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-rw-r--r--src/lpc/ao_fast_timer_lpc.c110
-rw-r--r--src/lpc/ao_timer_lpc.c14
-rw-r--r--src/lpc/lpc.h120
-rw-r--r--src/lpc/registers.ld2
4 files changed, 229 insertions, 17 deletions
diff --git a/src/lpc/ao_fast_timer_lpc.c b/src/lpc/ao_fast_timer_lpc.c
new file mode 100644
index 00000000..c4f26fc4
--- /dev/null
+++ b/src/lpc/ao_fast_timer_lpc.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * 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.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <ao.h>
+#include <ao_fast_timer.h>
+
+static void (*ao_fast_timer_callback[AO_FAST_TIMER_MAX])(void);
+static uint8_t ao_fast_timer_count;
+static uint8_t ao_fast_timer_users;
+
+static void
+ao_fast_timer_enable(void)
+{
+ lpc_ct16b0.tcr = ((1 << LPC_CT16B_TCR_CEN) |
+ (1 << LPC_CT16B_TCR_CRST));
+}
+
+static void
+ao_fast_timer_disable(void)
+{
+ lpc_ct16b0.tcr = ((0 << LPC_CT16B_TCR_CEN) |
+ (0 << LPC_CT16B_TCR_CRST));
+}
+
+void
+ao_fast_timer_on(void (*callback)(void))
+{
+ ao_fast_timer_callback[ao_fast_timer_count] = callback;
+ if (!ao_fast_timer_count++)
+ ao_fast_timer_enable();
+}
+
+void
+ao_fast_timer_off(void (*callback)(void))
+{
+ uint8_t n;
+
+ for (n = 0; n < ao_fast_timer_count; n++)
+ if (ao_fast_timer_callback[n] == callback) {
+ for (; n < ao_fast_timer_count-1; n++) {
+ ao_fast_timer_callback[n] = ao_fast_timer_callback[n+1];
+ }
+ if (!--ao_fast_timer_count)
+ ao_fast_timer_disable();
+ break;
+ }
+}
+
+void lpc_ct16b0_isr(void)
+{
+ uint32_t v = lpc_ct16b0.ir;
+ int i;
+
+ lpc_ct16b0.ir = v;
+ if (v & (1 << LPC_CT16B_IR_MR0INT)) {
+ for (i = 0; i < ao_fast_timer_count; i++)
+ (*ao_fast_timer_callback[i])();
+ }
+}
+
+#ifndef FAST_TIMER_FREQ
+#define FAST_TIMER_FREQ 10000
+#endif
+
+#define TIMER_FAST (AO_LPC_SYSCLK / FAST_TIMER_FREQ)
+
+void
+ao_fast_timer_init(void)
+{
+ if (!ao_fast_timer_users) {
+
+ lpc_nvic_set_enable(LPC_ISR_CT16B0_POS);
+ lpc_nvic_set_priority(LPC_ISR_CT16B0_POS, AO_LPC_NVIC_CLOCK_PRIORITY);
+ /* Turn on 16-bit timer CT16B0 */
+
+ lpc_scb.sysahbclkctrl |= 1 << LPC_SCB_SYSAHBCLKCTRL_CT16B0;
+
+ /* Disable timer */
+ lpc_ct16b0.tcr = 0;
+
+ /* scale factor 1 */
+ lpc_ct16b0.pr = 0;
+ lpc_ct16b0.pc = 0;
+
+ lpc_ct16b0.mcr = ((1 << LPC_CT16B_MCR_MR0I) |
+ (1 << LPC_CT16B_MCR_MR0R));
+
+ lpc_ct16b0.mr[0] = TIMER_FAST;
+
+ ao_fast_timer_disable();
+ }
+ if (ao_fast_timer_users == AO_FAST_TIMER_MAX)
+ ao_panic(AO_PANIC_FAST_TIMER);
+ ao_fast_timer_users++;
+}
+
diff --git a/src/lpc/ao_timer_lpc.c b/src/lpc/ao_timer_lpc.c
index 44fb410e..623559eb 100644
--- a/src/lpc/ao_timer_lpc.c
+++ b/src/lpc/ao_timer_lpc.c
