wip: add write timeout in kconfig

README.md

@@ -72,6 +72,30 @@ To execute Twister integration tests, run the following command:
 west twister -T tests --integration
 ```
 
+# API reference
+
+This driver uses a minimalist custom API.
+
+## Read
+```
+int nrf24_read(const struct device *dev, uint8_t *buffer, uint8_t data_len)
+```
+
+This methods reads data\_len bytes from the device dev, and places it in buffer.
+In trigger mode, if NRF24L01\_READ\_TIMEOUT is exceeded, the function times out.
+
+In polling mode, it will loop forever.
+
+# Write
+```
+int nrf24_write(const struct device *dev, uint8_t *buffer, uint8_t data_len)
+```
+
+This methods writes data\_len bytes from buffer, and sends it through device dev.
+In trigger mode, if NRF24L01\_WRITE\_TIMEOUT is exceeded, the function times out.
+
+In polling mode, it will loop forever.
+
 # Troubleshooting
 
 ## No RX received

drivers/nrf24l01/Kconfig

@@ -27,4 +27,11 @@ config NRF24L01_READ_TIMEOUT
 	help
 	  nRF24 timeout for reading, in ms.
 
+config NRF24L01_WRITE_TIMEOUT
+	int "Timout for write operation"
+	depends on NRF24L01_TRIGGER
+	default 100
+	help
+	  nRF24 timeout for writing, in ms.
+
 endif # NRF24L01

drivers/nrf24l01/nrf24l01.c

@@ -710,7 +710,7 @@ static int nrf24l01_write(const struct device *dev, uint8_t *buffer, uint8_t dat
 	k_usleep(10);
 	nrf24l01_toggle_ce(dev, LOW);
 #ifdef CONFIG_NRF24L01_TRIGGER
-	if (k_sem_take(&data->sem, K_MSEC(100)) != 0) {
+	if (k_sem_take(&data->sem, K_MSEC(CONFIG_NRF24L01_WRITE_TIMEOUT)) != 0) {
 		LOG_ERR("TX sending timed out");
 		nrf24l01_toggle_ce(dev, LOW);
 		return -ETIME;

include/app/drivers/nrf24.h

@@ -22,8 +22,10 @@ __subsystem struct nrf24_api {
  *
  * @param dev nrf24 instance.
  * @param buf Read buffer.
+ * @param data_len Number of bytes to read
  *
  * @retval 0 On success.
+ * @retval -EIO Nothing in RX queue (trigger mode)
  * @retval -errno Other negative errno in case of failure.
  */
 __syscall int nrf24_read(const struct device *dev, uint8_t *buffer, uint8_t data_len);
@@ -41,8 +43,12 @@ static inline int z_impl_nrf24_read(const struct device *dev, uint8_t *buffer, u
  *
  * @param dev nrf24 instance.
  * @param buf Write buffer.
+ * @param data_len Number of bytes to write
  *
  * @retval 0 On success.
+ * @retval -ETIME TX sending timed out (trigger mode)
+ * @retval -EIO Max retries exceeded (polling mode)
+ * @retval MAX_RT Message not acknowledged (trigger mode)
  * @retval -errno Other negative errno in case of failure.
  */
 __syscall int nrf24_write(const struct device *dev, uint8_t *buffer, uint8_t data_len);