Frank 26080115
These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
Cortex-M3/Privilege_mode/abstract.h@0:bf7b9fba3924, 2011-03-20 (annotated)
- Committer:
- frank26080115
- Date:
- Sun Mar 20 05:38:56 2011 +0000
- Revision:
- 0:bf7b9fba3924
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| frank26080115 | 0:bf7b9fba3924 | 1 | ******************** (C) COPYRIGHT 2010 NXPSemiconductors ******************* |
| frank26080115 | 0:bf7b9fba3924 | 2 | * @file Cortex-M3\Privilege_mode\abstract.txt |
| frank26080115 | 0:bf7b9fba3924 | 3 | * @author NXP MCU SW Application Team |
| frank26080115 | 0:bf7b9fba3924 | 4 | * @version 2.0 |
| frank26080115 | 0:bf7b9fba3924 | 5 | * @date |
| frank26080115 | 0:bf7b9fba3924 | 6 | * @brief Description of the Privilege mode example. |
| frank26080115 | 0:bf7b9fba3924 | 7 | ****************************************************************************** |
| frank26080115 | 0:bf7b9fba3924 | 8 | * Software that is described herein is for illustrative purposes only |
| frank26080115 | 0:bf7b9fba3924 | 9 | * which provides customers with programming information regarding the |
| frank26080115 | 0:bf7b9fba3924 | 10 | * products. This software is supplied "AS IS" without any warranties. |
| frank26080115 | 0:bf7b9fba3924 | 11 | * NXP Semiconductors assumes no responsibility or liability for the |
| frank26080115 | 0:bf7b9fba3924 | 12 | * use of the software, conveys no license or title under any patent, |
| frank26080115 | 0:bf7b9fba3924 | 13 | * copyright, or mask work right to the product. NXP Semiconductors |
| frank26080115 | 0:bf7b9fba3924 | 14 | * reserves the right to make changes in the software without |
| frank26080115 | 0:bf7b9fba3924 | 15 | * notification. NXP Semiconductors also make no representation or |
| frank26080115 | 0:bf7b9fba3924 | 16 | * warranty that such application will be suitable for the specified |
| frank26080115 | 0:bf7b9fba3924 | 17 | * use without further testing or modification. |
| frank26080115 | 0:bf7b9fba3924 | 18 | ****************************************************************************** |
| frank26080115 | 0:bf7b9fba3924 | 19 | |
| frank26080115 | 0:bf7b9fba3924 | 20 | @Example description: |
| frank26080115 | 0:bf7b9fba3924 | 21 | Purpose: |
| frank26080115 | 0:bf7b9fba3924 | 22 | This example describes how to change privilege to unprivilege mode and vice vesa. |
| frank26080115 | 0:bf7b9fba3924 | 23 | Process: |
| frank26080115 | 0:bf7b9fba3924 | 24 | CONTROL[0] register controls the privilege level for software execution when the |
| frank26080115 | 0:bf7b9fba3924 | 25 | processor is in Thread mode. So, we can access to get/set CONTROL[0] to change Thread |
| frank26080115 | 0:bf7b9fba3924 | 26 | mode privilege level. |
| frank26080115 | 0:bf7b9fba3924 | 27 | |
| frank26080115 | 0:bf7b9fba3924 | 28 | Out of reset, Thread mode is privilege. |
| frank26080115 | 0:bf7b9fba3924 | 29 | Read CONTROL[0] to check if it is truly privilege or not. |
| frank26080115 | 0:bf7b9fba3924 | 30 | If Thread mode is not privilege, so it's not compliant with Cortex-M3 Technical, the |
| frank26080115 | 0:bf7b9fba3924 | 31 | program will enter into infinite error loop. |
| frank26080115 | 0:bf7b9fba3924 | 32 | Then, set CONTROL[0] = 1, changing Thread mode to unprivilege. |
| frank26080115 | 0:bf7b9fba3924 | 33 | Re-check by re-read CONTROL[0] again. |
| frank26080115 | 0:bf7b9fba3924 | 34 | A system service will be call __SCV(). In this exception mode, we can switch back Thread |
| frank26080115 | 0:bf7b9fba3924 | 35 | mode into privilege |
| frank26080115 | 0:bf7b9fba3924 | 36 | (Note that: |
| frank26080115 | 0:bf7b9fba3924 | 37 | When Thread mode has been changed from privilege to use, it cannot change ifself back |
| frank26080115 | 0:bf7b9fba3924 | 38 | to privilege. Only a handler can change the privilege of Thread mode. |
| frank26080115 | 0:bf7b9fba3924 | 39 | Handler mode is always privilege. |
| frank26080115 | 0:bf7b9fba3924 | 40 | ) |
| frank26080115 | 0:bf7b9fba3924 | 41 | After call handler, get CONTROL[0] to check if it is truly privilege or not. |
| frank26080115 | 0:bf7b9fba3924 | 42 | If not, program will enter to error loop. |
| frank26080115 | 0:bf7b9fba3924 | 43 | |
| frank26080115 | 0:bf7b9fba3924 | 44 | We use two LED to display status of Thread mode. |
| frank26080115 | 0:bf7b9fba3924 | 45 | LED1: turn on if Thread mode is privilege. |
| frank26080115 | 0:bf7b9fba3924 | 46 | LED2: turn on if Thread mode is unprivilege. |
| frank26080115 | 0:bf7b9fba3924 | 47 | - Using MCB1700 board: LED1 is P1.28, LED2 is P1.29 |
