OrgApache/incubator-nuttx
OrgApache
/
incubator-nuttx
mirror of https://github.com/apache/incubator-nuttx.git
1
0
Fork 0
Code Issues Releases Wiki Activity

stm32l4 serial fix: clock divider for baud rate was not correctly set

This commit is contained in:
Matias Nitsche 2020-04-19 17:48:16 -03:00 committed by Abdelatif Guettouche
parent fdb7e6e460
commit 3f1e89e30f
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm/src/stm32l4/stm32l4_serial.c
View File

@ -963,11 +963,14 @@ static void stm32l4serial_setformat(FAR struct uart_dev_s *dev)
/* Use oversamply by 8 only if the divisor is small. But what is small? */
cr1 = stm32l4serial_getreg(priv, STM32L4_USART_CR1_OFFSET);
brr = stm32l4serial_getreg(priv, STM32L4_USART_BRR_OFFSET);
brr &= ~(USART_BRR_MANT_MASK | USART_BRR_FRAC_MASK);
if (usartdiv8 > 100)
{
/* Use usartdiv16 */
brr = (usartdiv8 + 1) >> 1;
brr |= (usartdiv8 + 1) >> 1;
/* Clear oversampling by 8 to enable oversampling by 16 */
@ -979,7 +982,7 @@ static void stm32l4serial_setformat(FAR struct uart_dev_s *dev)
/* Perform mysterious operations on bits 0-3 */
brr = ((usartdiv8 & 0xfff0) | ((usartdiv8 & 0x000f) >> 1));
brr |= ((usartdiv8 & 0xfff0) | ((usartdiv8 & 0x000f) >> 1));
/* Set oversampling by 8 */