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FuriHal: Serial hardware flow control? #4142

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FuriHal: Serial hardware flow control? #4142

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1 change: 1 addition & 0 deletions targets/f7/api_symbols.csv
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Original file line number Diff line number Diff line change
Expand Up @@ -1628,6 +1628,7 @@ Function,+,furi_hal_serial_async_rx,uint8_t,FuriHalSerialHandle*
Function,+,furi_hal_serial_async_rx_available,_Bool,FuriHalSerialHandle*
Function,+,furi_hal_serial_async_rx_start,void,"FuriHalSerialHandle*, FuriHalSerialAsyncRxCallback, void*, _Bool"
Function,+,furi_hal_serial_async_rx_stop,void,FuriHalSerialHandle*
Function,+,furi_hal_serial_configure_flow_control,void,"FuriHalSerialHandle*, _Bool, _Bool"
Function,+,furi_hal_serial_configure_framing,void,"FuriHalSerialHandle*, FuriHalSerialDataBits, FuriHalSerialParity, FuriHalSerialStopBits"
Function,+,furi_hal_serial_control_acquire,FuriHalSerialHandle*,FuriHalSerialId
Function,+,furi_hal_serial_control_deinit,void,
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52 changes: 52 additions & 0 deletions targets/f7/furi_hal/furi_hal_serial.c
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Original file line number Diff line number Diff line change
Expand Up @@ -691,6 +691,58 @@ void furi_hal_serial_configure_framing(
}
}

static void furi_hal_serial_usart_configure_flow_control(bool rts, bool cts) {
uint32_t flow_control;
if(rts && cts) {
flow_control = LL_USART_HWCONTROL_RTS_CTS;
} else if(rts) {
flow_control = LL_USART_HWCONTROL_RTS;
} else if(cts) {
flow_control = LL_USART_HWCONTROL_CTS;
} else {
flow_control = LL_USART_HWCONTROL_NONE;
}
LL_USART_SetHWFlowCtrl(USART1, flow_control);
}

static void furi_hal_serial_lpuart_configure_flow_control(bool rts, bool cts) {
uint32_t flow_control;
if(rts && cts) {
flow_control = LL_LPUART_HWCONTROL_RTS_CTS;
} else if(rts) {
flow_control = LL_LPUART_HWCONTROL_RTS;
} else if(cts) {
flow_control = LL_LPUART_HWCONTROL_CTS;
} else {
flow_control = LL_LPUART_HWCONTROL_NONE;
}
LL_USART_SetHWFlowCtrl(LPUART1, flow_control);
}

void furi_hal_serial_configure_flow_control(FuriHalSerialHandle* handle, bool rts, bool cts) {
furi_check(handle);

if(handle->id == FuriHalSerialIdUsart) {
if(LL_USART_IsEnabled(USART1)) {
// Wait for transfer complete flag
while(!LL_USART_IsActiveFlag_TC(USART1))
;
LL_USART_Disable(USART1);
furi_hal_serial_usart_configure_flow_control(rts, cts);
LL_USART_Enable(USART1);
}
} else if(handle->id == FuriHalSerialIdLpuart) {
if(LL_LPUART_IsEnabled(LPUART1)) {
// Wait for transfer complete flag
while(!LL_LPUART_IsActiveFlag_TC(LPUART1))
;
LL_LPUART_Disable(LPUART1);
furi_hal_serial_lpuart_configure_flow_control(rts, cts);
LL_LPUART_Enable(LPUART1);
}
}
}

void furi_hal_serial_deinit(FuriHalSerialHandle* handle) {
furi_check(handle);
furi_hal_serial_async_rx_configure(handle, NULL, NULL);
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9 changes: 9 additions & 0 deletions targets/f7/furi_hal/furi_hal_serial.h
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,15 @@ void furi_hal_serial_configure_framing(
FuriHalSerialParity parity,
FuriHalSerialStopBits stop_bits);

/**
* @brief Configures hardware flow control of a serial interface
*
* @param handle Serial handle
* @param rts Whether to enable RTS (Request To Send)
* @param cts Whether to enable CTS (Clear To Send)
*/
void furi_hal_serial_configure_flow_control(FuriHalSerialHandle* handle, bool rts, bool cts);

/** Transmits data in semi-blocking mode
*
* Fills transmission pipe with data, returns as soon as all bytes from buffer
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