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cpu/stm32_common: add UART HW flow control

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This commit is contained in:
Vincent Dupont 2017-01-05 14:22:02 +01:00
parent 1af1727759
commit a8da073f51
2 changed files with 27 additions and 0 deletions
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8
cpu/stm32_common/include/periph_cpu_common.h
View File

@ -186,6 +186,14 @@ typedef struct {
uint8_t dma_stream; /**< DMA stream used for TX */
uint8_t dma_chan; /**< DMA channel used for TX */
#endif
#ifdef UART_USE_HW_FC
gpio_t cts_pin; /**< CTS pin - set to GPIO_UNDEF when not using HW flow control */
gpio_t rts_pin; /**< RTS pin */
#ifndef CPU_FAM_STM32F1
gpio_af_t cts_af; /**< alternate function for CTS pin */
gpio_af_t rts_af; /**< alternate function for RTS pin */
#endif
#endif
} uart_conf_t;
/**

19
cpu/stm32_common/periph/uart.c
View File

@ -72,6 +72,18 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
gpio_init_af(uart_config[uart].rx_pin, uart_config[uart].rx_af);
#endif
}
#ifdef UART_USE_HW_FC
if (uart_config[uart].cts_pin != GPIO_UNDEF) {
gpio_init(uart_config[uart].cts_pin, GPIO_IN);
gpio_init(uart_config[uart].rts_pin, GPIO_OUT);
#ifdef CPU_FAM_STM32F1
gpio_init_af(uart_config[uart].rts_pin, GPIO_AF_OUT_PP);
#else
gpio_init_af(uart_config[uart].cts_pin, uart_config[uart].cts_af);
gpio_init_af(uart_config[uart].rts_pin, uart_config[uart].rts_af);
#endif
}
#endif
/* enable the clock */
periph_clk_en(uart_config[uart].bus, uart_config[uart].rcc_mask);
@ -96,6 +108,13 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
dev(uart)->CR1 = (USART_CR1_UE | USART_CR1_TE);
}
#ifdef UART_USE_HW_FC
if (uart_config[uart].cts_pin != GPIO_UNDEF) {
/* configure hardware flow control */
dev(uart)->CR3 = (USART_CR3_RTSE | USART_CR3_CTSE);
}
#endif
return UART_OK;
}