/* * Copyright(C) Paul und Scherer (mct.de/mct.net) * * This example demonstrates how to... * * ... use the ethernet device in loopback mode * (DAC channel 0 is tied to ADC channel 0). */ #include #include #include #include "net.h" #include "../delay.h" #define SN (255L<<24|255L<<16|255L<<8|192) // choose subnet mask #define GW (194L<<24| 64L<<16|159L<<8| 65) // gateway addr #define IP (194L<<24| 64L<<16|159L<<8| 79) // IP addr #define PN 80 // port number (http) /* * The ethernet device channel 0 is initialized in TCP server mode. * * On connect, form data gets updated if present, and the html page * gets built and sent. After sending data, the channel gets closed * until the next connection is made. * * Connect the DAC0 output to ADC0. DAC0 and ADC0 values should not * differ significantly. Note, that DAC0 is the pin labelled ADC12. */ int main(void) { /* * Reference voltage * * Setting refcon to 1 activates the internal * reference and connects it to the Vref pin. * * Note: A 0.47uF capacitor is required (from * Vref to GND) for proper operation! */ Intern_refcon = 1; Intern_dac0con = 0x12; // DAC range 0 to Vref Intern_adccon = 0xa4; // ADC continuous conversion /* * Initialize bus interface. */ Intern_gp0con = 0x00000220; Intern_gp1con = 0x02222211; Intern_gp2con = 0x22222220; Intern_gp3con = 0x22222222; Intern_gp4con = 0x22222222; Intern_xmcfg = 1; Intern_xm0con = 3; Intern_xm1con = 3; Intern_xm2con = 3; Intern_xm3con = 1; Intern_xm0par = 0x722; Intern_xm1par = 0x722; Intern_xm2par = 0x722; Intern_xm3par = 0x722; puts("Bus interface initialized."); net_init(SN, GW, IP); // initialize NET device printf("\n" "NET7026 TCP server\n" "==================\n\n" " Subnet mask : %3d.%3d.%3d.%3d\n" " Gateway address : %3d.%3d.%3d.%3d\n" " IP address : %3d.%3d.%3d.%3d\n", net_rh(NET_SUBR), net_rb(NET_SUBR), net_rh(NET_SUBR+2), net_rb(NET_SUBR+2), net_rh(NET_GAR ), net_rb(NET_GAR ), net_rh(NET_GAR +2), net_rb(NET_GAR +2), net_rh(NET_SIPR), net_rb(NET_SIPR), net_rh(NET_SIPR+2), net_rb(NET_SIPR+2) ); while (1) { static char pbuf[1000]; // html page buffer static char req [100]; // request buffer unsigned long dac; // DAC data net_open(PN, 0); // initialize socket (listen) printf("\nDisconnected, waiting for connection (port #%d)...\n", net_rw(NET_S0_PORTR)); while (net_rb(NET_S0_SSR) != NET_SE) ; // wait for sock_established printf("Connected (%3d.%3d.%3d.%3d), ", net_rh(NET_S0_DIPR ), net_rb(NET_S0_DIPR ), net_rh(NET_S0_DIPR+2), net_rb(NET_S0_DIPR+2) ); /* * Check for form data update. * Invalid DAC data is zeroed. */ memset(req, 0, sizeof(req)); net_read(req, sizeof(req)-1); if (strstr(req, "GET /?")) { char *p; if ((p = strstr(req, "HTTP/"))) *p = 0; fputs("updating, ", stdout); if ((p = strstr(req, "dac="))) { if (sscanf(p+4, "%lu", &dac) != 1 || dac > 4095) dac = 0; Intern_dac0dat = dac<<16, delay(1); } } while (!Intern_adcsta) ; // wait for ADC result ready /* * Build the html page to be sent. */ sprintf(pbuf, "HTTP/1.1 200 OK\n\n" // GET response header "" "" "NET7026 Loopback" "" "" "

NET7026 Loopback

" "

DAC0 -> ADC0

" "" "

mct.de
" " mct.net

" "" "", dac, (Intern_adcdat>>16)&0xfff ); puts("sending page..."); net_write(pbuf, strlen(pbuf)); net_close(); } }