diff options
Diffstat (limited to 'Projects/P-NUCLEO-WB55.Nucleo/Examples_MIX/SPI/SPI_FullDuplex_ComPolling_Slave/SW4STM32/startup_stm32wb55xx_cm4.s')
-rw-r--r-- | Projects/P-NUCLEO-WB55.Nucleo/Examples_MIX/SPI/SPI_FullDuplex_ComPolling_Slave/SW4STM32/startup_stm32wb55xx_cm4.s | 64 |
1 files changed, 41 insertions, 23 deletions
diff --git a/Projects/P-NUCLEO-WB55.Nucleo/Examples_MIX/SPI/SPI_FullDuplex_ComPolling_Slave/SW4STM32/startup_stm32wb55xx_cm4.s b/Projects/P-NUCLEO-WB55.Nucleo/Examples_MIX/SPI/SPI_FullDuplex_ComPolling_Slave/SW4STM32/startup_stm32wb55xx_cm4.s index 023c1b016..f79eec117 100644 --- a/Projects/P-NUCLEO-WB55.Nucleo/Examples_MIX/SPI/SPI_FullDuplex_ComPolling_Slave/SW4STM32/startup_stm32wb55xx_cm4.s +++ b/Projects/P-NUCLEO-WB55.Nucleo/Examples_MIX/SPI/SPI_FullDuplex_ComPolling_Slave/SW4STM32/startup_stm32wb55xx_cm4.s @@ -44,21 +44,29 @@ defined in linker script */ .word _sbss /* end address for the .bss section. defined in linker script */ .word _ebss - - .section .text.Reset_Handler - .weak Reset_Handler - .type Reset_Handler, %function -Reset_Handler: - ldr r0, =_estack - mov sp, r0 /* set stack pointer */ - -/* Copy the data segment initializers from flash to SRAM */ - ldr r0, =_sdata - ldr r1, =_edata - ldr r2, =_sidata +/* start address for the .MB_MEM2 section. defined in linker script */ +.word _sMB_MEM2 +/* end address for the .MB_MEM2 section. defined in linker script */ +.word _eMB_MEM2 + +/* INIT_BSS macro is used to fill the specified region [start : end] with zeros */ +.macro INIT_BSS start, end + ldr r0, =\start + ldr r1, =\end movs r3, #0 - b LoopCopyDataInit + bl LoopFillZerobss +.endm + +/* INIT_DATA macro is used to copy data in the region [start : end] starting from 'src' */ +.macro INIT_DATA start, end, src + ldr r0, =\start + ldr r1, =\end + ldr r2, =\src + movs r3, #0 + bl LoopCopyDataInit +.endm +.section .text.data_initializers CopyDataInit: ldr r4, [r2, r3] str r4, [r0, r3] @@ -67,21 +75,31 @@ CopyDataInit: LoopCopyDataInit: adds r4, r0, r3 cmp r4, r1 - bcc CopyDataInit - -/* Zero fill the bss segment. */ - ldr r2, =_sbss - ldr r4, =_ebss - movs r3, #0 - b LoopFillZerobss + bcc CopyDataInit + bx lr FillZerobss: - str r3, [r2] - adds r2, r2, #4 + str r3, [r0] + adds r0, r0, #4 LoopFillZerobss: - cmp r2, r4 + cmp r0, r1 bcc FillZerobss + bx lr + + .section .text.Reset_Handler + .weak Reset_Handler + .type Reset_Handler, %function +Reset_Handler: + ldr r0, =_estack + mov sp, r0 /* set stack pointer */ + +/* Copy the data segment initializers from flash to SRAM */ + INIT_DATA _sdata, _edata, _sidata + +/* Zero fill the bss segments. */ + INIT_BSS _sbss, _ebss + INIT_BSS _sMB_MEM2, _eMB_MEM2 /* Call the clock system intitialization function.*/ bl SystemInit |