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Diffstat (limited to 'examples/lpc43xx/hackrf-jellybean/systick/systickdemo.c')
-rw-r--r--examples/lpc43xx/hackrf-jellybean/systick/systickdemo.c184
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diff --git a/examples/lpc43xx/hackrf-jellybean/systick/systickdemo.c b/examples/lpc43xx/hackrf-jellybean/systick/systickdemo.c
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+++ b/examples/lpc43xx/hackrf-jellybean/systick/systickdemo.c
@@ -0,0 +1,184 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/lpc43xx/gpio.h>
+#include <libopencm3/lpc43xx/scu.h>
+#include <libopencm3/lpc43xx/cgu.h>
+#include <libopencm3/lpc43xx/nvic.h>
+#include <libopencm3/lpc43xx/systick.h>
+#include <libopencm3/cm3/scs.h>
+
+#include "../jellybean_conf.h"
+
+/* Global counter incremented by SysTick Interrupt each millisecond */
+volatile u32 g_ulSysTickCount;
+u32 g_NbCyclePerSecond;
+
+void gpio_setup(void)
+{
+ /* Configure all GPIO as Input (safe state) */
+ GPIO0_DIR = 0;
+ GPIO1_DIR = 0;
+ GPIO2_DIR = 0;
+ GPIO3_DIR = 0;
+ GPIO4_DIR = 0;
+ GPIO5_DIR = 0;
+ GPIO6_DIR = 0;
+ GPIO7_DIR = 0;
+
+ /* Configure SCU Pin Mux as GPIO */
+ scu_pinmux(SCU_PINMUX_LED1, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_LED2, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_LED3, SCU_GPIO_FAST);
+
+ scu_pinmux(SCU_PINMUX_EN1V8, SCU_GPIO_FAST);
+
+ scu_pinmux(SCU_PINMUX_BOOT0, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT1, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT2, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT3, SCU_GPIO_FAST);
+
+ /* Configure SSP1 Peripheral (to be moved later in SSP driver) */
+ scu_pinmux(SCU_SSP1_MISO, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
+ scu_pinmux(SCU_SSP1_MOSI, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
+ scu_pinmux(SCU_SSP1_SCK, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
+ scu_pinmux(SCU_SSP1_SSEL, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
+
+ /* Configure GPIO as Output */
+ GPIO2_DIR |= (PIN_LED1|PIN_LED2|PIN_LED3); /* Configure GPIO2[1/2/8] (P4_1/2 P6_12) as output. */
+ GPIO3_DIR |= PIN_EN1V8; /* GPIO3[6] on P6_10 as output. */
+}
+
+void systick_setup(void)
+{
+ u32 systick_reload_val;
+ g_ulSysTickCount = 0;
+
+ /* Disable IRQ globally */
+ asm volatile ("cpsid i");
+
+ /* Set processor Clock as Source Clock */
+ systick_set_clocksource(STK_CTRL_CLKSOURCE);
+
+ /* Get SysTick calibration value to obtain by default 1 tick = 10ms */
+ systick_reload_val = systick_get_calib();
+ /*
+ * Calibration seems wrong on LPC43xx(TBC) for default Freq it assume System Clock is 12MHz but it is 12*8=96MHz
+ * Fix the Calibration value bu multiplication by 8
+ */
+ systick_reload_val = (systick_reload_val*8);
+
+ /* To obtain 1ms per tick just divide by 10 the 10ms base tick and set the reload */
+ systick_reload_val = systick_reload_val/10;
+ systick_set_reload(systick_reload_val);
+
+ systick_interrupt_enable();
+
+ /* Start counting. */
+ systick_counter_enable();
+
+ /* Set SysTick Priority to maximum */
+ nvic_set_priority(NVIC_SYSTICK_IRQ, 0xFF);
+
+ /* Enable IRQ globally */
+ asm volatile ("cpsie i");
+}
+
+void scs_dwt_cycle_counter_enabled(void)
+{
+ SCS_DEMCR |= SCS_DEMCR_TRCENA;
+ SCS_DWT_CTRL |= SCS_DWT_CTRL_CYCCNTENA;
+}
+
+u32 sys_tick_get_time_ms(void)
+{
+ return g_ulSysTickCount;
+}
+
+u32 sys_tick_delta_time_ms(u32 start, u32 end)
+{
+ #define MAX_T_U32 ((2^32)-1)
+ u32 diff;
+
+ if(end > start)
+ {
+ diff=end-start;
+ }else
+ {
+ diff=MAX_T_U32-(start-end)+1;
+ }
+
+ return diff;
+}
+
+void sys_tick_wait_time_ms(u32 wait_ms)
+{
+ u32 start, end;
+ u32 tickms;
+
+ start = sys_tick_get_time_ms();
+
+ do
+ {
+ end = sys_tick_get_time_ms();
+ tickms = sys_tick_delta_time_ms(start, end);
+ }while(tickms < wait_ms);
+}
+
+/* Called each 1ms/1000Hz by interrupt
+ 1) Count the number of cycle per second.
+ 2) Increment g_ulSysTickCount counter.
+*/
+void sys_tick_handler(void)
+{
+ if(g_ulSysTickCount==0)
+ {
+ /* Clear Cycle Counter*/
+ SCS_DWT_CYCCNT = 0;
+ }else if(g_ulSysTickCount==1000)
+ {
+ /* Capture number of cycle elapsed during 1 second */
+ g_NbCyclePerSecond = SCS_DWT_CYCCNT;
+ }
+
+ g_ulSysTickCount++;
+}
+
+int main(void)
+{
+ systick_setup();
+
+ gpio_setup();
+
+ /* SCS & Cycle Counter enabled (used to count number of cycles executed per second see g_NbCyclePerSecond */
+ scs_dwt_cycle_counter_enabled();
+
+ while (1)
+ {
+ gpio_set(PORT_LED1_3, (PIN_LED1|PIN_LED2|PIN_LED3)); /* LEDs on */
+
+ sys_tick_wait_time_ms(500);
+
+ gpio_clear(PORT_LED1_3, (PIN_LED1|PIN_LED2|PIN_LED3)); /* LED off */
+
+ sys_tick_wait_time_ms(500);
+ }
+
+ return 0;
+}