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udp.c
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udp.c
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#include "udp.h"
#include "system.h"
#if FCS_DMA_EN
#include "hardware/dma.h"
#endif
// Manchester table
// input 8bit, output 32bit, LSB first
// b00 -> IDLE
// b01 -> LOW
// b10 -> HIGH
// b11 -> not use.
const static uint32_t tbl_manchester[256] = {
0x66666666, 0x66666669, 0x66666696, 0x66666699, 0x66666966, 0x66666969, 0x66666996, 0x66666999, 0x66669666, 0x66669669, 0x66669696, 0x66669699, 0x66669966, 0x66669969, 0x66669996, 0x66669999,
0x66696666, 0x66696669, 0x66696696, 0x66696699, 0x66696966, 0x66696969, 0x66696996, 0x66696999, 0x66699666, 0x66699669, 0x66699696, 0x66699699, 0x66699966, 0x66699969, 0x66699996, 0x66699999,
0x66966666, 0x66966669, 0x66966696, 0x66966699, 0x66966966, 0x66966969, 0x66966996, 0x66966999, 0x66969666, 0x66969669, 0x66969696, 0x66969699, 0x66969966, 0x66969969, 0x66969996, 0x66969999,
0x66996666, 0x66996669, 0x66996696, 0x66996699, 0x66996966, 0x66996969, 0x66996996, 0x66996999, 0x66999666, 0x66999669, 0x66999696, 0x66999699, 0x66999966, 0x66999969, 0x66999996, 0x66999999,
0x69666666, 0x69666669, 0x69666696, 0x69666699, 0x69666966, 0x69666969, 0x69666996, 0x69666999, 0x69669666, 0x69669669, 0x69669696, 0x69669699, 0x69669966, 0x69669969, 0x69669996, 0x69669999,
0x69696666, 0x69696669, 0x69696696, 0x69696699, 0x69696966, 0x69696969, 0x69696996, 0x69696999, 0x69699666, 0x69699669, 0x69699696, 0x69699699, 0x69699966, 0x69699969, 0x69699996, 0x69699999,
0x69966666, 0x69966669, 0x69966696, 0x69966699, 0x69966966, 0x69966969, 0x69966996, 0x69966999, 0x69969666, 0x69969669, 0x69969696, 0x69969699, 0x69969966, 0x69969969, 0x69969996, 0x69969999,
0x69996666, 0x69996669, 0x69996696, 0x69996699, 0x69996966, 0x69996969, 0x69996996, 0x69996999, 0x69999666, 0x69999669, 0x69999696, 0x69999699, 0x69999966, 0x69999969, 0x69999996, 0x69999999,
0x96666666, 0x96666669, 0x96666696, 0x96666699, 0x96666966, 0x96666969, 0x96666996, 0x96666999, 0x96669666, 0x96669669, 0x96669696, 0x96669699, 0x96669966, 0x96669969, 0x96669996, 0x96669999,
0x96696666, 0x96696669, 0x96696696, 0x96696699, 0x96696966, 0x96696969, 0x96696996, 0x96696999, 0x96699666, 0x96699669, 0x96699696, 0x96699699, 0x96699966, 0x96699969, 0x96699996, 0x96699999,
0x96966666, 0x96966669, 0x96966696, 0x96966699, 0x96966966, 0x96966969, 0x96966996, 0x96966999, 0x96969666, 0x96969669, 0x96969696, 0x96969699, 0x96969966, 0x96969969, 0x96969996, 0x96969999,
0x96996666, 0x96996669, 0x96996696, 0x96996699, 0x96996966, 0x96996969, 0x96996996, 0x96996999, 0x96999666, 0x96999669, 0x96999696, 0x96999699, 0x96999966, 0x96999969, 0x96999996, 0x96999999,
0x99666666, 0x99666669, 0x99666696, 0x99666699, 0x99666966, 0x99666969, 0x99666996, 0x99666999, 0x99669666, 0x99669669, 0x99669696, 0x99669699, 0x99669966, 0x99669969, 0x99669996, 0x99669999,
