Posted on June 30, 2010 at 18:38
#irq #rs232 #uart
Dear friends,
I've implemented a sort of tiny PC datalogger via RS232 based on the Discovery board and an ST232 serial interface. It is only 2 ADC channels + 4 DIN + 4DOUT. The sampling time is 15 ms but this is because of Windos Vista and not because of STM8 and communication (19200 baud is large enough). To activate the DOUTs, I give a command to the STM8 which is 2 characters long: the first is a mnemonic like the char ''M'' followed by an unsigned int (u8) which is the output whic I want to activate. The transmission from the PC application (VC++ 6.0) to Discovery is made char by char therefore I needed to manage the Discovery data reception using an IRQ handler which I'd like to attach in the following piece of code. Cut and paste it into the ''stm8s_it.c'' file. It works fine. Stefano &sharpdefine NUM_CMD 2 // Length of the command string example M1, M2 etc. &sharpifdef _COSMIC_ @far @interrupt void UART2_RX_IRQHandler(void) &sharpelse /* _RAISONANCE_ */void UART2_RX_IRQHandler(void) interrupt 21
&sharpendif /* _COSMIC_ */{
/* In order to detect unexpected events during development, it is recommended to set a breakpoint on the following instruction. */if (UART2CmdReady == FALSE)
{ UART2_data[UART2DataNum] = (char)UART2->DR; UART2DataNum++; if (UART2DataNum >= NUM_CMD) UART2CmdReady = TRUE; } return; }&sharpendif /* STM8S105*/ #irq #rs232 #uart
