add unique id for imxrt

hw/bsp/board_api.h

@@ -24,8 +24,8 @@
  * This file is part of the TinyUSB stack.
  */
 
-#ifndef _BOARD_API_H_
+#ifndef BOARD_API_H_
-#define _BOARD_API_H_
+#define BOARD_API_H_
 
 #ifdef __cplusplus
 extern "C" {

hw/bsp/imxrt/family.c

@@ -40,6 +40,7 @@
 #include "fsl_iomuxc.h"
 #include "fsl_clock.h"
 #include "fsl_lpuart.h"
+#include "fsl_ocotp.h"
 
 #ifdef __GNUC__
 #pragma GCC diagnostic pop
@@ -186,6 +187,29 @@ uint32_t board_button_read(void) {
   return BUTTON_STATE_ACTIVE == GPIO_PinRead(BUTTON_PORT, BUTTON_PIN);
 }
 
+size_t board_get_unique_id(uint8_t id[], size_t max_len) {
+  (void) max_len;
+
+  #if FSL_FEATURE_OCOTP_HAS_TIMING_CTRL
+  OCOTP_Init(OCOTP, CLOCK_GetFreq(kCLOCK_IpgClk));
+  #else
+  OCOTP_Init(OCOTP, 0u);
+  #endif
+
+  // Reads shadow registers 0x01 - 0x04 (Configuration and Manufacturing Info)
+  // into 8 bit wide destination, avoiding punning.
+  for (int i = 0; i < 4; ++i) {
+    uint32_t wr = OCOTP_ReadFuseShadowRegister(OCOTP, i + 1);
+    for (int j = 0; j < 4; j++) {
+      id[i*4+j] = wr & 0xff;
+      wr >>= 8;
+    }
+  }
+  OCOTP_Deinit(OCOTP);
+
+  return 16;
+}
+
 int board_uart_read(uint8_t* buf, int len) {
   int count = 0;
 

hw/bsp/imxrt/family.cmake

@@ -44,6 +44,7 @@ function(add_board_target BOARD_TARGET)
     ${SDK_DIR}/drivers/igpio/fsl_gpio.c
     ${SDK_DIR}/drivers/lpspi/fsl_lpspi.c
     ${SDK_DIR}/drivers/lpuart/fsl_lpuart.c
+    ${SDK_DIR}/drivers/ocotp/fsl_ocotp.c
     ${SDK_DIR}/devices/${MCU_VARIANT}/system_${MCU_VARIANT_WITH_CORE}.c
     ${SDK_DIR}/devices/${MCU_VARIANT}/xip/fsl_flexspi_nor_boot.c
     ${SDK_DIR}/devices/${MCU_VARIANT}/drivers/fsl_clock.c
@@ -75,6 +76,7 @@ function(add_board_target BOARD_TARGET)
     ${SDK_DIR}/drivers/igpio
     ${SDK_DIR}/drivers/lpspi
     ${SDK_DIR}/drivers/lpuart
+    ${SDK_DIR}/drivers/ocotp
     )
 
   update_board(${BOARD_TARGET})