first

board/ports/rs485/SConscript

@@ -0,0 +1,16 @@
+from building import *
+import os
+
+cwd = GetCurrentDir()
+group = []
+src = Glob('*.c')
+CPPPATH = [cwd]
+
+list = os.listdir(cwd)
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        group = group + SConscript(os.path.join(d, 'SConscript'))
+
+group = group + DefineGroup('RS485_port', src, depend = ['BSP_USING_RS485'], CPPPATH = CPPPATH)
+Return('group')

board/ports/rs485/drv_rs485.c

@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-10-24     thread-liu        first version
+ * 2023-05-05     yuanjie           add test method
+ */
+
+#include <rtdevice.h>
+#include <board.h>
+#include <drv_gpio.h>
+#include "drv_rs485.h"
+
+#ifdef BSP_USING_RS485
+
+#define RS485_OUT       rt_pin_write(BSP_RS485_RTS_PIN, PIN_HIGH)
+#define RS485_IN        rt_pin_write(BSP_RS485_RTS_PIN, PIN_LOW)
+
+rt_device_t rs485_serial = {0};
+struct rt_semaphore rs485_rx_sem = {0};
+
+/* uart send data callback function */
+static rt_err_t rs485_output(rt_device_t dev, void * buffer)
+{
+    return RT_EOK;
+}
+
+/* uart receive data callback function */
+static rt_err_t rs485_input(rt_device_t dev, rt_size_t size)
+{
+    rt_sem_release(&rs485_rx_sem);
+
+    return RT_EOK;
+}
+
+/* send string */
+int rs485_send_data(char *tbuf, rt_uint16_t t_len)
+{
+    /* change rs485 mode */
+    RS485_OUT;
+
+    /* send data */
+    rt_device_write(rs485_serial, 0, tbuf, t_len);
+
+    /* change rs485 mode */
+    RS485_IN;
+
+    rt_kprintf("\nsend:");
+    for(int i =0;i<t_len;i++)
+    {
+        rt_kprintf("%d:%x ",i,tbuf[i]);
+    }
+    return RT_EOK;
+}
+
+#ifndef BSP_USING_LED_MATRIX_RS485_DEMO
+static void rs485_thread_entry(void *parameter)
+{
+    char ch;
+
+    while (1)
+    {
+        /* A byte of data is read from a rs485_serial port, and if it is not read, it waits for the received semaphore */
+        while (rt_device_read(rs485_serial, -1, &ch, 1) != 1)
+        {
+            rt_sem_take(&rs485_rx_sem, RT_WAITING_FOREVER);
+        }
+        // rt_kprintf("%c",ch);
+    }
+}
+#endif
+
+/* rs485 rts pin init */
+int rs485_init(void)
+{
+    /* find uart device */
+    rs485_serial = rt_device_find(RS485_UART_DEVICE_NAME);
+    if (!rs485_serial)
+    {
+        rt_kprintf("find %s failed!\n", RS485_UART_DEVICE_NAME);
+        return -RT_ERROR;
+    }
+
+    rt_device_open(rs485_serial, RT_DEVICE_FLAG_INT_RX);
+
+    /* set receive data callback function */
+    rt_device_set_rx_indicate(rs485_serial, rs485_input);
+
+    /* set the send completion callback function */
+    rt_device_set_tx_complete(rs485_serial, rs485_output);
+
+    rt_pin_mode(BSP_RS485_RTS_PIN, PIN_MODE_OUTPUT);
+
+    RS485_IN;
+
+    rt_sem_init(&rs485_rx_sem, "rs485_rx_sem", 0, RT_IPC_FLAG_FIFO);
+#ifndef BSP_USING_LED_MATRIX_RS485_DEMO
+    /* create rs485 receive thread */
+     rt_thread_t thread = rt_thread_create("rs485", rs485_thread_entry, RT_NULL, 1024, 25, 10);
+#else
+    extern void led_matrix_receieve_task(void *parameter);
+    rt_thread_t thread = rt_thread_create("rs485", led_matrix_receieve_task, RT_NULL, 1024, 20, 10);
+#endif
+
+    if (thread != RT_NULL)
+    {
+        rt_thread_startup(thread);
+    }
+    else
+    {
+        return -RT_ERROR;
+    }
+
+    return RT_EOK;
+}
+// INIT_DEVICE_EXPORT(rs485_init);
+
+void rs485_test(int argc, void **argv)
+{
+    char *str;
+    if (argc == 1)
+    {
+        rt_kprintf("-t  --Enter any keys to send.\n");
+    }
+    else if (argc == 3)
+    {
+        if (rt_strcmp(argv[1], "-t") == 0)
+        {
+            str = argv[2];
+            rs485_send_data(str, rt_strnlen(str, 32));
+        }
+    }
+}
+MSH_CMD_EXPORT(rs485_test, test rs485 transmission);
+
+#endif /* BSP_USING_RS485 */

board/ports/rs485/drv_rs485.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-10-24     thread-liu        first version
+ */
+
+#ifndef __DRV_RS485_H__
+#define __DRV_RS485_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RS485_SEND_MODE      0
+#define RS485_RECV_MODE      1
+
+extern rt_device_t rs485_serial;
+extern struct rt_semaphore rs485_rx_sem;
+extern int rs485_send_data(char *tbuf, rt_uint16_t t_len);
+extern int rs485_init(void);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* drv_rs485.h */