drivers: serial: stm32: Support for parity in DTS for STM32 uart.
Add support for devicetree property 'parity' for stm32 serial devices.
Signed-off-by: Pauli Salmenrinne <susundberg@gmail.com>
diff --git a/drivers/serial/uart_stm32.c b/drivers/serial/uart_stm32.c
index cf0a6ec..32d7adc 100644
--- a/drivers/serial/uart_stm32.c
+++ b/drivers/serial/uart_stm32.c
@@ -661,6 +661,8 @@
const struct uart_stm32_config *config = DEV_CFG(dev);
struct uart_stm32_data *data = DEV_DATA(dev);
USART_TypeDef *UartInstance = UART_STRUCT(dev);
+ u32_t ll_parity;
+ u32_t ll_datawidth;
__uart_stm32_get_clock(dev);
/* enable clock */
@@ -675,10 +677,31 @@
LL_USART_SetTransferDirection(UartInstance,
LL_USART_DIRECTION_TX_RX);
- /* 8 data bit, 1 start bit, 1 stop bit, no parity */
+ /* Determine the datawidth and parity. If we use other parity than
+ * 'none' we must use datawidth = 9 (to get 8 databit + 1 parity bit).
+ */
+ if (config->parity == 2) {
+ /* 8 databit, 1 parity bit, parity even */
+ ll_parity = LL_USART_PARITY_EVEN;
+ ll_datawidth = LL_USART_DATAWIDTH_9B;
+ } else if (config->parity == 1) {
+ /* 8 databit, 1 parity bit, parity odd */
+ ll_parity = LL_USART_PARITY_ODD;
+ ll_datawidth = LL_USART_DATAWIDTH_9B;
+ } else { /* Default to 8N0, but show warning if invalid value */
+ if (config->parity != 0) {
+ LOG_WRN("Invalid parity setting '%d'."
+ "Defaulting to 'none'.", config->parity);
+ }
+ /* 8 databit, parity none */
+ ll_parity = LL_USART_PARITY_NONE;
+ ll_datawidth = LL_USART_DATAWIDTH_8B;
+ }
+
+ /* Set datawidth and parity, 1 start bit, 1 stop bit */
LL_USART_ConfigCharacter(UartInstance,
- LL_USART_DATAWIDTH_8B,
- LL_USART_PARITY_NONE,
+ ll_datawidth,
+ ll_parity,
LL_USART_STOPBITS_1);
if (config->hw_flow_control) {
@@ -740,7 +763,8 @@
.pclken = { .bus = DT_INST_CLOCKS_CELL(index, bus), \
.enr = DT_INST_CLOCKS_CELL(index, bits) \
}, \
- .hw_flow_control = DT_INST_PROP(index, hw_flow_control)\
+ .hw_flow_control = DT_INST_PROP(index, hw_flow_control),\
+ .parity = DT_INST_PROP(index, parity)\
}; \
\
static struct uart_stm32_data uart_stm32_data_##index = { \
