From 56a334b8934597f8ebbcb3cabb00570e21497ad5 Mon Sep 17 00:00:00 2001
From: Karl Palsson <karlp@tweak.net.au>
Date: Mon, 31 Jan 2022 22:01:02 +0000
Subject: stm32_uart: add write_blocking helper

A nice easy basic helper for "I just wannna wite a char now!"
---
 uart/stm32_uart.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/uart/stm32_uart.h b/uart/stm32_uart.h
index 08f93d1..c4ba582 100644
--- a/uart/stm32_uart.h
+++ b/uart/stm32_uart.h
@@ -44,4 +44,10 @@ template <typename T>
 class STM32_UART_t : public mmio_ptr<T> {
     public:
         using mmio_ptr<T>::ptr;
+
+	void write_blocking(uint8_t data) const {
+		// wait for TXE/TXFNF
+		while (!(ptr()->ISR & (1<<7)));
+		ptr()->TDR = data;
+	}
 };
-- 
cgit v1.2.3