majerle / lwpkt Goto Github PK

Hi, your packet manager has good approach. Just the problem is start 0xAA and end 0x55 bytes. These start and end are not optional when compiling while other features are option.
The problem is that when it is intend to use from "lwpkt" in the multi-processor communication that support 9th bit of data Address byte, (something like ATMEGA chip of serial port) this address (destination) will help processor hardware to check input frame in multi-drop serial networks.
So it is recommended to do option the start and end bytes and also reverse the position of FROM with TO byte (right now FROM is first byte and TO in next in current packet structure) For use from "lwpkt" in the multi-processor communication the first byte of packet should be TO field.
What is your idea about this feature?

The cmake variable "PROJECT_IS_TOP_LEVEL" is used in top-level CMakeLists.txt , which is available since cmake version 3.21 according to cmake.org, although the version 3.0.0 is required by the Project.

I'm compiling the library, with cmd disabled, so in lwpkt_opts: #define LWPKT_CFG_USE_CMD 0.
When compiling, I get an error on line 611 of lwpkt.c, there is an "undeclared, first use in this functions" kind of error, it is referring to cmd, used inside the second if of the two about command, is a #if LWPKT_CFG_USE_CMD necessary for those two ifs?

版本V1.2.0中，lwpkt.c第56行：
#define ADD_IN_TO_CRC(val)
编译报错：
lwpkt.c(181): error: #55-D: too many arguments in invocation of macro "ADD_IN_TO_CRC"

Hi Majrele,

I am planning to construct Multi Device Communication over UART (RS485) protocol. I found LwPKT interesting project to use it.
But i am unable to figure out the usage with STM32 UART Interrupt based function. Could you able to give some hints regarding it.

/* Start DMA /
if(HAL_UART_Receive_DMA(&huart2, (uint8_t)pkt_tx_rb_data, 64) != HAL_OK)
{
Error_Handler();
}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
res = lwpkt_write(&pkt,

	#if LWPKT_CFG_USE_ADDR
						0x11,                       /* End address to whom to send */
	#endif /* LWPKT_CFG_USE_ADDR */

	#if LWPKT_CFG_USE_CMD
						0x85,                       /* Command type */
	#endif /* LWPKT_CFG_USE_CMD */
						data, strlen(data));        /* Length of data and actual data */

}

Is the timeout calculation works If system tick runover the 32 bit timestamp?