00001 /* 00002 * Copyright (C) 2005 by egnite Software GmbH. All rights reserved. 00003 * 00004 * Redistribution and use in source and binary forms, with or without 00005 * modification, are permitted provided that the following conditions 00006 * are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the copyright holders nor the names of 00014 * contributors may be used to endorse or promote products derived 00015 * from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS 00018 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00019 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00020 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE 00021 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00022 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00023 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 00024 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 00025 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00026 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00027 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00028 * SUCH DAMAGE. 00029 * 00030 * For additional information see http://www.ethernut.de/ 00031 */ 00032 00033 /* 00034 * $Log: usart0at91.c,v $ 00035 * Revision 1.4 2007/10/04 20:04:11 olereinhardt 00036 * Support for SAM7S256 added 00037 * 00038 * Revision 1.3 2006/07/05 07:55:23 haraldkipp 00039 * Daidai's support for AT91SAM7X added. 00040 * 00041 * Revision 1.2 2006/01/05 16:46:52 haraldkipp 00042 * Baudrate calculation is now based on NutGetCpuClock(). 00043 * 00044 * Revision 1.1 2005/11/20 14:40:28 haraldkipp 00045 * Added interrupt driven UART driver for AT91. 00046 * 00047 */ 00048 00049 #include <cfg/os.h> 00050 #include <cfg/clock.h> 00051 #include <cfg/arch.h> 00052 00053 #include <string.h> 00054 00055 #include <sys/atom.h> 00056 #include <sys/event.h> 00057 #include <sys/timer.h> 00058 00059 #include <dev/irqreg.h> 00060 #include <dev/usartat91.h> 00061 00062 #ifndef NUT_CPU_FREQ 00063 #ifdef NUT_PLL_CPUCLK 00064 #include <dev/cy2239x.h> 00065 #else /* !NUT_PLL_CPUCLK */ 00066 #define NUT_CPU_FREQ 73728000UL 00067 #endif /* !NUT_PLL_CPUCLK */ 00068 #endif /* !NUT_CPU_FREQ */ 00069 00070 /* 00071 * Local function prototypes. 00072 */ 00073 static u_long At91UsartGetSpeed(void); 00074 static int At91UsartSetSpeed(u_long rate); 00075 static u_char At91UsartGetDataBits(void); 00076 static int At91UsartSetDataBits(u_char bits); 00077 static u_char At91UsartGetParity(void); 00078 static int At91UsartSetParity(u_char mode); 00079 static u_char At91UsartGetStopBits(void); 00080 static int At91UsartSetStopBits(u_char bits); 00081 static u_long At91UsartGetFlowControl(void); 00082 static int At91UsartSetFlowControl(u_long flags); 00083 static u_long At91UsartGetStatus(void); 00084 static int At91UsartSetStatus(u_long flags); 00085 static u_char At91UsartGetClockMode(void); 00086 static int At91UsartSetClockMode(u_char mode); 00087 static void At91UsartTxStart(void); 00088 static void At91UsartRxStart(void); 00089 static int At91UsartInit(void); 00090 static int At91UsartDeinit(void); 00091 00096 00100 static USARTDCB dcb_usart0 = { 00101 0, /* dcb_modeflags */ 00102 0, /* dcb_statusflags */ 00103 0, /* dcb_rtimeout */ 00104 0, /* dcb_wtimeout */ 00105 {0, 0, 0, 0, 0, 0, 0, 0}, /* dcb_tx_rbf */ 00106 {0, 0, 0, 0, 0, 0, 0, 0}, /* dcb_rx_rbf */ 00107 0, /* dbc_last_eol */ 00108 At91UsartInit, /* dcb_init */ 00109 At91UsartDeinit, /* dcb_deinit */ 00110 At91UsartTxStart, /* dcb_tx_start */ 00111 At91UsartRxStart, /* dcb_rx_start */ 00112 At91UsartSetFlowControl, /* dcb_set_flow_control */ 00113 At91UsartGetFlowControl, /* dcb_get_flow_control */ 00114 At91UsartSetSpeed, /* dcb_set_speed */ 00115 At91UsartGetSpeed, /* dcb_get_speed */ 00116 At91UsartSetDataBits, /* dcb_set_data_bits */ 00117 At91UsartGetDataBits, /* dcb_get_data_bits */ 00118 At91UsartSetParity, /* dcb_set_parity */ 00119 At91UsartGetParity, /* dcb_get_parity */ 00120 At91UsartSetStopBits, /* dcb_set_stop_bits */ 00121 At91UsartGetStopBits, /* dcb_get_stop_bits */ 00122 At91UsartSetStatus, /* dcb_set_status */ 00123 At91UsartGetStatus, /* dcb_get_status */ 00124 At91UsartSetClockMode, /* dcb_set_clock_mode */ 00125 At91UsartGetClockMode, /* dcb_get_clock_mode */ 00126 }; 00127 00143 NUTDEVICE devUsartAt910 = { 00144 0, /* Pointer to next device, dev_next. */ 00145 {'u', 'a', 'r', 't', '0', 0, 0, 0, 0}, /* Unique device name, dev_name. */ 00146 IFTYP_CHAR, /* Type of device, dev_type. */ 00147 0, /* Base address, dev_base (not used). */ 00148 0, /* First interrupt number, dev_irq (not used). */ 00149 0, /* Interface control block, dev_icb (not used). */ 00150 &dcb_usart0, /* Driver control block, dev_dcb. */ 00151 UsartInit, /* Driver initialization routine, dev_init. */ 00152 UsartIOCtl, /* Driver specific control function, dev_ioctl. */ 00153 UsartRead, /* Read from device, dev_read. */ 00154 UsartWrite, /* Write to device, dev_write. */ 00155 UsartOpen, /* Open a device or file, dev_open. */ 00156 UsartClose, /* Close a device or file, dev_close. */ 00157 UsartSize /* Request file size, dev_size. */ 00158 }; 00159 00163 00164 #define USARTn_BASE USART0_BASE 00165 #define US_ID US0_ID 00166 #if defined (MCU_AT91SAM7X256) 00167 #define US_GPIO_PINS 0x00000003 00168 #elif defined (MCU_AT91SAM7S256) 00169 #define US_GPIO_PINS 0x00000060 00170 #else 00171 #define US_GPIO_PINS 0x0000C000 00172 #endif 00173 #define SIG_UART sig_UART0 00174 #define dcb_usart dcb_usart0 00175 00176 #include "usartat91.c"