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cc2538: sys_ctrl: Make it possible to use the 32-kHz crystal
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
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@ -35,20 +35,39 @@
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* \file
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* Implementation of the cc2538 System Control driver
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*/
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#include "contiki.h"
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#include "reg.h"
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#include "cpu.h"
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#include "dev/sys-ctrl.h"
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#include "dev/gpio.h"
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#include "dev/ioc.h"
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#include <stdint.h>
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#if SYS_CTRL_OSC32K_USE_XTAL
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#define SYS_CTRL_OSCS 0
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#else
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#define SYS_CTRL_OSCS SYS_CTRL_CLOCK_CTRL_OSC32K
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#endif
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/*---------------------------------------------------------------------------*/
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void
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sys_ctrl_init()
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{
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uint32_t val;
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#if SYS_CTRL_OSC32K_USE_XTAL
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/* Set the XOSC32K_Q pads to analog for crystal */
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GPIO_SOFTWARE_CONTROL(GPIO_PORT_TO_BASE(GPIO_D_NUM), GPIO_PIN_MASK(6));
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GPIO_SET_INPUT(GPIO_PORT_TO_BASE(GPIO_D_NUM), GPIO_PIN_MASK(6));
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ioc_set_over(GPIO_D_NUM, 6, IOC_OVERRIDE_ANA);
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GPIO_SOFTWARE_CONTROL(GPIO_PORT_TO_BASE(GPIO_D_NUM), GPIO_PIN_MASK(7));
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GPIO_SET_INPUT(GPIO_PORT_TO_BASE(GPIO_D_NUM), GPIO_PIN_MASK(7));
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ioc_set_over(GPIO_D_NUM, 7, IOC_OVERRIDE_ANA);
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#endif
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/*
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* Desired Clock Ctrl configuration:
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* 32KHz source: RC
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* 32KHz source: RC or crystal, according to SYS_CTRL_OSC32K_USE_XTAL
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* System Clock: 32 MHz
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* Power Down Unused
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* I/O Div: 16MHz
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@ -56,11 +75,18 @@ sys_ctrl_init()
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* Rest: Don't care
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*/
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val = SYS_CTRL_CLOCK_CTRL_OSC32K | SYS_CTRL_CLOCK_CTRL_OSC_PD
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val = SYS_CTRL_OSCS | SYS_CTRL_CLOCK_CTRL_OSC_PD
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| SYS_CTRL_CLOCK_CTRL_IO_DIV_16MHZ | SYS_CTRL_CLOCK_CTRL_SYS_DIV_16MHZ;
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REG(SYS_CTRL_CLOCK_CTRL) = val;
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while((REG(SYS_CTRL_CLOCK_STA) & SYS_CTRL_CLOCK_STA_OSC) != 0);
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while((REG(SYS_CTRL_CLOCK_STA) & (SYS_CTRL_CLOCK_STA_OSC32K |
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SYS_CTRL_CLOCK_STA_OSC)) != SYS_CTRL_OSCS);
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#if SYS_CTRL_OSC32K_USE_XTAL
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/* Wait for the 32-kHz crystal oscillator to stabilize */
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while(REG(SYS_CTRL_CLOCK_STA) & SYS_CTRL_CLOCK_STA_SYNC_32K);
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while(!(REG(SYS_CTRL_CLOCK_STA) & SYS_CTRL_CLOCK_STA_SYNC_32K));
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#endif
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}
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/*---------------------------------------------------------------------------*/
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void
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@ -228,11 +228,26 @@
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#define SYS_CTRL_PMCTL_PM0 0x00000000 /**< PM0 */
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/** @} */
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/*---------------------------------------------------------------------------*/
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/** \name SysCtrl 32-kHz oscillator selection
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*
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* Prefer the crystal oscillator for time accuracy, and the RC oscillator for
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* cost and power consumption
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* @{
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*/
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/* Defaults to RC oscillator unless the configuration tells us otherwise */
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#ifdef SYS_CTRL_CONF_OSC32K_USE_XTAL
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#define SYS_CTRL_OSC32K_USE_XTAL SYS_CTRL_CONF_OSC32K_USE_XTAL
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#else
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#define SYS_CTRL_OSC32K_USE_XTAL 0
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#endif
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/** @} */
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/*---------------------------------------------------------------------------*/
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/** \name SysCtrl functions
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* @{
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*/
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/** \brief Initialises the System Control Driver. The main purpose of this
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* function is to power up and select clocks and oscillators */
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* function is to power up and select clocks and oscillators
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* \note This function depends on ioc_init() having been called beforehand. */
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void sys_ctrl_init();
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/** \brief Generates a warm reset through the SYS_CTRL_PWRDBG register */
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@ -127,12 +127,12 @@ int
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main(void)
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{
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nvic_init();
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ioc_init();
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sys_ctrl_init();
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clock_init();
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lpm_init();
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rtimer_init();
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gpio_init();
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ioc_init();
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leds_init();
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fade(LEDS_YELLOW);
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