Hello,
Could you help to install the ST timer on the AT91Rm9200? I don't know how to setup the AIC registers correct. Maybe there are more than one big mistake.
void initialize_pit() { unsigned int flag, period, irq_id, mask, oldHandler, src_type, priority; volatile int status; void *newHandler; //period Timer0->ST_PIMR = period << 5; AT91F_ST_SetPeriodInterval(Timer0, period); //state //status = Timer0->ST_SR; //enable interrupt flag=1; Timer0->ST_IER = flag; AT91F_ST_EnableIt( Timer0, flag); //enable PMC AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC, 1 << AT91C_ID_IRQ0); //config AIC irq_id = 0; oldHandler = pAic->AIC_SVR[irq_id]; mask = 0x1 << irq_id; pAic->AIC_IDCR = mask ; pAic->AIC_SVR[irq_id] = (unsigned int) newHandler ; //* Store the Source Mode Register pAic->AIC_SMR[irq_id] = src_type | priority ; AT91F_AIC_ConfigureIt(pAic, irq_id, priority, src_type, newHandler); //enable AIC AT91F_AIC_EnableIt(pAic, 1); }
I hope somebody could help me with this problem...
best regards johannes
the usart is working correct - I test it. Therefore there must be still a problem that the ST_interrupt function don't run.
AT91PS_USART COM1_1; /* Variable COM1 für die Struct _AT91S_USART definieren */ void initialize_usart1() { COM1_1= AT91C_BASE_US1; /* AT91C_BASE_US1 ist die Base-Adresse für den UART1 */ /* Define RXD and TXD as peripheral */ AT91F_PIO_CfgPeriph(AT91C_BASE_PIOB,AT91C_PB21_RXD1 | AT91C_PB20_TXD1,0); // First, enable the clock of the PIOB (for the USART) AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<<AT91C_ID_US1 ) ; // Usart Configure AT91F_US_Configure (COM1_1, MCK,AT91C_US_ASYNC_MODE, 115200, 0); // Enable usart COM1_1->US_CR = AT91C_US_RXEN | AT91C_US_TXEN; // setzen der beiden Variablen im US_CR Register AT91F_US_PutChar (COM1_1,'X'); while( !(COM1_1->US_CSR & AT91C_US_TXRDY) ) continue; }
I'm working with uvision3 and ulink2.
johannes
when I start the program, I can send one character 'u' via the usart - but that's it.
Do you have access to an emulator (i.e. can you set breakpoints in the program and single-step through it) ?
If so, try setting a breakpoint inside the ST interrupt handler. Also, try setting one inside the ST initialization function and single-step through it (you should also be able to watch the contents of the ST registers change).