1 files changed, 110 insertions, 0 deletions
diff --git a/libopencm3/lib/sam/common/usart.c b/libopencm3/lib/sam/common/usart.c
new file mode 100644
index 0000000..36833f7
--- /dev/null
+++ b/libopencm3/lib/sam/common/usart.c
@@ -0,0 +1,110 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2013 Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/sam/usart.h>
+#include <libopencm3/sam/pmc.h>
+
+void usart_set_baudrate(uint32_t usart, uint32_t baud)
+{
+	USART_BRGR(usart) = pmc_mck_frequency / (16 * baud);
+}
+
+void usart_set_databits(uint32_t usart, int bits)
+{
+	USART_MR(usart) = (USART_MR(usart) & ~USART_MR_CHRL_MASK) |
+			  ((bits - 5) << 6);
+}
+
+void usart_set_stopbits(uint32_t usart, enum usart_stopbits sb)
+{
+	USART_MR(usart) = (USART_MR(usart) & ~USART_MR_NBSTOP_MASK) |
+			  (sb << 12);
+}
+
+void usart_set_parity(uint32_t usart, enum usart_parity par)
+{
+	USART_MR(usart) = (USART_MR(usart) & ~USART_MR_PAR_MASK) | (par << 9);
+}
+
+void usart_set_mode(uint32_t usart, enum usart_mode mode)
+{
+	USART_CR(usart) =
+		(mode & USART_MODE_RX) ? USART_CR_RXEN : USART_CR_RXDIS;
+	USART_CR(usart) = (mode & USART_MODE_TX) ? USART_CR_TXEN
+						 : USART_CR_TXDIS;
+}
+
+void usart_set_flow_control(uint32_t usart, enum usart_flowcontrol fc)
+{
+	USART_MR(usart) = (USART_MR(usart) & ~USART_MR_MODE_MASK) |
+			  (fc ? USART_MR_MODE_HW_HANDSHAKING : 0);
+}
+
+void usart_enable(uint32_t usart)
+{
+	(void)usart;
+}
+
+void usart_disable(uint32_t usart)
+{
+	(void)usart;
+}
+
+void usart_send(uint32_t usart, uint16_t data)
+{
+	USART_THR(usart) = data;
+}
+
+uint16_t usart_recv(uint32_t usart)
+{
+	return USART_RHR(usart) & 0x1f;
+}
+
+void usart_wait_send_ready(uint32_t usart)
+{
+	while ((USART_CSR(usart) & USART_CSR_TXRDY) == 0);
+}
+
+void usart_wait_recv_ready(uint32_t usart)
+{
+	while ((USART_CSR(usart) & USART_CSR_RXRDY) == 0);
+}
+
+void usart_send_blocking(uint32_t usart, uint16_t data)
+{
+	usart_wait_send_ready(usart);
+	usart_send(usart, data);
+}
+
+uint16_t usart_recv_blocking(uint32_t usart)
+{
+	usart_wait_recv_ready(usart);
+
+	return usart_recv(usart);
+}
+
+void usart_enable_rx_interrupt(uint32_t usart)
+{
+	USART_IER(usart) = USART_CSR_RXRDY;
+}
+
+void usart_disable_rx_interrupt(uint32_t usart)
+{
+	USART_IDR(usart) = USART_CSR_RXRDY;
+}