CC05B RX Project Configuration Tips

Transcription

1 CC05B RX Project Configuration Tips John Breitenbach, Senior Engineering Manager Class ID: CC05B Renesas Electronics America Inc.

2 John Breitenbach Senior Engineering Manager Manage apps engineering team for RX & RL78 Software libraries, app notes, sample code Custom work for customers Life before Renesas Patent #7,054,045 for Holographic HMI First computers: Atari 800 Timex Sinclair K! 2

3 Renesas Technology & Solution Portfolio 3

4 8/16-bit 32-bit Microcontroller and Microprocessor Line-up DMIPS, Superscalar Automotive & Industrial, 65nm 600µA/MHz, 1.5µA standby 500 DMIPS, Low Power 32-Bit High Performance DSP, FPU with High Integration Automotive & Industrial, 90nm 600µA/MHz, 1.5µA standby 1200 DMIPS, Performance Automotive, 40nm 500µA/MHz, 35µA deep standby 165 DMIPS, FPU, DSC Industrial, 90nm 500µA/MHz, 1.6µA deep standby 165 DMIPS, FPU, DSC Industrial, 40nm 200µA/MHz, 0.3µA deep standby 25 DMIPS, Low Power Industrial & Automotive, 150nm 190µA/MHz, 0.3µA standby 10 DMIPS, Capacitive Touch Industrial & Automotive, 130nm Wide 350µA/MHz, Format 1µA LCDs standby 44 DMIPS, True Low Power Industrial & Automotive, 130nm 144µA/MHz, 0.2µA standby 4

5 Enabling The Smart Society Challenge: The Smart Society can only be made possible by Smart Products. You, the Smart Engineers, are the ones who must create these Smart Products in ever shorter design cycles. Solution: This session will make you Smarter Engineers by shining a light on some of the most common stumbling blocks for engineers working on RX-based products. 5

6 Agenda Reset & interrupt vectors Flash-based options ID code Stacks & heaps Clock C runtime environment Review of startup code Q & A 6

7 Reset & Interrupt Vectors Two vector tables Fixed vector table top of memory (0xFFFFFF80 to 0xFFFFFFFF) Relocatable vector table (auto-generated & #pragmas) Fixed Vectors Reset Vector - make sure you have one! Fixed_Vectors[] in vector_table.c Other Exceptions: undefined inst., NMI, supervisor violation Also includes ID code for some parts Relocatable vectors Contains vectors for peripherals (>200) Startup code points INTB to relocatable vector table Tip: Use the default handler ( Empty Vector ) 7

8 Flash-Based Options (RX63X, RX21x) WDT, IWDT, LVDT, HOCO, endian Some located in the fixed vector table Some located in User Boot Flash All 0xFF s (erased) means No watchdogs Little-endian HOCO off at boot Low-voltage monitor 0 reset disabled Located in the one of the following places HEW project generator: Flash_options.c e 2 studio blank project: vector_table.c FIT: r_bsp_config.h 8

9 Flash-Based ID Code Used to protect chip from unauthorized read/modifications Three modes: No protection Always reports non-matching ID (permanent lock) Allows access w/ matching ID Detailed in ROM chapter of HW Manual Lives in fixed vector table Be careful you don t have code/constants there If you do, you ll lock yourself out! Locked chips can be erased & recovered in serial boot mode Where to find it: Fixed vector table in vector_table.c FIT: r_bsp_config.h 9

10 Stacks & Heaps Q: What s the difference between stack and heap? Stack Heap Automatic variables (locals) Dynamically allocated memory Parameters for function calls Malloc/Calloc Return address for function calls C++ new() Automatic create & clean-up Stays allocated until clean-up Fast create/delete Slow create/delete Required Optional 10

11 Stacks & Heaps Stacks Two stacks on the RX: User & Interrupt User stack is optional Each has independent size Three steps to use: 1. Define the size 2. Define the location 3. Load them at startup Project Type Size Location Load RX C Stacksct.h Linker map #pragma stacksize FIT Projects R_bsp_config.h Linker map #pragma stacksize GCC Linker map** Linker map** Reset_program.asm 11

12 Stacks & Heaps Heap Must include sbrk.c Located in RAM w/ the rest of static variables (section B_1) HEW project generator w/ RX C: Size defined in sbrk.h #define HEAPSIZE 0x4000 FIT projects: Size defined in r_bsp_config.h #define HEAP_BYTES (0x4000) GCC projects: uses ALL left-over RAM by default May not be what you want! 12

13 Stacks & Heaps Tips Put stacks at start of RAM (they grow down) Fill stack memory at startup with pattern Monitor it in debugger memory window Old school: Don t use heap if you can avoid it! Dynamic memory problems are hard to debug Can lead to non-deterministic behavior No error checking in default handler If you must use the heap Allocate memory soon after startup; don t free it Useful when buffers allocated based on runtime config 13

14 Clock Setup Specific to chip RX63x, RX21x Starts on LOCO (125 khz) Switch to high speed before C init RX610, RX62x crystal speed (usually 12 MHz) OK to do clock switch after C init Where to find it: HEW project generator: HWSetup.C (maybe) FIT: r_bsp_config.h 14

15 C Runtime Environment Initialization Copies initialized data from ROM to RAM char prompt[] = Enter name ; float setpoint = 72.5f; Zeroes uninitialized data Can be time-intensive Especially if running off LOCO Check ResetPRG.c for _INITSCT() call Switch to high-speed clock is BEFORE _INITSCT() Add additional sections to copy ROM to RAM Code for flash programming Add linker section; modify dbsct.c 15

16 RX startup code: RX610/RX62N (ResetPrg.c) #pragma entry PowerON_Reset_PC void PowerON_Reset_PC(void) { MVTC # H,USP // Only in mixed mode view MVTC # H,ISP // Relocatable vectors set_intb((void *) sectop("c$vect")); set_fpsw(fpsw_init); // Floating point status _INITSCT(); // Init C runtime HardwareSetup(); // Setup clock other hardware set_psw(psw_init); // Set Ubit & Ibit for PSW Change_PSW_PM_to_UserMode(); // Change PSW PM bit main(); // Call user code brk(); // Should never get here } 16

17 RX startup code: RX63x/RX210 (ResetPrg.c) void PowerON_Reset_PC(void) { MVTC # H,USP // Only in mixed mode view MVTC # H,ISP // Relocatable vectors set_intb((void *) sectop("c$vect")); set_fpsw(fpsw_init); // Floating point status operating_frequency_set(); // Set clock to high-speed _INITSCT(); // Init C runtime HardwareSetup(); // Setup other hardware set_psw(psw_init); // Set Ubit & Ibit for PSW Change_PSW_PM_to_UserMode(); // Change PSW PM bit main(); // Call user code brk(); // Should never get here } 17

18 A Quick Note On Other Settings Optimization Dang near impossible to outsmart the compiler Choose either Speed or Size A side note about the RX210 and the RX instruction set Turn off for debug Default project settings in HEW Doubles are singles by default Chars are unsigned by default Bit fields are right-to-left by default Warp speed, Scotty! I can t do it, Captain! Endian settings 18

19 Questions? 19

20 Enabling The Smart Society Challenge: The Smart Society can only be made possible by Smart Products. You, the Smart Engineers, are the ones who must create these Smart Products in ever shorter design cycles. Solution: This session will make you Smarter Engineers by shining a light on some of the most common stumbling blocks for engineers working on RX-based products. 20

21 Please Provide Your Feedback Please utilize the Guidebook application to leave feedback or Ask me for the paper feedback form for you to use 21

22 Renesas Electronics America Inc.