Add uart init logic
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2982 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
parent
470ddbac2b
commit
b2aac9211a
@ -109,6 +109,16 @@
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# undef HAVE_SERIAL_CONSOLE
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#endif
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/* Determine which (if any) console driver to use */
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#if CONFIG_NFILE_DESCRIPTORS == 0 || defined(CONFIG_DEV_LOWCONSOLE) || !defined(HAVE_RS232_DEVICE)
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# undef CONFIG_USE_SERIALDRIVER
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# undef CONFIG_USE_EARLYSERIALINIT
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#elif defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS > 0
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# define CONFIG_USE_SERIALDRIVER 1
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# define CONFIG_USE_EARLYSERIALINIT 1
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#endif
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/************************************************************************************
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* Public Types
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************************************************************************************/
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@ -42,6 +42,9 @@
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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@ -68,11 +71,34 @@
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extern void up_clkinitialize(void);
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/******************************************************************************
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* Name: usart_reset
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*
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* Description:
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* Reset a USART.
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*
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******************************************************************************/
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extern void usart_reset(uintptr_t usart_base);
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/******************************************************************************
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* Name: usart_configure
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*
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* Description:
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* Configure a USART as a RS-232 UART.
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*
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******************************************************************************/
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void usart_configure(uintptr_t usart_base, uint32_t baud, unsigned int parity,
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unsigned int nbits, bool stop2);
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/************************************************************************************
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* Name: up_consoleinit
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*
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* Description:
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* Initialize a console for debug output.
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* Initialize a console for debug output. This function is called very
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* early in the intialization sequence to configure the serial console uart
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* (only).
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*
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************************************************************************************/
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@ -1,4 +1,4 @@
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/**************************************************************************
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/******************************************************************************
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* arch/avr/src/at91uc3/at91uc3_lowconsole.c
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*
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* Copyright (C) 2010 Gregory Nutt. All rights reserved.
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@ -31,75 +31,300 @@
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************/
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******************************************************************************/
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/**************************************************************************
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/******************************************************************************
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* Included Files
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**************************************************************************/
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******************************************************************************/
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#include <nuttx/config.h>
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#include "at91uc3_config.h"
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#include <assert.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "at91uc3_internal.h"
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#include "at91uc3_usart.h"
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/**************************************************************************
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/******************************************************************************
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* Private Definitions
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**************************************************************************/
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******************************************************************************/
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/**************************************************************************
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/* Select USART parameters for the selected console */
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#if defined(CONFIG_USART0_SERIAL_CONSOLE)
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# define AVR32_CONSOLE_BASE AVR32_USART0_BASE
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# define AVR32_CONSOLE_BAUD CONFIG_USART0_BAUD
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# define AVR32_CONSOLE_BITS CONFIG_USART0_BITS
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# define AVR32_CONSOLE_PARITY CONFIG_USART0_PARITY
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# define AVR32_CONSOLE_2STOP CONFIG_USART0_2STOP
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#elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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# define AVR32_CONSOLE_BASE AVR32_USART1_BASE
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# define AVR32_CONSOLE_BAUD CONFIG_USART1_BAUD
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# define AVR32_CONSOLE_BITS CONFIG_USART1_BITS
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# define AVR32_CONSOLE_PARITY CONFIG_USART1_PARITY
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# define AVR32_CONSOLE_2STOP CONFIG_USART1_2STOP
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#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
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# define AVR32_CONSOLE_BASE AVR32_USART2_BASE
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# define AVR32_CONSOLE_BAUD CONFIG_USART2_BAUD
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# define AVR32_CONSOLE_BITS CONFIG_USART2_BITS
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# define AVR32_CONSOLE_PARITY CONFIG_USART2_PARITY
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# define AVR32_CONSOLE_2STOP CONFIG_USART2_2STOP
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#else
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# error "No CONFIG_USARTn_SERIAL_CONSOLE Setting"
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#endif
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/******************************************************************************
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* Private Types
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**************************************************************************/
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******************************************************************************/
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/**************************************************************************
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/******************************************************************************
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* Private Function Prototypes
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**************************************************************************/
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******************************************************************************/
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/**************************************************************************
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/******************************************************************************
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* Global Variables
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**************************************************************************/
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******************************************************************************/
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/**************************************************************************
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/******************************************************************************
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* Private Variables
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**************************************************************************/
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******************************************************************************/
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/**************************************************************************
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/******************************************************************************
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* Private Functions
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**************************************************************************/
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******************************************************************************/
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/**************************************************************************
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/******************************************************************************
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* Name: usart_putreg
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*
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* Description:
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* Write a value to a USART register
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*
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******************************************************************************/
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#ifdef HAVE_RS232_DEVICE
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static inline void usart_putreg(uintptr_t usart_base, unsigned int offset, uint32_t value)
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{
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putreg32(value, usart_base + offset);
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}
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#endif
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/******************************************************************************
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* Name: usart_getreg
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*
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* Description:
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* Get a value from a USART register
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*
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******************************************************************************/
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#ifdef HAVE_RS232_DEVICE
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static inline uint32_t usart_getreg(uintptr_t usart_base, unsigned int offset)
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{
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return getreg32(usart_base + offset);
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}
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#endif
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/******************************************************************************
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* Name: usart_setbaudrate
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*
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* Description:
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* Configure the UART baud rate.
