Hi guys (and gals) I am working on trying to use PDCA to receive data from a USART on a couple of projects. Both have periods of no data that I would like to use to trigger an USART Timeout to indicate that a data cycle is one and the PDCA needs to switch input buffers. I put a test toggle output in mi USART Timeout interrupt ISR to see how often it triggers. Baud is 9600, trigger rate for Timeout is 4us, regardless of what value I load RTOR with! Below is my code for the USART - I hope someone can point out the errors of my ways - this is one time the wife can't!
void init_USART_0(void)
{
static const gpio_map_t USART_GPIO_MAP =
{
{USART_0_RX_PIN, USART_0_RX_FUNCTION},
{USART_0_TX_PIN, USART_0_TX_FUNCTION},
};
static const usart_options_t USART_0_OPTIONS =
{
.baudrate = USART_0_BAUD_RATE,
.charlength = USART_0_CHARLENGTH,
.paritytype = USART_0_PARITY,
.stopbits = USART_0_STOPBITS,
.channelmode = USART_0_MODE
};
gpio_enable_module(USART_GPIO_MAP, sizeof(USART_GPIO_MAP) / sizeof(USART_GPIO_MAP[0]));
usart_init_rs232(USART_0, &USART_0_OPTIONS, CLOCK_PBA_FREQ);
return;
}
void USART_0_Interrupt_Init(void)
{
Disable_global_interrupt();
INTC_init_interrupts();
INTC_register_interrupt(&usart_0_int_handler, USART_0_IRQ, AVR32_INTC_INT0);
USART_0->rtor = 8 << AVR32_USART_RTOR_TO_OFFSET;
USART_0->cr = USART_0->cr | 1 << AVR32_USART_CR_STTTO_OFFSET;
//USART_0->rtor =1024;
USART_0->ier = AVR32_USART_IER_TIMEOUT_MASK;
//USART_0->cr = AVR32_USART_RETTO_MASK;
gpio_tgl_gpio_pin(TEST_LED);
Enable_global_interrupt();
return;
}
__attribute__((__interrupt__))
void usart_0_int_handler(void)
{
int c,b;
if (USART_0->csr & AVR32_USART_TIMEOUT_MASK)
{
gpio_tgl_gpio_pin(TEST_LED);
usart_reset_status(USART_0);
if (buffer_pointer) {
pdca_reload_channel( PDCA_CHANNEL_NUMBER,
(void *)Buffer_2, sizeof(Buffer_2));
}
else {
pdca_reload_channel( PDCA_CHANNEL_NUMBER,
(void *)Buffer_1, sizeof(Buffer_1));
}
/* Switch to the other input buffer */
buffer_pointer = !buffer_pointer;
buffer_ready = !buffer_pointer;
USART_0->cr = AVR32_USART_RETTO_MASK;
}
}Thanks,
David
