Uart improvments (esphome#1024)

* uart: Add support for specifying the number of bits and parity.

ESP8266SwSerial doesn't really check parity but just read the parity bit
and ignore it when receiving data.

Signed-off-by: 0hax <[email protected]>

* uart: support begin and end methods.

A component may need to reset uart buffer/status by using begin() and
end() methods. This is useful for example when a component needs to be
sure it is not reading garbage from previously received data over uart.
For end() methods with software serial, disabling interrupt is
currently impossible because of a bug in esp8266 Core:
esp8266/Arduino#6049

Signed-off-by: 0hax <[email protected]>

* esphal: add support for detaching an interrupt.

That's needed when a component needs to enable/disable interrupt on a
gpio.

Signed-off-by: 0hax <[email protected]>

* uart: rename CONF_NR_BITS to CONF_DATA_BITS_NUMBER.

Signed-off-by: 0hax <[email protected]>

* uart: use static const uint32_t instead of #define.

Signed-off-by: 0hax <[email protected]>

* uart: use an enum to handle parity.

Signed-off-by: 0hax <[email protected]>

* uart: split between esp32 and esp8266.

Signed-off-by: 0hax <[email protected]>

* uart: check_uart_settings for parity and number of data bits.

Signed-off-by: 0hax <[email protected]>

* name param data_bits

* add new params to test

Co-authored-by: Guillermo Ruffino <[email protected]>

Author: 2 people

esphome/components/uart/__init__.py

@@ -28,13 +28,25 @@ def validate_rx_pin(value):
     return value
 
 
+UARTParityOptions = uart_ns.enum('UARTParityOptions')
+UART_PARITY_OPTIONS = {
+    'NONE': UARTParityOptions.UART_CONFIG_PARITY_NONE,
+    'EVEN': UARTParityOptions.UART_CONFIG_PARITY_EVEN,
+    'ODD': UARTParityOptions.UART_CONFIG_PARITY_ODD,
+}
+
 CONF_STOP_BITS = 'stop_bits'
+CONF_DATA_BITS = 'data_bits'
+CONF_PARITY = 'parity'
+
 CONFIG_SCHEMA = cv.All(cv.Schema({
     cv.GenerateID(): cv.declare_id(UARTComponent),
     cv.Required(CONF_BAUD_RATE): cv.int_range(min=1),
     cv.Optional(CONF_TX_PIN): pins.output_pin,
     cv.Optional(CONF_RX_PIN): validate_rx_pin,
     cv.Optional(CONF_STOP_BITS, default=1): cv.one_of(1, 2, int=True),
+    cv.Optional(CONF_DATA_BITS, default=8): cv.int_range(min=5, max=8),
+    cv.Optional(CONF_PARITY, default="NONE"): cv.enum(UART_PARITY_OPTIONS, upper=True)
 }).extend(cv.COMPONENT_SCHEMA), cv.has_at_least_one_key(CONF_TX_PIN, CONF_RX_PIN))
 
 
@@ -50,6 +62,8 @@ def to_code(config):
     if CONF_RX_PIN in config:
         cg.add(var.set_rx_pin(config[CONF_RX_PIN]))
     cg.add(var.set_stop_bits(config[CONF_STOP_BITS]))
+    cg.add(var.set_data_bits(config[CONF_DATA_BITS]))
+    cg.add(var.set_parity(config[CONF_PARITY]))
 
 
 # A schema to use for all UART devices, all UART integrations must extend this!