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esp32/machine_uart: Implement the functionality of timeout_char arg. 

Using it for the rx-timeout.  The value is given as ms, which is then
converted to character times.  A value of less than a character time will
cause the rx call to return immediately after 1 character, which may be
inefficient at high transmission rates.

Addresses #8778.
This commit is contained in:
robert-hh 2022-06-19 08:44:13 +02:00 committed by Damien George
parent 425d8fc0d6
commit 5f4539b0ca
1 changed files with 10 additions and 4 deletions
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14
ports/esp32/machine_uart.c
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@ -267,12 +267,18 @@ STATIC void machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args, co
}
// set timeout_char
// make sure it is at least as long as a whole character (13 bits to be safe)
// make sure it is at least as long as a whole character (12 bits here)
if (args[ARG_timeout_char].u_int != -1) {
self->timeout_char = args[ARG_timeout_char].u_int;
uint32_t min_timeout_char = 13000 / baudrate + 1;
if (self->timeout_char < min_timeout_char) {
self->timeout_char = min_timeout_char;
uint32_t char_time_ms = 12000 / baudrate + 1;
uint32_t rx_timeout = self->timeout_char / char_time_ms;
if (rx_timeout < 1) {
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 1, 0)
uart_set_rx_full_threshold(self->uart_num, 1);
#endif
uart_set_rx_timeout(self->uart_num, 1);
} else {
uart_set_rx_timeout(self->uart_num, rx_timeout);
}
}