From ee12be8250ef185d24281f35fbd8541de240ece1 Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周二, 13 10月 2015 01:08:52 +0800
Subject: [PATCH] Resolve #55: SCPI_ExprChannelListEntry example
---
examples/common/scpi-def.c | 143 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 143 insertions(+), 0 deletions(-)
diff --git a/examples/common/scpi-def.c b/examples/common/scpi-def.c
index 64c9d45..dde9217 100644
--- a/examples/common/scpi-def.c
+++ b/examples/common/scpi-def.c
@@ -188,6 +188,148 @@
return SCPI_RES_OK;
}
+struct _scpi_channel_value_t {
+ int32_t row;
+ int32_t col;
+};
+typedef struct _scpi_channel_value_t scpi_channel_value_t;
+
+/**
+ * @brief
+ * parses lists
+ * channel numbers > 0.
+ * no checks yet.
+ * valid: (@1), (@3!1:1!3), ...
+ * (@1!1:3!2) would be 1!1, 1!2, 2!1, 2!2, 3!1, 3!2.
+ * (@3!1:1!3) would be 3!1, 3!2, 3!3, 2!1, 2!2, 2!3, ... 1!3.
+ *
+ * @param channel_list channel list, compare to SCPI99 Vol 1 Ch. 8.3.2
+ */
+static scpi_result_t TEST_Chanlst(scpi_t *context) {
+ scpi_parameter_t channel_list_param;
+#define maxrow 2 //maximum number of rows
+#define maxcol 6 //maximum number of columns
+#define maxdim 2 //maximum number of dimensions
+ scpi_channel_value_t array[maxrow * maxcol]; //array which holds values in order (2D)
+ size_t chanlst_idx; //index for channel list
+ size_t arr_idx = 0; //index for array
+ size_t n, m = 1; //counters for row (n) and columns (m)
+
+ // get channel list
+ if (SCPI_Parameter(context, &channel_list_param, TRUE)) {
+ scpi_expr_result_t res;
+ scpi_bool_t is_range;
+ int32_t values_from[maxdim];
+ int32_t values_to[maxdim];
+ size_t dimensions;
+
+ bool for_stop_row = false; //true if iteration for rows has to stop
+ bool for_stop_col = false; //true if iteration for columns has to stop
+ int32_t dir_row = 1; //direction of counter for rows, +/-1
+ int32_t dir_col = 1; //direction of counter for columns, +/-1
+
+ // the next statement is valid usage and it gets only real number of dimensions for the first item (index 0)
+ if (!SCPI_ExprChannelListEntry(context, &channel_list_param, 0, &is_range, NULL, NULL, 0, &dimensions)) {
+ chanlst_idx = 0; //call first index
+ arr_idx = 0; //set arr_idx to 0
+ do { //if valid, iterate over channel_list_param index while res == valid (do-while cause we have to do it once)
+ res = SCPI_ExprChannelListEntry(context, &channel_list_param, chanlst_idx, &is_range, values_from, values_to, 4, &dimensions);
+ if (is_range == false) { //still can have multiple dimensions
+ if (dimensions == 1) {
+ //here we have our values
+ //row == values_from[0]
+ //col == 0 (fixed number)
+ //call a function or something
+ array[arr_idx].row = values_from[0];
+ array[arr_idx].col = 0;
+ } else if (dimensions == 2) {
+ //here we have our values
+ //row == values_fom[0]
+ //col == values_from[1]
+ //call a function or something
+ array[arr_idx].row = values_from[0];
+ array[arr_idx].col = values_from[1];
+ } else {
+ return SCPI_RES_ERR;
+ break;
+ }
+ arr_idx++; //inkrement array where we want to save our values to, not neccessary otherwise
+ } else if (is_range == true) {
+ if (values_from[0] > values_to[0]) {
+ dir_row = -1; //we have to decrement from values_from
+ } else { //if (values_from[0] < values_to[0])
+ dir_row = +1; //default, we increment from values_from
+ }
+
+ //iterating over rows, do it once -> set for_stop_row = false
+ //needed if there is channel list index isn't at end yet
+ for_stop_row = false;
+ for (n = values_from[0]; for_stop_row == false; n += dir_row) {
+ //usual case for ranges, 2 dimensions
+ if (dimensions == 2) {
+ if (values_from[1] > values_to[1]) {
+ dir_col = -1;
+ } else if (values_from[1] < values_to[1]) {
+ dir_col = +1;
+ }
+ //iterating over columns, do it at least once -> set for_stop_col = false
+ //needed if there is channel list index isn't at end yet
+ for_stop_col = false;
+ for (m = values_from[1]; for_stop_col == false; m += dir_col) {
+ //here we have our values
+ //row == n
+ //col == m
+ //call a function or something
+ array[arr_idx].row = n;
+ array[arr_idx].col = m;
+ arr_idx++;
+ if (m == (size_t)values_to[1]) {
+ //endpoint reached, stop column for-loop
+ for_stop_col = true;
+ }
+ }
+ //special case for range, example: (@2!1)
+ } else if (dimensions == 1) {
+ //here we have values
+ //row == n
+ //col == 0 (fixed number)
+ //call function or sth.
+ array[arr_idx].row = n;
+ array[arr_idx].col = 0;
+ arr_idx++;
+ }
+ if (n == (size_t)values_to[0]) {
+ //endpoint reached, stop row for-loop
+ for_stop_row = true;
+ }
+ }
+
+
+ } else {
+ return SCPI_RES_ERR;
+ break;
+ }
+ //increase index
+ chanlst_idx++;
+ } while (SCPI_EXPR_OK == SCPI_ExprChannelListEntry(context, &channel_list_param, chanlst_idx, &is_range, values_from, values_to, 4, &dimensions));
+ //while checks, whether incremented index is valid
+ }
+ //do something at the end if needed
+ array[arr_idx].row = 0;
+ array[arr_idx].col = 0;
+ }
+
+ {
+ size_t i;
+ fprintf(stderr, "TEST_Chanlst: ");
+ for (i = 0; i< arr_idx; i++) {
+ fprintf(stderr, "%d!%d, ", array[i].row, array[i].col);
+ }
+ fprintf(stderr, "\r\n");
+ }
+ return SCPI_RES_OK;
+}
+
/**
* Reimplement IEEE488.2 *TST?
*
@@ -256,6 +398,7 @@
{.pattern = "TEST#:NUMbers#", .callback = TEST_Numbers,},
{.pattern = "TEST:TEXT", .callback = TEST_Text,},
{.pattern = "TEST:ARBitrary?", .callback = TEST_ArbQ,},
+ {.pattern = "TEST:CHANnellist", .callback = TEST_Chanlst,},
SCPI_CMD_LIST_END
};
--
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