firmware: Add 64 bit MAC to shell prompt

This demonstrates that the readout of the 64 bit MAC address from the
STM32WL55 microcontroller works and is useful to recognize used devices.

1 files changed, 32 insertions, 0 deletions

diff --git a/firmware/src/main.c b/firmware/src/main.c
index 7a1076c..e1c85c6 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -1,6 +1,38 @@
+#include <stdio.h>
+
 #include <zephyr/kernel.h>
+#include <zephyr/shell/shell.h>
+#include <zephyr/shell/shell_backend.h>
+
+#include "uid64.h"
+
+static uint64_t uid = 0;
+static char uid_str[UID64_STR_LEN];
+
+#define MAX_PROMPT_SIZE 80
+char prompt[MAX_PROMPT_SIZE];
+
+void init_uid64(void) {
+	uid = uid64_get();
+	uid64_to_string(uid, uid_str);
+}
+
+void init_shell_prompt(void) {
+	if (uid64_available()) {
+		snprintf(prompt, MAX_PROMPT_SIZE, "[iot-core %s] ", uid_str);
+	} else {
+		strncpy(prompt, "[iot-core without MAC] ", MAX_PROMPT_SIZE);
+	}
+	for (int i = 0; i < shell_backend_count_get(); i++) {
+		const struct shell *sh = shell_backend_get(i);
+		(void) shell_prompt_change(sh, (const char *)prompt);
+	}
+}
 
 int main(void)
 {
+	init_uid64();
+	init_shell_prompt();
+
 	return 0;
 }