/* interrupt service routine */
void rt_dm9000_isr()
{
rt_uint16_t int_status;
rt_uint16_t last_io;
last_io = DM9000_IO;
/* Disable all interrupts */
// dm9000_io_write(DM9000_IMR, IMR_PAR);
/* Got DM9000 interrupt status */
int_status = dm9000_io_read(DM9000_ISR); /* Got ISR */
dm9000_io_write(DM9000_ISR, int_status); /* Clear ISR status */
DM9000_TRACE("dm9000 isr: int status %04x\n", int_status);
/* receive overflow */
if (int_status & ISR_ROS)
{
rt_kprintf("overflow\n");
}
if (int_status & ISR_ROOS)
{
rt_kprintf("overflow counter overflow\n");
}
/* Received the coming packet */
if (int_status & ISR_PRS)
{
/* disable receive interrupt */
dm9000_io_write(DM9000_IMR, IMR_PAR);
dm9000_device.imr_all = IMR_PAR | IMR_PTM;
dm9000_io_write(DM9000_IMR, dm9000_device.imr_all);
/* a frame has been received */
eth_device_ready(&(dm9000_device.parent));
}
/* Transmit Interrupt check */
if (int_status & ISR_PTS)
{
/* transmit done */
int tx_status = dm9000_io_read(DM9000_NSR); /* Got TX status */
if (tx_status & (NSR_TX2END | NSR_TX1END))
{
dm9000_device.packet_cnt --;
if (dm9000_device.packet_cnt > 0)
{
DM9000_TRACE("dm9000 isr: tx second packet\n");
/* transmit packet II */
/* Set TX length to DM9000 */
dm9000_io_write(DM9000_TXPLL, dm9000_device.queue_packet_len & 0xff);
dm9000_io_write(DM9000_TXPLH, (dm9000_device.queue_packet_len >> 8) & 0xff);
/* Issue TX polling command */
dm9000_io_write(DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
}
/* Read a word from phyxcer */
rt_inline rt_uint16_t phy_read(rt_uint16_t reg)
{
rt_uint16_t val;
/* Fill the phyxcer register into REG_0C */
dm9000_io_write(DM9000_EPAR, DM9000_PHY | reg);
dm9000_io_write(DM9000_EPCR, 0xc); /* Issue phyxcer read command */
delay_ms(100); /* Wait read complete */
dm9000_io_write(DM9000_EPCR, 0x0); /* Clear phyxcer read command */
val = (dm9000_io_read(DM9000_EPDRH) << 8) | dm9000_io_read(DM9000_EPDRL);
return val;
}