0x99696666, 0x99696669, 0x99696696, 0x99696699, 0x99696966, 0x99696969, 0x99696996, 0x99696999, 0x99699666, 0x99699669, 0x99699696, 0x99699699, 0x99699966, 0x99699969, 0x99699996, 0x99699999,
0x99966666, 0x99966669, 0x99966696, 0x99966699, 0x99966966, 0x99966969, 0x99966996, 0x99966999, 0x99969666, 0x99969669, 0x99969696, 0x99969699, 0x99969966, 0x99969969, 0x99969996, 0x99969999,
0x99996666, 0x99996669, 0x99996696, 0x99996699, 0x99996966, 0x99996969, 0x99996996, 0x99996999, 0x99999666, 0x99999669, 0x99999696, 0x99999699, 0x99999966, 0x99999969, 0x99999996, 0x99999999,
};
#if FCS_DMA_EN
static uint32_t dma_ch;
static dma_channel_config dma_conf;
#else
static uint32_t crc_table[256];
static void _make_crc_table(void) {
for (uint32_t i = 0; i < 256; i++) {
uint32_t c = i;
for (uint32_t j = 0; j < 8; j++) {
c = c & 1 ? (c >> 1) ^ 0xEDB88320 : (c >> 1);
}
crc_table[i] = c;
}
}
#endif
static uint8_t data_8b[DEF_UDP_BUF_SIZE];
static uint16_t ip_identifier = 0;
static uint32_t ip_chk_sum1, ip_chk_sum2, ip_chk_sum3;
// Etherent Frame
static const uint16_t eth_type = 0x0800; // IP
// IPv4 Header
static const uint8_t ip_version = 4; // IP v4
static const uint8_t ip_head_len = 5;
static const uint8_t ip_type_of_service = 0;
static const uint16_t ip_total_len = 20 + DEF_UDP_LEN;
void udp_init(void) {
#if FCS_DMA_EN
dma_ch = dma_claim_unused_channel(true);
#else
_make_crc_table();
#endif
}
void udp_packet_gen_10base(uint32_t *buf, uint8_t *udp_payload) {
uint16_t udp_chksum = 0;
uint32_t i, j, idx = 0, ans;
// Calculate the ip check sum
ip_chk_sum1 = 0x0000C512 + ip_identifier + ip_total_len + (DEF_SYS_PICO_IP1 << 8) + DEF_SYS_PICO_IP2 + (DEF_SYS_PICO_IP3 << 8) + DEF_SYS_PICO_IP4 +
(DEF_SYS_UDP_DST_IP1 << 8) + DEF_SYS_UDP_DST_IP2 + (DEF_SYS_UDP_DST_IP3 << 8) + DEF_SYS_UDP_DST_IP4;
ip_chk_sum2 = (ip_chk_sum1 & 0x0000FFFF) + (ip_chk_sum1 >> 16);
ip_chk_sum3 = ~((ip_chk_sum2 & 0x0000FFFF) + (ip_chk_sum2 >> 16));
//==========================================================================
ip_identifier++;
// Preamble
for (i = 0; i < 7; i++) {
data_8b[idx++] = 0x55;
}
// SFD
data_8b[idx++] = 0xD5;
// Destination MAC Address
data_8b[idx++] = (DEF_SYS_UDP_DST_MAC >> 40) & 0xFF;
data_8b[idx++] = (DEF_SYS_UDP_DST_MAC >> 32) & 0xFF;
data_8b[idx++] = (DEF_SYS_UDP_DST_MAC >> 24) & 0xFF;
data_8b[idx++] = (DEF_SYS_UDP_DST_MAC >> 16) & 0xFF;
data_8b[idx++] = (DEF_SYS_UDP_DST_MAC >> 8) & 0xFF;
data_8b[idx++] = (DEF_SYS_UDP_DST_MAC >> 0) & 0xFF;
// Source MAC Address
data_8b[idx++] = (DEF_SYS_PICO_MAC >> 40) & 0xFF;
data_8b[idx++] = (DEF_SYS_PICO_MAC >> 32) & 0xFF;
data_8b[idx++] = (DEF_SYS_PICO_MAC >> 24) & 0xFF;
data_8b[idx++] = (DEF_SYS_PICO_MAC >> 16) & 0xFF;
data_8b[idx++] = (DEF_SYS_PICO_MAC >> 8) & 0xFF;
data_8b[idx++] = (DEF_SYS_PICO_MAC >> 0) & 0xFF;
// Ethernet Type
data_8b[idx++] = (eth_type >> 8) & 0xFF;
data_8b[idx++] = (eth_type >> 0) & 0xFF;
// IP Header
data_8b[idx++] = (ip_version << 4) | (ip_head_len & 0x0F);