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*
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******************************************************************************/
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#ifdef HAVE_RS232_DEVICE
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static void usart_setbaudrate(uintptr_t usart_base, uint32_t baudrate)
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{
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uint32_t cd;
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uint32_t mr;
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/* Select 16x or 8x oversampling mode or go to synchronous mode */
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mr = usart_getreg(usart_base, AVR32_USART_MR_OFFSET);
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if (baudrate < AVR32_PBA_CLOCK / 16)
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{
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/* Select 16x oversampling mode and clear the SYNC mode bit */
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mr &= ~(USART_MR_OVER|USART_MR_SYNC);
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/* Calculate the clock divider assuming 16x oversampling */
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cd = (AVR32_PBA_CLOCK + (baudrate << 3)) / (baudrate << 4);
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}
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else if (baudrate < AVR32_PBA_CLOCK / 8)
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{
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/* Select 8x oversampling mode and clear the SYNC mode bit */
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mr &= ~USART_MR_SYNC;
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mr |= USART_MR_OVER;
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/* Calculate the clock divider assuming 16x oversampling */
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cd = (AVR32_PBA_CLOCK + (baudrate << 2)) / (baudrate << 3);
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}
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else
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{
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/* Set the SYNC mode bit */
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mr |= USART_MR_SYNC;
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/* Use the undivided PBA clock */
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cd = AVR32_PBA_CLOCK / baudrate;
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}
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DEBUGASSERT(cd > 0 && cd < 65536);
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usart_putreg(usart_base, AVR32_USART_MR_OFFSET, mr);
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usart_putreg(usart_base, AVR32_USART_BRGR_OFFSET, cd);
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}
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#endif
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/******************************************************************************
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* Public Functions
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**************************************************************************/
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******************************************************************************/
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/************************************************************************************
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/******************************************************************************
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* Name: usart_reset
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*
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* Description:
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* Reset a USART.
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*
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******************************************************************************/
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#ifdef HAVE_RS232_DEVICE
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void usart_reset(uintptr_t usart_base)
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{
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irqstate_t flags;
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/* Disable all USART interrupts */
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flags = irqsave();
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usart_putreg(usart_base, AVR32_USART_IDR_OFFSET, 0xffffffff);
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irqrestore(flags);
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/* Reset mode and other registers */
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usart_putreg(usart_base, AVR32_USART_MR_OFFSET, 0); /* Reset mode register */
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usart_putreg(usart_base, AVR32_USART_RTOR_OFFSET, 0); /* Reset receiver timeout register */
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usart_putreg(usart_base, AVR32_USART_TTGR_OFFSET, 0); /* Reset transmitter timeguard reg */
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/* Disable RX and TX, put USART in reset, disable handshaking signals */
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usart_putreg(usart_base, AVR32_USART_CR_OFFSET,
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USART_CR_RSTRX|USART_CR_RSTTX|USART_CR_RSTSTA|USART_CR_RSTIT|
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USART_CR_RSTNACK|USART_CR_DTRDIS|USART_CR_RTSDIS);
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}
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#endif
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/******************************************************************************
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* Name: usart_configure
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*
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* Description:
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* Configure a USART as a RS-232 UART.
