From 4021b821618e4d584d17b9208fcce96c5675bb7e Mon Sep 17 00:00:00 2001
From: linshire <89723088+linshire@users.noreply.github.com>
Date: Wed, 1 Mar 2023 06:41:17 +0800
Subject: [PATCH] [bsp][ch32] fix the empty function ch32dma_transmit return
 error code as -RT_EIO

---
 bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c
index 4d70381721..f45aaf9381 100644
--- a/bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c
+++ b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c
@@ -345,7 +345,7 @@ static int ch32_getc(struct rt_serial_device *serial)
 
 static rt_ssize_t ch32dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction)
 {
-    return RT_EOK;
+    return -RT_EIO;
 }
 
 static void uart_isr(struct rt_serial_device *serial)