data_8b[idx++] = (ip_type_of_service >> 0) & 0xFF;
data_8b[idx++] = (ip_total_len >> 8) & 0xFF;
data_8b[idx++] = (ip_total_len >> 0) & 0xFF;
data_8b[idx++] = (ip_identifier >> 8) & 0xFF;
data_8b[idx++] = (ip_identifier >> 0) & 0xFF;
data_8b[idx++] = 0x00;
data_8b[idx++] = 0x00;
data_8b[idx++] = 0x80;
data_8b[idx++] = 0x11;
// IP Check SUM
data_8b[idx++] = (ip_chk_sum3 >> 8) & 0xFF;
data_8b[idx++] = (ip_chk_sum3 >> 0) & 0xFF;
// IP Source
data_8b[idx++] = DEF_SYS_PICO_IP1;
data_8b[idx++] = DEF_SYS_PICO_IP2;
data_8b[idx++] = DEF_SYS_PICO_IP3;
data_8b[idx++] = DEF_SYS_PICO_IP4;
// IP Destination
data_8b[idx++] = DEF_SYS_UDP_DST_IP1;
data_8b[idx++] = DEF_SYS_UDP_DST_IP2;
data_8b[idx++] = DEF_SYS_UDP_DST_IP3;
data_8b[idx++] = DEF_SYS_UDP_DST_IP4;
// UDP header
data_8b[idx++] = (DEF_UDP_SRC_PORTNUM >> 8) & 0xFF;
data_8b[idx++] = (DEF_UDP_SRC_PORTNUM >> 0) & 0xFF;
data_8b[idx++] = (DEF_UDP_DST_PORTNUM >> 8) & 0xFF;
data_8b[idx++] = (DEF_UDP_DST_PORTNUM >> 0) & 0xFF;
data_8b[idx++] = (DEF_UDP_LEN >> 8) & 0xFF;
data_8b[idx++] = (DEF_UDP_LEN >> 0) & 0xFF;
data_8b[idx++] = (udp_chksum >> 8) & 0xFF;
data_8b[idx++] = (udp_chksum >> 0) & 0xFF;
// UDP payload
for (i = 0; i < DEF_UDP_PAYLOAD_SIZE; i++) {
data_8b[idx++] = udp_payload[i];
}
//==========================================================================
// FCS Calc
//==========================================================================
#if FCS_DMA_EN
dma_conf = dma_channel_get_default_config(dma_ch);
channel_config_set_transfer_data_size(&dma_conf, DMA_SIZE_8);
channel_config_set_read_increment(&dma_conf, true);
channel_config_set_write_increment(&dma_conf, false);
dma_channel_configure (
dma_ch, // Channel to be configured
&dma_conf, // The configuration we just created
NULL, // Destination address
&data_8b[8], // Source address
(idx-8), // Number of transfers
false // Don't start yet
);
dma_sniffer_enable(dma_ch, 1, true); // CRC Mode = Calculate a CRC-32 (IEEE802.3 polynomial) with bit reversed data
hw_set_bits(&dma_hw->sniff_ctrl,
(DMA_SNIFF_CTRL_OUT_INV_BITS | DMA_SNIFF_CTRL_OUT_REV_BITS));
dma_hw->sniff_data = 0xffffffff; // Initialize CRC-32 seed value
dma_channel_set_read_addr(dma_ch, &data_8b[8], true); // Start transfer
dma_channel_wait_for_finish_blocking(dma_ch); // Wait for transfer
uint32_t crc = dma_hw->sniff_data;
#else
uint32_t crc = 0xffffffff;
for (i = 8; i < idx; i++) {
crc = (crc >> 8) ^ crc_table[(crc ^ data_8b[i]) & 0xFF];
}
crc ^= 0xffffffff;
#endif
data_8b[idx++] = (crc >> 0) & 0xFF;
data_8b[idx++] = (crc >> 8) & 0xFF;
data_8b[idx++] = (crc >> 16) & 0xFF;
data_8b[idx++] = (crc >> 24) & 0xFF;
//==========================================================================
// Manchester Encoder
//==========================================================================
for (i = 0; i < DEF_UDP_BUF_SIZE; i++) {
buf[i] = tbl_manchester[data_8b[i]];
}
// TP_IDL
buf[i] = 0x00000AAA;
}