From 98f9d442b44dbe2e3e4b3c8296be7e78d5d05450 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sun, 24 Jul 2011 09:39:28 +0200 Subject: initial import of the usb ccid example for the sam7s --- at91lib/peripherals/dbgu/dbgu.c | 174 ++++++++++++++++++++++++++++++++++++++++ at91lib/peripherals/dbgu/dbgu.h | 79 ++++++++++++++++++ 2 files changed, 253 insertions(+) create mode 100644 at91lib/peripherals/dbgu/dbgu.c create mode 100644 at91lib/peripherals/dbgu/dbgu.h (limited to 'at91lib/peripherals/dbgu') diff --git a/at91lib/peripherals/dbgu/dbgu.c b/at91lib/peripherals/dbgu/dbgu.c new file mode 100644 index 0000000..2034730 --- /dev/null +++ b/at91lib/peripherals/dbgu/dbgu.c @@ -0,0 +1,174 @@ +/* ---------------------------------------------------------------------------- + * ATMEL Microcontroller Software Support + * ---------------------------------------------------------------------------- + * Copyright (c) 2008, Atmel Corporation + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the disclaimer below. + * + * Atmel's name may not be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE + * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, + * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * ---------------------------------------------------------------------------- + */ + +//------------------------------------------------------------------------------ +// Headers +//------------------------------------------------------------------------------ + +#include "dbgu.h" +#include +#include + +//------------------------------------------------------------------------------ +// Global functions +//------------------------------------------------------------------------------ +//------------------------------------------------------------------------------ +/// Initializes the DBGU with the given parameters, and enables both the +/// transmitter and the receiver. The mode parameter contains the value of the +/// DBGU_MR register. +/// Value DBGU_STANDARD can be used for mode to get the most common configuration +/// (i.e. aysnchronous, 8bits, no parity, 1 stop bit, no flow control). +/// \param mode Operating mode to configure. +/// \param baudrate Desired baudrate (e.g. 115200). +/// \param mck Frequency of the system master clock in Hz. +//------------------------------------------------------------------------------ +void DBGU_Configure( + unsigned int mode, + unsigned int baudrate, + unsigned int mck) +{ + // Reset & disable receiver and transmitter, disable interrupts + AT91C_BASE_DBGU->DBGU_CR = AT91C_US_RSTRX | AT91C_US_RSTTX; + AT91C_BASE_DBGU->DBGU_IDR = 0xFFFFFFFF; + + // Configure baud rate + AT91C_BASE_DBGU->DBGU_BRGR = mck / (baudrate * 16); + + // Configure mode register + AT91C_BASE_DBGU->DBGU_MR = mode; + + // Disable DMA channel + AT91C_BASE_DBGU->DBGU_PTCR = AT91C_PDC_RXTDIS | AT91C_PDC_TXTDIS; + + // Enable receiver and transmitter + AT91C_BASE_DBGU->DBGU_CR = AT91C_US_RXEN | AT91C_US_TXEN; +} + +//------------------------------------------------------------------------------ +/// Outputs a character on the DBGU line. +/// \note This function is synchronous (i.e. uses polling). +/// \param c Character to send. +//------------------------------------------------------------------------------ +void DBGU_PutChar(unsigned char c) +{ + // Wait for the transmitter to be ready + while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXEMPTY) == 0); + + // Send character + AT91C_BASE_DBGU->DBGU_THR = c; + + // Wait for the transfer to complete + while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXEMPTY) == 0); +} + +//------------------------------------------------------------------------------ +/// Return 1 if a character can be read in DBGU +//------------------------------------------------------------------------------ +unsigned int DBGU_IsRxReady() +{ + return (AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_RXRDY); +} + +//------------------------------------------------------------------------------ +/// Reads and returns a character from the DBGU. +/// \note This function is synchronous (i.e. uses polling). +/// \return Character received. +//------------------------------------------------------------------------------ +unsigned char DBGU_GetChar(void) +{ + while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_RXRDY) == 