Wait for TX completed in usart_disable()

2016-07-14 19:14:56 +02:00 · 2016-07-14 19:14:56 +02:00 · 3a5f8cfc1b
parent 51d2d9e0d9
commit 3a5f8cfc1b
1 changed files with 2 additions and 0 deletions
--- 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))
        ;