Move usart files to common area
Again added to L1 which is similar to F1
This commit is contained in:
Ken Sarkies
452
lib/stm32/common/usart_common_all.c
Normal file
452
lib/stm32/common/usart_common_all.c
Normal file
@@ -0,0 +1,452 @@
|
||||
/** @addtogroup usart_file
|
||||
|
||||
@version 1.0.0
|
||||
|
||||
@author @htmlonly © @endhtmlonly 2009 Uwe Hermann <uwe@hermann-uwe.de>
|
||||
|
||||
@date 30 August 2012
|
||||
|
||||
This library supports the USART/UART in the STM32F series
|
||||
of ARM Cortex Microcontrollers by ST Microelectronics.
|
||||
|
||||
Devices can have up to 3 USARTs and 2 UARTs.
|
||||
|
||||
LGPL License Terms @ref lgpl_license
|
||||
*/
|
||||
/*
|
||||
* This file is part of the libopencm3 project.
|
||||
*
|
||||
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
|
||||
*
|
||||
* This library is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
/**@{*/
|
||||
|
||||
#include <libopencm3/stm32/usart.h>
|
||||
#include <libopencm3/stm32/rcc.h>
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Set Baudrate.
|
||||
|
||||
The baud rate is computed from the APB high-speed prescaler clock (for USART1)
|
||||
or the APB low-speed prescaler clock (for other USARTs). These values must
|
||||
be correctly set before calling this function (refer to the rcc_clock_setup-*
|
||||
functions in RCC).
|
||||
|
||||
@todo Add support for USART6 and oversampling in F2/F4
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] baud unsigned 32 bit. Baud rate specified in Hz.
|
||||
*/
|
||||
|
||||
void usart_set_baudrate(u32 usart, u32 baud)
|
||||
{
|
||||
u32 clock = rcc_ppre1_frequency;
|
||||
|
||||
//#ifdef STM32F1
|
||||
if (usart == USART1) {
|
||||
clock = rcc_ppre2_frequency;
|
||||
}
|
||||
/* This has to be added for F2 when it get's support for USART6 */
|
||||
/*
|
||||
#else
|
||||
if ((usart == USART1) ||
|
||||
(usart == USART6)) {
|
||||
clock = rcc_ppre2_frequency;
|
||||
}
|
||||
#endif
|
||||
*/
|
||||
|
||||
/*
|
||||
* Yes it is as simple as that. The reference manual is
|
||||
* talking about fractional calculation but it seems to be only
|
||||
* marketting babble to sound awesome. It is nothing else but a
|
||||
* simple divider to generate the correct baudrate.
|
||||
*
|
||||
* Note: We round() the value rather than floor()ing it, for more
|
||||
* accurate divisor selection.
|
||||
*/
|
||||
USART_BRR(usart) = ((2 * clock) + baud) / (2 * baud);
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Set Word Length.
|
||||
|
||||
The word length is set to 8 or 9 bits. Note that the last bit will be a parity bit
|
||||
if parity is enabled, in which case the data length will be 7 or 8 bits respectively.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] bits unsigned 32 bit. Word length in bits 8 or 9.
|
||||
*/
|
||||
|
||||
void usart_set_databits(u32 usart, u32 bits)
|
||||
{
|
||||
if (bits == 8)
|
||||
USART_CR1(usart) &= ~USART_CR1_M; /* 8 data bits */
|
||||
else
|
||||
USART_CR1(usart) |= USART_CR1_M; /* 9 data bits */
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Set Stop Bit(s).
|
||||
|
||||
The stop bits are specified as 0.5, 1, 1.5 or 2.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] stopbits unsigned 32 bit. Stop bits @ref usart_cr2_stopbits.
|
||||
*/
|
||||
|
||||
void usart_set_stopbits(u32 usart, u32 stopbits)
|
||||
{
|
||||
u32 reg32;
|
||||
|
||||
reg32 = USART_CR2(usart);
|
||||
reg32 = (reg32 & ~USART_CR2_STOPBITS_MASK) | stopbits;
|
||||
USART_CR2(usart) = reg32;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Set Parity.
|
||||
|
||||
The parity bit can be selected as none, even or odd.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] parity unsigned 32 bit. Parity @ref usart_cr1_parity.
|
||||
*/
|
||||
|
||||
void usart_set_parity(u32 usart, u32 parity)
|
||||
{
|
||||
u32 reg32;
|
||||
|
||||
reg32 = USART_CR1(usart);
|
||||
reg32 = (reg32 & ~USART_PARITY_MASK) | parity;
|
||||
USART_CR1(usart) = reg32;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Set Rx/Tx Mode.
|
||||
|
||||
The mode can be selected as Rx only, Tx only or Rx+Tx.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] mode unsigned 32 bit. Mode @ref usart_cr1_mode.
|
||||
*/
|
||||
|
||||
void usart_set_mode(u32 usart, u32 mode)
|
||||
{
|
||||
u32 reg32;
|
||||
|
||||
reg32 = USART_CR1(usart);
|
||||
reg32 = (reg32 & ~USART_MODE_MASK) | mode;
|
||||
USART_CR1(usart) = reg32;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Set Hardware Flow Control.
