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When UART timeout of zero is given, make read() return data already available

This commit is contained in:
Paul Kierstead 2018-09-01 17:07:30 +00:00
parent 9b98ad7794
commit 2d3f1a10bf
1 changed files with 5 additions and 1 deletions
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6
ports/atmel-samd/common-hal/busio/UART.c
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@ -249,7 +249,7 @@ size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data, size_t
uint64_t start_ticks = ticks_ms; uint64_t start_ticks = ticks_ms;
// Busy-wait until timeout or until we've read enough chars. // Busy-wait until timeout or until we've read enough chars.
while (ticks_ms - start_ticks < self->timeout_ms) { while (ticks_ms - start_ticks <= self->timeout_ms) {
// Read as many chars as we can right now, up to len. // Read as many chars as we can right now, up to len.
size_t num_read = io_read(io, data, len); size_t num_read = io_read(io, data, len);
@ -268,6 +268,10 @@ size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data, size_t
#ifdef MICROPY_VM_HOOK_LOOP #ifdef MICROPY_VM_HOOK_LOOP
MICROPY_VM_HOOK_LOOP MICROPY_VM_HOOK_LOOP
#endif #endif
// If we are zero timeout, make sure we don't loop again (in the event
// we read in under 1ms)
if (self->timeout_ms == 0)
break;
} }
if (total_read == 0) { if (total_read == 0) {