@@ -99,7 +99,7 @@ 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
*/
@@ -112,21 +112,21 @@ ao_clock_init(void)
/* 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)
@@ -163,12 +163,12 @@ ao_clock_init(void)
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;
@@ -199,7 +199,7 @@ ao_clock_init(void)
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) |
diff --git a/src/lpc/lpc.h b/src/lpc/lpc.h
index 9408ceab..40d412d0 100644
--- a/src/lpc/lpc.h
+++ b/src/lpc/lpc.h
@@ -411,7 +411,7 @@ struct lpc_scb {
vuint32_t mainclksel; /* 0x70 */
vuint32_t mainclkuen;
vuint32_t sysahbclkdiv;
- uint32_t r7c;
+ uint32_t r7c;
vuint32_t sysahbclkctrl; /* 0x80 */
uint32_t r84[3];
@@ -429,14 +429,14 @@ struct lpc_scb {
uint32_t rcc;
uint32_t rd0[4];
-
+
vuint32_t clkoutsel; /* 0xe0 */
vuint32_t clkoutuen;
vuint32_t clkoutdiv;
uint32_t rec;
-
+
uint32_t rf0[4]; /* 0xf0 */
-
+
vuint32_t pioporcap0; /* 0x100 */
vuint32_t pioporcap1;
uint32_t r102[2];
@@ -445,7 +445,7 @@ struct lpc_scb {
uint32_t r120[4]; /* 0x120 */
uint32_t r130[4]; /* 0x130 */
uint32_t r140[4]; /* 0x140 */
-
+
vuint32_t bodctrl; /* 0x150 */
vuint32_t systckcal;
uint32_t r158[2];
@@ -479,7 +479,7 @@ struct lpc_scb {
uint32_t r240[12 * 4]; /* 0x240 */
uint32_t r300[15 * 4]; /* 0x300 */
-
+
uint32_t r3f0; /* 0x3f0 */
vuint32_t device_id;
};
@@ -680,7 +680,7 @@ struct lpc_gpio {
vuint32_t word[0x40]; /* 0x1000 */
uint8_t r1100[0x2000 - 0x1100];
-
+
vuint32_t dir[2]; /* 0x2000 */
uint8_t r2008[0x2080 - 0x2008];
@@ -1032,7 +1032,7 @@ lpc_nvic_enabled(int irq) {
return (lpc_nvic.iser >> irq) & 1;
}
-
+
static inline void
lpc_nvic_set_pending(int irq) {
lpc_nvic.ispr = (1 << irq);
@@ -1201,18 +1201,118 @@ extern struct lpc_adc lpc_adc;
#define LPC_ADC_STAT_OVERRUN 8
#define LPC_ADC_STAT_ADINT 16
+struct lpc_ct16b {
+ vuint32_t ir; /* 0x00 */
+ vuint32_t tcr;
+ vuint32_t tc;
+ vuint32_t pr;
+
+ vuint32_t pc; /* 0x10 */
+ vuint32_t mcr;
+ vuint32_t mr[4]; /* 0x18 */
+ vuint32_t ccr; /* 0x28 */
+ vuint32_t cr0;
+
+ vuint32_t cr1_0; /* 0x30 (only for ct16b0 */
+ vuint32_t cr1_1; /* 0x34 (only for ct16b1 */
+ uint32_t r38;
+ vuint32_t emr;
+
+ uint8_t r40[0x70 - 0x40];
+
+ vuint32_t ctcr; /* 0x70 */
+ vuint32_t pwmc;
+};
+
+extern struct lpc_ct16b lpc_ct16b0, lpc_ct16b1;
+
+#define lpc_ct16b0 (*(struct lpc_ct16b *) 0x4000c000)
+#define lpc_ct16b1 (*(struct lpc_ct16b *) 0x40010000)
+
+#define LPC_CT16B_IR_MR0INT 0
+#define LPC_CT16B_IR_MR1INT 1
+#define LPC_CT16B_IR_MR2INT 2
+#define LPC_CT16B_IR_MR3INT 3
+#define LPC_CT16B_IR_CR0INT 4
+#define LPC_CT16B0_IR_CR1INT 6
+#define LPC_CT16B1_IR_CR1INT 5
+
+#define LPC_CT16B_TCR_CEN 0
