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#include <modbus.h>
/**
* Note that this example is not self-contained. User will need to handle UART
* device initialization and relevant HAL/LL library includes. These steps are
* skipped in this example to ensure simplicity - illustrated here is the
* minimum code a user will need to use the modbus library AFTER the these
* steps.
*
*/
/**
* If using CubeMX, the HAL library files will be automatically placed in the
* correct location. The examples were tested with the Makefile option in
* CubeMX.
*
* If not using CubeMX to initialize the project, refer to the HAL/LL user
* manual for instructions on UART initialization.
*
* In order to run the example, the device initialization and superloop code
* will need to be copied from this file into the CubeMX-generated files.
*
*/
/**
*
* Function initialization for the STM32 HAL Library
*
* \brief Since this library was orignally written to work with the STM32 HAL/LL API,
* the UART functions match perfectly and can be directly mapped to the Modbus
* library functions.
*/
MB_StatusTypeDef (*MB_UART_Tx)(void*, uint16_t*, uint8_t*, uint8_t*) =
&HAL_UART_Transmit;
MB_StatusTypeDef (*MB_UART_Rx)(void*, uint16_t*, uint8_t*, uint8_t*) =
&HAL_UART_Receive;
int main()
{
modbus_slave_device modbus_dev_single; /*< Single modbus device node */
/* Multiple modbus device nodes.. after all, what is the point of using
* Modbus in a single point-to-point connection? */
/* Not illustrated beyond the definition, but should be clear enough */
modbus_slave_device modbus_dev_multiple[10];
modbus_dev_single.slave_id = 1; /*< Set the slave ID to 1 */
/* Attach the UART device on the STM32 to this node */
/* Note that initialization of UART1 is not included in this example */
modbus_dev_single.modbus_uart = &huart1;
/* Continuously read the 30001 input register */
uint16_t register = 30001;
while (1) {
MB_StatusTypeDef status = ReadInputRegisters(modbus_dev_single, register, 1);
if (status == MB_OK) {
/* Do something with data in the response buffer */
/* ... */
ClearResponseBuffer(&modbus_dev_single);
}
}
return 1;
}
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