Introduction to Micro-controller Software. Gary J. Minden September 3, PDF Free Download

Introduction to Micro-controller Software Gary J. Minden September 3, 2013 1

Microcontroller Software How developed Language (C) Tools Organization/Structure How deployed Organization in memory How executed 2

Tools -- Code Composer 3

Tools -- Behind Code Composer Your Program cpp cc A *.c *.c (Expanded) *.s *.asm (Assembler Code) *.h Definitions of Code you use (reference) 4

Tools -- Behind Code Composer A as ld B *.o (Object) *.bin *.out (Complete Program) *.lst *.o *.a Other programs Libraries *.map 5

Debugger 6

Debugging B Debug PC Putty Serial Communications LM3S1968 Eval Board 7

Typical C File static unsigned long Task0NextExecute = 0; static unsigned long Task0DeltaExecute = 50; // 50 SysTicks void Task0_Init() { // // Enable the GPIO Port G. // SysCtlPeripheralEnable( SYSCTL_PERIPH_GPIOG ); // // Configure GPIO_G to drive the Status LED. // GPIOPinTypeGPIOOutput( GPIO_PORTG_BASE, GPIO_PIN_2 ); 8

Typical Assembly Language ;--------------------------------------------------------------- ; 73 int W, X, Y, Z; ;---------------------------------------------------------------- LDR V1, [SP, #16] ; 72 ;---------------------------------------------------------------- ; 75 W = A + B + C; ;---------------------------------------------------------------- ADDS A1, A2, A1 ; 75 ADDS V2, A3, A1 ; 75 ;---------------------------------------------------------------- ; 76 X = B + C + D; ;---------------------------------------------------------------- ADDS A1, A3, A2 ; 76 ADDS A2, A4, A1 ; 76 ;---------------------------------------------------------------- ; 77 Y = C + D + E; ;---------------------------------------------------------------- ADDS A1, A4, A3 ; 77 ADDS A3, V1, A1 ; 77 ;---------------------------------------------------------------- 9

Typical Listing File 360 00000000 Task0_Init: 361 ;* ----------------------------------------------------------------------* 362.dwcfi cfa_offset, 0 363 00000000 B510 PUSH {V1, LR} ; [DPU_3_PIPE] ; [ORIG 16-BIT INS] 364.dwcfi cfa_offset, 4 365.dwcfi save_reg_to_mem, 14, -4 366.dwcfi cfa_offset, 8 367.dwcfi save_reg_to_mem, 4, -8 368.dwcfi cfa_offset, 8 369.dwpsn file "../Task_Blinky.c",line 90,column 5,is_stmt,isa 1 370 00000002 480B LDR A1, $C$CON1 ; [DPU_3_PIPE] 90 ; [ORIG 16-BIT INS] 371 $C$DW$52.dwtag DW_TAG_TI_branch 372.dwattr $C$DW$52, DW_AT_low_pc(0x00) 373.dwattr $C$DW$52, DW_AT_name("SysCtlPeripheralEnable") 374.dwattr $C$DW$52, DW_AT_TI_call 375 00000004 FFFEF7FF! BL SysCtlPeripheralEnable ; [DPU_3_PIPE] 90 ; [KEEP 32-BIT INS] 376 ; CALL OCCURS {SysCtlPeripheralEnable } ; [] 90 377.dwpsn file "../Task_Blinky.c",line 96,column 5,is_stmt,isa 1 378 00000008 4C0A LDR V1, $C$CON2 ; [DPU_3_PIPE] 96 ; [ORIG 16-BIT INS] Relative Memory Address 10

Tools -- Behind Code Composer A as ld B *.o (Object) *.bin *.out (Complete Program) *.lst *.o *.a Other programs Libraries *.map 15

Typical Map File SEGMENT ALLOCATION MAP run origin load origin length init length attrs members ---------- ----------- ---------- ----------- ----- ------- 00000000 00000000 000004a8 000004a8 r-x 00000000 00000000 0000011c 0000011c r--.intvecs 0000011c 0000011c 0000036c 0000036c r-x.text 00000488 00000488 00000020 00000020 r--.cinit 20000000 20000000 00000800 00000000 rw- 20000000 20000000 00000800 00000000 rw-.stack 20000800 20000800 00000018 00000018 rw- 20000800 20000800 00000018 00000018 rw-.data Segment Memory Start Address Segment Memory Size (Bytes) Segment Init. Size (Bytes) Segment Attributes Segment Name Segment == Section Values in Hex 16

CPU/Memory Structure Data Path Memory Addresses Data Memory Instruction Processing CPU 17

Memory Structure Address Array of data bytes Grouped 4-bytes to a Word, 32-bit words CPU provides address CPU reads (copies) data from memory to CPU OR CPU writes new data to Memory To/From Memory & I/O Bus 18

LM3S1968 Memory Map Peripherals 0x400F EFFF 0x4000 0000 Variables Stack SRAM 0x2000 FFFF 0x2000 0000 64 KB Programs Constants Interrupt Vectors Flash 0x0003 FFFF 0x0000 0000 256 KB 19

Introduction to Micro-controller Software. Gary J. Minden September 3, 2013