Frank 26080115
These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
I2S/I2S_MCLK/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 I2S\I2S_MCLK\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 I2S MCLK 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 use I2S master clock as I2S clock source |
| frank26080115 | 0:bf7b9fba3924 | 23 | Process: |
| frank26080115 | 0:bf7b9fba3924 | 24 | I2S setup: |
| frank26080115 | 0:bf7b9fba3924 | 25 | - wordwidth: 16 bits |
| frank26080115 | 0:bf7b9fba3924 | 26 | - stereo mode |
| frank26080115 | 0:bf7b9fba3924 | 27 | - master mode for TX and slave mode for RX |
| frank26080115 | 0:bf7b9fba3924 | 28 | - ws_haftword = 31 |
| frank26080115 | 0:bf7b9fba3924 | 29 | - frequency = 44.1Khz (maximum is 96kHz) |
| frank26080115 | 0:bf7b9fba3924 | 30 | I2S Clock setting: |
| frank26080115 | 0:bf7b9fba3924 | 31 | - Transmitter: |
| frank26080115 | 0:bf7b9fba3924 | 32 | + Select the RX fractional rate divider clock ouput as the source |
| frank26080115 | 0:bf7b9fba3924 | 33 | + Disable 4-wire mode |
| frank26080115 | 0:bf7b9fba3924 | 34 | + Enable TX_MCLK output (this setting is optional, just used to observe |
| frank26080115 | 0:bf7b9fba3924 | 35 | this clock on oscilloscope) |
| frank26080115 | 0:bf7b9fba3924 | 36 | - Receiver: |
| frank26080115 | 0:bf7b9fba3924 | 37 | + Select the TX_MCLK signal as RX_MCLK clock source |
| frank26080115 | 0:bf7b9fba3924 | 38 | + Disable 4-wire mode |
| frank26080115 | 0:bf7b9fba3924 | 39 | + Disable RX_MCLK output |
| frank26080115 | 0:bf7b9fba3924 | 40 | Clock calculate formula: |
| frank26080115 | 0:bf7b9fba3924 | 41 | MCLK = I2S_freq * (bitrate + 1) |
| frank26080115 | 0:bf7b9fba3924 | 42 | bitrate = channel * wordwidth - 1 |
| frank26080115 | 0:bf7b9fba3924 | 43 | Ex: a 48 kHz sample rate for 16-bit stereo data will have master clock: |
| frank26080115 | 0:bf7b9fba3924 | 44 | MCLK = 48K * 16 * 2 = 1.536Mhz |
| frank26080115 | 0:bf7b9fba3924 | 45 | |
| frank26080115 | 0:bf7b9fba3924 | 46 | This example sets I2S receiver use MCLK from I2S transmitter. So we not must have to connect wire |
| frank26080115 | 0:bf7b9fba3924 | 47 | between I2SRX_CLK and I2STX_CLK. |
| frank26080115 | 0:bf7b9fba3924 | 48 | I2S transmit data in interrupt mode. After finished, received and transmited buffer will be verified, |
| frank26080115 | 0:bf7b9fba3924 | 49 | the result will be print out serial display. |
| frank26080115 | 0:bf7b9fba3924 | 50 | |
| frank26080115 | 0:bf7b9fba3924 | 51 | Pls note that because I2S is the protocol for audio data transfer, so sometime it has dummy data |
| frank26080115 | 0:bf7b9fba3924 | 52 | while FIFO transmit is empty. These data are not importance and they can be ignored when verify. |
| frank26080115 | 0:bf7b9fba3924 | 53 | |
| frank26080115 | 0:bf7b9fba3924 | 54 | @Directory contents: |
| frank26080115 | 0:bf7b9fba3924 | 55 | \EWARM: includes EWARM (IAR) project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 56 | \Keil: includes RVMDK (Keil)project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 57 | |
| frank26080115 | 0:bf7b9fba3924 | 58 | lpc17xx_libcfg.h: Library configuration file - include needed driver library for this example |
| frank26080115 | 0:bf7b9fba3924 | 59 | makefile: Example's makefile (to build with GNU toolchain) |
| frank26080115 | 0:bf7b9fba3924 | 60 | i2s_mclk.c: Main program |
| frank26080115 | 0:bf7b9fba3924 | 61 | |
| frank26080115 | 0:bf7b9fba3924 | 62 | @How to run: |
| frank26080115 | 0:bf7b9fba3924 | 63 | Hardware configuration: |
| frank26080115 | 0:bf7b9fba3924 | 64 | This example was tested on: |
