diff options
Diffstat (limited to 'at91lib/peripherals/dbgu/dbgu.c')
| -rw-r--r-- | at91lib/peripherals/dbgu/dbgu.c | 174 |
1 files changed, 174 insertions, 0 deletions
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 <stdarg.h>
+#include <board.h>
+
+//------------------------------------------------------------------------------
+// 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 <stdio.h>
+
+//------------------------------------------------------------------------------
+/// \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
+
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