Crash_Override/pico-uart-bridge
1
0
Fork 0
Code Issues Pull requests Projects Releases 1 Packages Wiki Activity

uart-bridge: improve usb_write_bytes

Browse source 
tud_cdc_n_write() may not be able to write the full buffer, so we need to
handle that by moving the remaining bytes in the buffer to the buffer start.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Álvaro Fernández Rojas 2021-02-06 12:05:47 +01:00
parent 7f8226a3a1
commit 206b612bae
1 changed files with 8 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
uart-bridge.c
View file

@ -8,6 +8,7 @@
#include <hardware/uart.h>
#include <pico/multicore.h>
#include <pico/stdlib.h>
#include <string.h>
#include <tusb.h>
#if !defined(MIN)
@ -147,12 +148,15 @@ void usb_write_bytes(uint8_t itf) {
mutex_enter_blocking(&ud->uart_mtx);
count = tud_cdc_n_write(itf, ud->uart_buffer, ud->uart_pos);
if (count) {
ud->uart_pos -= count;
tud_cdc_n_write_flush(itf);
}
if (count < ud->uart_pos)
memcpy(ud->uart_buffer, &ud->uart_buffer[count],
ud->uart_pos - count);
ud->uart_pos -= count;
mutex_exit(&ud->uart_mtx);
if (count)
tud_cdc_n_write_flush(itf);
}
}