drivers: serial: stm32: add serial hw flow control
Adds RTS CTS hardware flow control support. Signed-off-by: Georgij Cernysiov <g.cernysiov@elco-automation.de>
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1 changed files with 61 additions and 4 deletions
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@ -7,7 +7,9 @@
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/**
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* @brief Driver for UART port on STM32 family processor.
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*
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* @note LPUART and U(S)ART have the same base and
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* majority of operations are performed the same way.
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* Please validate for newly added series.
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*/
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#include <kernel.h>
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@ -178,6 +180,20 @@ static inline u32_t uart_stm32_get_databits(struct device *dev)
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#endif /* CONFIG_LPUART_1 */
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}
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static inline void uart_stm32_set_hwctrl(struct device *dev, u32_t hwctrl)
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{
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USART_TypeDef *UartInstance = UART_STRUCT(dev);
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LL_USART_SetHWFlowCtrl(UartInstance, hwctrl);
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}
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static inline u32_t uart_stm32_get_hwctrl(struct device *dev)
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{
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USART_TypeDef *UartInstance = UART_STRUCT(dev);
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return LL_USART_GetHWFlowCtrl(UartInstance);
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}
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static inline u32_t uart_stm32_cfg2ll_parity(enum uart_config_parity parity)
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{
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switch (parity) {
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@ -274,6 +290,38 @@ static inline enum uart_config_data_bits uart_stm32_ll2cfg_databits(u32_t db)
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}
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}
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/**
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* @brief Get LL hardware flow control define from
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* Zephyr hardware flow control option.
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* @note Supports only UART_CFG_FLOW_CTRL_RTS_CTS.
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* @param fc: Zephyr hardware flow control option.
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* @retval LL_USART_HWCONTROL_RTS_CTS, or LL_USART_HWCONTROL_NONE.
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*/
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static inline u32_t uart_stm32_cfg2ll_hwctrl(enum uart_config_flow_control fc)
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{
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if (fc == UART_CFG_FLOW_CTRL_RTS_CTS) {
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return LL_USART_HWCONTROL_RTS_CTS;
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}
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return LL_USART_HWCONTROL_NONE;
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}
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/**
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* @brief Get Zephyr hardware frlow control option from
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* LL hardware flow control define.
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* @note Supports only LL_USART_HWCONTROL_RTS_CTS.
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* @param fc: LL hardware frlow control definition.
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* @retval UART_CFG_FLOW_CTRL_RTS_CTS, or UART_CFG_PARITY_NONE.
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*/
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static inline enum uart_config_flow_control uart_stm32_ll2cfg_hwctrl(u32_t fc)
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{
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if (fc == LL_USART_HWCONTROL_RTS_CTS) {
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return UART_CFG_FLOW_CTRL_RTS_CTS;
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}
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return UART_CFG_PARITY_NONE;
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}
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static int uart_stm32_configure(struct device *dev,
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const struct uart_config *cfg)
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{
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@ -282,6 +330,7 @@ static int uart_stm32_configure(struct device *dev,
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const u32_t parity = uart_stm32_cfg2ll_parity(cfg->parity);
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const u32_t stopbits = uart_stm32_cfg2ll_stopbits(cfg->stop_bits);
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const u32_t databits = uart_stm32_cfg2ll_databits(cfg->data_bits);
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const u32_t flowctrl = uart_stm32_cfg2ll_hwctrl(cfg->flow_ctrl);
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/* Hardware doesn't support mark or space parity */
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if ((UART_CFG_PARITY_MARK == cfg->parity) ||
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@ -321,9 +370,12 @@ static int uart_stm32_configure(struct device *dev,
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return -ENOTSUP;
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}
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/* Driver currently doesn't support line ctrl */
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/* Driver supports only RTS CTS flow control */
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if (UART_CFG_FLOW_CTRL_NONE != cfg->flow_ctrl) {
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return -ENOTSUP;
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if (!IS_UART_HWFLOW_INSTANCE(UartInstance) ||
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UART_CFG_FLOW_CTRL_RTS_CTS != cfg->flow_ctrl) {
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return -ENOTSUP;
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}
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}
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LL_USART_Disable(UartInstance);
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@ -340,6 +392,10 @@ static int uart_stm32_configure(struct device *dev,
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uart_stm32_set_databits(dev, databits);
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}
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if (flowctrl != uart_stm32_get_hwctrl(dev)) {
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uart_stm32_set_hwctrl(dev, flowctrl);
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}
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if (cfg->baudrate != data->baud_rate) {
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uart_stm32_set_baudrate(dev, cfg->baudrate);
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data->baud_rate = cfg->baudrate;
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@ -359,7 +415,8 @@ static int uart_stm32_config_get(struct device *dev, struct uart_config *cfg)
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uart_stm32_get_stopbits(dev));
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cfg->data_bits = uart_stm32_ll2cfg_databits(
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uart_stm32_get_databits(dev));
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cfg->flow_ctrl = UART_CFG_FLOW_CTRL_NONE;
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cfg->flow_ctrl = uart_stm32_ll2cfg_hwctrl(
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uart_stm32_get_hwctrl(dev));
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return 0;
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}
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