| frank26080115 | 0:bf7b9fba3924 | 48 | - Using IAR1700 board: LED1 is P1.25, LED2 is P0.4 |
| frank26080115 | 0:bf7b9fba3924 | 49 | |
| frank26080115 | 0:bf7b9fba3924 | 50 | @Directory contents: |
| frank26080115 | 0:bf7b9fba3924 | 51 | \EWARM: includes EWARM (IAR) project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 52 | \Keil: includes RVMDK (Keil)project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 53 | |
| frank26080115 | 0:bf7b9fba3924 | 54 | lpc17xx_libcfg.h: Library configuration file - include needed driver library for this example |
| frank26080115 | 0:bf7b9fba3924 | 55 | makefile: Example's makefile (to build with GNU toolchain) |
| frank26080115 | 0:bf7b9fba3924 | 56 | priviledge.c: Main program |
| frank26080115 | 0:bf7b9fba3924 | 57 | |
| frank26080115 | 0:bf7b9fba3924 | 58 | @How to run: |
| frank26080115 | 0:bf7b9fba3924 | 59 | Hardware configuration: |
| frank26080115 | 0:bf7b9fba3924 | 60 | This example was tested only on: |
| frank26080115 | 0:bf7b9fba3924 | 61 | Keil MCB1700 with LPC1768 vers.1 |
| frank26080115 | 0:bf7b9fba3924 | 62 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 63 | - VDDIO: ON |
| frank26080115 | 0:bf7b9fba3924 | 64 | - VDDREGS: ON |
| frank26080115 | 0:bf7b9fba3924 | 65 | - VBUS: ON |
| frank26080115 | 0:bf7b9fba3924 | 66 | - LED: ON |
| frank26080115 | 0:bf7b9fba3924 | 67 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 68 | IAR LPC1768 KickStart vers.A |
| frank26080115 | 0:bf7b9fba3924 | 69 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 70 | - PWR_SEL: depend on power source |
| frank26080115 | 0:bf7b9fba3924 | 71 | - DBG_EN : ON |
| frank26080115 | 0:bf7b9fba3924 | 72 | - ACC_IRQ/LED2: 2-3 (LED2) |
| frank26080115 | 0:bf7b9fba3924 | 73 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 74 | |
| frank26080115 | 0:bf7b9fba3924 | 75 | Serial display configuration:(e.g: TeraTerm, Hyperterminal, Flash Magic...) |
| frank26080115 | 0:bf7b9fba3924 | 76 | 115200bps |
| frank26080115 | 0:bf7b9fba3924 | 77 | 8 data bit |
| frank26080115 | 0:bf7b9fba3924 | 78 | No parity |
| frank26080115 | 0:bf7b9fba3924 | 79 | 1 stop bit |
| frank26080115 | 0:bf7b9fba3924 | 80 | No flow control |
| frank26080115 | 0:bf7b9fba3924 | 81 | |
| frank26080115 | 0:bf7b9fba3924 | 82 | Running mode: |
| frank26080115 | 0:bf7b9fba3924 | 83 | This example can run on RAM/ROM mode. |
| frank26080115 | 0:bf7b9fba3924 | 84 | |
| frank26080115 | 0:bf7b9fba3924 | 85 | Note: If want to burn hex file to board by using Flash Magic, these jumpers need |
| frank26080115 | 0:bf7b9fba3924 | 86 | to be connected: |
| frank26080115 | 0:bf7b9fba3924 | 87 | - MCB1700 with LPC1768 ver.1: |
| frank26080115 | 0:bf7b9fba3924 | 88 | + RST: ON |
| frank26080115 | 0:bf7b9fba3924 | 89 | + ISP: ON |
| frank26080115 | 0:bf7b9fba3924 | 90 | - IAR LPC1768 KickStart vers.A: |
| frank26080115 | 0:bf7b9fba3924 | 91 | + RST_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 92 | + ISP_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 93 | |
| frank26080115 | 0:bf7b9fba3924 | 94 | (Please reference "LPC1000 Software Development Toolchain" - chapter 4 "Creating and working with |
| frank26080115 | 0:bf7b9fba3924 | 95 | LPC1000CMSIS project" for more information) |
| frank26080115 | 0:bf7b9fba3924 | 96 | |
| frank26080115 | 0:bf7b9fba3924 | 97 | Step to run: |
| frank26080115 | 0:bf7b9fba3924 | 98 | - Step 1: Build example. |
| frank26080115 | 0:bf7b9fba3924 | 99 | - Step 2: Burn hex file into board (if run on ROM mode) |
| frank26080115 | 0:bf7b9fba3924 | 100 | - Step 3: Connect UART0 on this board to COM port on your computer |
| frank26080115 | 0:bf7b9fba3924 | 101 | - Step 4: Configure hardware and serial display as above instruction |
| frank26080115 | 0:bf7b9fba3924 | 102 | - Step 5: Run example and observe on serial display |
| frank26080115 | 0:bf7b9fba3924 | 103 | + Press '1' to change into unprivilege mode |
| frank26080115 | 0:bf7b9fba3924 | 104 | + Press '2' to switch back to privilege mode |
| frank26080115 | 0:bf7b9fba3924 | 105 | |
| frank26080115 | 0:bf7b9fba3924 | 106 | (Pls see "LPC17xx Example Description" document - chapter "Examples > Cortex-M3 > Privilege_mode" |
| frank26080115 | 0:bf7b9fba3924 | 107 | for more details) |
| frank26080115 | 0:bf7b9fba3924 | 108 | |
| frank26080115 | 0:bf7b9fba3924 | 109 | @Tip: |
| frank26080115 | 0:bf7b9fba3924 | 110 | - Open \EWARM\*.eww project file to run example on IAR |
| frank26080115 | 0:bf7b9fba3924 | 111 | - Open \RVMDK\*.uvproj project file to run example on Keil |