
* @brief Initialize DS18B20
*/
void DS18B20_Init(void);
/**
* @brief Reset DS18B20
* @return bit value
*/
__BIT DS18B20_Reset(void);
/**
* @brief Read one bit from DS18B20
* @return bit value
*/
__BIT DS18B20_ReadBit(void);
/**
* @brief Read one byte from DS18B20
* @return byte value
*/
uint8_t DS18B20_ReadByte(void);
/**
* @brief Write one bit to DS18B20
* @param b bit value
*/
void DS18B20_WriteBit(__BIT b);
/**
* @brief Write one byte to DS18B20
* @param byte byte value
*/
void DS18B20_WriteByte(uint8_t byte);
/**
* @brief Start all DS18B20
*/
void DS18B20_StartAll(void);
/**
* @brief If read bit is low, then device is not finished yet with calculation temperature
* @return bit value
*/
__BIT DS18B20_AllDone(void);
/**
* @brief Read 16 bits temperature
* @return temperature value
*/
uint16_t DS18B20_ReadTemperature(void);
#endif // __DS18B20_H_

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demo/gpio/ds18b20/ds18b20_stc8h3k.c Normal file
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// Copyright 2021 IOsetting <iosetting(at)outlook.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/***
* Demo: DS18B20
* Board: STC8H3K32
*
* P35 -> DQ
* GND -> GND
* 3.3V -> VCC
*/
#include "fw_hal.h"
#include "ds18b20.h"
uint16_t temp;
int main(void)
{
uint16_t temperature;
SYS_SetClock();
// UART1, baud 115200, baud source Timer1, 1T mode, no interrupt
UART1_Config8bitUart(UART1_BaudSource_Timer1, HAL_State_ON, 115200);
DS18B20_Init();
while(1)
{
DS18B20_StartAll();
while (!DS18B20_AllDone())
{
UART1_TxChar('.');
SYS_Delay(1);
}
temperature = DS18B20_ReadTemperature();
UART1_TxHex(temperature >> 8);
UART1_TxHex(temperature & 0xFF);
UART1_TxString("\r\n");
SYS_Delay(1000);
}
}