From 996add96d6cb053767e6b54d73a9197f4be13819 Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Sat, 21 May 2022 01:27:45 -0400
Subject: [PATCH] [stm32][dac] add comment

---
 bsp/stm32/libraries/HAL_Drivers/drv_dac.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_dac.c b/bsp/stm32/libraries/HAL_Drivers/drv_dac.c
index a3ea4a58c6..dd3d8c5b6e 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_dac.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_dac.c
@@ -114,7 +114,8 @@ static rt_uint8_t stm32_dac_get_resolution(struct rt_dac_device *device)
     stm32_dac_handler = device->parent.user_data;
     (void)stm32_dac_handler;
 
-    return 12; /* TODO */
+    /* Only has supported DAC_ALIGN_12B_R, so it will return 12 bits */
+    return 12;
 }
 
 static rt_err_t stm32_set_dac_value(struct rt_dac_device *device, rt_uint32_t channel, rt_uint32_t *value)