Let firmware info be optional to save RAM

Many projects already have another mechanism for getting firmware info
or want to save RAM and do not need firmware info of CmBacktrace. With
this change user can pass NULL for name and version after setting the
define CMB_NOT_USING_FIRMWARE_INFO.

cm_backtrace/cm_backtrace.c

@@ -119,9 +119,14 @@ static const char * const print_info[] = {
 #endif
 };
 
-static char fw_name[CMB_NAME_MAX + 1] = {0};
-static char hw_ver[CMB_NAME_MAX + 1] = {0};
-static char sw_ver[CMB_NAME_MAX + 1] = {0};
+#ifdef CMB_NOT_USING_FIRMWARE_INFO
+    static const char * const fw_name = "x";
+#else
+    static char fw_name[CMB_NAME_MAX + 1] = {0};
+    static char hw_ver[CMB_NAME_MAX + 1] = {0};
+    static char sw_ver[CMB_NAME_MAX + 1] = {0};
+#endif
+
 static uint32_t main_stack_start_addr = 0;
 static size_t main_stack_size = 0;
 static uint32_t code_start_addr = 0;
@@ -143,9 +148,11 @@ static bool on_thread_before_fault = false;
  * library initialize
  */
 void cm_backtrace_init(const char *firmware_name, const char *hardware_ver, const char *software_ver) {
+#ifndef CMB_NOT_USING_FIRMWARE_INFO
     strncpy(fw_name, firmware_name, CMB_NAME_MAX);
     strncpy(hw_ver, hardware_ver, CMB_NAME_MAX);
     strncpy(sw_ver, software_ver, CMB_NAME_MAX);
+#endif
 
 #if defined(__ARMCC_VERSION)
     main_stack_start_addr = (uint32_t)&CSTACK_BLOCK_START(CMB_CSTACK_BLOCK_NAME);
@@ -174,12 +181,14 @@ void cm_backtrace_init(const char *firmware_name, const char *hardware_ver, cons
     init_ok = true;
 }
 
+#ifndef CMB_NOT_USING_FIRMWARE_INFO
 /**
  * print firmware information, such as: firmware name, hardware version, software version
  */
 void cm_backtrace_firmware_info(void) {
     cmb_println(print_info[PRINT_FIRMWARE_INFO], fw_name, hw_ver, sw_ver);
 }
+#endif /* CMB_NOT_USING_FIRMWARE_INFO */
 
 #ifdef CMB_USING_OS_PLATFORM
 /**

cm_backtrace/cmb_cfg.h

@@ -46,6 +46,8 @@
 /* #define CMB_USING_DUMP_STACK_INFO */
 /* language of print information */
 /* #define CMB_PRINT_LANGUAGE             CMB_PRINT_LANGUAGE_ENGLISH(default) or CMB_PRINT_LANGUAGE_CHINESE or CMB_PRINT_LANGUAGE_CHINESE_UTF8 */
+/* disable storing and printing firmware information */
+/* #define CMB_NOT_USING_FIRMWARE_INFO */
 #endif
 
 #endif /* _CMB_CFG_H_ */