Content originally posted in LPCWare by omid_aramoon on Sat Jan 09 01:25:32 MST 2016
Hi everybody.
I am trying to connect a sm630 fingerprint module to a keil mcb4357 board using USART. I am using CMSIS USART driver for this purpose.
The problem is that when receiving i just get to receive the last byte sent by the fingerprint module.i have no idea why this happens but i have tried a couple supposed solutions but none of them work.for example :
i used a thread to receive data from the beginning of my code to make sure it won't miss any sent data which didn't really work!! Actually,this thread made a little improvement though!! i could receive 3 byte out of 16 sent bytes instead of just receiving one last byte.
i know that the baud rate and every thing is alright.
Here are the code i use for receiving and stuff:
The thread code :
void myUART_Thread(const void* args)
{
int cast ;
char test ;
char temp ;
while(1){
Driver_USART3.Receive(&temp, 1);
osSignalWait(0x01, osWaitForever);
data[offset] = temp ;
offset++;
offset =(offset)%256 ;
}
}
USART Configuration code and stuff:
----------------------------------------------------------------------------------------------------------------------------------------
void myUSART_callback(uint32_t event)
{
switch (event)
{
case ARM_USART_EVENT_RECEIVE_COMPLETE:
case ARM_USART_EVENT_TRANSFER_COMPLETE:
case ARM_USART_EVENT_SEND_COMPLETE:
case ARM_USART_EVENT_TX_COMPLETE:
osSignalSet(m_Thread_id, 0x01);
break;
case ARM_USART_EVENT_RX_TIMEOUT:
__breakpoint(0);
break;
case ARM_USART_EVENT_RX_OVERFLOW:
case ARM_USART_EVENT_TX_UNDERFLOW:
__breakpoint(0);
break;
}
}
--------------------------------------------------------------------------------------------------------------------------------
void Conf_UART(){
volatile int32_t status , send_status;
Driver_USART3.Initialize(myUSART_callback);
Driver_USART3.PowerControl(ARM_POWER_FULL);
Driver_USART3.Control (ARM_USART_ABORT_SEND, 0);
Driver_USART3.Control (ARM_USART_ABORT_RECEIVE, 0);
status = Driver_USART3.Control(ARM_USART_MODE_ASYNCHRONOUS |
ARM_USART_DATA_BITS_8 |
ARM_USART_PARITY_NONE |
ARM_USART_STOP_BITS_2 |
ARM_USART_FLOW_CONTROL_NONE, 57600);
Driver_USART3.Control (ARM_USART_CONTROL_TX, 1);
Driver_USART3.Control (ARM_USART_CONTROL_RX, 1);
}
Can anybody help me?
