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drivers: serial: nrf_uarte: Allow TX only instance

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Extended nrf_uarte driver to support TX only UARTE instances.
When RX pin is not provided then RX is not started at all. This
allows to achieve low power with logging/console enabled.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
This commit is contained in:
Krzysztof Chruscinski 2020-01-27 15:47:15 +01:00 • committed by Kumar Gala
commit dcdc61cfdb
2 changed files with 31 additions and 10 deletions
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39
drivers/serial/uart_nrfx_uarte.c
View file

@ -514,6 +514,9 @@ static int uarte_nrfx_rx_enable(struct device *dev, u8_t *buf, size_t len,
const struct uarte_nrfx_config *cfg = get_dev_config(dev);
NRF_UARTE_Type *uarte = get_uarte_instance(dev);
__ASSERT(nrf_uarte_rx_pin_get(uarte) != NRF_UARTE_PSEL_DISCONNECTED,
"TX only UARTE instance");
if (hw_rx_counting_enabled(data)) {
nrfx_timer_clear(&cfg->timer);
} else {
@ -1164,11 +1167,11 @@ static int uarte_instance_init(struct device *dev,
nrf_gpio_pin_write(config->pseltxd, 1);
nrf_gpio_cfg_output(config->pseltxd);
nrf_gpio_cfg_input(config->pselrxd, NRF_GPIO_PIN_NOPULL);
if (config->pselrxd != NRF_UARTE_PSEL_DISCONNECTED) {
nrf_gpio_cfg_input(config->pselrxd, NRF_GPIO_PIN_NOPULL);
}
nrf_uarte_txrx_pins_set(uarte,
config->pseltxd,
config->pselrxd);
nrf_uarte_txrx_pins_set(uarte, config->pseltxd, config->pselrxd);
if (config->pselcts != NRF_UARTE_PSEL_DISCONNECTED &&
config->pselrts != NRF_UARTE_PSEL_DISCONNECTED) {
@ -1200,10 +1203,12 @@ static int uarte_instance_init(struct device *dev,
/* Enable receiver and transmitter */
nrf_uarte_enable(uarte);
nrf_uarte_event_clear(uarte, NRF_UARTE_EVENT_ENDRX);
if (config->pselrxd != NRF_UARTE_PSEL_DISCONNECTED) {
nrf_uarte_event_clear(uarte, NRF_UARTE_EVENT_ENDRX);
nrf_uarte_rx_buffer_set(uarte, &data->rx_data, 1);
nrf_uarte_task_trigger(uarte, NRF_UARTE_TASK_STARTRX);
nrf_uarte_rx_buffer_set(uarte, &data->rx_data, 1);
nrf_uarte_task_trigger(uarte, NRF_UARTE_TASK_STARTRX);
}
#ifdef UARTE_INTERRUPT_DRIVEN
if (interrupts_active) {
@ -1239,7 +1244,9 @@ static void uarte_nrfx_pins_enable(struct device *dev, bool enable)
if (enable) {
nrf_gpio_pin_write(tx_pin, 1);
nrf_gpio_cfg_output(tx_pin);
nrf_gpio_cfg_input(rx_pin, NRF_GPIO_PIN_NOPULL);
if (rx_pin != NRF_UARTE_PSEL_DISCONNECTED) {
nrf_gpio_cfg_input(rx_pin, NRF_GPIO_PIN_NOPULL);
}
if (get_dev_config(dev)->rts_cts_pins_set) {
nrf_gpio_pin_write(rts_pin, 1);
@ -1249,7 +1256,9 @@ static void uarte_nrfx_pins_enable(struct device *dev, bool enable)
}
} else {
nrf_gpio_cfg_default(tx_pin);
nrf_gpio_cfg_default(rx_pin);
if (rx_pin != NRF_UARTE_PSEL_DISCONNECTED) {
nrf_gpio_cfg_default(rx_pin);
}
if (get_dev_config(dev)->rts_cts_pins_set) {
nrf_gpio_cfg_default(cts_pin);
nrf_gpio_cfg_default(rts_pin);
@ -1436,6 +1445,9 @@ static int uarte_nrfx_pm_control(struct device *dev, u32_t ctrl_command,
defined(DT_NORDIC_NRF_UARTE_UART_0_CTS_PIN)
#define UARTE_0_CONFIG_RTS_CTS 1
#endif
#if !defined(DT_NORDIC_NRF_UARTE_UART_0_RX_PIN)
#define DT_NORDIC_NRF_UARTE_UART_0_RX_PIN NRF_UARTE_PSEL_DISCONNECTED
#endif
UART_NRF_UARTE_DEVICE(0);
#endif /* CONFIG_UART_0_NRF_UARTE */
@ -1445,6 +1457,9 @@ static int uarte_nrfx_pm_control(struct device *dev, u32_t ctrl_command,
defined(DT_NORDIC_NRF_UARTE_UART_1_CTS_PIN)
#define UARTE_1_CONFIG_RTS_CTS 1
#endif
#if !defined(DT_NORDIC_NRF_UARTE_UART_1_RX_PIN)
#define DT_NORDIC_NRF_UARTE_UART_1_RX_PIN NRF_UARTE_PSEL_DISCONNECTED
#endif
UART_NRF_UARTE_DEVICE(1);
#endif /* CONFIG_UART_1_NRF_UARTE */
@ -1454,6 +1469,9 @@ static int uarte_nrfx_pm_control(struct device *dev, u32_t ctrl_command,
defined(DT_NORDIC_NRF_UARTE_UART_2_CTS_PIN)
#define UARTE_2_CONFIG_RTS_CTS 1
#endif
#if !defined(DT_NORDIC_NRF_UARTE_UART_2_RX_PIN)
#define DT_NORDIC_NRF_UARTE_UART_2_RX_PIN NRF_UARTE_PSEL_DISCONNECTED
#endif
UART_NRF_UARTE_DEVICE(2);
#endif /* CONFIG_UART_2_NRF_UARTE */
@ -1463,6 +1481,9 @@ static int uarte_nrfx_pm_control(struct device *dev, u32_t ctrl_command,
defined(DT_NORDIC_NRF_UARTE_UART_3_CTS_PIN)
#define UARTE_3_CONFIG_RTS_CTS 1
#endif
#if !defined(DT_NORDIC_NRF_UARTE_UART_3_RX_PIN)
#define DT_NORDIC_NRF_UARTE_UART_3_RX_PIN NRF_UARTE_PSEL_DISCONNECTED
#endif
UART_NRF_UARTE_DEVICE(3);
#endif /* CONFIG_UART_3_NRF_UARTE */

2
dts/bindings/serial/nordic,nrf-uarte.yaml
View file

@ -22,7 +22,7 @@ properties:
rx-pin:
type: int
description: RX pin
required: true
required: false
rts-pin:
type: int