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| | | Implementation of command callback |
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| | | ------------- |
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| | | Command callback is defined as function with result of type scpi_result_t and one parameter - scpi context |
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| | | scpi_result_t DMM_MeasureVoltageDcQ(scpi_t * context) |
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| | | Command callback should return SCPI_RES_OK if everything goes well. |
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| | | You can read command parameters and write command results. There are several functions to do this. |
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| | | Every time, you call function to read parameter, it shifts pointers to the next parameter. You can't read specified parameter directly by its index - e.g. |
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| | | // pseudocode |
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| | | param3 = read_param(3); // this is not possible |
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| | | read_param(); // discard first parameter |
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| | | read_param(); // discard second parameter |
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| | | param3 = read_param(); // read third parameter |
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| | | If you discard some parameters, there is no way to recover them. |
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| | | These are the functions, you can use to read parameters |
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| | | - SCPI_ParamInt - read signed 32bit integer value (dec or hex with 0x prefix) |
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| | | - SCPI_ParamDouble - read double value |
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| | | - SCPI_ParamNumber - read double value with or without units or represented by special number (DEF, MIN, MAX, ...). This function is more universal then SCPI_ParamDouble. |
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| | | - SCPI_ParamText - read text value - may be encapsuled in "" |
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| | | - SCPI_ParamString - read unspecified parameter not encapsulated in "" |
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| | | These are the functions, you can use to write results |
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| | | - SCPI_ResultInt - write integer value |
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| | | - SCPI_ResultDouble - write double value |
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| | | - SCPI_ResultText - write text value encapsulated in "" |
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| | | - SCPI_ResultString - directly write string value |
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| | | You can use function SCPI_NumberToStr to convert number with units to textual representation and then use SCPI_ResultString to write this to the user. |
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