Andy K / MAX3100

MAX3100, an external serial device to add additional serial ports via SPI

Dependents:   FLIGHT_CONTROL_AND_COMMUNICATIONS_SYSTEM

example2.h@2:2a49171453d5, 2012-08-03 (annotated)

Committer:
AjK
Date:
Fri Aug 03 12:28:27 2012 +0000
Revision:
2:2a49171453d5
Parent:
1:46c8c60e744a 
Add example4.h and ISR user callback code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 0:055897ab699b 1 /*
AjK 0:055897ab699b 2 Copyright (c) 2011 Andy Kirkham
AjK 0:055897ab699b 3
AjK 0:055897ab699b 4 Permission is hereby granted, free of charge, to any person obtaining a copy
AjK 0:055897ab699b 5 of this software and associated documentation files (the "Software"), to deal
AjK 0:055897ab699b 6 in the Software without restriction, including without limitation the rights
AjK 0:055897ab699b 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
AjK 0:055897ab699b 8 copies of the Software, and to permit persons to whom the Software is
AjK 0:055897ab699b 9 furnished to do so, subject to the following conditions:
AjK 0:055897ab699b 10
AjK 0:055897ab699b 11 The above copyright notice and this permission notice shall be included in
AjK 0:055897ab699b 12 all copies or substantial portions of the Software.
AjK 0:055897ab699b 13
AjK 0:055897ab699b 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
AjK 0:055897ab699b 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
AjK 0:055897ab699b 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AjK 0:055897ab699b 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
AjK 0:055897ab699b 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
AjK 0:055897ab699b 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
AjK 0:055897ab699b 20 THE SOFTWARE.
AjK 0:055897ab699b 21 */
AjK 0:055897ab699b 22
AjK 0:055897ab699b 23 #ifdef MAX3100_EXAMPLE_COMPILE
AjK 0:055897ab699b 24
AjK 0:055897ab699b 25 /*
AjK 0:055897ab699b 26 * Connecting up the MAX3100 for this test program. Note, to form a "loopback"
AjK 0:055897ab699b 27 * the MAX3100 TX pin (13) is connected to the RX pin (12). Don't forget thwe Xtal
AjK 0:055897ab699b 28 * and power pins that are not shown here. Although I do PullUp mode on the IRQ pin
AjK 0:055897ab699b 29 * I still needed a real external pull up resistor on the IRQ lines. You may need to
AjK 0:055897ab699b 30 * add two pullups to teh two interrupt lines at p9 and p11.
AjK 0:055897ab699b 31 * ____________
AjK 0:055897ab699b 32 * / \ U1
AjK 0:055897ab699b 33 * Mbed MOSI p5 |-------*---------------> 1| Din TX | 13 ------\
AjK 0:055897ab699b 34 * MISO p6 |-----*-|---------------> 2| Dout | |
AjK 0:055897ab699b 35 * SCLK p7 |---*-|-|---------------> 3| Sclk RX | 12 ------/
AjK 0:055897ab699b 36 * p8 |---|-|-|---------------> 4| CS |
AjK 0:055897ab699b 37 * p9 |---|-|-|---------------> 5| IRQ | MAX3100
AjK 0:055897ab699b 38 * | | | +5v ---> 6| SHTD | Xtal and PWR not shown.
AjK 0:055897ab699b 39 * | | | \____________/
AjK 0:055897ab699b 40 * | | | ____________
AjK 0:055897ab699b 41 * | | | / \ U2
AjK 0:055897ab699b 42 * | | \---------------> 1| Din TX | 13 ------\
AjK 0:055897ab699b 43 * | \-----------------> 2| Dout | |
AjK 0:055897ab699b 44 * \-------------------> 3| Sclk RX | 12 ------/
AjK 0:055897ab699b 45 * p10 |-----------------------> 4| CS |
AjK 0:055897ab699b 46 * p11 |-----------------------> 5| IRQ | MAX3100
AjK 0:055897ab699b 47 * +5v ---> 6| SHTD | Xtal and PWR not shown.
AjK 0:055897ab699b 48 * \____________/
AjK 0:055897ab699b 49 *
AjK 0:055897ab699b 50 * This example shows two MAX3100 sharing a single SPI bus. Each device, however,
AjK 0:055897ab699b 51 * still has it's own CS and IRQ signals.
AjK 0:055897ab699b 52 */
AjK 0:055897ab699b 53
AjK 0:055897ab699b 54 #include "mbed.h"
AjK 0:055897ab699b 55 #include "MAX3100.h"
AjK 0:055897ab699b 56
AjK 0:055897ab699b 57 Serial pc(USBTX, USBRX);
AjK 0:055897ab699b 58 SPI spi(p5, p6, p7);
AjK 0:055897ab699b 59 MAX3100 *max1;
AjK 0:055897ab699b 60 MAX3100 *max2;
AjK 0:055897ab699b 61
AjK 0:055897ab699b 62 int main() {
AjK 0:055897ab699b 63
AjK 0:055897ab699b 64 // Set the PC USB serial baud rate.
AjK 0:055897ab699b 65 pc.baud(115200);
AjK 0:055897ab699b 66
AjK 0:055897ab699b 67 // Format the SPI interface.
AjK 0:055897ab699b 68 spi.format(16, 0);
AjK 0:055897ab699b 69 spi.frequency(MAX3100_SPI_FREQ);
AjK 0:055897ab699b 70
AjK 0:055897ab699b 71 // Create the two MAX3100 objects which share the SPI bus.
AjK 0:055897ab699b 72 max1 = new MAX3100(&spi, p8, p9);
AjK 0:055897ab699b 73 max2 = new MAX3100(&spi, p10, p11);
AjK 0:055897ab699b 74
AjK 0:055897ab699b 75 // Enable the interrupts.
AjK 0:055897ab699b 76 max1->enableRxIrq();
AjK 0:055897ab699b 77 max1->enableTxIrq();
AjK 0:055897ab699b 78 max2->enableRxIrq();
AjK 0:055897ab699b 79 max2->enableTxIrq();
AjK 0:055897ab699b 80
AjK 0:055897ab699b 81 max1->printf("\nHello World.\n");
AjK 1:46c8c60e744a 82 //max2->printf("\nHello World.\n");
AjK 0:055897ab699b 83
AjK 0:055897ab699b 84 // Any byte received on the "USB serial port" is sent to both MAX3100 devices.
AjK 0:055897ab699b 85 // Any byte received by a MAX3100 device is sent to the "USB serial port".
AjK 0:055897ab699b 86 while (1) {
AjK 0:055897ab699b 87 if (pc.readable()) {
AjK 0:055897ab699b 88 int c = pc.getc();
AjK 1:46c8c60e744a 89 max1->putc(c);
AjK 0:055897ab699b 90 max2->putc(c);
AjK 0:055897ab699b 91 }
AjK 0:055897ab699b 92 if (max1->readable()) {
AjK 0:055897ab699b 93 pc.putc( max1->getc() );
AjK 0:055897ab699b 94 }
AjK 0:055897ab699b 95 if (max2->readable()) {
AjK 0:055897ab699b 96 pc.putc( max2->getc() );
AjK 0:055897ab699b 97 }
AjK 0:055897ab699b 98 }
AjK 0:055897ab699b 99 }
AjK 0:055897ab699b 100
AjK 0:055897ab699b 101 #endif