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[U(S)ART] hardware flow control support #1634

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Merged
merged 6 commits into from
Feb 2, 2022
Merged

[U(S)ART] hardware flow control support #1634

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31937c2
Add RTS/CTS configuration interface
akasona Jan 25, 2022
16ac042
Implement UART flow control configuration
akasona Jan 25, 2022
54581cf
Implement RTS/CTS pin name validation
akasona Jan 25, 2022
0049c76
Merge all pins' peripherals explicitly
akasona Jan 29, 2022
1a91670
Add constructor with RTS/CTS parameters
akasona Jan 29, 2022
7ff51aa
Reduce repeated constructor definition
akasona Jan 31, 2022
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15 changes: 14 additions & 1 deletion libraries/SrcWrapper/src/stm32/uart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,8 @@ void uart_init(serial_t *obj, uint32_t baudrate, uint32_t databits, uint32_t par
/* Determine the U(S)ART peripheral to use (USART1, USART2, ...) */
USART_TypeDef *uart_tx = pinmap_peripheral(obj->pin_tx, PinMap_UART_TX);
USART_TypeDef *uart_rx = pinmap_peripheral(obj->pin_rx, PinMap_UART_RX);
USART_TypeDef *uart_rts = pinmap_peripheral(obj->pin_rts, PinMap_UART_RTS);
USART_TypeDef *uart_cts = pinmap_peripheral(obj->pin_cts, PinMap_UART_CTS);

/* Pin Tx must not be NP */
if (uart_tx == NP) {
Expand Down Expand Up @@ -290,6 +292,17 @@ void uart_init(serial_t *obj, uint32_t baudrate, uint32_t databits, uint32_t par
pinmap_pinout(obj->pin_rx, PinMap_UART_RX);
}

/* Configure flow control */
uint32_t flow_control = UART_HWCONTROL_NONE;
if (uart_rts != NP) {
flow_control |= UART_HWCONTROL_RTS;
pinmap_pinout(obj->pin_rts, PinMap_UART_RTS);
}
if (uart_cts != NP) {
flow_control |= UART_HWCONTROL_CTS;
pinmap_pinout(obj->pin_cts, PinMap_UART_CTS);
}

/* Configure uart */
uart_handlers[obj->index] = huart;
huart->Instance = (USART_TypeDef *)(obj->uart);
Expand All @@ -298,7 +311,7 @@ void uart_init(serial_t *obj, uint32_t baudrate, uint32_t databits, uint32_t par
huart->Init.StopBits = stopbits;
huart->Init.Parity = parity;
huart->Init.Mode = UART_MODE_TX_RX;
huart->Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart->Init.HwFlowCtl = flow_control;
huart->Init.OverSampling = UART_OVERSAMPLING_16;
#if !defined(STM32F1xx) && !defined(STM32F2xx) && !defined(STM32F4xx)\
&& !defined(STM32L1xx)
Expand Down