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 | | From: | James Johnson | | Subject: | Atmel serial interrupt (at91r40008) | | Date: | Tue, 11 Jan 2005 08:17:02 -0500 |
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 | I'm trying to get interupt-driven serial IO working on the Atmel
EB40A/AT91R40008. I initialize serial0 this way. In my main loop I am
transmitting a character about once per second. I can see the character on the pc that is plugged
into 'serial A' on the eb40a. However, no interrupt is ever generated. The US0 bit is enabled in
the power-saving register. I'm using a JTAG device to debug the code. I have a breakpoint set in the
serial interrupt but the program never gets ther. I also have some timer interrupts going and they
work.
What am I missing?
void initSerial(void) {
int i;
unsigned long ul;
unsigned int dummy;
US0_CR = ( US_TXDIS | US_RXDIS | US_RSTTX | US_RSTRX | US_RSTSTA);
for (i=1000; i>0; i--);
US0_RCR = 0x00000000;
US0_TCR = 0x00000000;
PIO_PDR = MY_PIO_TXD0 | MY_PIO_RXD0;
US0_MR = US_CLKS_MCK | // use MCK
US_CHRL_8 | // 8 data bits
US_CHMODE_NORMAL |
US_PAR_NO | // no parity
US_NBSTOP_1; // 1 stop bit
dummy = PS_PCSR;
dummy |= 0x00000004;
PS_PCER = dummy; // enable clock input to baud rate gen (power saving)
dummy = dummy ^ 0xffffffff;
PS_PCDR = dummy;
US0_IER = US_ENDTX; // Enable ENDTX interrupt (0x10)
dummy = ~US_ENDTX;
US0_IDR = ~US_ENDTX; // Disable everything else
US0_TPR = (unsigned short)txbuf;
US0_TCR = 1; // TXLEN;
US0_BRGR = 430; // 9600 baud at 66 MHz
for(i = 0; i < TXLEN; i++) {
txbuf[i] = 0x00;
}
US0_CR = US_TXEN; // changes registers: (US0_TPR, US0_TCR)!!!
for (i=1000; i>0; i--);
// Source #2 is USART0
AIC_SMR2 = 0x00000027; // edge triggered / prio = 7
AIC_SVR2 = (unsigned int)serial0_irq; // Address of ISR
dummy = 0x00000004;
AIC_IECR = dummy; // Enable USART0 interrupt
dummy ^= 0xffffffff;
AIC_IDCR = dummy; // disable all other interrupts
AIC_ICCR = 0x00000004; // Clear any USART0 interrupt
return;
}
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| | From: | Tauno Voipio | | Subject: | Re: Atmel serial interrupt (at91r40008) | | Date: | Wed, 12 Jan 2005 09:16:42 GMT |
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| James Johnson wrote:
> I'm trying to get interupt-driven serial IO working on the Atmel
> EB40A/AT91R40008. I initialize serial0 this way. In my main loop I am
> transmitting a character about once per second. I can see the character on the pc that is plugged
> into 'serial A' on the eb40a. However, no interrupt is ever generated. The US0 bit is enabled in
> the power-saving register. I'm using a JTAG device to debug the code. I have a breakpoint set in the
> serial interrupt but the program never gets ther. I also have some timer interrupts going and they
> work.
>
> What am I missing?
--- clip clip ---
You have asked the same question in several groups.
Next time, please cross-post the message so the
responses will come to all the groups. Also,
please think which groups to post in - the
Usenet users get pretty annoyed for massive
off-topic cross-posts. The groups I have seen
your message in (c.a.embedded, c.s.arm) are OK.
Please see my response in comp.arch.embedded.
--
Tauno Voipio
tauno voipio (at) iki fi
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