*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
#include <ao.h>
-volatile __data AO_TICK_TYPE ao_tick_count;
+volatile AO_TICK_TYPE ao_tick_count;
-uint16_t
+AO_TICK_TYPE
ao_time(void)
{
return ao_tick_count;
}
#if AO_DATA_ALL
-volatile __data uint8_t ao_data_interval = 1;
-volatile __data uint8_t ao_data_count;
+volatile uint8_t ao_data_interval = 1;
+volatile uint8_t ao_data_count;
#endif
void lpc_systick_isr(void)
}
#endif
-#define SYSTICK_RELOAD ((AO_LPC_CLKOUT / 2) / 100 - 1)
+#define SYSTICK_RELOAD ((AO_LPC_SYSCLK / 2) / 100 - 1)
/* Initialize our 100Hz clock */
void
#define AO_LPC_FCCO_MIN 156000000
+static void
+ao_clock_delay(void)
+{
+ uint32_t i;
+ for (i = 0; i < 200; i++)
+ ao_arch_nop();
+}
+
void
ao_clock_init(void)
{
(1 << LPC_SCB_SYSAHBCLKCTRL_FLASHARRAY) |
(1 << LPC_SCB_SYSAHBCLKCTRL_GPIO) |
(1 << LPC_SCB_SYSAHBCLKCTRL_IOCON));
-
+
+ /* Enable the brown-out detection at the highest voltage to
+ * make sure the flash part remains happy
+ */
+
+ lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_BOD_PD);
+ lpc_scb.bodctrl = ((LPC_SCB_BOD_BODRSTLEV_2_63 << LPC_SCB_BOD_BODRSTLEV) |
+ (LPC_SCB_BOD_BODINTVAL_RESERVED << LPC_SCB_BOD_BODINTVAL) |
+ (1 << LPC_SCB_BOD_BODRSTENA));
+
/* Turn the IRC clock back on */
lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_IRC_PD);
-
+ ao_clock_delay();
+
/* Switch to the IRC clock */
lpc_scb.mainclksel = LPC_SCB_MAINCLKSEL_SEL_IRC << LPC_SCB_MAINCLKSEL_SEL;
lpc_scb.mainclkuen = (0 << LPC_SCB_MAINCLKUEN_ENA);
lpc_scb.mainclkuen = (1 << LPC_SCB_MAINCLKUEN_ENA);
-
+ while (!(lpc_scb.mainclkuen & (1 << LPC_SCB_MAINCLKUEN_ENA)))
+ ;
+
+ /* Switch USB to the main clock */
+ lpc_scb.usbclksel = (LPC_SCB_USBCLKSEL_SEL_MAIN_CLOCK << LPC_SCB_USBCLKSEL_SEL);
+ lpc_scb.usbclkuen = (0 << LPC_SCB_USBCLKUEN_ENA);
+ lpc_scb.usbclkuen = (1 << LPC_SCB_USBCLKUEN_ENA);
+ while (!(lpc_scb.usbclkuen & (1 << LPC_SCB_USBCLKUEN_ENA)))
+ ;
+
/* Find a PLL post divider ratio that gets the FCCO in range */
for (p = 0; p < 4; p++)
if (AO_LPC_CLKOUT << (1 + p) >= AO_LPC_FCCO_MIN)
/* Power down the PLL before touching the registers */
lpc_scb.pdruncfg |= (1 << LPC_SCB_PDRUNCFG_SYSPLL_PD);
+ ao_clock_delay();
/* Set PLL divider values */
lpc_scb.syspllctrl = ((AO_LPC_M << LPC_SCB_SYSPLLCTRL_MSEL) |
(p << LPC_SCB_SYSPLLCTRL_PSEL));
-
/* Turn off the external crystal clock */
lpc_scb.pdruncfg |= (1 << LPC_SCB_PDRUNCFG_SYSOSC_PD);
+ ao_clock_delay();
/* Configure the crystal clock */
