MAX3100, an external serial device to add additional serial ports via SPI
Dependents: FLIGHT_CONTROL_AND_COMMUNICATIONS_SYSTEM
example4.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_EXAMPLE4_COMPILE 00024 00025 /* 00026 * This is the same as example1.h but shows how to attach a usre defined callback 00027 * function that is called by the ISR. 00028 * 00029 * Connecting up the MAX3100 for this test program. Note, to form a "loopback" 00030 * the MAX3100 TX pin (13) is connected to the RX pin (12). Don't forget thwe Xtal 00031 * and power pins that are not shown here. Although I do PullUp mode on the IRQ pin 00032 * I still needed a real external pull up resistor on the IRQ line. You may need one 00033 * also. 00034 * ____________ 00035 * / \ 00036 * Mbed MOSI p5 |-----------------> 1| Din TX | 13 ------\ 00037 * MISO p6 |-----------------> 2| Dout | | 00038 * SCLK p7 |-----------------> 3| Sclk RX | 12 ------/ 00039 * p8 |-----------------> 4| CS | 00040 * p9 |-----------------> 5| IRQ | MAX3100 00041 * +5v ------> 6| SHTD | Xtal and PWR not shown. 00042 * \____________/ 00043 */ 00044 00045 #include "mbed.h" 00046 #include "MAX3100.h" 00047 00048 Serial pc(USBTX, USBRX); 00049 MAX3100 max(p5, p6, p7, p8, p9); 00050 00051 // Used to count RX interrupts. Must be declared as 00052 // volatile as it's used in MyIsrCallback() which is 00053 // in ISR context and main() which is user context. 00054 // See http://mbed.org/users/AjK/notebook/regarding-interrupts-use-and-blocking/ 00055 volatile int isrCounter; 00056 00057 // User function called when an IRQ from the MAX3100 is activated. 00058 void MyIsrCallback( int isrType ) { 00059 // Only count RX IRQs. 00060 if ( isrType & MAX3100::ISR_RX ) { 00061 isrCounter++; 00062 } 00063 } 00064 00065 int main() { 00066 00067 isrCounter = 0; 00068 00069 // Set the PC USB serial baud rate. 00070 pc.baud(115200); 00071 00072 max.attach_isr_user( MyIsrCallback ); 00073 00074 max.enableRxIrq(); 00075 max.enableTxIrq(); 00076 00077 max.printf("\nHello World.\n"); 00078 00079 // Any byte received on the "USB serial port" is sent to the MAX3100 device. 00080 // Any byte received by the MAX3100 device is sent to the "USB serial port". 00081 while (1) { 00082 if (pc.readable()) { 00083 int c = pc.getc(); 00084 max.putc(c); 00085 } 00086 00087 if ( isrCounter > 0 ) { 00088 pc.putc( max.getc() ); 00089 isrCounter--; 00090 } 00091 } 00092 } 00093 00094 #endif
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