CALIBRE
4.4.9.restart
Function specification | Int restart(int slaveaddress, int setnack) | |
Parameters are: | int slaveaddress | |
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| The address to be accessed via the I2C, e.g. A1H. |
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| int setnack |
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| This controls whether the Parallel I2C Communications Adapter transmits an |
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| Acknowledge down the I2C Bus on reception of a byte. The last byte received |
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| during a transfer must not be acknowledged, in all other cases acknowledge |
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| must be enabled. If setnack = 0 then acknowledge is enabled, if setnack = 1 |
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| then acknowledge is disabled. Therefore, if a read (odd numbered) address is |
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| being sent AND only 1 Byte is to be read, setnack should be set to = 1; in all |
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| other cases it must be clear = 0. |
Parameters returned | int ErrCode | |
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| If the transfer time out occurs error code 8003H is returned otherwise the |
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| status is returned. |
Prerequisites | Adapter must be configured using setup. A start and slave address must | |
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| have previously been sent using sendaddress. |
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| Usually a data pointer would already have been written using writebyte. |
Functional description | Sends a start code and the slave address specified and presets the | |
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| acknowledge status depending on the value of setnack. |
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| The acknowledge is set ready for the data transfer after the address and |
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| hence in read mode (odd address being sent) if only one byte is to be read |
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| the setnack parameter must equal 1. If more than one byte is to be read or if |
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| in write mode (even address being sent) then setnack must equal 0. |
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| The function waits for the address to be sent. Should a |
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| the sending of an address then an error code 8003H is returned, otherwise |
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| the status is returned. |
4.4.10. | getstatus |
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Function specification: | Int getstatus(void) | |
Parameters are: | None. | |
Parameters returned | int I2Cstatus | |
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| The current value of the bus status. |
Prerequisites | Adapter must be configured using setup. | |
Functional description | The function reads status word from the adapter and returns it. | |
4.4.11. | recover |
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Function specification | Int recover(void) | |
Parameters are: | None. | |
Parameters returned | int ErrCode. | |
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| If the bus recovery failed error code 8006H is returned otherwise the status is |
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| returned. |
Prerequisites | Adapter must be configured using setup. | |
Issue 1.3 |
| Page 23 |
22/07/99
