From e63e33a3c64327aef3556fa811df0a8ec1e0e7ee Mon Sep 17 00:00:00 2001
From: linshire <89723088+linshire@users.noreply.github.com>
Date: Sun, 26 Feb 2023 02:50:33 +0800
Subject: [ch32][bsp] fix warning: rt_size_t to rt_ssize_t

---
 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 0d950f7dd3..4d70381721 100644
--- a/bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c
+++ b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c
@@ -343,7 +343,7 @@ static int ch32_getc(struct rt_serial_device *serial)
     return ch;
 }
 
-rt_size_t ch32dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction)
+static rt_ssize_t ch32dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction)
 {
     return RT_EOK;
 }
-- 
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