keil

问题 I'm writing code in ARM assembly language on the Freescale Freedom KL46Z board in the Keil uVision 5 environment. My code is quite lengthy, but in the main part of the code, whenever I try to load (LDR) a constant or variable, I get this error: error: A1284E: Literal pool too distant, use LTORG to assemble it within 4KB I have no idea what this means or how to fix it. The spots where the errors occur are all on similar instructions. For example, the first error is on an instruction that reads

问题 I am trying to send data from the arm cortrx m4 microcontroller to pc through usb. There is a program written in C++ language in codeblocks ide. Basically the program sets the serial communication settings and read data using ReadFile function. The problem is I am getting garbage values at the output even if the baud rate in pc proogram and microcontroller is same. How can I solve this problem? The pc program is shown below. #include <Windows.h> #include <stdio.h> int main(void) { HANDLE

问题 How to write function at particular memory location in flash memory? Is there any directive for that? Do i need particular linker? 回答1: If you are using keil ide you can place a function at a specific address using .ARM.__at_address as the section name. To place the function add at 0x20000, specify: int add(int n1,int n2) __attribute__((section(".ARM.__at_0x20000"))); int add(int n1,int n2) { return n1+n2; } 回答2: Do you use the keil toolchain? If yes, perhaps http://www.keil.com/support/docs

问题 When I use this struct just after flashing device it works well, but after restarting (power on/off) using this struct(assign to any bit) cause a HardFault irq. I use Keil uVision with STM32F205. Why it not works? and what should I change/remove/add to fix it? Direct using GPIOC->ODR don't cause any problems what is wrong with bitfields in Kail? #pragma anon_unions typedef union { struct { __IO uint16_t Data_Bus:8; // 0-7 data bus __IO uint16_t Ctr_Pins:6; // 8-13 control pins __IO uint16_t

问题 I am using Keil uVision and I keep getting this error: C:\Keil_v5\ARM\ARMCC\bin\..\include\rw/_defs.h(781): error: #20: identifier "namespace" is undefined What could lead to this error? Isn´t namespace automatically defined? 回答1: It looks like you are using C compilation for C++ code - check the compiler options. In C++ namespace is a reserved word, but not in C, so the compiler will try to interpret it as an identifier rather than a keyword - which will then of course make no sense

问题 Code: dest EQU 0x40000000 AREA name, CODE, READONLY ENTRY MOV r0, #2 LDR r1, =dest STR r0, [r1] stop B stop END This code writes the value of 2 to memory location 0x40000000. When I change this to 0x20000000, 2 fails to get written there. Same thing with 0x3FFFFFFF. When I set the memory location to 0x40003FFF, 2 gets printed onto that location, but when I change the address to 0x40004000, 2 fails to get printed there. Same thing for any address locations higher, like 0x50000000. So according