Wait for TX completed in usart_disable()

edogaldo · edogaldo · commit 3a5f8cfc1b4e · 2016-07-14T19:14:56.000+02:00
diff --git a/STM32F1/cores/maple/libmaple/usart.c b/STM32F1/cores/maple/libmaple/usart.c
@@ -70,6 +70,8 @@ void usart_disable(usart_dev *dev) {
     /* FIXME this misbehaves (on F1) if you try to use PWM on TX afterwards */
     usart_reg_map *regs = dev->regs;
 
+    while(!rb_is_empty(dev->wb))
+        ; // wait for TX completed
     /* TC bit must be high before disabling the USART */
     while((regs->CR1 & USART_CR1_UE) && !(regs->SR & USART_SR_TC))
         ;

Original file line number	Diff line number	Diff line change
`@@ -70,6 +70,8 @@ void usart_disable(usart_dev *dev) {`
`70`	`70`	`/* FIXME this misbehaves (on F1) if you try to use PWM on TX afterwards */`
`71`	`71`	`usart_reg_map *regs = dev->regs;`
`72`	`72`
	`73`	`+ while(!rb_is_empty(dev->wb))`
	`74`	`+ ; // wait for TX completed`
`73`	`75`	`/* TC bit must be high before disabling the USART */`
`74`	`76`	`while((regs->CR1 & USART_CR1_UE) && !(regs->SR & USART_SR_TC))`
`75`	`77`	`;`