summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorDaniel Friesel <derf@finalrewind.org>2018-10-19 09:01:36 +0200
committerDaniel Friesel <derf@finalrewind.org>2018-10-19 09:01:36 +0200
commit255085d06a75c424cd6b95aaac10056e5de65876 (patch)
tree345a6bb1772089e4928e88f5035648f82b51531e
parent458c89d71c3aa22eb5e83d4e34930a8978c0ef7e (diff)
arduino nano: support additional CPU frequencies
-rw-r--r--src/arch/arduino-nano-168/Makefile.inc29
-rw-r--r--src/arch/arduino-nano/Makefile.inc10
-rw-r--r--src/arch/arduino-nano/arch.cc36
-rw-r--r--src/arch/arduino-nano/driver/stdout.cc5
4 files changed, 74 insertions, 6 deletions
diff --git a/src/arch/arduino-nano-168/Makefile.inc b/src/arch/arduino-nano-168/Makefile.inc
index 534ac27..a56e62a 100644
--- a/src/arch/arduino-nano-168/Makefile.inc
+++ b/src/arch/arduino-nano-168/Makefile.inc
@@ -7,7 +7,8 @@ BAUD = 19200
cpu_freq ?= 16000000
COMMON_FLAGS += -Werror=overflow
-COMMON_FLAGS += -mmcu=${MCU} -DF_CPU=16000000UL -DMULTIPASS_ARCH_arduino_nano
+COMMON_FLAGS += -mmcu=${MCU} -DMULTIPASS_ARCH_arduino_nano
+COMMON_FLAGS += -DF_CPU=${cpu_freq}UL
COMMON_FLAGS += -flto
COMMON_FLAGS += -DMULTIPASS_ARCH_HAS_I2C
@@ -39,6 +40,30 @@ ifneq ($(findstring timer,${arch_drivers}), )
TARGETS += src/arch/arduino-nano/driver/timer.cc
endif
+ifeq (${cpu_freq}, 16000000)
+ uart_baud = 57600
+else ifeq (${cpu_freq}, 8000000)
+ uart_baud = 38400
+else ifeq (${cpu_freq}, 4000000)
+ uart_baud = 38400
+else ifeq (${cpu_freq}, 2000000)
+ uart_baud = 19200
+else ifeq (${cpu_freq}, 1000000)
+ uart_baud = 9600
+else ifeq (${cpu_freq}, 500000)
+ uart_baud = 4800
+else ifeq (${cpu_freq}, 250000)
+ uart_baud = 2400
+else ifeq (${cpu_freq}, 125000)
+ uart_baud = 1200
+else ifeq (${cpu_freq}, 62500)
+ uart_baud = 300
+else
+ uart_baud = 9600
+endif
+
+COMMON_FLAGS += -DBAUD=${uart_baud}UL
+
OBJECTS = ${TARGETS:.cc=.o}
.cc.o:
@@ -58,7 +83,7 @@ arch_clean:
${QUIET}rm -f ${OBJECTS} build/system.hex
monitor:
- ${QUIET}screen ${PORT} 115200
+ ${QUIET}screen ${PORT} ${uart_baud}
arch_help:
@echo "arduino-nano specific flags:"
diff --git a/src/arch/arduino-nano/Makefile.inc b/src/arch/arduino-nano/Makefile.inc
index bb51b6c..08dd6c1 100644
--- a/src/arch/arduino-nano/Makefile.inc
+++ b/src/arch/arduino-nano/Makefile.inc
@@ -7,7 +7,7 @@ BAUD = 57600
cpu_freq ?= 16000000
COMMON_FLAGS += -Werror=overflow
-COMMON_FLAGS += -mmcu=${MCU} -DF_CPU=16000000UL -DMULTIPASS_ARCH_arduino_nano
+COMMON_FLAGS += -mmcu=${MCU} -DMULTIPASS_ARCH_arduino_nano
COMMON_FLAGS += -flto
COMMON_FLAGS += -DMULTIPASS_ARCH_HAS_I2C
@@ -39,6 +39,12 @@ ifneq ($(findstring timer,${arch_drivers}), )
TARGETS += src/arch/arduino-nano/driver/timer.cc
endif
+ifneq (${cpu_freq}, )
+ COMMON_FLAGS += -DF_CPU=${cpu_freq}UL
+else
+ COMMON_FLAGS += -DF_CPU=16000000UL
+endif
+
OBJECTS = ${TARGETS:.cc=.o}
.cc.o:
@@ -58,7 +64,7 @@ arch_clean:
${QUIET}rm -f ${OBJECTS} build/system.hex
monitor:
- ${QUIET}screen ${PORT} 115200
+ ${QUIET}screen ${PORT} 19200
arch_help:
@echo "arduino-nano specific flags:"
diff --git a/src/arch/arduino-nano/arch.cc b/src/arch/arduino-nano/arch.cc
index b034348..2d957fc 100644
--- a/src/arch/arduino-nano/arch.cc
+++ b/src/arch/arduino-nano/arch.cc
@@ -5,6 +5,37 @@
void Arch::setup(void)
{
+
+#if F_CPU == 16000000UL
+ /* default */
+#elif F_CPU == 8000000UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS0);
+#elif F_CPU == 4000000UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS1);
+#elif F_CPU == 2000000UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS1) | _BV(CLKPS0);
+#elif F_CPU == 1000000UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS2);
+#elif F_CPU == 500000UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS2) | _BV(CLKPS0);
+#elif F_CPU == 250000UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS2) | _BV(CLKPS1);
+#elif F_CPU == 125000UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS2) | _BV(CLKPS1) | _BV(CLKPS0);
+#elif F_CPU == 62500UL
+ CLKPR = _BV(CLKPCE);
+ CLKPR = _BV(CLKPS3);
+#else
+#error Unsupported F_CPU
+#endif
+
#ifdef TIMER_CYCLES
TCCR0A = 0;
TCCR0B = _BV(CS00);
@@ -13,11 +44,14 @@ void Arch::setup(void)
#if defined(WITH_LOOP) || defined(TIMER_S)
TCCR1A = 0;
TCCR1B = _BV(WGM12) | _BV(CS12) | _BV(CS10); // /1024
- OCR1A = 15625;
+ OCR1A = F_CPU / 1024;
TIMSK1 = _BV(OCIE1A);
#endif
#ifdef TIMER_US
+#if F_CPU != 16000000UL
+#error TIMER_US is only supported with F_CPU = 16MHz
+#endif
// 16MHz/8 -> 2MHz timer
TCCR2A = 0;
TCCR2B = _BV(CS21);
diff --git a/src/arch/arduino-nano/driver/stdout.cc b/src/arch/arduino-nano/driver/stdout.cc
index a3d905d..58ff440 100644
--- a/src/arch/arduino-nano/driver/stdout.cc
+++ b/src/arch/arduino-nano/driver/stdout.cc
@@ -2,7 +2,10 @@
#include <avr/io.h>
#include <avr/interrupt.h>
-#define BAUD 119200L
+#ifndef BAUD
+#define BAUD 9600UL
+#endif
+
#include <util/setbaud.h>
void StandardOutput::setup()