From 3e419303a7f20c02b9d8de506dae70e33c0a1894 Mon Sep 17 00:00:00 2001
From: "Sergio R. Caprile" <scaprile@cesanta.com>
Date: Mon, 6 Mar 2023 17:32:43 -0300
Subject: [PATCH] read MAC from flash

---
 examples/ti/ek-tm4c1294xl-baremetal/hal.h  | 10 ++++++++++
 examples/ti/ek-tm4c1294xl-baremetal/main.c |  2 +-
 examples/ti/ek-tm4c1294xl-freertos/hal.h   | 10 ++++++++++
 examples/ti/ek-tm4c1294xl-freertos/main.c  |  2 +-
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/examples/ti/ek-tm4c1294xl-baremetal/hal.h b/examples/ti/ek-tm4c1294xl-baremetal/hal.h
index 30628a7c..457d2999 100644
--- a/examples/ti/ek-tm4c1294xl-baremetal/hal.h
+++ b/examples/ti/ek-tm4c1294xl-baremetal/hal.h
@@ -173,3 +173,13 @@ static inline int uart_read_ready(UART0_Type *uart) {
 static inline uint8_t uart_read_byte(UART0_Type *uart) {
   return (uint8_t) (uart->DR & 0xFF);
 }
+
+// Helper macro for reading pre-flashed MAC from user registers
+#define READ_PREFLASHED_MAC()                                               \
+  {                                                                         \
+    (FLASH_CTRL->USERREG0 >> 0) & 0xFF, (FLASH_CTRL->USERREG0 >> 8) & 0xFF, \
+        (FLASH_CTRL->USERREG0 >> 16) & 0xFF,                                \
+        (FLASH_CTRL->USERREG1 >> 0) & 0xFF,                                 \
+        (FLASH_CTRL->USERREG1 >> 8) & 0xFF,                                 \
+        (FLASH_CTRL->USERREG1 >> 16) & 0xFF                                 \
+  }
diff --git a/examples/ti/ek-tm4c1294xl-baremetal/main.c b/examples/ti/ek-tm4c1294xl-baremetal/main.c
index 05dca4fe..f5221b8b 100644
--- a/examples/ti/ek-tm4c1294xl-baremetal/main.c
+++ b/examples/ti/ek-tm4c1294xl-baremetal/main.c
@@ -72,7 +72,7 @@ int main(void) {
   struct mg_tcpip_driver_tm4c_data driver_data = {.mdc_cr =
                                                       1};  // See driver_tm4c.h
   struct mg_tcpip_if mif = {
-      .mac = {2, 0, 1, 2, 3, 5},
+      .mac = READ_PREFLASHED_MAC(),
       .driver = &mg_tcpip_driver_tm4c,
       .driver_data = &driver_data,
   };
diff --git a/examples/ti/ek-tm4c1294xl-freertos/hal.h b/examples/ti/ek-tm4c1294xl-freertos/hal.h
index 30628a7c..457d2999 100644
--- a/examples/ti/ek-tm4c1294xl-freertos/hal.h
+++ b/examples/ti/ek-tm4c1294xl-freertos/hal.h
@@ -173,3 +173,13 @@ static inline int uart_read_ready(UART0_Type *uart) {
 static inline uint8_t uart_read_byte(UART0_Type *uart) {
   return (uint8_t) (uart->DR & 0xFF);
 }
+
+// Helper macro for reading pre-flashed MAC from user registers
+#define READ_PREFLASHED_MAC()                                               \
+  {                                                                         \
+    (FLASH_CTRL->USERREG0 >> 0) & 0xFF, (FLASH_CTRL->USERREG0 >> 8) & 0xFF, \
+        (FLASH_CTRL->USERREG0 >> 16) & 0xFF,                                \
+        (FLASH_CTRL->USERREG1 >> 0) & 0xFF,                                 \
+        (FLASH_CTRL->USERREG1 >> 8) & 0xFF,                                 \
+        (FLASH_CTRL->USERREG1 >> 16) & 0xFF                                 \
+  }
diff --git a/examples/ti/ek-tm4c1294xl-freertos/main.c b/examples/ti/ek-tm4c1294xl-freertos/main.c
index eb839431..74279af8 100644
--- a/examples/ti/ek-tm4c1294xl-freertos/main.c
+++ b/examples/ti/ek-tm4c1294xl-freertos/main.c
@@ -57,7 +57,7 @@ static void server(void *args) {
   ethernet_init();
   struct mg_tcpip_driver_tm4c_data driver_data = {.mdc_cr = 1};
   struct mg_tcpip_if mif = {
-      .mac = {2, 0, 1, 2, 3, 5},
+      .mac = READ_PREFLASHED_MAC(),
       .driver = &mg_tcpip_driver_tm4c,
       .driver_data = &driver_data,
   };