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*
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******************************************************************************/
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#ifdef HAVE_RS232_DEVICE
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void usart_configure(uintptr_t usart_base, uint32_t baud, unsigned int parity,
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unsigned int nbits, bool stop2)
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{
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uint32_t regval;
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/* Reset the USART and disable RX and TX */
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usart_reset(usart_base);
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/* Set the baud rate generation register */
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usart_setbaudrate(usart_base, baud);
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/* Configure STOP bits */
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regval = USART_MR_MODE_NORMAL|USART_MR_CHMODE_NORMAL; /* Normal RS-232 mode */
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regval |= stop2 ? USART_MR_NBSTOP_2 : USART_MR_NBSTOP_1;
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/* Configure parity */
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switch (parity)
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{
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case 0:
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default:
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regval |= USART_MR_PAR_NONE;
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break;
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case 1:
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regval |= USART_MR_PAR_ODD;
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break;
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case 2:
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regval |= USART_MR_PAR_EVEN;
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break;
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}
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/* Configure the number of bits per word */
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DEBUGASSERT(nbits >= 5 && nbits <= 9);
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if (nbits == 9)
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{
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regval |= USART_MR_MODE9;
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}
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else
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{
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regval |= USART_MR_CHRL_BITS(nbits);
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}
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usart_putreg(usart_base, AVR32_USART_MR_OFFSET, regval);
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/* Enable RX and TX */
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regval = usart_getreg(usart_base, AVR32_USART_CR_OFFSET);
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regval |= (USART_CR_RXEN|USART_CR_TXEN);
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usart_putreg(usart_base, AVR32_USART_CR_OFFSET, regval);
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}
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#endif
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/******************************************************************************
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* Name: up_consoleinit
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*
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* Description:
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* Initialize a console for debug output.
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* Initialize a console for debug output. This function is called very
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* early in the intialization sequence to configure the serial console uart
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* (only).
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*
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************************************************************************************/
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******************************************************************************/
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void up_consoleinit(void)
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{
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#warning "Not Implemented"
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#ifdef HAVE_SERIAL_CONSOLE
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usart_configure(AVR32_CONSOLE_BASE, AVR32_CONSOLE_BAUD, AVR32_CONSOLE_PARITY,
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AVR32_CONSOLE_BITS, (bool)AVR32_CONSOLE_2STOP);
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# warning "Probably not all Implemented"
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#endif
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}
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/************************************************************************************
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/******************************************************************************
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* Name: up_lowputc
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*
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* Description:
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* Output one byte on the serial console
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*
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************************************************************************************/
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******************************************************************************/
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void up_lowputc(char ch)
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{
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#ifdef HAVE_SERIAL_CONSOLE
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/* Wait until the TX data register is empty */
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#warning "Not Implemented"
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/* Wait until the TX to become ready */
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while (usart_getreg(AVR32_CONSOLE_BASE, USART_CSR_TXRDY) == 0);
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/* Then send the character */
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#warning "Not Implemented"
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usart_putreg(AVR32_CONSOLE_BASE, AVR32_USART_THR_OFFSET, (uint32_t)ch);
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#endif
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}
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@ -87,7 +87,7 @@ void up_lowinit(void)
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up_clkinitialize();
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/* Initialize a console */
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/* Initialize a console (probably a serial console) */
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up_consoleinit();
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@ -95,7 +95,7 @@ void up_lowinit(void)
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* available as soon as possible).
