diff options
Diffstat (limited to 'usb-serial-rs485/usb_cdcacm-arch.c')
-rw-r--r-- | usb-serial-rs485/usb_cdcacm-arch.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/usb-serial-rs485/usb_cdcacm-arch.c b/usb-serial-rs485/usb_cdcacm-arch.c new file mode 100644 index 0000000..e868861 --- /dev/null +++ b/usb-serial-rs485/usb_cdcacm-arch.c @@ -0,0 +1,82 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au> + * + * 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/cm3/nvic.h> +#include <libopencm3/stm32/dma.h> +#include <libopencm3/stm32/gpio.h> +#include <libopencm3/stm32/rcc.h> +#include <libopencm3/stm32/usart.h> + +#include "usb_cdcacm.h" +#include "syscfg.h" +#include "ringb.h" + + + +int glue_set_line_coding_cb(uint32_t baud, uint8_t databits, + enum usb_cdc_line_coding_bParityType cdc_parity, + enum usb_cdc_line_coding_bCharFormat cdc_stopbits) +{ + int uart_parity; + int uart_stopbits; + + if (databits < 8 || databits > 9) { + return 0; + } + + /* Be careful here, ST counts parity as a data bit */ + switch (cdc_parity) { + case USB_CDC_NO_PARITY: + uart_parity = USART_PARITY_NONE; + break; + case USB_CDC_ODD_PARITY: + uart_parity = USART_PARITY_ODD; + databits++; + break; + case USB_CDC_EVEN_PARITY: + uart_parity = USART_PARITY_EVEN; + databits++; + break; + default: + return 0; + } + + switch (cdc_stopbits) { + case USB_CDC_1_STOP_BITS: + uart_stopbits = USART_STOPBITS_1; + break; + case USB_CDC_2_STOP_BITS: + uart_stopbits = USART_STOPBITS_2; + break; + default: + return 0; + } + + /* Disable the UART while we mess with its settings */ + usart_disable(USART2); + /* Set communication parameters */ + usart_set_baudrate(USART2, baud); + usart_set_databits(USART2, databits); + usart_set_parity(USART2, uart_parity); + usart_set_stopbits(USART2, uart_stopbits); + /* Back to work. */ + usart_enable(USART2); + + return 1; +} |