From c0ec94e4c94371d22c334396c5d937d0a682de78 Mon Sep 17 00:00:00 2001
From: Karl Palsson <karlp@tweak.net.au>
Date: Mon, 26 Sep 2016 22:04:02 +0000
Subject: ubs-serial-rs485: First solidly working version.

Needs major refactoring to split out the _actual_ arch dependent pieces.
Needs parity and more complete baud rate support.
Needs rs485 support.
---
 tests/usb-serial-rs485/usb_cdcacm-arch.c | 124 +++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 tests/usb-serial-rs485/usb_cdcacm-arch.c

(limited to 'tests/usb-serial-rs485/usb_cdcacm-arch.c')

diff --git a/tests/usb-serial-rs485/usb_cdcacm-arch.c b/tests/usb-serial-rs485/usb_cdcacm-arch.c
new file mode 100644
index 0000000..8680906
--- /dev/null
+++ b/tests/usb-serial-rs485/usb_cdcacm-arch.c
@@ -0,0 +1,124 @@
+/*
+ * 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"
+
+extern bool out_in_progress;
+
+void usb_cdcacm_setup_pre_arch(void)
+{
+	rcc_periph_clock_enable(RCC_GPIOA);
+	rcc_periph_clock_enable(RCC_OTGFS);
+
+	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
+		GPIO9 | GPIO11 | GPIO12);
+	gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO11 | GPIO12);
+
+}
+
+void usb_cdcacm_setup_post_arch(void)
+{
+}
+
+// hacktastic
+extern struct ringb tx_ring;
+void glue_send_data_cb(uint8_t *buf, uint16_t len)
+{
+	if (len == 0) {
+		return;
+	}
+	gpio_set(LED_TX_PORT, LED_TX_PIN);
+	gpio_set(RS485DE_PORT, RS485DE_PIN);
+	for (int x = 0; x < len; x++) {
+		if (!ringb_put(&tx_ring, buf[x])) {
+			// failed to process usb traffic properly.
+			// should _never_ happen, means we failed to nak in time.
+			// this is _never_recoverable beyond watchdog reset.
+			while(1);
+		}
+		usart_enable_tx_interrupt(USART2);
+	}
+}
+
+void glue_set_line_state_cb(uint8_t dtr, uint8_t rts)
+{
+	(void) dtr;
+	(void) rts;
+	// LM4f has an implementation of this if you're keen
+}
+
+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;
+}
-- 
cgit