|
||||
|
||||
The flow control bit can be selected as none, RTS, CTS or RTS+CTS.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] flowcontrol unsigned 32 bit. Flowcontrol @ref usart_cr3_flowcontrol.
|
||||
*/
|
||||
|
||||
void usart_set_flow_control(u32 usart, u32 flowcontrol)
|
||||
{
|
||||
u32 reg32;
|
||||
|
||||
reg32 = USART_CR3(usart);
|
||||
reg32 = (reg32 & ~USART_FLOWCONTROL_MASK) | flowcontrol;
|
||||
USART_CR3(usart) = reg32;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Enable.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_enable(u32 usart)
|
||||
{
|
||||
USART_CR1(usart) |= USART_CR1_UE;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Disable.
|
||||
|
||||
At the end of the current frame, the USART is disabled to reduce power.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_disable(u32 usart)
|
||||
{
|
||||
USART_CR1(usart) &= ~USART_CR1_UE;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Send a Data Word.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] data unsigned 16 bit.
|
||||
*/
|
||||
|
||||
void usart_send(u32 usart, u16 data)
|
||||
{
|
||||
/* Send data. */
|
||||
USART_DR(usart) = (data & USART_DR_MASK);
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Read a Received Data Word.
|
||||
|
||||
If parity is enabled the MSB (bit 7 or 8 depending on the word length) is the parity bit.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@returns unsigned 16 bit data word.
|
||||
*/
|
||||
|
||||
u16 usart_recv(u32 usart)
|
||||
{
|
||||
/* Receive data. */
|
||||
return USART_DR(usart) & USART_DR_MASK;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Wait for Transmit Data Buffer Empty
|
||||
|
||||
Blocks until the transmit data buffer becomes empty and is ready to accept the
|
||||
next data word.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_wait_send_ready(u32 usart)
|
||||
{
|
||||
/* Wait until the data has been transferred into the shift register. */
|
||||
while ((USART_SR(usart) & USART_SR_TXE) == 0);
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Wait for Received Data Available
|
||||
|
||||
Blocks until the receive data buffer holds a valid received data word.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_wait_recv_ready(u32 usart)
|
||||
{
|
||||
/* Wait until the data is ready to be received. */
|
||||
while ((USART_SR(usart) & USART_SR_RXNE) == 0);
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Send Data Word with Blocking
|
||||
|
||||
Blocks until the transmit data buffer becomes empty then writes the next data word
|
||||
for transmission.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@param[in] data unsigned 16 bit.
|
||||
*/
|
||||
|
||||
void usart_send_blocking(u32 usart, u16 data)
|
||||
{
|
||||
usart_wait_send_ready(usart);
|
||||
usart_send(usart, data);
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Read a Received Data Word with Blocking.
|
||||
|
||||
Wait until a data word has been received then return the word.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
@returns unsigned 16 bit data word.
|
||||
*/
|
||||
|
||||
u16 usart_recv_blocking(u32 usart)
|
||||
{
|
||||
usart_wait_recv_ready(usart);
|
||||
|
||||
return usart_recv(usart);
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Receiver DMA Enable.
|
||||
|
||||
DMA is available on:
|
||||
@li USART1 Rx DMA1 channel 5.
|
||||
@li USART2 Rx DMA1 channel 6.
|
||||
@li USART3 Rx DMA1 channel 3.
|
||||
@li UART4 Rx DMA2 channel 3.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_enable_rx_dma(u32 usart)
|
||||
{
|
||||
USART_CR3(usart) |= USART_CR3_DMAR;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Receiver DMA Disable.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_disable_rx_dma(u32 usart)
|
||||
{
|
||||
USART_CR3(usart) &= ~USART_CR3_DMAR;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Transmitter DMA Enable.
|
||||
|
||||
DMA is available on:
|
||||
@li USART1 Tx DMA1 channel 4.
|
||||
@li USART2 Tx DMA1 channel 7.
|
||||
@li USART3 Tx DMA1 channel 2.
|
||||
@li UART4 Tx DMA2 channel 5.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_enable_tx_dma(u32 usart)
|
||||
{
|
||||
USART_CR3(usart) |= USART_CR3_DMAT;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Transmitter DMA Disable.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
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 Error Interrupt Enable.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_enable_error_interrupt(u32 usart)
|
||||
{
|
||||
USART_CR3(usart) |= USART_CR3_EIE;
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------*/
|
||||
/** @brief USART Error Interrupt Disable.
|
||||
|
||||
@param[in] usart unsigned 32 bit. USART block register address base @ref usart_reg_base
|
||||
*/
|
||||
|
||||
void usart_disable_error_interrupt(u32 usart)
|
||||
{
|
||||
USART_CR3(usart) &= ~USART_CR3_EIE;
|
||||
}
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/** @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);
|
||||
}
|
||||
|
||||
/**@}*/
|
||||
|
||||
Reference in New Issue
Block a user