[问答]

Cosmic CXSTM8 Comiler Error无效的常量表达式

问答对人有帮助，内容完整，我也想知道答案 0 我正在将一些设计为在Nordic nRF8200上运行的代码移植到STM8L152C6。代码是使用Keil C5编写的。我正在使用Cosmic CXSTM8编译器。我在CASE中遇到编译器错误'Invalid Constant Expression'：我无法理解的switch语句行。代码段包含在下面。开关（pipe_num） { 案例PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX： alert_handle_on_link_loss =（alert_level_t）buffer [0]; 打破; 默认：打破; } pipe_num是本地定义的uint8_t，和 #define PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX 6在包含的头文件中声明。在这种情况下，我无法理解编译器正在处理异常。如果有人可以提供帮助，我会非常感激。以上来自于谷歌翻译以下为原文 I'm porting some code designed to run on a Nordic nRF8200 to an STM8L152C6. The code was orginally compiled using Keil C5. I am using the Cosmic CXSTM8 compiler. I am getting a compiler error 'Invalid Constant Expression' in the CASE: line of a switch statement that I cannot understand. code snippet is included below. switch (pipe_num) { case PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX: alert_handle_on_link_loss = (alert_level_t)buffer[0]; break; default: break; } pipe_num is a locally defined uint8_t, and #define PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX 6 is declared in an included header file. I cannot understand what the compiler is taking exception to in this case. If anyone could help I'd really appreciate it. 0
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答案对人有帮助，有参考价值 0 ''我在CASE中遇到编译错误'无效常量表达式'：我无法理解的switch语句行'' 首先，在此之前是否还有其他错误或警告？如果是这样，你的意思是这一行：案例PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX：唯一的常量表达式是PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX - 因此请重新检查该定义。例如，您是否确定它不受某些条件编译选项的影响，而这些选项在项目中没有（正确）设置...？ Howver， alert_handle_on_link_loss =（alert_level_t）buffer [0]; 也是一个不变的表达 - 你确定它不抱怨吗？ “在这种情况下，我无法理解编译器正在处理异常的问题” 您是否尝试过查看预处理器输出？请参阅：http：//www.8052.com/forum/read/29152 这不是8052特定的 - 确保你没有犯过那里提到的错误！以上来自于谷歌翻译以下为原文 ''I am getting a compiler error 'Invalid Constant Expression' in the CASE: line of a switch statement that I cannot understand'' First, are there any other errors or warnings before this? If so, You mean this line: case PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX: The only constant expression there is PIPE_LINK_LOSS_ALERT_ALERT_LEVEL_RX - so re-check that definition. Are you sure it isn't, for example, affected by some conditional compilation options that you've not (properly) set-up in your project...? Howver, alert_handle_on_link_loss = (alert_level_t)buffer[0]; is also a constant expression - are you sure it's not complaining about that? ''I cannot understand what the compiler is taking exception to in this case'' Have you tried looking at the preprocessor output? See: http://www.8052.com/forum/read/29152 It's not 8052-specific - and do make sure that you haven't made the very mistake mentioned there!

2019-1-23 16:44:32 评论举报张建军