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Clean_TMC2209/lib/tmc/hal/Landungsbruecke/freescale/startup.S

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+/********************************************************************************
+  * \file      startup.s
+  * \brief     Startup file for Kinetis L (KL25Z).
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == __thumb_startup,
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  ******************************************************************************/
+  .syntax unified
+  .cpu cortex-m4
+  .thumb
+
+.global g_pfnVectors
+.global Default_Handler
+
+/* start address for the initialization values of the .data section. defined in linker script */
+.word ___ROM_AT
+/* start address for the .data section. defined in linker script */
+.word _sdata
+/* end address for the .data section. defined in linker script */
+.word _edata
+/* start address for the .bss section. defined in linker script */
+.word __START_BSS
+/* end address for the .bss section. defined in linker script */
+.word __END_BSS
+
+/**
+ * \brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called.
+ * \param  None
+ * \retval : None
+*/
+  .section .text.__thumb_startup
+  .weak __thumb_startup
+  .type __thumb_startup, %function
+__thumb_startup:
+/* Call the C hardware init function (which also has to switch off the watchdog) */
+  bl  __init_hardware
+
+/* Copy the data segment initializers from flash to SRAM: */
+  movs r1, #0
+  b LoopCopyDataInit
+
+CopyDataInit:
+  ldr r3, =___ROM_AT
+  ldr r3, [r3, r1]
+  str r3, [r0, r1]
+  adds r1, r1, #4
+
+LoopCopyDataInit:
+  ldr r0, =_sdata
+  ldr r3, =_edata
+  adds r2, r0, r1
+  cmp r2, r3
+  bcc CopyDataInit
+  ldr r2, =__START_BSS
+  b LoopFillZerobss
+
+/* Zero fill the bss segment: */
+FillZerobss:
+  movs r3, #0
+  str r3, [r2]
+  adds r2, r2, #4
+
+LoopFillZerobss:
+  ldr r3, = __END_BSS
+  cmp r2, r3
+  bcc FillZerobss
+/* Call the application's entry point: */
+  bl main
+  blx r0   /*Call the startup code of the application (address returned by the main() function of the boot loader)*/
+  bx lr
+.size __thumb_startup, .-__thumb_startup
+
+/****END OF FILE****/