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Diffstat (limited to 'src/class/cdc/serial')
| -rw-r--r-- | src/class/cdc/serial/ch34x.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/class/cdc/serial/ch34x.h b/src/class/cdc/serial/ch34x.h new file mode 100644 index 000000000..c18066f57 --- /dev/null +++ b/src/class/cdc/serial/ch34x.h @@ -0,0 +1,84 @@ +/* + * The MIT License (MIT) + * + * Copyright (c) 2023 Heiko Kuester + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + * This file is part of the TinyUSB stack. + */ + +#ifndef _CH34X_H_ +#define _CH34X_H_ + +// There is no official documentation for the CH34x (CH340, CH341) chips. Reference can be found +// - https://github.com/WCHSoftGroup/ch341ser_linux +// - https://github.com/torvalds/linux/blob/master/drivers/usb/serial/ch341.c +// - https://github.com/freebsd/freebsd-src/blob/main/sys/dev/usb/serial/uchcom.c + +// set line_coding @ enumeration +#ifdef CFG_TUH_CDC_LINE_CODING_ON_ENUM +#define CFG_TUH_CDC_LINE_CODING_ON_ENUM_CH34X CFG_TUH_CDC_LINE_CODING_ON_ENUM +#else // this default is necessary to work properly +#define CFG_TUH_CDC_LINE_CODING_ON_ENUM_CH34X { 9600, CDC_LINE_CONDING_STOP_BITS_1, CDC_LINE_CODING_PARITY_NONE, 8 } +#endif + +// USB requests +#define CH34X_REQ_READ_VERSION 0x5F // dec 95 +#define CH34X_REQ_WRITE_REG 0x9A // dec 154 +#define CH34X_REQ_READ_REG 0x95 // dec 149 +#define CH34X_REQ_SERIAL_INIT 0xA1 // dec 161 +#define CH34X_REQ_MODEM_CTRL 0xA4 // dev 164 + +// registers +#define CH34X_REG_BREAK 0x05 +#define CH34X_REG_PRESCALER 0x12 +#define CH34X_REG_DIVISOR 0x13 +#define CH34X_REG_LCR 0x18 +#define CH34X_REG_LCR2 0x25 +#define CH34X_REG_MCR_MSR 0x06 +#define CH34X_REG_MCR_MSR2 0x07 +#define CH34X_NBREAK_BITS 0x01 + +#define CH341_REG_0x0F 0x0F // undocumented register +#define CH341_REG_0x2C 0x2C // undocumented register +#define CH341_REG_0x27 0x27 // hardware flow control (cts/rts) + +#define CH34X_REG16_DIVISOR_PRESCALER TU_U16(CH34X_REG_DIVISOR, CH34X_REG_PRESCALER) +#define CH32X_REG16_LCR2_LCR TU_U16(CH34X_REG_LCR2, CH34X_REG_LCR) + +// modem control bits +#define CH34X_BIT_RTS ( 1 << 6 ) +#define CH34X_BIT_DTR ( 1 << 5 ) + +// line control bits +#define CH34X_LCR_ENABLE_RX 0x80 +#define CH34X_LCR_ENABLE_TX 0x40 +#define CH34X_LCR_MARK_SPACE 0x20 +#define CH34X_LCR_PAR_EVEN 0x10 +#define CH34X_LCR_ENABLE_PAR 0x08 +#define CH34X_LCR_PAR_MASK 0x38 // all parity bits +#define CH34X_LCR_STOP_BITS_2 0x04 +#define CH34X_LCR_CS8 0x03 +#define CH34X_LCR_CS7 0x02 +#define CH34X_LCR_CS6 0x01 +#define CH34X_LCR_CS5 0x00 +#define CH34X_LCR_CS_MASK 0x03 // all CSx bits + +#endif /* _CH34X_H_ */ |