embedded

I am trying to get this tutorial to work as intended without success (Something fails after the bl main instruction). According to the tutorial the command (qemu) xp /1dw 0xa0000018 should result in the print 33 (But i get 0x00 instead) a0000018: 33 This is the content of the registers after the main call (see startup.s) (qemu) info registers R00=a000001c R01=a000001c R02=00000006 R03=00000000 R04=00000000 R05=00000005 R06=00000006 R07=00000007 R08=00000008 R09=00000009 R10=00000000 R11=a3fffffc R12=00000000 R13=00000000 R14=0000003c R15=00000004 PSR=800001db N--- A und32 FPSCR: 00000000 I

I'm hoping maybe someone has a quick answer for this but essentially when I turn on optimizations, I get the following error: [elxr] (error) small data area overflow: 0xfff9f6fc (signed) didn't fit in 16 bits while performing relocation in file test_main.o at location __sti___13_test_main_cpp_252229d3+0xc, to reference symbol oe_init_intconn A similar error occurs when I put in this linker directive as well: -auto_sda Their manual doesn't make any mention of this linker error. I'm using Integrity 5.10 This linker error is usually not related to the -Olink optimization -auto_sda . The linker

Can I use functions malloc and delete in embedded C? For example, I have one function, where was created pointer on structure with function malloc. This function return address in ram and I can use this . After exit from my function, where memory was allocated, this pointer will be deleted or this memory reserved for this, while not will be function delete terminated ? Typedef struct { Char varA; Char varB } myStruct ; Void myfunc ( void) { myStruct * ptrStruct = ( myStruct *) malloc ( sizeof (myStruct)) ; // Code here //........ return ; } Yes, you can use malloc in embedded C. Some embedded

The linker is reporting multiply defined errors for an inline function. I have the following code in a header file: struct Port_Pin { volatile uint32_t * port_addr_set_value; //!< Writing the pin value here sets the pin to high. volatile uint32_t * port_addr_clr_value; //!< Writing the pin value to this port clears the pin to low. volatile uint32_t * port_addr_read_value; //!< Address to read pin value. volatile uint32_t * port_addr_enable; //!< Writing the pin value here enables the pin (for reading or writing). volatile uint32_t * port_addr_disable; //!< Writing the pin value here disables

I'm currently in the process of writing an intermediate-memory bootloader for an ATMega. I'd like to place a section of commonly used functions and data in a specific location in memory, such that: limited size of the bootloader section is not overcome library functions, drivers, etc, are not reproduced by the application section and thus wasting space For illustrative purposes, a map of the desired memory layout is below: Following some help in this thread on avrfreaks, I'm to the point where I've been able to move all code (in my bootloader + library development environment - applications

How does software perform floating point arithmetic when the CPU has no (or buggy) floating point unit? Examples would be the PIC, AVR, and 8051 microcontrollers architectures. "Emulated" is the wrong term in the context of PIC, AVR and 8051. Floating-point emulation refers to the emulation of FPU hardware on architectures that have an FPU option but for which not all parts include the FPU. This allows a binary containing floating point instructions to run on a variant without an FPU. Where used, FPU emulation is implemented as an invalid-instruction exception handler ; when an FPU instruction

The start address 0x4806E000 (UART4 base address) is already present in /proc/iomem with the name omap4-uart. How to disable the memory regions already allocated ?. Edit : Even though request_mem_region is successful the console during booting shows this messages. [ 0.758514] Serial: 8250/16550 driver, 3 ports, IRQ sharing enabled [ 0.760040] omap_uart.0: ttyO0 at MMIO 0x4806a000 (irq = 104) is a OMAP UART0 [ 0.760498] omap_uart.1: ttyO1 at MMIO 0x4806c000 (irq = 105) is a OMAP UART1 [ 0.760955] omap_uart.2: ttyO2 at MMIO 0x48020000 (irq = 106) is a OMAP UART2 [ 1.778808] console [ttyO2]