uint8_t W5100Class::init(void)
{
static bool initialized = false;
uint8_t i;
if (initialized) return 1;
// Many Ethernet shields have a CAT811 or similar reset chip
// connected to W5100 or W5200 chips. The W5200 will not work at
// all, and may even drive its MISO pin, until given an active low
// reset pulse! The CAT811 has a 240 ms typical pulse length, and
// a 400 ms worst case maximum pulse length. MAX811 has a worst
// case maximum 560 ms pulse length. This delay is meant to wait
// until the reset pulse is ended. If your hardware has a shorter
// reset time, this can be edited or removed.
delay(560);
//Serial.println("w5100 init");
SPI.begin();
initSS();
resetSS();
SPI.beginTransaction(SPI_ETHERNET_SETTINGS);
// Attempt W5200 detection first, because W5200 does not properly
// reset its SPI state when CS goes high (inactive). Communication
// from detecting the other chips can leave the W5200 in a state
// where it won't recover, unless given a reset pulse.
if (isW5200()) {
CH_BASE_MSB = 0x40;
#ifdef ETHERNET_LARGE_BUFFERS
#if MAX_SOCK_NUM <= 1
SSIZE = 16384;
#elif MAX_SOCK_NUM <= 2
SSIZE = 8192;
#elif MAX_SOCK_NUM <= 4
SSIZE = 4096;
#else
SSIZE = 2048;
#endif
SMASK = SSIZE - 1;
#endif
for (i=0; i<MAX_SOCK_NUM; i++) {
writeSnRX_SIZE(i, SSIZE >> 10);
writeSnTX_SIZE(i, SSIZE >> 10);
}
for (; i<8; i++) {
writeSnRX_SIZE(i, 0);
writeSnTX_SIZE(i, 0);
}
// Try W5500 next. Wiznet finally seems to have implemented
// SPI well with this chip. It appears to be very resilient,
// so try it after the fragile W5200
} else if (isW5500()) {
uint8_t W5100Class::init(void)
{
uint16_t TXBUF_BASE, RXBUF_BASE;
uint8_t i;
delay(200);
//Serial.println("w5100 init");
#ifdef USE_SPIFIFO
SPIFIFO.begin(W5200_SS_PIN, SPI_CLOCK_12MHz); // W5100 is 14 MHz max
#else
SPI.begin();
SPI.setClockDivider(SPI_CLOCK_DIV2);
initSS();
#endif
if (isW5100()) {
CH_BASE = 0x0400;
SSIZE = 2048;
SMASK = 0x07FF;
TXBUF_BASE = 0x4000;
RXBUF_BASE = 0x6000;
writeTMSR(0x55);
writeRMSR(0x55);
} else if (isW5200()) {
#ifdef USE_SPIFIFO
//SPIFIFO.begin(W5200_SS_PIN, SPI_CLOCK_24MHz); // W5200 is 33 MHz max
#endif
CH_BASE = 0x4000;
SSIZE = 4096;
SMASK = 0x0FFF;
TXBUF_BASE = 0x8000;
RXBUF_BASE = 0xC000;
for (i=0; i<MAX_SOCK_NUM; i++) {
writeSnRX_SIZE(i, SSIZE >> 10);
writeSnTX_SIZE(i, SSIZE >> 10);
}
for (; i<8; i++) {
writeSnRX_SIZE(i, 0);
writeSnTX_SIZE(i, 0);
}
} else {
