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/**
* @author Tilen Majerle
* @email tilen@majerle.eu
* @website http://stm32f4-discovery.com
* @link http://stm32f4-discovery.com/2014/05/library-12-onewire-library-for-stm43f4xx/
* @version v2.1
* @ide Keil uVision
* @license GNU GPL v3
* @brief Onewire library for STM32F4 devices
*
@verbatim
----------------------------------------------------------------------
Copyright (C) Tilen Majerle, 2015
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
----------------------------------------------------------------------
@endverbatim
*/
#ifndef TM_ONEWIRE_H
#define TM_ONEWIRE_H 210
/* C++ detection */
#ifdef __cplusplus
extern C {
#endif
/**
* @addtogroup TM_STM32F4xx_Libraries
* @{
*/
/**
* @defgroup TM_ONEWIRE
* @brief Onewire library for STM32F4 devices - http://stm32f4-discovery.com/2014/05/library-12-onewire-library-for-stm43f4xx/
* @{
*
* As of version 2.0 you can now use more than just one one-wire "port" on STM32F4. This allows you to group devices to separate ports.
*
* Because if you have a loot devices on one port, if one device fail, everything is failed. You can prevent this by use more than just one port.
*
* To set your port and pin for OneWire protocol, you can do this when calling @ref TM_OneWire_Init function.
*
* \par Changelog
*
@verbatim
Version 2.1
- March 10, 2015
- Added support for new GPIO library
Version 2.0
- January 04, 2015
- New OneWire system
- With support for multiple OneWire ports to separate group of devices
Version 1.1
- December 06, 2014
- Added 8-bit CRC calculation for 1-Wire devices, algorithm from Dallas
Version 1.0
- First release
@endverbatim
*
* \par Dependencies
*
@verbatim
- STM32F4xx
- STM32F4xx RCC
- STM32F4xx GPIO
- TM GPIO
@endverbatim
*/
#include "stm32f4xx.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
/**
* @defgroup TM_ONEWIRE_Macros
* @brief Library defines
* @{
*/
/* Pin settings */
#define ONEWIRE_LOW(structure) GPIO_ResetBits((structure)->GPIOx, (structure)->GPIO_Pin)
#define ONEWIRE_HIGH(structure) GPIO_SetBits((structure)->GPIOx, (structure)->GPIO_Pin)
#define ONEWIRE_INPUT(structure) TM_GPIO_SetPinAsInput(structure->GPIOx, (structure)->GPIO_Pin)
#define ONEWIRE_OUTPUT(structure) TM_GPIO_SetPinAsOutput(structure->GPIOx, (structure)->GPIO_Pin)
/* 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
/**
* @}
*/
/**
* @defgroup TM_ONEWIRE_Typedefs
* @brief Library Typedefs
* @{
*/
/**
* @brief OneWire working struct
* @note Except ROM_NO member, everything is fully private and should not be touched by user
*/
typedef struct {
GPIO_TypeDef* GPIOx; /*!< GPIOx port to be used for I/O functions */
uint16_t GPIO_Pin; /*!< GPIO Pin to be used for I/O functions */
uint8_t LastDiscrepancy; /*!< Search private */
uint8_t LastFamilyDiscrepancy; /*!< Search private */
uint8_t LastDeviceFlag; /*!< Search private */
uint8_t ROM_NO[8]; /*!< 8-bytes address of last search device */
} TM_OneWire_t;
/**
* @}
*/
/**
* @defgroup TM_ONEWIRE_Functions
* @brief Library Functions
* @{
*/
/**
* @brief Initializes OneWire bus
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t empty working onewire structure
* @param *Pointer to GPIO port used for onewire channel
* @param GPIO_Pin: GPIO Pin on specific GPIOx to be used for onewire channel
* @retval None
*/
void TM_OneWire_Init(TM_OneWire_t* OneWireStruct, GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin);
/**
* @brief Resets OneWire bus
*
* @note Sends reset command for OneWire
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire structure
* @retval None
*/
uint8_t TM_OneWire_Reset(TM_OneWire_t* OneWireStruct);
/**
* @brief Reads byte from one wire bus
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire structure
* @retval Byte from read operation
*/
uint8_t TM_OneWire_ReadByte(TM_OneWire_t* OneWireStruct);
/**
* @brief Writes byte to bus
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire structure
* @param byte: 8-bit value to write over OneWire protocol
* @retval None
*/
void TM_OneWire_WriteByte(TM_OneWire_t* OneWireStruct, uint8_t byte);
/**
* @brief Writes single bit to onewire bus
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire structure
* @param bit: Bit value to send, 1 or 0
* @retval None
*/
void TM_OneWire_WriteBit(TM_OneWire_t* OneWireStruct, uint8_t bit);
/**
* @brief Reads single bit from one wire bus
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire structure
* @retval Bit value:
* - 0: Bit is low (zero)
* - > 0: Bit is high (one)
*/
uint8_t TM_OneWire_ReadBit(TM_OneWire_t* OneWireStruct);
/**
* @brief Searches for OneWire devices on specific Onewire port
* @note Not meant for public use. Use @ref TM_OneWire_First and @ref TM_OneWire_Next for this.