0); + return AT91C_BASE_DBGU->DBGU_RHR; +} + +#ifndef NOFPUT +#include + +//------------------------------------------------------------------------------ +/// \exclude +/// Implementation of fputc using the DBGU as the standard output. Required +/// for printf(). +/// \param c Character to write. +/// \param pStream Output stream. +/// \param The character written if successful, or -1 if the output stream is +/// not stdout or stderr. +//------------------------------------------------------------------------------ +signed int fputc(signed int c, FILE *pStream) +{ + if ((pStream == stdout) || (pStream == stderr)) { + + DBGU_PutChar(c); + return c; + } + else { + + return EOF; + } +} + +//------------------------------------------------------------------------------ +/// \exclude +/// Implementation of fputs using the DBGU as the standard output. Required +/// for printf(). Does NOT currently use the PDC. +/// \param pStr String to write. +/// \param pStream Output stream. +/// \return Number of characters written if successful, or -1 if the output +/// stream is not stdout or stderr. +//------------------------------------------------------------------------------ +signed int fputs(const char *pStr, FILE *pStream) +{ + signed int num = 0; + + while (*pStr != 0) { + + if (fputc(*pStr, pStream) == -1) { + + return -1; + } + num++; + pStr++; + } + + return num; +} + +#undef putchar + +//------------------------------------------------------------------------------ +/// \exclude +/// Outputs a character on the DBGU. +/// \param c Character to output. +/// \return The character that was output. +//------------------------------------------------------------------------------ +signed int putchar(signed int c) +{ + return fputc(c, stdout); +} + +#endif //#ifndef NOFPUT + diff --git a/at91lib/peripherals/dbgu/dbgu.h b/at91lib/peripherals/dbgu/dbgu.h new file mode 100644 index 0000000..816f11d --- /dev/null +++ b/at91lib/peripherals/dbgu/dbgu.h @@ -0,0 +1,79 @@ +/* ---------------------------------------------------------------------------- + * ATMEL Microcontroller Software Support + * ---------------------------------------------------------------------------- + * Copyright (c) 2008, Atmel Corporation + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the disclaimer below. + * + * Atmel's name may not be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE + * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, + * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * ---------------------------------------------------------------------------- + */ + +//------------------------------------------------------------------------------ +/// \unit +/// +/// !Purpose +/// +/// This module provides definitions and functions for using the Debug Unit +/// (DBGU). +/// +/// It also overloads the fputc(), fputs() & putchar() functions so the printf() +/// method outputs its data on the DBGU. This behavior can be suppressed by +/// defining NOFPUT during compilation. +/// +/// !Usage +/// +/// -# Enable the DBGU pins (see pio & board.h). +/// -# Configure the DBGU using DBGU_Configure with the desired operating mode. +/// -# Send characters using DBGU_PutChar() or the printf() method. +/// -# Receive characters using DBGU_GetChar(). +/// +/// \note Unless specified, all the functions defined here operate synchronously; +/// i.e. they all wait the data is sent/received before returning. +//------------------------------------------------------------------------------ + +#ifndef DBGU_H +#define DBGU_H + +//------------------------------------------------------------------------------ +// Definitions +//------------------------------------------------------------------------------ + +/// Standard operating mode (asynchronous, 8bit, no parity, 1 stop bit) +#define DBGU_STANDARD AT91C_US_PAR_NONE + +//------------------------------------------------------------------------------ +// Global functions +//------------------------------------------------------------------------------ + +extern void DBGU_Configure( + unsigned int mode, + unsigned int baudrate, + unsigned int mck); + +extern unsigned char DBGU_GetChar(void); + +extern void DBGU_PutChar(unsigned char c); + +extern unsigned int DBGU_IsRxReady(void); + +#endif //#ifndef DBGU_H + -- cgit v1.2.3