diff --git a/hardware/chip/haas1000/csi/pwm.c b/hardware/chip/haas1000/csi/pwm.c
index 40f559e101..2d52a581c7 100644
--- a/hardware/chip/haas1000/csi/pwm.c
+++ b/hardware/chip/haas1000/csi/pwm.c
@@ -65,6 +65,7 @@ static int pwm_csi_init(void)
     static aos_pwm_csi_t pwm_csi_dev[CONFIG_PWM_NUM];
     int i;
     for (i = 0; i < CONFIG_PWM_NUM; i++) {
+        ret = csi_pwm_init(&(pwm_csi_dev[i].csi_pwm), idx);
         pwm_csi_dev[i].csi_pwm.dev.idx |= (i);
         if (ret != CSI_OK) {
             return ret;
diff --git a/hardware/chip/rtl872xd/aos_adapter/pwm.c b/hardware/chip/rtl872xd/aos_adapter/pwm.c
index 661bcb2920..6321bff231 100644
--- a/hardware/chip/rtl872xd/aos_adapter/pwm.c
+++ b/hardware/chip/rtl872xd/aos_adapter/pwm.c
@@ -207,7 +207,7 @@ static const aos_pwm_ops_t rtl872xd_pwm_ops = {
 
 static int rtl872xd_pwm_init(void)
 {
-    int ret;
+    int ret = 0;
     static rtl872xd_pwm_t pwm_dev[CONFIG_PWM_NUM];
     int idx = 0, i;
     RTIM_TimeBaseInitTypeDef TIM_InitStruct;
@@ -216,8 +216,13 @@ static int rtl872xd_pwm_init(void)
     RTIM_TimeBaseInit(RTL872xD_PWM_TIM[idx], &TIM_InitStruct, TIMER5_IRQ, NULL, (u32)&TIM_InitStruct);
     RTIM_Cmd(RTL872xD_PWM_TIM[idx], ENABLE);
     for (i = 0; i < CONFIG_PWM_NUM; i++) {
-        pwm_dev[i].priv = (TIM_CCInitTypeDef *)malloc(sizeof(TIM_CCInitTypeDef));
-        pwm_dev[i].idx = idx << BIT_PWM_TIM_IDX_SHIFT;
+        if (!pwm_dev[i] || IDX != 0) {
+            ret = -1;
+        }
+        else {
+            pwm_dev[i].priv = (TIM_CCInitTypeDef *)malloc(sizeof(TIM_CCInitTypeDef));
+            pwm_dev[i].idx = idx << BIT_PWM_TIM_IDX_SHIFT;
+        }
         pwm_dev[i].idx |= (i) & (~BIT_PWM_TIM_IDX_FLAG);
         if (ret != 0) {
             return ret;