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多维数组的初始化
同事写了一个三维数组初始化的code， 其大体如下
typedef struct
6 {
7 uint8_t n;
8 uint8_t m;
9 }mipi_clk_ratio;
10
11 static mipi_clk_ratio mipi_clk[2][2][4] =
12 {
13 //CSI
14 {{8,1}, {4,1},{8,3},{2,1}}, //YUV422
15 {{12,1}, {6,1},{4,1},{3,1}}, //RGB888
16 //DSI
17 {{8,1}, {4,1},{8,3},{2,1}}, //YUV422
18 {{12,1}, {6,1},{4,1},{3,1}}, //RGB888
19 };
在keil下编译运行都没有问题，但是在gcc编译就出现下面的warnings
test1.c:14:2: warning: excess elements in array initializer [enabled by default] test1.c:14:2: warning: (near initialization for ‘mipi_clk[0]’) [enabled by default] test1.c:14:2: warning: excess elements in array initializer [enabled by default] test1.c:14:2: warning: (near initialization for ‘mipi_clk[0]’) [enabled by default] test1.c:15:2: warning: excess elements in array initializer [enabled by default] test1.c:15:2: warning: (near initialization for ‘mipi_clk[1]’) [enabled by default] test1.c:15:2: warning: excess elements in array initializer [enabled by default] test1.c:15:2: warning: (near initialization for ‘mipi_clk[1]’) [enabled by default] test1.c:17:2: warning: excess elements in array initializer [enabled by default] test1.c:17:2: warning: (near initialization for ‘mipi_clk[2]’) [enabled by default] test1.c:17:2: warning: excess elements in array initializer [enabled by default] test1.c:17:2: warning: (near initialization for ‘mipi_clk[2]’) [enabled by default] test1.c:17:2: warning: excess elements in array initializer [enabled by default] test1.c:17:2: warning: (near initialization for ‘mipi_clk’) [enabled by default] test1.c:18:2: warning: excess elements in array initializer [enabled by default] test1.c:18:2: warning: (near initialization for ‘mipi_clk[2]’) [enabled by default] test1.c:18:2: warning: excess elements in array initializer [enabled by default] test1.c:18:2: warning: (near initialization for ‘mipi_clk[2]’) [enabled by default] test1.c:18:2: warning: excess elements in array initializer [enabled by default] test1.c:18:2: warning: (near initialization for ‘mipi_clk’) [enabled by default]
仔细分析，应该是gcc编译器不能从初始化的数组数据中分清维数，有歧义。可以添加{}来更清晰定义它，如下所示
typedef struct
6 {
7 uint8_t n;
8 uint8_t m;
9 }mipi_clk_ratio;
10
11 static mipi_clk_ratio mipi_clk[2][2][4] =
12 {
13 //CSI
14 <strong><em><span style="color:#ff0000;">{</span></em></strong>{{8,1}, {4,1},{8,3},{2,1}}, //YUV422
15 {{12,1}, {6,1},{4,1},{3,1}}<strong><em><span style="color:#ff0000;">}</span></em></strong>, //RGB888
16 // //DSI
17 <strong><em><span style="color:#ff0000;">{</span></em></strong>{{8,1}, {4,1},{8,3},{2,1}}, //YUV422
18 {{12,1}, {6,1},{4,1},{3,1}}<strong><span style="color:#ff0000;"><em>}</em></span></strong> //RGB888
19 };总结一下，有的编译器对多维数组初始化是按行来进行的，所以要求开发者对初始化数据通过添加{}来清晰定义。 此外，为了代码更好的可读性，最好不要定义三维及以上的数组。
多维数组的初始化
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