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*/
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#ifdef CONFIG_USE_SERIALDRIVER
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#ifdef CONFIG_USE_EARLYSERIALINIT
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up_earlyserialinit();
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#endif
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@ -143,14 +143,14 @@
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struct up_dev_s
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{
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uint32_t usartbase; /* Base address of USART registers */
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uint32_t baud; /* Configured baud */
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uint32_t ie; /* Saved interrupt mask bits value */
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uint32_t sr; /* Saved status bits */
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uint8_t irq; /* IRQ associated with this USART */
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uint8_t parity; /* 0=none, 1=odd, 2=even */
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uint8_t bits; /* Number of bits (7 or 8) */
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bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
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uintptr_t usartbase; /* Base address of USART registers */
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uint32_t baud; /* Configured baud */
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uint32_t ie; /* Saved interrupt mask bits value */
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uint32_t sr; /* Saved status bits */
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uint8_t irq; /* IRQ associated with this USART */
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uint8_t parity; /* 0=none, 1=odd, 2=even */
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uint8_t bits; /* Number of bits (7 or 8) */
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bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
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};
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/****************************************************************************
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@ -361,78 +361,12 @@ static inline void up_disableusartint(struct up_dev_s *priv, uint16_t *ie)
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static int up_setup(struct uart_dev_s *dev)
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{
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struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
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#ifdef CONFIG_SUPPRESS_UART_CONFIG
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uint32_t regval;
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/* Configure the USART as an RS-232 UART */
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/* Configure STOP bits */
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regval = uUSART_MR_MODE_NORMAL;
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if (priv->stopbits2)
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{
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regval |= USART_MR_NBSTOP_2;
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}
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else
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{
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regval |= USART_MR_NBSTOP_1;
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}
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/* Configure parity */
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switch (priv->parity)
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{
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case 0:
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default:
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regval |= USART_MR_PAR_NONE;
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break;
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case 1:
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regval |= USART_MR_PAR_ODD;
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break;
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case 2:
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regval |= USART_MR_PAR_EVEN;
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break;
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}
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/* Configure the number of bits per word */
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switch (priv->bits)
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{
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case 5:
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regval |= USART_MR_CHRL_5BITS;
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break;
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case 6:
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regval |= USART_MR_CHRL_6BITS;
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break;
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case 7:
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regval |= USART_MR_CHRL_7BITS;
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break;
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case 8:
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default:
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regval |= USART_MR_CHRL_8BITS;
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break;
