[add] rs485 driver

bsp/stm32/libraries/HAL_Drivers/config/mp1/spi_config.h

@@ -23,7 +23,6 @@ extern "C" {
     {                                               \
         .Instance = SPI1,                           \
         .bus_name = "spi1",                         \
-        .irq_type = SPI1_IRQn,                      \
     }
 #endif /* SPI1_BUS_CONFIG */
 #endif /* BSP_USING_SPI1 */
@@ -58,7 +57,6 @@ extern "C" {
     {                                               \
         .Instance = SPI2,                           \
         .bus_name = "spi2",                         \
-        .irq_type = SPI2_IRQn,                      \
     }
 #endif /* SPI2_BUS_CONFIG */
 #endif /* BSP_USING_SPI2 */
@@ -93,7 +91,6 @@ extern "C" {
     {                                               \
         .Instance = SPI3,                           \
         .bus_name = "spi3",                         \
-        .irq_type = SPI3_IRQn,                      \
     }
 #endif /* SPI3_BUS_CONFIG */
 #endif /* BSP_USING_SPI3 */
@@ -128,7 +125,6 @@ extern "C" {
     {                                               \
         .Instance = SPI4,                           \
         .bus_name = "spi4",                         \
-        .irq_type = SPI4_IRQn,                      \
     }
 #endif /* SPI4_BUS_CONFIG */
 #endif /* BSP_USING_SPI4 */

bsp/stm32/stm32mp157a-st-ev1/board/Kconfig

@@ -104,6 +104,22 @@ menu "Onboard Peripheral Drivers"
         bool "Enable Multi Function eXpander"
         default n
 
+    menuconfig BSP_USING_RS485
+        bool "Enable RS485 "
+        default n
+        if BSP_USING_RS485
+            comment "set rts pin number "
+            config BSP_RS485_RTS_PIN
+                int "RS485 rts pin number"
+                range 1 176
+                default 5
+
+            config RS485_UART_DEVICE_NAME
+            string "the uart name for rs485"
+            default "uart3"
+
+        endif
+
 endmenu
 
 menu "On-chip Peripheral Drivers"

bsp/stm32/stm32mp157a-st-ev1/board/SConscript

@@ -70,6 +70,9 @@ if GetDepend(['BSP_USING_PWR']):
 if GetDepend(['BSP_USING_LPTIM1']):
     src += Glob('ports/drv_lptim.c')
 
+if GetDepend(['BSP_USING_RS485']):
+    src += Glob('ports/drv_rs485.c')
+
 if GetDepend(['BSP_USING_OPENAMP']):
     src +=  Glob('CubeMX_Config/CM4/Src/ipcc.c')
     src +=  Glob('CubeMX_Config/CM4/Src/openamp.c')

bsp/stm32/stm32mp157a-st-ev1/board/ports/drv_rs485.c

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-10-24     thread-liu        first version
+ */
+
+#include <board.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)
+
+static rt_device_t serial = {0};
+static struct rt_semaphore 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(&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(serial, 0, tbuf, t_len);
+    
+    /* change rs485 mode */
+    RS485_IN;
+    
+    return RT_EOK;
+}
+
+static void rs485_thread_entry(void *parameter)
+{
+    char ch;
+
+    while (1)
+    {
+        /* A byte of data is read from a serial port, and if it is not read, it waits for the received semaphore */
+        while (rt_device_read(serial, -1, &ch, 1) != 1)
+        {
+            rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
+        }
+        
+        /* The data read through the serial port output dislocation */
+        ch = ch + 1;
+        
+        /* send char */
+        rs485_send_data(&ch, 1);
+    }
+}
+
+/* rs485 rts pin init */
+static int rs485_init(void)
+{
+    /* find uart device */
+    serial = rt_device_find(RS485_UART_DEVICE_NAME);
+    if (!serial)
+    {
+        rt_kprintf("find %s failed!\n", RS485_UART_DEVICE_NAME);
+        return RT_ERROR;
+    }  
+
+    rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
+
+    /* set receive data callback function */
+    rt_device_set_rx_indicate(serial, rs485_input);
+    
+    /* set the send completion callback function */
+    rt_device_set_tx_complete(serial, rs485_output);
+        
+    rt_pin_mode(BSP_RS485_RTS_PIN, PIN_MODE_OUTPUT);
+    
+    RS485_IN;
+    
+    rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
+    /* create rs485 thread */
+    rt_thread_t thread = rt_thread_create("rs485", rs485_thread_entry, RT_NULL, 1024, 25, 10);
+
+    if (thread != RT_NULL)
+    {
+        rt_thread_startup(thread);
+    }
+    else
+    {
+        return RT_ERROR;
+    }
+    
+    return RT_EOK;    
+}
+INIT_DEVICE_EXPORT(rs485_init);
+
+#endif /* bsp_using_RS485 */

bsp/stm32/stm32mp157a-st-ev1/board/ports/drv_rs485.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2006-2022, 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
+    
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* drv_rs485.h */