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samd/mphalport: Fix USB CDC tx handling to work reliably. 

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2021-02-12 14:09:01 +11:00
parent f31c6b4840
commit ede6b86a08
1 changed files with 7 additions and 8 deletions
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15
ports/samd/mphalport.c
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@ -80,17 +80,16 @@ void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
if (tud_cdc_connected()) {
for (size_t i = 0; i < len;) {
uint32_t n = len - i;
uint32_t n2 = tud_cdc_write(str + i, n);
if (n2 < n) {
while (!tud_cdc_write_flush()) {
__WFI();
}
if (n > CFG_TUD_CDC_EP_BUFSIZE) {
n = CFG_TUD_CDC_EP_BUFSIZE;
}
while (n > tud_cdc_write_available()) {
__WFI();
}
uint32_t n2 = tud_cdc_write(str + i, n);
tud_cdc_write_flush();
i += n2;
}
while (!tud_cdc_write_flush()) {
__WFI();
}
}
while (len--) {
while (!(USARTx->USART.INTFLAG.bit.DRE)) {