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case 9:
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regval |= USART_MR_MODE9;
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break;
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}
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regval = up_serialout(priv, AVR32_USART_MR_OFFSET, regval);
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/* Disable interrupts at the UART */
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#warning "Not Implemented"
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/* Configure hardware flow control -- Not yet supported */
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#warning "Not Implemented"
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/* Configure the USART Baud Rate */
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#warning "Not Implemented"
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/* Enable Rx, Tx, and the USART */
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#warning "Not Implemented"
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usart_configure(priv->usartbase, priv->baud, priv->parity,
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priv->bits, priv->stopbits2);
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#endif
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/* Initialize the IMR shadow register */
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@ -453,15 +387,10 @@ static int up_setup(struct uart_dev_s *dev)
|
||||
static void up_shutdown(struct uart_dev_s *dev)
|
||||
{
|
||||
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
|
||||
uint32_t regval;
|
||||
|
||||
/* Disable all interrupts */
|
||||
/* Reset, disable interrupts, and disable Rx and Tx */
|
||||
|
||||
up_disableusartint(priv, NULL);
|
||||
|
||||
/* Disable Rx, Tx, and the UART */
|
||||
|
||||
#warning "Not Implemented"
|
||||
usart_reset(priv->usartbase);
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
|
||||
@ -147,13 +147,13 @@
|
||||
|
||||
#define USART_MR_MODE_SHIFT (0)
|
||||
#define USART_MR_MODE_MASK (15 << USART_MR_MODE_SHIFT)
|
||||
# define USART_MR_MODE_NORMAL (0 << USART_MR_MODE_SHIFT) /* Normal */
|
||||
# define USART_MR_MODE_RS485 (1 << USART_MR_MODE_SHIFT) /* RS485 */
|
||||
# define USART_MR_MODE_HW (2 << USART_MR_MODE_SHIFT) /* Hardware Handshaking */
|
||||
# define USART_MR_MODE_MODEM (3 << USART_MR_MODE_SHIFT) /* Modem */
|
||||
# define USART_MR_MODE_T0 (4 << USART_MR_MODE_SHIFT) /* IS07816 Protocol: T = 0 */
|
||||
# define USART_MR_MODE_T1 (6 << USART_MR_MODE_SHIFT) /* IS07816 Protocol: T = 1 */
|
||||
# define USART_MR_MODE_IRDA (8 << USART_MR_MODE_SHIFT) /* IrDA */
|
||||
# define USART_MR_MODE_NORMAL (0 << USART_MR_MODE_SHIFT) /* Normal */
|
||||
# define USART_MR_MODE_RS485 (1 << USART_MR_MODE_SHIFT) /* RS485 */
|
||||
# define USART_MR_MODE_HW (2 << USART_MR_MODE_SHIFT) /* Hardware Handshaking */
|
||||
# define USART_MR_MODE_MODEM (3 << USART_MR_MODE_SHIFT) /* Modem */
|
||||
# define USART_MR_MODE_T0 (4 << USART_MR_MODE_SHIFT) /* IS07816 Protocol: T = 0 */
|
||||
# define USART_MR_MODE_T1 (6 << USART_MR_MODE_SHIFT) /* IS07816 Protocol: T = 1 */
|
||||
# define USART_MR_MODE_IRDA (8 << USART_MR_MODE_SHIFT) /* IrDA */
|
||||
# define USART_MR_MODE_MASTER (14 << USART_MR_MODE_SHIFT) /* SPI Master */
|
||||
# define USART_MR_MODE_SLAVE (15 << USART_MR_MODE_SHIFT) /* SPI Slave */
|
||||
#define USART_MR_USCLKS_SHIFT (4) /* Bits 4-5: Clock Selection */
|
||||
@ -163,6 +163,7 @@
|
||||
# define USART_MR_USCLKS_CLK (3 << USART_MR_USCLKS_SHIFT) /* CLK */
|
||||
#define USART_MR_CHRL_SHIFT (6) /* Bit 6-7: Character Length */
|
||||
#define USART_MR_CHRL_MASK (3 << USART_MR_CHRL_SHIFT)
|
||||
# define USART_MR_CHRL_BITS(n) (((n) - 5) << USART_MR_CHRL_SHIFT)
|
||||
# define USART_MR_CHRL_5BITS (0 << USART_MR_CHRL_SHIFT) /* 5 bits */
|
||||
# define USART_MR_CHRL_6BITS (1 << USART_MR_CHRL_SHIFT) /* 6 bits */
|
||||
# define USART_MR_CHRL_7BITS (2 << USART_MR_CHRL_SHIFT) /* 7 bits */
|
||||
|
||||
@ -59,16 +59,6 @@
|
||||
#undef CONFIG_SUPPRESS_UART_CONFIG /* DEFINED: Do not reconfig UART */
|
||||
#undef CONFIG_DUMP_ON_EXIT /* DEFINED: Dump task state on exit */
|
||||
|
||||
/* Determine which (if any) console driver to use */
|
||||
|
||||
#if CONFIG_NFILE_DESCRIPTORS == 0 || defined(CONFIG_DEV_LOWCONSOLE)
|
||||
# undef CONFIG_USE_SERIALDRIVER
|
||||
# undef CONFIG_USE_EARLYSERIALINIT
|
||||
#elif defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS > 0
|
||||
# define CONFIG_USE_SERIALDRIVER 1
|
||||
# define CONFIG_USE_EARLYSERIALINIT 1
|
||||
#endif
|
||||
|
||||
/* Check if an interrupt stack size is configured */
|
||||
|
||||
#ifndef CONFIG_ARCH_INTERRUPTSTACK
|
||||
|
||||
@ -48,6 +48,20 @@
|
||||
************************************************************************************/
|
||||
|
||||
/* Clocking *************************************************************************/
|
||||
/* #define AVR32_FRCOSC 15200 RCOsc frequency in Hz */
|
||||
|
||||
#define AVR32_FOSC32 32768 /* Osc32 frequency in Hz */
|
||||
#define AVR32_OSC32STARTUP 3 /* Osc32 startup time in RCOsc periods */
|
||||
|
||||
#define AVR32_FOSC0 12000000 /* Osc0 frequency in Hz */
|
||||
#define AVR32_OSC0STARTUP 3 /* Osc0 startup time in RCOsc periods.
|
||||
|
||||
/* #define AVR32_FOSC1 12000000 Osc1 frequency: Hz.
|
||||
* #define AVR32_OSC1STARTUP 3 Osc1 startup time in RCOsc periods.
|
||||
*/
|
||||
|
||||
#define AVR32_CPU_CLOCK AVR32_FOSC0
|
||||
#define AVR32_PBA_CLOCK AVR32_FOSC0
|
||||
|
||||
/* LED definitions ******************************************************************/
|
||||
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user