From b452e3f54fa46579182bc5e5fb993347e182d5a1 Mon Sep 17 00:00:00 2001
From: Birte Kristina Friesel <derf@finalrewind.org>
Date: Sat, 27 Jan 2024 18:58:25 +0100
Subject: MSP430FR5969: Add driver for UART output on eUSCI_A1 (stdout1)

---
 src/arch/msp430fr5969lp/Kconfig           | 10 ++++-
 src/arch/msp430fr5969lp/Makefile.inc      |  8 +++-
 src/arch/msp430fr5969lp/driver/stdout1.cc | 64 +++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+), 3 deletions(-)
 create mode 100644 src/arch/msp430fr5969lp/driver/stdout1.cc

(limited to 'src/arch/msp430fr5969lp')

diff --git a/src/arch/msp430fr5969lp/Kconfig b/src/arch/msp430fr5969lp/Kconfig
index 2f0f441..b96a032 100644
--- a/src/arch/msp430fr5969lp/Kconfig
+++ b/src/arch/msp430fr5969lp/Kconfig
@@ -27,8 +27,16 @@ config arch_msp430fr5969lp_driver_spi
 bool "SPI on eUSCI_B0"
 select meta_driver_spi
 
+config arch_msp430fr5969lp_driver_stdout1
+bool "UART Output on eUSCI_A1 / P2.5"
+help
+  TX: P2.5 (eUSCI_A1 / UCA1TXD)
+select meta_driver_stdout1
+
 config arch_msp430fr5969lp_driver_stdin
-bool "UART Input"
+bool "UART Input on eUSCI_A0 / P2.1"
+help
+  RX: P2.1 (eUSCI_A0 / UCA0RXD)
 select meta_driver_stdin
 
 config arch_msp430fr5969lp_driver_timer
diff --git a/src/arch/msp430fr5969lp/Makefile.inc b/src/arch/msp430fr5969lp/Makefile.inc
index 583a95a..0412516 100644
--- a/src/arch/msp430fr5969lp/Makefile.inc
+++ b/src/arch/msp430fr5969lp/Makefile.inc
@@ -75,8 +75,12 @@ ifdef CONFIG_arch_msp430fr5969lp_driver_adc
 	CXX_TARGETS += src/arch/msp430fr5969lp/driver/adc.cc
 endif
 
-ifdef CONFIG_arch_msp430fr5969lp_driver_dmx
-	CXX_TARGETS += src/arch/msp430fr5969lp/driver/dmx.cc
+ifdef CONFIG_arch_msp430fr5969lp_driver_dmx1
+	CXX_TARGETS += src/arch/msp430fr5969lp/driver/dmx1.cc
+endif
+
+ifdef CONFIG_arch_msp430fr5969lp_driver_stdout1
+	CXX_TARGETS += src/arch/msp430fr5969lp/driver/stdout1.cc
 endif
 
 ifdef CONFIG_arch_msp430fr5969lp_driver_stdin
diff --git a/src/arch/msp430fr5969lp/driver/stdout1.cc b/src/arch/msp430fr5969lp/driver/stdout1.cc
new file mode 100644
index 0000000..576eec0
--- /dev/null
+++ b/src/arch/msp430fr5969lp/driver/stdout1.cc
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2020 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/stdout1.h"
+#include <msp430.h>
+
+/*
+ * Baud rate calculation according to datasheet:
+ * N := f_{BRCLK} / Baudrate = F_CPU / 115200 in our case
+ * if N <= 16: OS16 = 0, UCBR0 = int(N)
+ * if N > 16: OS16 = 1, UCBR0 = int(N/16), UCBRF0 = int(((n/16) - int(n/16)) * 16) = int(N)%16
+ * Set UCBRS0 according to table 21-4
+ */
+
+void StandardOutput1::setup()
+{
+	UCA1CTLW0 |= UCSWRST;
+#if F_CPU == 16000000UL
+	// 16M / 115200 == 138.88889 -> UCOS16 = 1, UCBR0 = 16, UCBRF0 = 10, UCBRS0 = 0xf7 ("0.8751")
+	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;
+	UCA1MCTLW = UCOS16 | (10<<4) | 0xF700;
+	UCA1BR0 = 8;
+#elif F_CPU == 8000000UL
+	// 8M / 115200 == 69.444444 -> UCOS16 = 1, UCBR0 = 4, UCBRF0 = 5, UCBRS0 = 0x55 ("0.4378")
+	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;
+	UCA1MCTLW = UCOS16 | (5<<4) | 0x5500;
+	UCA1BR0 = 4;
+#elif F_CPU == 4000000UL
+	// 4M / 115200 == 34.722222 -> UCOS16 = 1, UCBR0 = 2, UCBRF0 = 2, UCBRS0 = 0xbb ("0.7147")
+	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;
+	UCA1MCTLW = UCOS16 | (2<<4) | 0xbb00;
+	UCA1BR0 = 2;
+#elif F_CPU == 1000000UL
+	// 1M / 115200 == 8.6805556 -> UCOS16 = 0, UCBR0 = 8, UCBRF0 = 0, UCBRS0 = 0xd6 ("0.6667")
+	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;
+	UCA1MCTLW = 0x5500;
+	UCA1BR0 = 8;
+#else
+#error Unsupported F_CPU
+#endif
+
+	UCA1IRCTL = 0;
+	UCA1ABCTL = 0;
+
+	P2SEL0 &= ~BIT5;
+	P2SEL1 |= BIT5;
+	P2DIR |= BIT5;
+
+	UCA1CTLW0 &= ~UCSWRST;
+}
+
+void StandardOutput1::put(char c)
+{
+	while (!(UCA1IFG & UCTXIFG));
+	UCA1TXBUF = c;
+
+	if (c == '\n') {
+		put('\r');
+	}
+}
+
+StandardOutput1 kout1;
-- 
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