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire structure where to search
* @param Device status:
* - 0: No devices detected
* - > 0: Device detected
*/
uint8_t TM_OneWire_Search(TM_OneWire_t* OneWireStruct, uint8_t command);
/**
* @brief Resets search states
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire where to reset search values
* @retval None
*/
void TM_OneWire_ResetSearch(TM_OneWire_t* OneWireStruct);
/**
* @brief Starts search, reset states first
* @note When you want to search for ALL devices on one onewire port, you should first use this function.
@verbatim
/...Initialization before
status = TM_OneWire_First(&OneWireStruct);
while (status) {
//Save ROM number from device
TM_OneWire_GetFullROM(ROM_Array_Pointer);
//Check for new device
status = TM_OneWire_Next(&OneWireStruct);
}
@endverbatim
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire where to reset search values
* @param Device status:
* - 0: No devices detected
* - > 0: Device detected
*/
uint8_t TM_OneWire_First(TM_OneWire_t* OneWireStruct);
/**
* @brief Reads next device
* @note Use @ref TM_OneWire_First to start searching
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire
* @param Device status:
* - 0: No devices detected any more
* - > 0: New device detected
*/
uint8_t TM_OneWire_Next(TM_OneWire_t* OneWireStruct);
/**
* @brief Gets ROM number from device from search
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire
* @param index: Because each device has 8-bytes long ROm address, you have to call this 8 times, to get ROM bytes from 0 to 7
* @reetval ROM byte for index (0 to 7) at current found device
*/
uint8_t TM_OneWire_GetROM(TM_OneWire_t* OneWireStruct, uint8_t index);
/**
* @brief Gets all 8 bytes ROM value from device from search
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire
* @param *firstIndex: Pointer to first location for first byte, other bytes are automatically incremented
* @retval None
*/
void TM_OneWire_GetFullROM(TM_OneWire_t* OneWireStruct, uint8_t *firstIndex);
/**
* @brief Selects specific slave on bus
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire
* @param *addr: Pointer to first location of 8-bytes long ROM address
* @retval None
*/
void TM_OneWire_Select(TM_OneWire_t* OneWireStruct, uint8_t* addr);
/**
* @brief Selects specific slave on bus with pointer address
* @param *OneWireStruct: Pointer to @ref TM_OneWire_t working onewire
* @param *ROM: Pointer to first byte of ROM address
* @retval None
*/
void TM_OneWire_SelectWithPointer(TM_OneWire_t* OneWireStruct, uint8_t* ROM);
/**
* @brief Calculates 8-bit CRC for 1-wire devices
* @param *addr: Pointer to 8-bit array of data to calculate CRC
* @param len: Number of bytes to check
*
* @retval Calculated CRC from input data
*/
uint8_t TM_OneWire_CRC8(uint8_t* addr, uint8_t len);
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/* C++ detection */
#ifdef __cplusplus
}
#endif
#endif
|
