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future-proof for buffer size changes

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sommersoft 2018-03-26 06:25:04 +00:00
parent ef16109c5d
commit 23009fdd63
1 changed files with 10 additions and 10 deletions
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10
ports/atmel-samd/usb.c
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@ -222,17 +222,17 @@ void init_usb(void) {
}
static bool cdc_enabled(void) {
if (mp_cdc_enabled) {
return true;
}
if (!cdcdf_acm_is_enabled()) {
mp_cdc_enabled = false;
return false;
}
if (!mp_cdc_enabled) {
cdcdf_acm_register_callback(CDCDF_ACM_CB_READ, (FUNC_PTR)read_complete);
cdcdf_acm_register_callback(CDCDF_ACM_CB_WRITE, (FUNC_PTR)write_complete);
cdcdf_acm_register_callback(CDCDF_ACM_CB_STATE_C, (FUNC_PTR)usb_device_cb_state_c);
cdcdf_acm_register_callback(CDCDF_ACM_CB_LINE_CODING_C, (FUNC_PTR)usb_device_cb_line_coding_c);
mp_cdc_enabled = true;
}
return true;
}
@ -240,7 +240,7 @@ static bool cdc_enabled(void) {
bool usb_bytes_available(void) {
// Check if the buffer has data, but not enough
// space to hold another read.
if (usb_rx_count > CDC_BULKOUT_SIZE) {
if (usb_rx_count > USB_RX_BUF_SIZE - CDC_BULKOUT_SIZE) {
return usb_rx_count > 0;
}
// Buffer has enough room
@ -319,7 +319,7 @@ bool usb_connected(void) {
// also make sure we have enough room in the local buffer
void usb_cdc_background() {
//
if (mp_interrupt_char != -1 && cdc_enabled() && !pending_read && usb_rx_count < CDC_BULKOUT_SIZE) {
if (mp_interrupt_char != -1 && cdc_enabled() && !pending_read && (usb_rx_count < USB_RX_BUF_SIZE - CDC_BULKOUT_SIZE)) {
start_read();
}
}