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Additional stm32/usart.c functions to enable/disable Rx/Tx

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interrupts, return a status flag and check for interrupt source.
This commit is contained in:
Ken Sarkies
2012-10-10 21:37:39 +10:30
committed by Piotr Esden-Tempski
parent 6ee8e44bd7
commit c4b7e2a76a
2 changed files with 92 additions and 0 deletions
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6
include/libopencm3/stm32/usart.h
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@@ -367,6 +367,12 @@ void usart_enable_rx_dma(u32 usart);
void usart_disable_rx_dma(u32 usart);
void usart_enable_tx_dma(u32 usart);
void usart_disable_tx_dma(u32 usart);
void usart_enable_rx_interrupt(u32 usart);
void usart_disable_rx_interrupt(u32 usart);
void usart_enable_tx_interrupt(u32 usart);
void usart_disable_tx_interrupt(u32 usart);
bool usart_get_flag(u32 usart, u32 flag);
bool usart_get_interrupt_source(u32 usart, u32 flag);
END_DECLS

86
lib/stm32/usart.c
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@@ -353,6 +353,92 @@ void usart_disable_tx_dma(u32 usart)
USART_CR3(usart) &= ~USART_CR3_DMAT;
}
/*-----------------------------------------------------------------------------*/
/** @brief USART Receiver Interrupt Enable.
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
*/
void usart_enable_rx_interrupt(u32 usart)
{
USART_CR1(usart) |= USART_CR1_RXNEIE;
}
/*-----------------------------------------------------------------------------*/
/** @brief USART Receiver Interrupt Disable.
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
*/
void usart_disable_rx_interrupt(u32 usart)
{
USART_CR1(usart) &= ~USART_CR1_RXNEIE;
}
/*-----------------------------------------------------------------------------*/
/** @brief USART Transmitter Interrupt Enable.
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
*/
void usart_enable_tx_interrupt(u32 usart)
{
USART_CR1(usart) |= USART_CR1_TXEIE;
}
/*-----------------------------------------------------------------------------*/
/** @brief USART Transmitter Interrupt Disable.
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
*/
void usart_disable_tx_interrupt(u32 usart)
{
USART_CR1(usart) &= ~USART_CR1_TXEIE;
}
/*---------------------------------------------------------------------------*/
/** @brief USART Read a Status Flag.
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
@param[in] flag Unsigned int32. Status register flag @ref usart_sr_flags.
@returns boolean: flag set.
*/
bool usart_get_flag(u32 usart, u32 flag)
{
return ((USART_SR(usart) & flag) != 0);
}
/*---------------------------------------------------------------------------*/
/** @brief USART Return Interrupt Source.
Returns true if the specified interrupt flag (IDLE, RXNE, TC, TXE or OE) was
set and the interrupt was enabled. If the specified flag is not an interrupt
flag, the function returns false.
@todo These are the most important interrupts likely to be used. Others
relating to LIN break, and error conditions in multibuffer communication, need
to be added for completeness.
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
@param[in] flag Unsigned int32. Status register flag @ref usart_sr_flags.
@returns boolean: flag and interrupt enable both set.
*/
bool usart_get_interrupt_source(u32 usart, u32 flag)
{
u32 flag_set = (USART_SR(usart) & flag);
/* IDLE, RXNE, TC, TXE interrupts */
if ((flag >= USART_SR_IDLE) && (flag <= USART_SR_TXE))
return ((flag_set & USART_CR1(usart)) != 0);
/* Overrun error */
else if (flag == USART_SR_ORE)
return (flag_set && (USART_CR3(usart) & USART_CR3_CTSIE));
return (false);
}
/**@}*/