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#include "packet_interface.h"
#include "cobs.h"
void usart2_isr(void) {
TRACING_SET(TR_HOST_IF_USART_IRQ);
static struct cobs_decode_state host_cobs_state = {0};
if (USART2_SR & USART_SR_ORE) { /* Overrun handling */
LOG_PRINTF("USART2 data register overrun\n");
/* Clear interrupt flag */
(void)USART2_DR; /* FIXME make sure this read is not optimized out */
host_packet_length = -1;
TRACING_CLEAR(TR_HOST_IF_USART_IRQ);
return;
}
uint8_t data = USART2_DR; /* This automatically acknowledges the IRQ */
if (host_packet_length) {
LOG_PRINTF("USART2 COBS buffer overrun\n");
host_packet_length = -1;
TRACING_CLEAR(TR_HOST_IF_USART_IRQ);
return;
}
ssize_t rv = cobs_decode_incremental(&host_cobs_state, (char *)host_packet_buf, sizeof(host_packet_buf), data);
if (rv == -2) {
LOG_PRINTF("Host interface COBS packet too large\n");
host_packet_length = -1;
} else if (rv == -3) {
LOG_PRINTF("Got double null byte from host\n");
} else if (rv < 0) {
LOG_PRINTF("Host interface COBS framing error\n");
host_packet_length = -1;
} else if (rv > 0) {
host_packet_length = rv;
} /* else just return and wait for next byte */
TRACING_CLEAR(TR_HOST_IF_USART_IRQ);
}
void send_packet(struct dma_usart_file *f, const uint8_t *data, size_t len) {
/* ignore return value as putf is blocking and always succeeds */
(void)cobs_encode_incremental(f, putf, (char *)data, len);
flush(f);
}
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