| frank26080115 | 0:bf7b9fba3924 | 65 | Keil MCB1700 with LPC1768 vers.1 |
| frank26080115 | 0:bf7b9fba3924 | 66 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 67 | - VDDIO: ON |
| frank26080115 | 0:bf7b9fba3924 | 68 | - VDDREGS: ON |
| frank26080115 | 0:bf7b9fba3924 | 69 | - VBUS: ON |
| frank26080115 | 0:bf7b9fba3924 | 70 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 71 | IAR LPC1768 KickStart vers.A |
| frank26080115 | 0:bf7b9fba3924 | 72 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 73 | - PWR_SEL: depend on power source |
| frank26080115 | 0:bf7b9fba3924 | 74 | - DBG_EN : ON |
| frank26080115 | 0:bf7b9fba3924 | 75 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 76 | |
| frank26080115 | 0:bf7b9fba3924 | 77 | I2S connection (uses MCLK share inside): |
| frank26080115 | 0:bf7b9fba3924 | 78 | I2S-RX connects to I2S-TX as following: |
| frank26080115 | 0:bf7b9fba3924 | 79 | - P0.5-I2SRX_WS connects to P0.8-I2STX_WS |
| frank26080115 | 0:bf7b9fba3924 | 80 | - P0.6-I2SRX_SDA connects to p0.9-I2STX_SDA |
| frank26080115 | 0:bf7b9fba3924 | 81 | |
| frank26080115 | 0:bf7b9fba3924 | 82 | Serial display configuration:(e.g: , TeraTerm, Hyperterminal, Flash Magic...) |
| frank26080115 | 0:bf7b9fba3924 | 83 | 115200bps |
| frank26080115 | 0:bf7b9fba3924 | 84 | 8 data bit |
| frank26080115 | 0:bf7b9fba3924 | 85 | No parity |
| frank26080115 | 0:bf7b9fba3924 | 86 | 1 stop bit |
| frank26080115 | 0:bf7b9fba3924 | 87 | No flow control |
| frank26080115 | 0:bf7b9fba3924 | 88 | |
| frank26080115 | 0:bf7b9fba3924 | 89 | Running mode: |
| frank26080115 | 0:bf7b9fba3924 | 90 | This example can run on RAM/ROM mode. |
| frank26080115 | 0:bf7b9fba3924 | 91 | |
| frank26080115 | 0:bf7b9fba3924 | 92 | Note: If want to burn hex file to board by using Flash Magic, these jumpers need |
| frank26080115 | 0:bf7b9fba3924 | 93 | to be connected: |
| frank26080115 | 0:bf7b9fba3924 | 94 | - MCB1700 with LPC1768 ver.1: |
| frank26080115 | 0:bf7b9fba3924 | 95 | + RST: ON |
| frank26080115 | 0:bf7b9fba3924 | 96 | + ISP: ON |
| frank26080115 | 0:bf7b9fba3924 | 97 | - IAR LPC1768 KickStart vers.A: |
| frank26080115 | 0:bf7b9fba3924 | 98 | + RST_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 99 | + ISP_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 100 | |
| frank26080115 | 0:bf7b9fba3924 | 101 | (Please reference "LPC1000 Software Development Toolchain" - chapter 4 "Creating and working with |
| frank26080115 | 0:bf7b9fba3924 | 102 | LPC1000CMSIS project" for more information) |
| frank26080115 | 0:bf7b9fba3924 | 103 | |
| frank26080115 | 0:bf7b9fba3924 | 104 | Step to run: |
| frank26080115 | 0:bf7b9fba3924 | 105 | - Step 1: Build example. |
| frank26080115 | 0:bf7b9fba3924 | 106 | - Step 2: Burn hex file into board (if run on ROM mode) |
| frank26080115 | 0:bf7b9fba3924 | 107 | - Step 3: Connect UART0 on this board to COM port on your computer |
| frank26080115 | 0:bf7b9fba3924 | 108 | - Step 4: Configure hardware and serial display as above instruction |
| frank26080115 | 0:bf7b9fba3924 | 109 | - Step 5: Run example, observe data on serial display |
| frank26080115 | 0:bf7b9fba3924 | 110 | |
| frank26080115 | 0:bf7b9fba3924 | 111 | (Pls see "LPC17xx Example Description" document - chapter "Examples > I2S > I2S_MCLK" |
| frank26080115 | 0:bf7b9fba3924 | 112 | for more details) |
| frank26080115 | 0:bf7b9fba3924 | 113 | |
| frank26080115 | 0:bf7b9fba3924 | 114 | @Tip: |
| frank26080115 | 0:bf7b9fba3924 | 115 | - Open \EWARM\*.eww project file to run example on IAR |
| frank26080115 | 0:bf7b9fba3924 | 116 | - Open \RVMDK\*.uvproj project file to run example on Keil |