Microchip Taiwan - ATSAME54P20A--定址 [32-bit SAM MCU (ARM® core)]

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Libra

Re: ATSAME54P20A--定址

管理員

你好, 這個部分有兩個問題
1. 原先的寫法
uint8_t Can0MessageRAM[CAN0_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20000000)));
uint8_t Can1MessageRAM[CAN1_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20000000 + CAN0_MESSAGE_RAM_CONFIG_SIZE)));

CAN0_MESSAGE_RAM_CONFIG_SIZE = 56
Can1MessageRAM 的 address 因為aligned(32)的關係, 會等於address(0x20000000 + 32), 導致 Can1MessageRAM 記憶體位址去疊到Can0MessageRAM
Can0MessageRAM @ 0x20000000, size 56 (0x20000000 ~ 0x20000038)
Can1MessageRAM @ 0x20000020, size 56
所以請拿掉aligned(32)或是將Can1MessageRAM的定址取為32的倍數
最後
uint8_t Can0MessageRAM[CAN0_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20000020)));
uint8_t Can1MessageRAM[CAN1_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20000020 + ((CAN0_MESSAGE_RAM_CONFIG_SIZE%32)+1)*32)));

2. 另外一個問題是上面你看到, 起始位置不是在0x20000000而是自0x20000020開始, 你看MAP file時會發現前面0x20000000開始有保留一小塊區塊, 這部分需要避開
.bss 0x20000000 0x10 16 Uninitialized data
這部分會因為你用到的Harmony Module而不同, 看起來是因為SYS_Tick Module拿去用了, 我建的專案佔了0x0C, 你的佔了0x10, 因為aligned(32)所以我將起始位置移到0x20000020

發表於: 2020/5/22 11:46

Gordon0010

Re: ATSAME54P20A--定址

新會員

假如我將定址改到其他位址。


uint8_t Can0MessageRAM[CAN0_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20010000)));                                 



uint8_t Can1MessageRAM[CAN1_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20010000 + CAN0_MESSAGE_RAM_CONFIG_SIZE)));

確認map檔內容無誤。


_0c5519485ec73812%1                 

0x20010060       0x60  

_0c5519485ec73812                

 0x20010060       0x60 build/sam_e54_xpro/production/_ext/1360937237/main_e54.o  

               

0x20010060                Can1MessageRAM  

_0c5518f05ec73812%2                 

0x20010000       0x60 

 _0c5518f05ec73812 



0x20010000       0x60 build/sam_e54_xpro/production/_ext/1360937237/main_e54.o                 

0x20010000                Can0MessageRAM





RAM Data-Memory Usage

section                    address  length [bytes]      (dec)  Description

-------                 ----------  -------------------------  -----------

.bss                    0x20000000           0x10          16  Uninitialized data 

.data.impure_data       0x20000010          0x418        1048   

.data.__malloc_av_      0x20000428          0x408        1032   

.data.__global_locale   0x20000830          0x16c         364   

.bss.message            0x2000099c           0x40          64   

.bss.rx_message         0x200009dc           0x40          64   

.bss.can1RxMsg          0x20000a1c           0x30          48   

.bss.can0RxMsg          0x20000a4c           0x30          48   

.bss.can1Obj            0x20000a7c           0x28          40   

.bss.can0Obj            0x20000aa4           0x28          40   

.bss.__malloc_current_m 0x20000acc           0x28          40   

.bss.can1CallbackObj    0x20000af4           0x20          32   

.bss.can0CallbackObj    0x20000b14           0x20          32   

.bss                    0x20000b34           0x1c          28  Uninitialized data 

.bss.messageID          0x20000b50            0x4           4   

.bss.rx_messageID       0x20000b54            0x4           4   

.bss.xferContext        0x20000b58            0x4           4   

.data._impure_ptr       0x20000b5c            0x4           4   

.bss.__malloc_max_sbrke 0x20000b60            0x4           4   

.bss.__malloc_max_total 0x20000b64            0x4           4   

.bss.__malloc_top_pad   0x20000b68            0x4           4   

.data.__malloc_sbrk_bas 0x20000b6c            0x4           4   

.data.__malloc_trim_thr 0x20000b70            0x4           4   

.bss                    0x20000b74            0x4           4  Uninitialized data 

.bss.timestamp          0x20000b78            0x2           2   

.bss.messageMarker.8529 0x20000b7a            0x1           1   

.bss.loop_count         0x20000b7b            0x1           1   

.bss.messageLength      0x20000b7c            0x1           1   

.bss.rx_messageLength   0x20000b7d            0x1           1   

.data.state             0x20000b7e            0x1           1   

_0c63b8f05ec7381b       0x20010000           0x60          96   

_0c63b9485ec7381b       0x20010060           0x60          96   

         Total RAM used  :       0xc3f        3135  1.2% of 0x40000

        --------------------------------------------------------------------------

            Total Data Memory used  :       0xc3f        3135  1.2% of 0x40000

        --------------------------------------------------------------------------

但是通訊會有問題，data傳送內容為0x00，ID也是為0x00，
當然不定址就不會有這樣的狀況。
因為有特殊規劃，所以需要定址。
有無方式可以排除此狀況。

發表於: 2020/5/22 10:51

Gordon0010

ATSAME54P20A--定址

新會員

想請問為何使用絕對定址但出現錯誤？


#include <stddef.h>      // Defines NULL

#include <stdbool.h>     // Defines true

#include <stdlib.h>      // Defines EXIT_FAILURE

#include "definitions.h" // SYS function prototypes

//=========================================================================================================================================================

uint8_t Can0MessageRAM[CAN0_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20000000)));                                

uint8_t Can1MessageRAM[CAN1_MESSAGE_RAM_CONFIG_SIZE] __attribute__((aligned(32), address(0x20000000 + CAN0_MESSAGE_RAM_CONFIG_SIZE))); 

 int main(void)

{

    /* Initialize all modules */

    SYS_Initialize(NULL);

    SYSTICK_TimerStart();

    LED0_Set();

    SYSTICK_DelayMs(100);



    /* Set Message RAM Configuration */

    CAN0_MessageRAMConfigSet(Can0MessageRAM);

    CAN1_MessageRAMConfigSet(Can1MessageRAM);

    CAN1_RxCallbackRegister(APP_CAN_Callback, (uintptr_t)APP_STATE_CAN_RECEIVE, CAN_MSG_ATTR_RX_FIFO0);

    CAN1_TxCallbackRegister(APP_CAN_Callback, (uintptr_t)APP_STATE_CAN_TRANSMIT);

    display_menu();

    while (true)

    {

     }

}

//不知為何0x20000000及 CAN0_MESSAGE_RAM_CONFIG_SIZE中間的加號無法顯示

以下為compiler的錯誤訊息


Link Error: Could not allocate section '_0c4b18f05ec644c4' at 0x20000000  

Link Error: Could not allocate data memory 

collect2.exe: error: ld returned 255 exit status 

make[2]: *** [nbproject/Makefile-sam_e54_xpro.mk:336: dist/sam_e54_xpro/production/sam_e54_xpro.X.production.hex] Error 255 

make[1]: *** [nbproject/Makefile-sam_e54_xpro.mk:94: .build-conf] Error 2 

make: *** [nbproject/Makefile-impl.mk:39: .build-impl] Error 2  

BUILD FAILED (exit value 2, total time: 3s)