Hi, I am using the STR912FA and I am trying to implement the UART communication using interrupts. I am using the interrupt only for receiving data, but for some reason I never get an interrupt when writing a character in the hyperterminal ... The transmition works ok using the printf to the hyperterminal. Does someone see something wrong in my code? Thanks a lot!
This is my UART initialization:
// UART Module UART_InitStructure.UART_WordLength = UART_WordLength_8D; UART_InitStructure.UART_StopBits = UART_StopBits_1; UART_InitStructure.UART_Parity = UART_Parity_No ; UART_InitStructure.UART_BaudRate = 115200; UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None; UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx; UART_InitStructure.UART_FIFO = UART_FIFO_Disable; UART_DeInit(UART0); UART_Init(UART0, &UART_InitStructure); UART_Cmd(UART0, ENABLE); UART_ITConfig(UART0, UART_IT_Receive, ENABLE); VIC_DeInit(); VIC_Config(UART0_ITLine, VIC_IRQ, 2); VIC_ITCmd(UART0_ITLine, ENABLE);
This is the interrupt (That I never get):
void UART0_IRQHandler(void) { /*clear receive interrupt flag*/ UART_ClearITPendingBit(UART0, UART_IT_Receive); //UART_ClearITPendingBit(UART0, UART_IT_Transmit); /*send back the received character*/ while(UART_GetFlagStatus(UART0, UART_FLAG_TxFIFOFull) != RESET); UART_SendData(UART0, UART_ReceiveData(UART0)); }
This is my byte transmition (works):
int MyLowLevelPutchar(int x) { UART_SendData(UART0, x); while(UART_GetFlagStatus(UART0, UART_FLAG_TxFIFOFull) == SET); return x; }
You changed your code in an incorrect way.
You should have an empty loop while the FIFO is full (just like the original code had) but _before_ the insert.
First after you end this loop should you do the insert. Now you changed the code to do the insert inside a conditional.
// Wait until room for at least one more character in FIFO while(UART_GetFlagStatus(UART0,UART_FLAG_TxFIFOFull) == SET) ; // Insert character in FIFO and return. UART_SendData(UART0, x); return x;