Add Full-duplex serial driver for ARM boards (#9842)

1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/chibios/serial_usart.h b/drivers/chibios/serial_usart.h
new file mode 100644
index 0000000000..d35b5d12c6
--- /dev/null
+++ b/drivers/chibios/serial_usart.h
@@ -0,0 +1,78 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+#include "serial.h"
+#include "printf.h"
+
+#include <ch.h>
+#include <hal.h>
+
+#ifndef USART_CR1_M0
+#    define USART_CR1_M0 USART_CR1_M  // some platforms (f1xx) dont have this so
+#endif
+
+#ifndef SERIAL_USART_CR1
+#    define SERIAL_USART_CR1 (USART_CR1_PCE | USART_CR1_PS | USART_CR1_M0)  // parity enable, odd parity, 9 bit length
+#endif
+
+#ifndef SERIAL_USART_CR2
+#    define SERIAL_USART_CR2 (USART_CR2_STOP_1)  // 2 stop bits
+#endif
+
+#ifndef SERIAL_USART_CR3
+#    define SERIAL_USART_CR3 0
+#endif
+
+#if defined(USART1_REMAP)
+#    define USART_REMAP do { (AFIO->MAPR |= AFIO_MAPR_USART1_REMAP); } while(0)
+#elif defined(USART2_REMAP)
+#    define USART_REMAP do { (AFIO->MAPR |= AFIO_MAPR_USART2_REMAP); } while(0)
+#elif defined(USART3_PARTIALREMAP)
+#    define USART_REMAP do { (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_PARTIALREMAP); } while(0)
+#elif defined(USART3_FULLREMAP)
+#    define USART_REMAP do { (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_FULLREMAP); } while(0)
+#endif
+
+#ifndef SELECT_SOFT_SERIAL_SPEED
+#    define SELECT_SOFT_SERIAL_SPEED 1
+#endif
+
+#ifdef SERIAL_USART_SPEED
+// Allow advanced users to directly set SERIAL_USART_SPEED
+#elif SELECT_SOFT_SERIAL_SPEED == 0
+#    define SERIAL_USART_SPEED 460800
+#elif SELECT_SOFT_SERIAL_SPEED == 1
+#    define SERIAL_USART_SPEED 230400
+#elif SELECT_SOFT_SERIAL_SPEED == 2
+#    define SERIAL_USART_SPEED 115200
+#elif SELECT_SOFT_SERIAL_SPEED == 3
+#    define SERIAL_USART_SPEED 57600
+#elif SELECT_SOFT_SERIAL_SPEED == 4
+#    define SERIAL_USART_SPEED 38400
+#elif SELECT_SOFT_SERIAL_SPEED == 5
+#    define SERIAL_USART_SPEED 19200
+#else
+#    error invalid SELECT_SOFT_SERIAL_SPEED value
+#endif
+
+#ifndef SERIAL_USART_TIMEOUT
+#    define SERIAL_USART_TIMEOUT 100
+#endif
+
+#define HANDSHAKE_MAGIC 7