summaryrefslogtreecommitdiffstats
path: root/keyboards/hhkb/serial_uart.c
diff options
context:
space:
mode:
authorJoel Challis <git@zvecr.com>2022-08-08 03:13:16 +0100
committerGitHub <noreply@github.com>2022-08-08 03:13:16 +0100
commit764c542befcdbaabf2be7ae50804671dd6a4d841 (patch)
treefb1ab1670976456d7ccfb6cc5686acd055fca531 /keyboards/hhkb/serial_uart.c
parent972f9a612c0293b16ff5189e694aacd1d2a51916 (diff)
Remove tmk_core 'serial' code (#17866)
Diffstat (limited to 'keyboards/hhkb/serial_uart.c')
-rw-r--r--keyboards/hhkb/serial_uart.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/keyboards/hhkb/serial_uart.c b/keyboards/hhkb/serial_uart.c
new file mode 100644
index 0000000000..d5b5657095
--- /dev/null
+++ b/keyboards/hhkb/serial_uart.c
@@ -0,0 +1,133 @@
+/*
+Copyright 2013 Jun WAKO <wakojun@gmail.com>
+
+This software is licensed with a Modified BSD License.
+All of this is supposed to be Free Software, Open Source, DFSG-free,
+GPL-compatible, and OK to use in both free and proprietary applications.
+Additions and corrections to this file are welcome.
+
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+
+* Neither the name of the copyright holders nor the names of
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <stdbool.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "serial.h"
+
+#ifndef SERIAL_UART_BAUD
+# define SERIAL_UART_BAUD 9600
+#endif
+
+#define SERIAL_UART_UBRR (F_CPU / (16UL * SERIAL_UART_BAUD) - 1)
+#define SERIAL_UART_TXD_READY (UCSR1A & _BV(UDRE1))
+#define SERIAL_UART_RXD_VECT USART1_RX_vect
+
+#ifndef SERIAL_UART_INIT_CUSTOM
+# define SERIAL_UART_INIT_CUSTOM \
+ /* enable TX */ \
+ UCSR1B = _BV(TXEN1); \
+ /* 8-bit data */ \
+ UCSR1C = _BV(UCSZ11) | _BV(UCSZ10);
+#endif
+
+#if defined(SERIAL_UART_RTS_LO) && defined(SERIAL_UART_RTS_HI)
+// Buffer state
+// Empty: RBUF_SPACE == RBUF_SIZE(head==tail)
+// Last 1 space: RBUF_SPACE == 2
+// Full: RBUF_SPACE == 1(last cell of rbuf be never used.)
+# define RBUF_SPACE() (rbuf_head < rbuf_tail ? (rbuf_tail - rbuf_head) : (RBUF_SIZE - rbuf_head + rbuf_tail))
+// allow to send
+# define rbuf_check_rts_lo() \
+ do { \
+ if (RBUF_SPACE() > 2) SERIAL_UART_RTS_LO(); \
+ } while (0)
+// prohibit to send
+# define rbuf_check_rts_hi() \
+ do { \
+ if (RBUF_SPACE() <= 2) SERIAL_UART_RTS_HI(); \
+ } while (0)
+#else
+# define rbuf_check_rts_lo()
+# define rbuf_check_rts_hi()
+#endif
+
+void serial_init(void) {
+ do {
+ // Set baud rate
+ UBRR1L = SERIAL_UART_UBRR;
+ UBRR1L = SERIAL_UART_UBRR >> 8;
+ SERIAL_UART_INIT_CUSTOM;
+ } while (0);
+}
+
+// RX ring buffer
+#define RBUF_SIZE 256
+static uint8_t rbuf[RBUF_SIZE];
+static uint8_t rbuf_head = 0;
+static uint8_t rbuf_tail = 0;
+
+uint8_t serial_recv(void) {
+ uint8_t data = 0;
+ if (rbuf_head == rbuf_tail) {
+ return 0;
+ }
+
+ data = rbuf[rbuf_tail];
+ rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+ rbuf_check_rts_lo();
+ return data;
+}
+
+int16_t serial_recv2(void) {
+ uint8_t data = 0;
+ if (rbuf_head == rbuf_tail) {
+ return -1;
+ }
+
+ data = rbuf[rbuf_tail];
+ rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+ rbuf_check_rts_lo();
+ return data;
+}
+
+void serial_send(uint8_t data) {
+ while (!SERIAL_UART_TXD_READY)
+ ;
+ SERIAL_UART_DATA = data;
+}
+
+// USART RX complete interrupt
+ISR(SERIAL_UART_RXD_VECT) {
+ uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
+ if (next != rbuf_tail) {
+ rbuf[rbuf_head] = SERIAL_UART_DATA;
+ rbuf_head = next;
+ }
+ rbuf_check_rts_hi();
+}