example2.h

00001 /*
00002     Copyright (c) 2011 Andy Kirkham
00003  
00004     Permission is hereby granted, free of charge, to any person obtaining a copy
00005     of this software and associated documentation files (the "Software"), to deal
00006     in the Software without restriction, including without limitation the rights
00007     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008     copies of the Software, and to permit persons to whom the Software is
00009     furnished to do so, subject to the following conditions:
00010  
00011     The above copyright notice and this permission notice shall be included in
00012     all copies or substantial portions of the Software.
00013  
00014     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017     AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020     THE SOFTWARE.
00021 */
00022 
00023 #ifdef MAX3100_EXAMPLE_COMPILE
00024 
00025 /*
00026  * Connecting up the MAX3100 for this test program. Note, to form a "loopback"
00027  * the MAX3100 TX pin (13) is connected to the RX pin (12). Don't forget thwe Xtal
00028  * and power pins that are not shown here. Although I do PullUp mode on the IRQ pin
00029  * I still needed a real external pull up resistor on the IRQ lines. You may need to
00030  * add two pullups to teh two interrupt lines at p9 and p11.
00031  *                                          ____________
00032  *                                         /            \ U1
00033  * Mbed MOSI p5 |-------*---------------> 1| Din     TX | 13 ------\
00034  *      MISO p6 |-----*-|---------------> 2| Dout       |          |
00035  *      SCLK p7 |---*-|-|---------------> 3| Sclk    RX | 12 ------/
00036  *           p8 |---|-|-|---------------> 4| CS         |
00037  *           p9 |---|-|-|---------------> 5| IRQ        | MAX3100 
00038  *                  | | |        +5v ---> 6| SHTD       | Xtal and PWR not shown.
00039  *                  | | |                  \____________/
00040  *                  | | |                   ____________
00041  *                  | | |                  /            \ U2
00042  *                  | | \---------------> 1| Din     TX | 13 ------\
00043  *                  | \-----------------> 2| Dout       |          |
00044  *                  \-------------------> 3| Sclk    RX | 12 ------/
00045  *          p10 |-----------------------> 4| CS         |
00046  *          p11 |-----------------------> 5| IRQ        | MAX3100
00047  *                               +5v ---> 6| SHTD       | Xtal and PWR not shown.
00048  *                                         \____________/
00049  *
00050  * This example shows two MAX3100 sharing a single SPI bus. Each device, however, 
00051  * still has it's own CS and IRQ signals.
00052  */
00053 
00054 #include "mbed.h"
00055 #include "MAX3100.h"
00056 
00057 Serial  pc(USBTX, USBRX);
00058 SPI     spi(p5, p6, p7);
00059 MAX3100 *max1;
00060 MAX3100 *max2;
00061 
00062 int main() {
00063         
00064     // Set the PC USB serial baud rate.
00065     pc.baud(115200);
00066 
00067     // Format the SPI interface.    
00068     spi.format(16, 0);
00069     spi.frequency(MAX3100_SPI_FREQ);
00070     
00071     // Create the two MAX3100 objects which share the SPI bus.
00072     max1 = new MAX3100(&spi, p8, p9);
00073     max2 = new MAX3100(&spi, p10, p11);
00074     
00075     // Enable the interrupts.
00076     max1->enableRxIrq();
00077     max1->enableTxIrq();
00078     max2->enableRxIrq();
00079     max2->enableTxIrq();
00080     
00081     max1->printf("\nHello World.\n");
00082     //max2->printf("\nHello World.\n");
00083     
00084     // Any byte received on the "USB serial port" is sent to both MAX3100 devices.
00085     // Any byte received by a MAX3100 device is sent to the "USB serial port".
00086     while (1) {
00087         if (pc.readable()) {
00088             int c = pc.getc();
00089             max1->putc(c);
00090             max2->putc(c);            
00091         }
00092         if (max1->readable()) {
00093             pc.putc( max1->getc() );
00094         }
00095         if (max2->readable()) {
00096             pc.putc( max2->getc() );
00097         }
00098     }    
00099 }
00100 
00101 #endif