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/*
* Copyright (C) 2014 INRIA
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup chronos
* @{
*/
/**
* @file
* @brief eZ430-chronos board initialization
*
* @author Oliver Hahm <oliver.hahm@inria.fr>
* @author Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
*
*/
#include <stdint.h>
#include "board.h"
#include "cpu.h"
#include "irq.h"
#include "debug.h"
#include "display.h"
#include "display_putchar.h"
void cc430_cpu_init(void)
{
volatile uint16_t i;
volatile unsigned char *ptr;
/* disable watchdog */
WDTCTL = WDTPW + WDTHOLD;
// ---------------------------------------------------------------------
// Enable 32kHz ACLK
P5SEL |= 0x03; // Select XIN, XOUT on P5.0 and P5.1
UCSCTL6 &= ~XT1OFF; // XT1 On, Highest drive strength
UCSCTL6 |= XCAP_3; // Internal load cap
UCSCTL3 = SELA__XT1CLK; // Select XT1 as FLL reference
UCSCTL4 = SELA__XT1CLK | SELS__DCOCLKDIV | SELM__DCOCLKDIV;
// ---------------------------------------------------------------------
// Configure CPU clock for 12MHz
_BIS_SR(SCG0); // Disable the FLL control loop
UCSCTL0 = 0x0000; // Set lowest possible DCOx, MODx
UCSCTL1 = DCORSEL_5; // Select suitable range
UCSCTL2 = FLLD_1 + 0x16E; // Set DCO Multiplier
_BIC_SR(SCG0); // Enable the FLL control loop
// Worst-case settling time for the DCO when the DCO range bits have been
// changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx
// UG for optimization.
// 32 x 32 x 8 MHz / 32,768 Hz = 250000 = MCLK cycles for DCO to settle
for (i = 0xFF; i > 0; i--); // Time for flag to set
// Loop until XT1 & DCO stabilizes, use do-while to insure that
// body is executed at least once
do {
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG);
SFRIFG1 &= ~OFIFG; // Clear fault flags
}
while ((SFRIFG1 & OFIFG));
// Disable all interrupts
__disable_interrupt();
// Get write-access to port mapping registers:
PMAPPWD = 0x02D52;
// Allow reconfiguration during runtime:
PMAPCTL = PMAPRECFG;
// P2.7 = TA0CCR1A or TA1CCR0A output (buzzer output)
ptr = &P2MAP0;
*(ptr + 7) = PM_TA1CCR0A;
P2OUT &= ~BIT7;
P2DIR |= BIT7;
// P1.5 = SPI MISO input
ptr = &P1MAP0;
*(ptr + 5) = PM_UCA0SOMI;
// P1.6 = SPI MOSI output
*(ptr + 6) = PM_UCA0SIMO;
// P1.7 = SPI CLK output
*(ptr + 7) = PM_UCA0CLK;
// Disable write-access to port mapping registers:
PMAPPWD = 0;
// Re-enable all interrupts
enableIRQ();
}
void board_init(void)
{
cc430_cpu_init();
lcd_init();
init_display_putchar();
DEBUG("DISP OK");
}