AN3975

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Doc ID 022170 Rev 1

Appendix A

In order to enable or disable close loop test function PLM_To_RS485UART_Send_Data in

the function.c file in the PMeter_RS485_to_PRIME project must be updated accordingly.

Function that avoids close loop test

Void PLM_To_RS485UART_Send_Data(unsigned char* data_buffer, unsigned short

Nb_bytes)

{

GPIO_SetBits(nRE_port, nRE_pin);

//Receiver input disable

GPIO_SetBits(DE_port, DE_pin);

//Driver output enable

ComWrt_direct (0, data_buffer, Nb_bytes, RS485);

while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);

GPIO_ResetBits(DE_port, DE_pin);

//Driver output disable

GPIO_ResetBits(nRE_port, nRE_pin); //Receiver input enable

}

Function that enables close loop test

Use only for this test, do not use when communicating with the RS485 device.

Void PLM_To_RS485UART_Send_Data(unsigned char* data_buffer, unsigned short

Nb_bytes)

{

GPIO_ResetBits(nRE_port, nRE_pin); //Receiver input enable

GPIO_SetBits(DE_port, DE_pin);

//Driver output enable

ComWrt_direct (0, data_buffer, Nb_bytes, RS485);

while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);