/***********************************************************************
* $Id$ abstract.txt 2011-06-02
* @file SSP\Ssp_Dma\abstract.txt
* @brief Description of the SSP DMA example.
* @version 1.0
* @date 02. June. 2011
* @author NXP MCU SW Application Team
*
* Copyright(C) 2011, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.
**********************************************************************/
@Example description:
Purpose:
This example describes how to use SSP peripheral with DMA support.
Process:
SSP configuration:
- CPHA = 0: data is sampled on the first clock edge of SCK.
- CPOL = 0: SCK is active high
- Clock rate = 1MHz
- DSS = 8: 8 bits per transfer
- MSTR = 1: SSP operates in Master mode
- FRF= 0: SPI Frame format
This example uses SSP function in MASTER mode with Loop-back mode (MOSI MISO).
Transfer a number of data byte (in DMA mode for both Tx and Rx channel).
GPDMA channel 0 and 1 are used in this example.
GPDMA channel 0 is used to transfer data from source buffer to SSP peripheral.
Channel 1 is used to transfer data from SSP peripheral to destination buffer.
After transmittion completed, two buffers will be compared, if they are not similar,
the program will enter infinite loop and print error notice to serial display.
@Directory contents:
\Keil: includes RVMDK (Keil)project and configuration files
\EWARM: includes EWARM (IAR) project and configuration files
Ssp_Dma.c: Main program
@How to run:
Hardware configuration:
TThis example was tested on:
1. LPC1788 OEM Board rev A and OEM Base Board rev A
2. LPC1788 IAR Start Kit Rev.B
- 3.3VA_E :ON
- VREG :ON
- IO_E :ON
- PWR_SEL :depends on power source selection
(Choose correct working board by setting "_CURR_USING_BRD" marco in .\BoardSupport\bsp.h file)
SSP Connection:
SSP0: SSP0_MISO(P0.17) connects with SSP0_MOSI(P0.18)
SSP1: SSP1_MISO(P0.8) connects with SSP1_MOSI(P0.9)
Pin Map:
PA brd IAR brd
- P0.17: SSP0_MISO J5.20
- P0.18: SSP0_MOSI J3.23
- P0.8: SSP1_MISO J3.19 EXT-8
- P0.9: SSP1_MOSI J5.18 EXT-9
Serial display configuration: (e.g: TeraTerm, Hyperterminal, Flash Magic...)
1. LPC1788 OEM Board rev A and OEM Base Board rev A
- UART0: USB serial port
+ All jumpers: Default
- UART1:
+ P0.15 (@ J5.19) - JP12.2
+ P0.16 (@ J3.24) - JP13.2
- UART2:
+ JP6: 1-2: OFF
3-4: OFF
5-6: ON
+ JP12: 1-2
+ JP13: 1-2
+ Other jumpers: Default
- UART3:
+ P0.2 (@J5.13) - JP12.2
+ P0.3 (@J5.14) - JP13.2
- UART4:
+ P0.22 (@J3.25) - JP12.2
+ P2.9 (@J3.15) - JP13.2
2. LPC1788 IAR Start Kit Rev.B
- UART0:
All jumpers: optional
Note: Pls sure that "USED_UART_DEBUG_PORT" macro in debug_frmwrk.h is set correctly
Setting:
+ 115200bps
+ 8 data bit
+ No parity
+ 1 stop bit
+ No flow control
Running mode:
This example can run on RAM/ROM mode.
Note: If want to burn hex file to board by using Flash Magic, these jumpers need
to be connected:
1. LPC1788 OEM Board rev A and OEM Base Board rev A
- JP20: 1-2: ON
3-4: ON
(Using UART0 on USB serial port
Sure that you choose correct COM port number - Pls reference at:
"Device Manager" -> "Ports(COM & LPT)" -> "USB Serial Port (COMx)")
2. LPC1788 IAR Start Kit Rev.B
- RST_E: ON
- ISP_E: ON
Step to run:
- Step 1: Build example.
- Step 2: Burn hex file into board (if run on ROM mode)
- Step 3: Connect UART0\1\2 on this board to COM port on your computer
- Step 4: Configure hardware and serial display as above instruction
- Step 5: Run example, observe SSP transfer result on serial display