lpc_scb.sysoscctrl = ((0 << LPC_SCB_SYSOSCCTRL_BYPASS) | /* using a crystal */
/* Turn on the external crystal clock */
lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_SYSOSC_PD);
+ ao_clock_delay();
/* Select crystal as PLL input */
lpc_scb.syspllclksel = (LPC_SCB_SYSPLLCLKSEL_SEL_SYSOSC << LPC_SCB_SYSPLLCLKSEL_SEL);
- lpc_scb.syspllclkuen = 0;
lpc_scb.syspllclkuen = (1 << LPC_SCB_SYSPLLCLKUEN_ENA);
-
+ lpc_scb.syspllclkuen = (0 << LPC_SCB_SYSPLLCLKUEN_ENA);
+ lpc_scb.syspllclkuen = (1 << LPC_SCB_SYSPLLCLKUEN_ENA);
+ while (!(lpc_scb.syspllclkuen & (1 << LPC_SCB_SYSPLLCLKUEN_ENA)))
+ ;
+
/* Turn on the PLL */
lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_SYSPLL_PD);
/* Wait for it to lock */
-
+
for (i = 0; i < 20000; i++)
if (lpc_scb.syspllstat & (1 << LPC_SCB_SYSPLLSTAT_LOCK))
break;
/* Switch to the PLL */
lpc_scb.mainclksel = LPC_SCB_MAINCLKSEL_SEL_PLL_OUTPUT << LPC_SCB_MAINCLKSEL_SEL;
- lpc_scb.mainclkuen = 0 << LPC_SCB_MAINCLKUEN_ENA;
- lpc_scb.mainclkuen = 1 << LPC_SCB_MAINCLKUEN_ENA;
+ lpc_scb.mainclkuen = (1 << LPC_SCB_MAINCLKUEN_ENA);
+ lpc_scb.mainclkuen = (0 << LPC_SCB_MAINCLKUEN_ENA);
+ lpc_scb.mainclkuen = (1 << LPC_SCB_MAINCLKUEN_ENA);
+ while (!(lpc_scb.mainclkuen & (1 << LPC_SCB_MAINCLKUEN_ENA)))
+ ;
/* Set system clock divider */
lpc_scb.sysahbclkdiv = AO_LPC_CLKOUT / AO_LPC_SYSCLK;
- /* Set USB clock source */
- lpc_scb.usbclksel = (LPC_SCB_USBCLKSEL_SEL_MAIN_CLOCK << LPC_SCB_USBCLKSEL_SEL);
- lpc_scb.usbclkuen = (0 << LPC_SCB_USBCLKUEN_ENA);
- lpc_scb.usbclkuen = (1 << LPC_SCB_USBCLKUEN_ENA);
-
/* Shut down perhipheral clocks (enabled as needed) */
lpc_scb.ssp0clkdiv = 0;
lpc_scb.uartclkdiv = 0;
lpc_scb.ssp1clkdiv = 0;
lpc_scb.usbclkdiv = 0;
lpc_scb.clkoutdiv = 0;
+
+ /* Switch USB PLL source to system osc so we can power down the IRC */
+ lpc_scb.usbpllclksel = (LPC_SCB_USBPLLCLKSEL_SEL_SYSOSC << LPC_SCB_USBPLLCLKSEL_SEL);
+ lpc_scb.usbpllclkuen = (0 << LPC_SCB_USBPLLCLKUEN_ENA);
+ lpc_scb.usbpllclkuen = (1 << LPC_SCB_USBPLLCLKUEN_ENA);
+ while (!(lpc_scb.usbpllclkuen & (1 << LPC_SCB_USBPLLCLKUEN_ENA)))
+ ;
+
+ /* Power down everything we don't need */
+ lpc_scb.pdruncfg = ((1 << LPC_SCB_PDRUNCFG_IRCOUT_PD) |
+ (1 << LPC_SCB_PDRUNCFG_IRC_PD) |
+ (0 << LPC_SCB_PDRUNCFG_BOD_PD) |
+ (1 << LPC_SCB_PDRUNCFG_ADC_PD) |
+ (1 << LPC_SCB_PDRUNCFG_WDTOSC_PD) |
+ (1 << LPC_SCB_PDRUNCFG_USBPLL_PD) |
+ (1 << LPC_SCB_PDRUNCFG_USBPAD_PD) |
+ (1 << 11) |
+ (7 << 13));
}
projects / fw / altos / blobdiff