freemodbus: fix mb controller parity propagation issues

Closes https://github.com/espressif/esp-idf/issues/6377

components/freemodbus/port/port.h

@@ -127,6 +127,9 @@ void vMBPortExitCritical(void);
 #define MB_PORT_CHECK_EVENT( event, mask ) ( event & mask )
 #define MB_PORT_CLEAR_EVENT( event, mask ) do { event &= ~mask; } while(0)
 
+#define MB_PORT_PARITY_GET(parity) ((parity != UART_PARITY_DISABLE) ? \
+                                        ((parity == UART_PARITY_ODD) ? MB_PAR_ODD : MB_PAR_EVEN) : MB_PAR_NONE)
+
 // Legacy Modbus logging function
 #if MB_TCP_DEBUG
 void vMBPortLog( eMBPortLogLevel eLevel, const CHAR * szModule,

components/freemodbus/port/portserial.c

@@ -184,7 +184,6 @@ BOOL xMBPortSerialInit(UCHAR ucPORT, ULONG ulBaudRate,
                         UCHAR ucDataBits, eMBParity eParity)
 {
     esp_err_t xErr = ESP_OK;
-    MB_PORT_CHECK((eParity <= MB_PAR_EVEN), FALSE, "mb serial set parity failure.");
     // Set communication port number
     ucUartNumber = ucPORT;
     // Configure serial communication parameters
@@ -200,6 +199,9 @@ BOOL xMBPortSerialInit(UCHAR ucPORT, ULONG ulBaudRate,
         case MB_PAR_EVEN:
             ucParity = UART_PARITY_EVEN;
             break;
+        default:
+            ESP_LOGE(TAG, "Incorrect parity option: %d", eParity);
+            return FALSE;
     }
     switch(ucDataBits){
         case 5:

components/freemodbus/port/portserial_m.c

@@ -180,7 +180,6 @@ static void vUartTask(void* pvParameters)
 BOOL xMBMasterPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
 {
     esp_err_t xErr = ESP_OK;
-    MB_PORT_CHECK((eParity <= MB_PAR_EVEN), FALSE, "mb serial set parity failure.");
     // Set communication port number
     ucUartNumber = ucPORT;
     // Configure serial communication parameters
@@ -196,6 +195,9 @@ BOOL xMBMasterPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits,
         case MB_PAR_EVEN:
             ucParity = UART_PARITY_EVEN;
             break;
+        default:
+            ESP_LOGE(TAG, "Incorrect parity option: %d", eParity);
+            return FALSE;
     }
     switch(ucDataBits){
         case 5:

components/freemodbus/serial_master/modbus_controller/mbc_serial_master.c

@@ -83,7 +83,7 @@ static esp_err_t mbc_serial_master_setup(void* comm_info)
                 (uint32_t)comm_info_ptr->mode);
     MB_MASTER_CHECK((comm_info_ptr->port <= UART_NUM_MAX), ESP_ERR_INVALID_ARG,
                 "mb wrong port to set = (0x%x).", (uint32_t)comm_info_ptr->port);
-    MB_MASTER_CHECK((comm_info_ptr->parity <= UART_PARITY_EVEN), ESP_ERR_INVALID_ARG,
+    MB_MASTER_CHECK((comm_info_ptr->parity <= UART_PARITY_ODD), ESP_ERR_INVALID_ARG,
                 "mb wrong parity option = (0x%x).", (uint32_t)comm_info_ptr->parity);
     // Save the communication options
     mbm_opts->mbm_comm = *(mb_communication_info_t*)comm_info_ptr;
@@ -102,7 +102,9 @@ static esp_err_t mbc_serial_master_start(void)
 
     // Initialize Modbus stack using mbcontroller parameters
     status = eMBMasterSerialInit((eMBMode)comm_info->mode, (UCHAR)comm_info->port,
-                            (ULONG)comm_info->baudrate, (eMBParity)comm_info->parity);
+                                    (ULONG)comm_info->baudrate,
+                                    MB_PORT_PARITY_GET(comm_info->parity));
+
     MB_MASTER_CHECK((status == MB_ENOERR), ESP_ERR_INVALID_STATE,
             "mb stack initialization failure, eMBInit() returns (0x%x).", status);
     status = eMBMasterEnable();

components/freemodbus/serial_slave/modbus_controller/mbc_serial_slave.c

@@ -75,7 +75,7 @@ static esp_err_t mbc_serial_slave_setup(void* comm_info)
                 (uint32_t)comm_settings->slave_addr);
     MB_SLAVE_CHECK((comm_settings->port < UART_NUM_MAX), ESP_ERR_INVALID_ARG,
                 "mb wrong port to set = (0x%x).", (uint32_t)comm_settings->port);
-    MB_SLAVE_CHECK((comm_settings->parity <= UART_PARITY_EVEN), ESP_ERR_INVALID_ARG,
+    MB_SLAVE_CHECK((comm_settings->parity <= UART_PARITY_ODD), ESP_ERR_INVALID_ARG,
                 "mb wrong parity option = (0x%x).", (uint32_t)comm_settings->parity);
 
     // Set communication options of the controller
@@ -91,12 +91,15 @@ static esp_err_t mbc_serial_slave_start(void)
                     "Slave interface is not correctly initialized.");
     mb_slave_options_t* mbs_opts = &mbs_interface_ptr->opts;
     eMBErrorCode status = MB_EIO;
+    const mb_communication_info_t* comm_info = (mb_communication_info_t*)&mbs_opts->mbs_comm;
+
     // Initialize Modbus stack using mbcontroller parameters
-    status = eMBInit((eMBMode)mbs_opts->mbs_comm.mode,
-                         (UCHAR)mbs_opts->mbs_comm.slave_addr,
-                         (UCHAR)mbs_opts->mbs_comm.port,
-                         (ULONG)mbs_opts->mbs_comm.baudrate,
-                         (eMBParity)mbs_opts->mbs_comm.parity);
+    status = eMBInit((eMBMode)comm_info->mode,
+                         (UCHAR)comm_info->slave_addr,
+                         (UCHAR)comm_info->port,
+                         (ULONG)comm_info->baudrate,
+                         MB_PORT_PARITY_GET(comm_info->parity));
+
     MB_SLAVE_CHECK((status == MB_ENOERR), ESP_ERR_INVALID_STATE,
             "mb stack initialization failure, eMBInit() returns (0x%x).", status);
     status = eMBEnable();