first and working ethernet

ch9120.h

@@ -0,0 +1,42 @@
+#ifndef _CH9120_H_
+#define _CH9120_H_
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "hardware/uart.h"
+#include "hardware/irq.h"
+
+#define UART_ID1 uart1
+#define INIT_BAUD_RATE 9600
+#define TRANSPORT_BAUD_RATE 115200
+#define DATA_BITS 8
+#define STOP_BITS 1
+#define PARITY UART_PARITY_NONE
+
+#define UART_TX_PIN1 20
+#define UART_RX_PIN1 21
+
+#define CFG_PIN 18
+#define RES_PIN 19
+
+#define TCP_SERVER 0
+#define TCP_CLIENT 1
+#define UDP_SERVER 2
+#define UDP_CLIENT 3
+
+#define Mode1 0x10
+#define LOCAL_IP 0x11
+#define SUBNET_MASK 0x12
+#define GATEWAY 0x13
+#define LOCAL_PORT1 0X14
+#define TARGET_IP1 0x15
+#define TARGET_PORT1 0x16
+#define UART1_BAUD1 0x21
+
+void CH9120_init(void);
+void CH9120_send_data(const char *data, size_t len);
+int CH9120_receive_data(char *buffer, size_t max_len);
+void CH9120_process(void);
+
+#endif