Contiki 2.6

default_lowlevel.c

00001 /*
00002  * Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
00003  * to the MC1322x project (http://mc1322x.devl.org)
00004  * All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  * 3. Neither the name of the Institute nor the names of its contributors
00015  *    may be used to endorse or promote products derived from this software
00016  *    without specific prior written permission.
00017  *
00018  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00019  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00020  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00021  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00022  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00023  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00024  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00025  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00026  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00027  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * This file is part of libmc1322x: see http://mc1322x.devl.org
00031  * for details. 
00032  *
00033  *
00034  */
00035 
00036 #include <mc1322x.h>
00037 #include <stdint.h>
00038 
00039 void default_vreg_init(void) {
00040         volatile uint32_t i;
00041         *CRM_SYS_CNTL = 0x00000018; /* set default state */
00042         *CRM_VREG_CNTL = 0x00000f04; /* bypass the buck */
00043         for(i=0; i<0x161a8; i++) { continue; } /* wait for the bypass to take */
00044 //      while((((*(volatile uint32_t *)(0x80003018))>>17) & 1) !=1) { continue; } /* wait for the bypass to take */
00045         *CRM_VREG_CNTL = 0x00000ff8; /* start the regulators */
00046 }
00047 
00048 void uart1_init(volatile uint16_t inc, volatile uint16_t mod, volatile uint8_t samp) {
00049 
00050         /* UART must be disabled to set the baudrate */
00051         UART1->CON = 0;
00052         
00053         UART1->BR = ( inc << 16 ) | mod;
00054 
00055         /* TX and CTS as outputs */
00056         GPIO->PAD_DIR_SET.GPIO_14 = 1;
00057         GPIO->PAD_DIR_SET.GPIO_16 = 1;
00058                 
00059         /* RX and RTS as inputs */
00060         GPIO->PAD_DIR_RESET.GPIO_15 = 1;
00061         GPIO->PAD_DIR_RESET.GPIO_17 = 1;
00062 
00063         /* see Section 11.5.1.2 Alternate Modes */
00064         /* you must enable the peripheral first BEFORE setting the function in GPIO_FUNC_SEL */
00065         /* From the datasheet: "The peripheral function will control operation of the pad IF */
00066         /* THE PERIPHERAL IS ENABLED. */
00067 
00068 #if UART1_RX_BUFFERSIZE > 32
00069         *UART1_UCON = (1 << 0) | (1 << 1) ;     /* enable receive, transmit, and both interrupts */
00070         *UART1_URXCON = 30;                                     /* interrupt when fifo is nearly full */
00071         u1_rx_head = 0; u1_rx_tail = 0;
00072 #elif UART1_RX_BUFFERSIZE < 32                  /* enable receive, transmit, flow control, disable rx interrupt */
00073         *UART1_UCON = (1 << 0) | (1 << 1) | (1 << 12) | (1 << 14); 
00074         *UART1_UCTS = UART1_RX_BUFFERSIZE;  /* drop cts when tx buffer at trigger level */
00075         *GPIO_FUNC_SEL1 = ( (0x01 << (0*2)) | (0x01 << (1*2)) ); /* set GPIO17-16 to UART1 CTS and RTS */
00076 #else 
00077         *UART1_UCON = (1 << 0) | (1 << 1) | (1 << 14); /* enable receive, transmit, disable rx interrupt */
00078 #endif
00079 
00080         if(samp == UCON_SAMP_16X) 
00081                 set_bit(*UART1_UCON,UCON_SAMP);
00082 
00083         /* set GPIO15-14 to UART (UART1 TX and RX)*/
00084         GPIO->FUNC_SEL.GPIO_14 = 1;
00085         GPIO->FUNC_SEL.GPIO_15 = 1;
00086        
00087         /* interrupt when there are this number or more bytes free in the TX buffer*/
00088         UART1->TXCON = 16;
00089         u1_tx_head = 0; u1_tx_tail = 0;
00090 
00091         /* enable UART1 interrupts in the interrupt controller */
00092         enable_irq(UART1);
00093 }
00094 
00095 void uart2_init(volatile uint16_t inc, volatile uint16_t mod, volatile uint8_t samp) {
00096 
00097         /* UART must be disabled to set the baudrate */
00098         UART2->CON = 0;
00099         
00100         UART2->BR = ( inc << 16 ) | mod;
00101 
00102         /* TX and CTS as outputs */
00103         GPIO->PAD_DIR_SET.GPIO_18 = 1;
00104         GPIO->PAD_DIR_SET.GPIO_20 = 1;
00105                 
00106         /* RX and RTS as inputs */
00107         GPIO->PAD_DIR_RESET.GPIO_19 = 1;
00108         GPIO->PAD_DIR_RESET.GPIO_21 = 1;
00109 
00110         /* see Section 11.5.1.2 Alternate Modes */
00111         /* you must enable the peripheral first BEFORE setting the function in GPIO_FUNC_SEL */
00112         /* From the datasheet: "The peripheral function will control operation of the pad IF */
00113         /* THE PERIPHERAL IS ENABLED. */
00114 
00115 #if UART2_RX_BUFFERSIZE > 32
00116         *UART2_UCON = (1 << 0) | (1 << 1) ;     /* enable receive, transmit, and both interrupts */
00117         *UART2_URXCON = 30;                                     /* interrupt when fifo is nearly full */
00118         u2_rx_head = 0; u2_rx_tail = 0;
00119 #elif UART2_RX_BUFFERSIZE < 32                  /* enable receive, transmit, disable flow control, disable rx interrupt */
00120         *UART2_UCON = (1 << 0) | (1 << 1) | (0 << 12) | (1 << 14);
00121         *UART2_UCTS = UART2_RX_BUFFERSIZE;  /* drop cts when tx buffer at trigger level */
00122         *GPIO_FUNC_SEL1 = ( (0x01 << (0*2)) | (0x01 << (1*2)) ); /* set GPIO17-16 to UART2 CTS and RTS */
00123 #else 
00124         *UART2_UCON = (1 << 0) | (1 << 1) | (1 << 14); /* enable receive, transmit, disable rx interrupt */
00125 #endif
00126 
00127         if(samp == UCON_SAMP_16X) 
00128                 set_bit(*UART2_UCON,UCON_SAMP);
00129 
00130         /* set GPIO15-14 to UART (UART2 TX and RX)*/
00131         GPIO->FUNC_SEL.GPIO_18 = 1;
00132         GPIO->FUNC_SEL.GPIO_19 = 1;
00133 
00134         /* interrupt when there are this number or more bytes free in the TX buffer*/
00135         UART2->TXCON = 16;
00136         u2_tx_head = 0; u2_tx_tail = 0;
00137 
00138         /* enable UART2 interrupts in the interrupt controller */
00139         enable_irq(UART2);
00140 }