/******************************************************************************* ** max3100.c *******************************************************************************/ // Thomas P. Sullivan // Enertech Consultants // 11-18-98 // This software demonstrates using the Maxim 3100 UART with the QSPI of the 68338 // found on the Persistor Instruments Inc. CF1. The software is provided for demonstration // purposes ONLY and no warranties are expressed or implied. The software is provide AS IS. // Having said that, I hope you find it useful. // The hardware needed to support this application is a CF1 and it's prototyping board. // Also, wired to the prototyping board are two MAX3100 UARTS (I used DIPS). Each is connected // to all the QSPI connections (i.e. MISO,MOSI,SCK). For the chip selects, one MAX3100 is connected to // PCS0 (and we'll call it Port 0) and the other is connected to PCS1 (and we'll call it Port 1). // The -IRQ line from both MAX3100's is connected to the -IRQ2 line on the CF1 and pulled up // to VREG through a 1 megOhm resistor. The -SHDN line from both MAX3100's is connected to the // CF1 pin CTS14A (if you need this pin then change it to another). The -SHDN line from // the MAX3100's can also be simply pulled-up if you do not need any control over this signal. // The crystal frequency used for the MAX3100's is 3.6864 MHz. A slower crystal can also be // used. If a slower crystal is used then the configuration word will have to be modified. // For this application using a 3.6864 MHz crystal, the baud rate for both parts is set at // 9600 (8N1). To use this software, wire the board as described and connect TX from one // MAX3100 to the RX of the other (2 jumpers). THIS IS JUST FOR TESTING USING THIS SOFTWARE. // The output of the MAX3100 is a digital signal. To change these signal to and from RS-232 // levels, use a chip like the MAX3223 (the MAX3100 is JUST A UART). // Compile, load and run this software. The software sends a byte to port 1 using port 0 and // sends a different byte to port 0 using port 1 (they play catch). The software supports interrupt // driven buffered receive and polled transmit. // // This schematic is probably viewed best with a fixed font. // // // // +------+-+------+ // 1| | | |14 // MOSI ---------------*------------+ Din - Vcc +---- VREG // | 2| |13 // MISO ------------*--[------------+ Dout Tx +-----------------------+ // | | 3| |12 | // SCK ---------*--[--[------------+ SCLK Rx +--------------------+ | // | | | 4| |11 | | // PCS0 ---------[--[--[------------+ -CS -RTS + | | // | | | 5| |10 | | // -IRQ2 ------*--[--[--[------------+ -IRQ -CTS +----- VREG | | // | | | | 6| |9 22pf | | // | | | | *---------+ -SHDN X1 +-----+-----||--+ | | // | | | | | 7| |8 ### | | | // | | | | | +-----+ GND X2 +-----+-----||--+ | | // | | | | | | | | Crystal 22pf| | | // | | | | | | +---------------+ 3.6864 | | | // | | | | | GND MAX3100 MHz GND | | // | | | | | | | // | | | | | | | // | | | | | | | // | | | | | +------+-+------+ | | // | | | | | 1| | | |14 | | // | | | +--[---------+ Din - Vcc +---- VREG | | // | | | | 2| |13 | | // | | +-----[---------+ Dout Tx +--------------------+ | // | | | 3| |12 | // | *--------[---------+ SCLK Rx +-----------------------+ // | | 4| |11 // PCS1 ------[-----------[---------+ -CS -RTS + // | | 5| |10 // +--*-----------[---------+ -IRQ -CTS +----- VREG // | | 6| |9 22pf // / +--+---------+ -SHDN X1 +-----+-----||--+ // \ | 7| |8 ### | // / / +-----+ GND X2 +-----+-----||--+ // 1 MEG \ \ | | | Crystal 22pf| // / / | +---------------+ 3.6864 | // \ \ GND MAX3100 MHz GND // | / // VREG ---+ \ // | // VREG ---+ #include // Persistor CF1 System and I/O Definitions #include // Persistor CF1 PicoDOS Definitions #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "Scan.h" // Global variables (well, global in scope right John!?) static QPB *QPB_Slot0 = NULL; //NULL to start static QPB *QPB_Slot1 = NULL; //NULL to start ushort ReadData = 0x0000; ushort ReadConfig = 0x4000; ushort Config = 0xC40B; //Just receive interupts on ushort ConfigTRIntON = 0xCC0B; //Receive AND transmit interupts on ushort WriteData; int GnMoreToSend0; int GnMoreToSend1; unsigned char *TopOfRecBuffer0, *HeadRecBuffer0, *TailRecBuffer0; unsigned char *TopOfRecBuffer1, *HeadRecBuffer1, *TailRecBuffer1; unsigned char *TopOfXmitBuffer0, *PtrXmitBuffer0; unsigned char *TopOfXmitBuffer1, *PtrXmitBuffer1; // Lets create a device driver specification for our part static QPBDev Max3100DevStruct0 = { COM2_SLOT, // qslot our qspi slot (non-multiplexed connection to PCS0 -- tps) "Max3100_0\0", // devName C string with device name (15 max) 42500000, // maxBaud maximum baud rate in Hz for device 16, // bits Bits Per Transfer iaLowSCK, // clockPolar SPI Clock Polarity (iaHighSCK,iaLowSCK) captLead, // clockPhase SPI Clock Phase (captLead/captFall) true, // contCSMulti Continue CS assert between mult xfrs true, // autoTiming Auto adjust timing to clock flag 0, // psDelaySCK Min. Delay Before SCK (picoSecs) 0, // psDelayTXFR Min. Delay After Transfer 0, // *rcvData pointer to received data buffer 0 // xfrCount words transferred }; static QPBDev Max3100DevStruct1 = { COM3_SLOT, // qslot our qspi slot (non-multiplexed connection to PCS0 -- tps) "Max3100_1\0", // devName C string with device name (15 max) 42500000, // maxBaud maximum baud rate in Hz for device 16, // bits Bits Per Transfer iaLowSCK, // clockPolar SPI Clock Polarity (iaHighSCK,iaLowSCK) captLead, // clockPhase SPI Clock Phase (captLead/captFall) true, // contCSMulti Continue CS assert between mult xfrs true, // autoTiming Auto adjust timing to clock flag 0, // psDelaySCK Min. Delay Before SCK (picoSecs) 0, // psDelayTXFR Min. Delay After Transfer 0, // *rcvData pointer to received data buffer 0 // xfrCount words transferred };