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authorHarald Welte <laforge@gnumonks.org>2011-07-04 20:52:54 +0200
committerHarald Welte <laforge@gnumonks.org>2011-07-04 20:52:54 +0200
commit044ad7c3987460ede48ff27afd6bdb0ca05a0432 (patch)
tree924818cdb0d39ca08aec540d18da7bd406eaae8c /peripherals/dbgu
import at91lib from at91lib_20100901_softpack_1_9_v_1_0_svn_v1501120100901_softpack_1_9_v_1_0_svn_v15011
it's sad to see that atmel doesn't publish their svn repo or has a centralized location or even puts proper version/release info into the library itself
Diffstat (limited to 'peripherals/dbgu')
-rw-r--r--peripherals/dbgu/dbgu.c114
-rw-r--r--peripherals/dbgu/dbgu.dir37
-rw-r--r--peripherals/dbgu/dbgu.h79
3 files changed, 230 insertions, 0 deletions
diff --git a/peripherals/dbgu/dbgu.c b/peripherals/dbgu/dbgu.c
new file mode 100644
index 0000000..0b3b380
--- /dev/null
+++ b/peripherals/dbgu/dbgu.c
@@ -0,0 +1,114 @@
+/* ----------------------------------------------------------------------------
+ * 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 <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)
+{
+ #if defined(cortexm3)
+ // Enable clock for UART
+ AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_DBGU);
+ #endif
+
+ // 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;
+}
+
+
+
diff --git a/peripherals/dbgu/dbgu.dir b/peripherals/dbgu/dbgu.dir
new file mode 100644
index 0000000..ec31900
--- /dev/null
+++ b/peripherals/dbgu/dbgu.dir
@@ -0,0 +1,37 @@
+/* ----------------------------------------------------------------------------
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \dir
+///
+/// !!!Purpose
+///
+/// Contains the peripheral API for the Debug Unit (DBGU).
+//------------------------------------------------------------------------------
+
diff --git a/peripherals/dbgu/dbgu.h b/peripherals/dbgu/dbgu.h
new file mode 100644
index 0000000..816f11d
--- /dev/null
+++ b/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
+
personal git repositories of Harald Welte. Your mileage may vary