From 07736774c7ec35fc9686e3a88c1d3cee31ad8ef5 Mon Sep 17 00:00:00 2001
From: Daniel Peter Chokola <dan.chokola@gmail.com>
Date: Tue, 13 Jun 2023 20:30:45 -0400
Subject: [PATCH] add sx127x_txdone() function to poll for Tx done

---
 Inc/sx127x.h |  1 +
 Src/sx127x.c | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/Inc/sx127x.h b/Inc/sx127x.h
index 73505ca..fbe9124 100644
--- a/Inc/sx127x.h
+++ b/Inc/sx127x.h
@@ -35,5 +35,6 @@ int32_t sx127x_rx(sx127x_t *sx127x, uint8_t *buf);
 int32_t sx127x_snr(sx127x_t *sx127x);
 int32_t sx127x_rssi(sx127x_t *sx127x);
 int32_t sx127x_rand(sx127x_t *sx127x);
+int32_t sx127x_txdone(sx127x_t *sx127x);
 
 #endif /* SX127X_INC_SX127X_H_ */
diff --git a/Src/sx127x.c b/Src/sx127x.c
index 6b4134e..244542c 100644
--- a/Src/sx127x.c
+++ b/Src/sx127x.c
@@ -440,6 +440,18 @@ int32_t sx127x_rand(sx127x_t *sx127x)
 	return tmp;
 }
 
+int32_t sx127x_txdone(sx127x_t *sx127x)
+{
+	uint8_t irq;
+
+	/* read IRQ flags */
+	return_val_if_fail(sx127x_readbyte(sx127x, SX127X_REG_IRQFLAGS, &irq) == 0, -1);
+	/* clear the TXDONE flag */
+	return_val_if_fail(sx127x_writebyte(sx127x, SX127X_REG_IRQFLAGS, irq & ~SX127X_IRQFLAGS_TXDONE) == 0, -1);
+
+	return irq & SX127X_IRQFLAGS_TXDONE;
+}
+
 static int32_t sx127x_writebyte(sx127x_t *sx127x, uint8_t reg, uint8_t byte)
 {
 	uint8_t txdata[2] = { WREG(reg), byte };