s32_t UART_get_buf(uart *u, u8_t* dst, u16_t len) {
UART_SET_RX_IRQ_OFF(u);
u16_t avail = UART_rx_available(u);
s32_t len_to_read = MIN(avail, len);
if (len_to_read == 0) {
UART_SET_RX_IRQ_ON(u);
return 0;
}
u32_t remaining = len_to_read;
u32_t len_to_end = UART_RX_BUFFER - u->rx.rix;
if (remaining > len_to_end) {
if (dst) {
memcpy(dst, &u->rx.buf[u->rx.rix], len_to_end);
dst += len_to_end;
}
remaining -= len_to_end;
u->rx.rix = 0;
}
if (dst) {
memcpy(dst, &u->rx.buf[u->rx.rix], remaining);
}
u->rx.rix += remaining;
if (u->rx.rix >= UART_RX_BUFFER) {
u->rx.rix = 0;
}
UART_SET_RX_IRQ_ON(u);
return len_to_read;
}
static int f_uread(int uart, int numchars) {
if (_argc < 1 || _argc > 2) {
return -1;
}
if (uart < 0 || uart >= CONFIG_UART_CNT) {
return -1;
}
if (_argc == 1) {
numchars = 0x7fffffff;
}
int l = UART_rx_available(_UART(uart));
l = MIN(l, numchars);
int ix = 0;
while (ix++ < l) {
print("%c", UART_get_char(_UART(uart)));
}
print("\n%i bytes read\n", l);
return 0;
}