+#define LPC_CT16B_TCR_CRST 1
+
+#define LPC_CT16B_MCR_MR0I 0
+#define LPC_CT16B_MCR_MR0R 1
+#define LPC_CT16B_MCR_MR0S 2
+#define LPC_CT16B_MCR_MR1I 3
+#define LPC_CT16B_MCR_MR1R 4
+#define LPC_CT16B_MCR_MR1S 5
+#define LPC_CT16B_MCR_MR2I 6
+#define LPC_CT16B_MCR_MR2R 7
+#define LPC_CT16B_MCR_MR2S 8
+#define LPC_CT16B_MCR_MR3I 9
+#define LPC_CT16B_MCR_MR3R 10
+#define LPC_CT16B_MCR_MR3S 11
+
+#define LPC_CT16B_CCR_CAP0RE 0
+#define LPC_CT16B_CCR_CAP0FE 1
+#define LPC_CT16B_CCR_CAP0I 2
+#define LPC_CT16B0_CCR_CAP1RE 6
+#define LPC_CT16B0_CCR_CAP1FE 7
+#define LPC_CT16B0_CCR_CAP1I 8
+#define LPC_CT16B1_CCR_CAP1RE 3
+#define LPC_CT16B1_CCR_CAP1FE 4
+#define LPC_CT16B1_CCR_CAP1I 5
+
+#define LPC_CT16B_EMR_EM0 0
+#define LPC_CT16B_EMR_EM1 1
+#define LPC_CT16B_EMR_EM2 2
+#define LPC_CT16B_EMR_EM3 3
+#define LPC_CT16B_EMR_EMC0 4
+#define LPC_CT16B_EMR_EMC1 6
+#define LPC_CT16B_EMR_EMC2 8
+#define LPC_CT16B_EMR_EMC3 10
+
+#define LPC_CT16B_EMR_EMC_NOTHING 0
+#define LPC_CT16B_EMR_EMC_CLEAR 1
+#define LPC_CT16B_EMR_EMC_SET 2
+#define LPC_CT16B_EMR_EMC_TOGGLE 3
+
+#define LPC_CT16B_CCR_CTM 0
+#define LPC_CT16B_CCR_CTM_TIMER 0
+#define LPC_CT16B_CCR_CTM_COUNTER_RISING 1
+#define LPC_CT16B_CCR_CTM_COUNTER_FALLING 2
+#define LPC_CT16B_CCR_CTM_COUNTER_BOTH 3
+#define LPC_CT16B_CCR_CIS 2
+#define LPC_CT16B_CCR_CIS_CAP0 0
+#define LPC_CT16B0_CCR_CIS_CAP1 2
+#define LPC_CT16B1_CCR_CIS_CAP1 1
+#define LPC_CT16B_CCR_ENCC 4
+#define LPC_CT16B_CCR_SELCC 5
+#define LPC_CT16B_CCR_SELCC_RISING_CAP0 0
+#define LPC_CT16B_CCR_SELCC_FALLING_CAP0 1
+#define LPC_CT16B0_CCR_SELCC_RISING_CAP1 4
+#define LPC_CT16B0_CCR_SELCC_FALLING_CAP1 5
+#define LPC_CT16B1_CCR_SELCC_RISING_CAP1 2
+#define LPC_CT16B1_CCR_SELCC_FALLING_CAP1 3
+#define LPC_CT16B_CCR_
+
+#define LPC_CT16B_PWMC_PWMEN0 0
+#define LPC_CT16B_PWMC_PWMEN1 1
+#define LPC_CT16B_PWMC_PWMEN2 2
+#define LPC_CT16B_PWMC_PWMEN3 3
+
struct lpc_ct32b {
vuint32_t ir; /* 0x00 */
vuint32_t tcr;
vuint32_t tc;
vuint32_t pr;
-
+
vuint32_t pc; /* 0x10 */
vuint32_t mcr;
vuint32_t mr[4]; /* 0x18 */
vuint32_t ccr; /* 0x28 */
vuint32_t cr0;
-
+
vuint32_t cr1_0; /* 0x30 (only for ct32b0 */
vuint32_t cr1_1; /* 0x34 (only for ct32b1 */
uint32_t r38;
diff --git a/src/lpc/registers.ld b/src/lpc/registers.ld
index a523c39c..61dd9e70 100644
--- a/src/lpc/registers.ld
+++ b/src/lpc/registers.ld
@@ -1,6 +1,8 @@
lpc_usb_sram = 0x20004000;
lpc_usb_endpoint = 0x20004700;
lpc_usart = 0x40008000;
+lpc_ct16b0 = 0x4000c000;
+lpc_ct16b1 = 0x40010000;
lpc_ct32b0 = 0x40014000;
lpc_ct32b1 = 0x40018000;
lpc_adc = 0x4001c000;
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-31 06:55:07 +0000