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Add fifo empty check. 

Signed-off-by: HiFiPhile <admin@hifiphile.com>
This commit is contained in:
HiFiPhile 2021-03-11 20:36:46 +01:00
parent 7fc99a9e11
commit 5caad485f1
1 changed files with 2 additions and 3 deletions
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5
src/class/cdc/cdc_device.c
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@ -434,11 +434,10 @@ bool cdcd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_
{
tu_fifo_write_n(&p_cdc->rx_ff, &p_cdc->epout_buf, xferred_bytes);
// TODO search for wanted char first for better performance
// Check for wanted char and invoke callback if needed
if (tud_cdc_rx_wanted_cb && ( ((signed char) p_cdc->wanted_char) != -1)) {
// Check for wanted char and invoke callback if needed
for (uint32_t i=0; i<xferred_bytes; i++) {
if ( p_cdc->wanted_char == p_cdc->epout_buf[i] ) {
if ( p_cdc->wanted_char == p_cdc->epout_buf[i] && tu_fifo_count(&p_cdc->rx_ff) ) {
tud_cdc_rx_wanted_cb(itf, p_cdc->wanted_char);
}
}