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drivers: serial: stm32: add LPUART support for L0/L4 series

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LPUART (Low-power UART) peripheral is just like ordinary U(S)ART
which lives in a separate clock/power domain.
Therefore already existing code could be reused as is
almost entirely.

Signed-off-by: Ilya Tagunov <tagunil@gmail.com>
This commit is contained in:
Ilya Tagunov 2018-04-11 17:10:47 +03:00 • committed by Kumar Gala
commit 1e6d827a53
9 changed files with 132 additions and 8 deletions
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58
drivers/serial/uart_stm32.c
View file

@ -247,6 +247,37 @@ static const struct uart_driver_api uart_stm32_driver_api = {
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
static void uart_stm32_usart_set_baud_rate(struct device *dev,
u32_t clock_rate, u32_t baud_rate)
{
USART_TypeDef *UartInstance = UART_STRUCT(dev);
LL_USART_SetBaudRate(UartInstance,
clock_rate,
#ifdef USART_PRESC_PRESCALER
LL_USART_PRESCALER_DIV1,
#endif
#ifdef USART_CR1_OVER8
LL_USART_OVERSAMPLING_16,
#endif
baud_rate);
}
#if defined(CONFIG_SOC_SERIES_STM32L0X) || defined(CONFIG_SOC_SERIES_STM32L4X)
static void uart_stm32_lpuart_set_baud_rate(struct device *dev,
u32_t clock_rate, u32_t baud_rate)
{
USART_TypeDef *UartInstance = UART_STRUCT(dev);
LL_LPUART_SetBaudRate(UartInstance,
clock_rate,
#ifdef USART_PRESC_PRESCALER
LL_USART_PRESCALER_DIV1,
#endif
baud_rate);
}
#endif
/**
* @brief Initialize UART channel
*
@ -263,6 +294,7 @@ static int uart_stm32_init(struct device *dev)
struct uart_stm32_data *data = DEV_DATA(dev);
USART_TypeDef *UartInstance = UART_STRUCT(dev);
u32_t baud_rate = config->baud_rate;
u32_t clock_rate;
__uart_stm32_get_clock(dev);
@ -287,15 +319,15 @@ static int uart_stm32_init(struct device *dev)
(clock_control_subsys_t *)&config->pclken,
&clock_rate);
LL_USART_SetBaudRate(UartInstance,
clock_rate,
#ifdef USART_PRESC_PRESCALER
LL_USART_PRESCALER_DIV1,
#if defined(CONFIG_SOC_SERIES_STM32L0X) || defined(CONFIG_SOC_SERIES_STM32L4X)
if (IS_LPUART_INSTANCE(UartInstance)) {
uart_stm32_lpuart_set_baud_rate(dev, clock_rate, baud_rate);
} else {
uart_stm32_usart_set_baud_rate(dev, clock_rate, baud_rate);
}
#else
uart_stm32_usart_set_baud_rate(dev, clock_rate, baud_rate);
#endif
#ifdef USART_CR1_OVER8
LL_USART_OVERSAMPLING_16,
#endif
config->baud_rate);
LL_USART_Enable(UartInstance);
@ -417,6 +449,10 @@ STM32_UART_INIT(USART_4, STM32_CLOCK_BUS_APB1, LL_APB1_GRP1_PERIPH_USART4)
STM32_UART_INIT(USART_5, STM32_CLOCK_BUS_APB1, LL_APB1_GRP1_PERIPH_USART5)
#endif /* CONFIG_UART_STM32_PORT_5 */
#ifdef CONFIG_UART_STM32_LPUART_1
STM32_UART_INIT(LPUART_1, STM32_CLOCK_BUS_APB1, LL_APB1_GRP1_PERIPH_LPUART1)
#endif /* CONFIG_UART_STM32_LPUART_1 */
#else
#ifdef CONFIG_UART_STM32_PORT_1
@ -459,4 +495,10 @@ STM32_UART_INIT(UART_9, STM32_CLOCK_BUS_APB2, LL_APB2_GRP1_PERIPH_UART9)
STM32_UART_INIT(UART_10, STM32_CLOCK_BUS_APB2, LL_APB2_GRP1_PERIPH_UART10)
#endif /* CONFIG_UART_STM32_PORT_10 */
#ifdef CONFIG_SOC_SERIES_STM32L4X
#ifdef CONFIG_UART_STM32_LPUART_1
STM32_UART_INIT(LPUART_1, STM32_CLOCK_BUS_APB1_2, LL_APB1_GRP2_PERIPH_LPUART1)
#endif /* CONFIG_UART_STM32_LPUART_1 */
#endif /* CONFIG_SOC_SERIES_STM32L4X */
#endif