From 66562847281736ff2972cf0970c5f5f9dcf68cd9 Mon Sep 17 00:00:00 2001
From: cyber-murmel <marble@chaoscomputer.club>
Date: Tue, 17 May 2022 13:24:42 +0200
Subject: [PATCH] added RTS and DTR to UART interface

---
 src/platforms/common/cdcacm.c   | 22 +++++++++++++++-------
 src/platforms/swlink/platform.h |  4 ++++
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/src/platforms/common/cdcacm.c b/src/platforms/common/cdcacm.c
index ed7b08d..fe90c49 100644
--- a/src/platforms/common/cdcacm.c
+++ b/src/platforms/common/cdcacm.c
@@ -450,13 +450,21 @@ static enum usbd_request_return_codes  cdcacm_control_request(usbd_device *dev,
 	switch(req->bRequest) {
 	case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
 		cdcacm_set_modem_state(dev, req->wIndex, true, true);
-		/* Ignore if not for GDB interface */
-		if(req->wIndex != GDB_IF_NO)
-			return USBD_REQ_HANDLED;
-
-		cdcacm_gdb_dtr = req->wValue & 1;
-
-		return USBD_REQ_HANDLED;
+        switch(req->wIndex) {
+			case UART_IF_NO:
+			    #ifdef USBUSART_DTR_PIN
+				gpio_set_val(USBUSART_PORT, USBUSART_DTR_PIN, !(req->wValue & 1));
+				#endif
+				#ifdef USBUSART_RTS_PIN
+				gpio_set_val(USBUSART_PORT, USBUSART_RTS_PIN, !((req->wValue >> 1) & 1));
+				#endif
+				return USBD_REQ_HANDLED;
+			case GDB_IF_NO:
+				cdcacm_gdb_dtr = req->wValue & 1;
+				return USBD_REQ_HANDLED;
+			default:
+				return USBD_REQ_NOTSUPP;
+		}
 	case USB_CDC_REQ_SET_LINE_CODING:
 		if(*len < sizeof(struct usb_cdc_line_coding))
 			return USBD_REQ_NOTSUPP;
diff --git a/src/platforms/swlink/platform.h b/src/platforms/swlink/platform.h
index 36cab71..1407429 100644
--- a/src/platforms/swlink/platform.h
+++ b/src/platforms/swlink/platform.h
@@ -88,6 +88,8 @@ int usbuart_debug_write(const char *buf, size_t len);
 	gpio_set_mode(USBUSART_PORT, GPIO_MODE_INPUT, \
 				  GPIO_CNF_INPUT_PULL_UPDOWN, USBUSART_RX_PIN); \
 	gpio_set(USBUSART_PORT, USBUSART_RX_PIN); \
+	gpio_set_mode(USBUSART_PORT, GPIO_MODE_OUTPUT_50_MHZ, \
+                  GPIO_CNF_OUTPUT_PUSHPULL, USBUSART_RTS_PIN | USBUSART_DTR_PIN); \
 } while(0)
 
 #define USB_DRIVER      st_usbfs_v1_usb_driver
@@ -110,6 +112,8 @@ int usbuart_debug_write(const char *buf, size_t len);
 #define USBUSART_PORT GPIOB
 #define USBUSART_TX_PIN GPIO6
 #define USBUSART_RX_PIN GPIO7
+#define USBUSART_RTS_PIN GPIO8
+#define USBUSART_DTR_PIN GPIO9
 #define USBUSART_ISR(x) usart1_isr(x)
 #define USBUSART_DMA_BUS DMA1
 #define USBUSART_DMA_CLK RCC_DMA1