Add stack checking functions

stm-firmware/include/reflow-controller/stack-check.h

@@ -18,8 +18,24 @@
 * If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #ifndef __STACK_CHECK_H__
 #define __STACK_CHECK_H__
 
+#include <stdint.h>
+
+#define STACK_CHECK_MIN_HEAP_GAP 16UL
+
+int32_t stack_check_get_usage();
+
+int32_t stack_check_get_free();
+
+static inline uint32_t read_stack_pointer()
+{
+	uint32_t stack_pointer;
+
+	__asm__ __volatile__ ("mov %0, sp\n\t" : "=r"(stack_pointer) : : );
+
+	return stack_pointer;
+}
+
 #endif /* __STACK_CHECK_H__ */

stm-firmware/shell.c

@@ -29,6 +29,7 @@
 #include <stm-periph/unique-id.h>
 #include <reflow-controller/calibration.h>
 #include <reflow-controller/temp-converter.h>
+#include <reflow-controller/stack-check.h>
 
 #ifndef GIT_VER
 #define GIT_VER "VERSION NOT SET"
@@ -201,6 +202,24 @@ static shellmatta_retCode_t shell_cmd_cal(const shellmatta_handle_t   handle,
 	calibration_sequence_shell_cmd(handle);
 	return SHELLMATTA_OK;
 }
+
+static shellmatta_retCode_t shell_get_sp(const shellmatta_handle_t   handle,
+						  const char                  *arguments,
+						  uint32_t length)
+{
+	(void)arguments;
+	(void)length;
+
+	shellmatta_printf(handle,
+				"Stack pointer: %p\r\n"
+				"Stack usage: 0x%x bytes\r\n"
+				"Lim to heap: 0x%x bytes\r\n",
+				read_stack_pointer(),
+				stack_check_get_usage(),
+				stack_check_get_free());
+	return SHELLMATTA_OK;
+}
+
 //typedef struct shellmatta_cmd
 //{
 //    char                    *cmd;       /**< command name                           */
@@ -211,7 +230,7 @@ static shellmatta_retCode_t shell_cmd_cal(const shellmatta_handle_t   handle,
 //    struct shellmatta_cmd   *next;      /**< pointer to next command or NULL        */
 //} shellmatta_cmd_t;
 
-static shellmatta_cmd_t cmd[7] = {
+static shellmatta_cmd_t cmd[8] = {
 	{
 		.cmd = "version",
 		.cmdAlias = "ver",
@@ -266,6 +285,14 @@ static shellmatta_cmd_t cmd[7] = {
 		.helpText = "Calibrate resistance measurement",
 		.usageText = "",
 		.cmdFct = shell_cmd_cal,
+		.next = &cmd[7],
+	},
+	{
+		.cmd = "get-stack-pointer",
+		.cmdAlias = "sp",
+		.helpText = "Get the stack pointer",
+		.usageText = "",
+		.cmdFct = shell_get_sp,
 		.next = NULL,
 	}
 };

stm-firmware/stack-check.c

@@ -19,3 +19,29 @@
 */
 
 #include <reflow-controller/stack-check.h>
+#include <stdint.h>
+
+extern char _estack;
+extern char heap_top;
+
+int32_t stack_check_get_usage()
+{
+	uint32_t stack_top;
+	uint32_t stack_ptr;
+
+	stack_ptr = read_stack_pointer();
+	stack_top = (uint32_t)&_estack;
+
+	return stack_top - stack_ptr;
+}
+
+int32_t stack_check_get_free()
+{
+	uint32_t upper_heap_boundary;
+	uint32_t stack_ptr;
+
+	stack_ptr = read_stack_pointer();
+	upper_heap_boundary = (uint32_t)&heap_top;
+
+	return stack_ptr - upper_heap_boundary;
+}