62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
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#ifndef LINUX_I2C_I2COMIF_H_
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#define LINUX_I2C_I2COMIF_H_
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#include "I2cCookie.h"
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#include <fsfw/objectmanager/SystemObject.h>
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#include <fsfw/devicehandlers/DeviceCommunicationIF.h>
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#include <unordered_map>
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#include <vector>
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/**
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* @brief This is the communication interface for I2C devices connected
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* to a system running a Linux OS.
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*
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* @note The Xilinx Linux kernel might not support to read more than 255 bytes at once.
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*
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* @author J. Meier
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*/
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class I2cComIF: public DeviceCommunicationIF, public SystemObject {
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public:
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I2cComIF(object_id_t objectId);
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virtual ~I2cComIF();
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ReturnValue_t initializeInterface(CookieIF * cookie) override;
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ReturnValue_t sendMessage(CookieIF *cookie,const uint8_t *sendData,
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size_t sendLen) override;
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ReturnValue_t getSendSuccess(CookieIF *cookie) override;
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ReturnValue_t requestReceiveMessage(CookieIF *cookie,
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size_t requestLen) override;
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ReturnValue_t readReceivedMessage(CookieIF *cookie, uint8_t **buffer,
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size_t *size) override;
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private:
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struct I2cInstance {
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std::vector<uint8_t> replyBuffer;
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size_t replyLen;
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};
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using I2cDeviceMap = std::unordered_map<address_t, I2cInstance>;
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using I2cDeviceMapIter = I2cDeviceMap::iterator;
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/* In this map all i2c devices will be registered with their address and
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* the appropriate file descriptor will be stored */
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I2cDeviceMap i2cDeviceMap;
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I2cDeviceMapIter i2cDeviceMapIter;
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/**
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* @brief This function opens an I2C device and binds the opened file
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* to a specific I2C address.
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* @param deviceFile The name of the device file. E.g. i2c-0
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* @param i2cAddress The address of the i2c slave device.
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* @param fileDescriptor Pointer to device descriptor.
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* @return RETURN_OK if successful, otherwise RETURN_FAILED.
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*/
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ReturnValue_t openDevice(std::string deviceFile,
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address_t i2cAddress, int* fileDescriptor);
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};
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#endif /* LINUX_I2C_I2COMIF_H_ */
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