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pic16bit: Initial version of port to 16-bit PIC family.
Reference MCU is dsPIC33J256GP506 with 256k ROM and 8k RAM, on the dsPIC DSC Starter Kit board. The REPL works, GC works, pyb module has LED and Switch objects. It passes some tests from the test suite (most it can't run because it doesn't have the Python features enabled).
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‎pic16bit/Makefile‎

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include ../py/mkenv.mk
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# qstr definitions (must come before including py.mk)
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QSTR_DEFS = qstrdefsport.h
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# include py core make definitions
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include ../py/py.mk
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XC16 = /opt/microchip/xc16/v1.24
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CROSS_COMPILE = $(XC16)/bin/xc16-
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PARTFAMILY = dsPIC33F
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PART = 33FJ256GP506
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INC = -I.
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INC += -I..
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INC += -I../lib/mp-readline
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INC += -I../stmhal
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INC += -I$(BUILD)
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INC += -I$(XC16)/include
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INC += -I$(XC16)/support/$(PARTFAMILY)/h
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CFLAGS_PIC16BIT = -mcpu=$(PART) -mlarge-code
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CFLAGS = $(INC) -Wall -Werror -ansi -std=gnu99 -nostdlib $(CFLAGS_PIC16BIT) $(COPT)
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#Debugging/Optimization
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ifeq ($(DEBUG), 1)
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CFLAGS += -O0 -ggdb
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else
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CFLAGS += -O1 -DNDEBUG
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endif
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LDFLAGS = --heap=0 -nostdlib -T $(XC16)/support/$(PARTFAMILY)/gld/p$(PART).gld -Map=$@.map --cref -p$(PART)
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LIBS = -L$(XC16)/lib -L$(XC16)/lib/$(PARTFAMILY) -lc -lm -lpic30 -lp$(PART)
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SRC_C = \
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main.c \
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board.c \
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pic16bit_mphal.c \
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modpyb.c \
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modpybled.c \
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modpybswitch.c \
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stmhal/pybstdio.c \
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stmhal/pyexec.c \
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lib/mp-readline/readline.c \
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SRC_S = \
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# gchelper.s \
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OBJ = $(PY_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o) $(SRC_S:.s=.o))
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all: $(BUILD)/firmware.hex
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$(BUILD)/firmware.hex: $(BUILD)/firmware.elf
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$(ECHO) "Create $@"
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$(Q)$(CROSS_COMPILE)bin2hex $<
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$(BUILD)/firmware.elf: $(OBJ)
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$(ECHO) "LINK $@"
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$(Q)$(LD) $(LDFLAGS) -o $@ $(OBJ) $(LIBS)
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$(Q)size $@
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$(PY_BUILD)/gc.o: CFLAGS += -O1
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$(PY_BUILD)/vm.o: CFLAGS += -O1
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include ../py/mkrules.mk

‎pic16bit/board.c‎

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/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <p33Fxxxx.h>
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#include "board.h"
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/********************************************************************/
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// CPU
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void cpu_init(void) {
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// set oscillator to operate at 40MHz
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// Fosc = Fin*M/(N1*N2), Fcy = Fosc/2
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// Fosc = 7.37M*40/(2*2) = 80Mhz for 7.37M input clock
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PLLFBD = 41; // M=39
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CLKDIVbits.PLLPOST = 0; // N1=2
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CLKDIVbits.PLLPRE = 0; // N2=2
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OSCTUN = 0;
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// initiate clock switch to FRC with PLL
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__builtin_write_OSCCONH(0x01);
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__builtin_write_OSCCONL(0x01);
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// wait for clock switch to occur
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while (OSCCONbits.COSC != 0x01) {
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}
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while (!OSCCONbits.LOCK) {
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}
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}
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/********************************************************************/
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// LEDs
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#define RED_LED_TRIS _TRISC15
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#define YELLOW_LED_TRIS _TRISC13
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#define GREEN_LED_TRIS _TRISC14
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#define RED_LED _LATC15
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#define YELLOW_LED _LATC13
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#define GREEN_LED _LATC14
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#define LED_ON (0)
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#define LED_OFF (1)
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void led_init(void) {
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// set led GPIO as outputs
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RED_LED_TRIS = 0;
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YELLOW_LED_TRIS = 0;
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GREEN_LED_TRIS = 0;
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// turn off the LEDs
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RED_LED = LED_OFF;
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YELLOW_LED = LED_OFF;
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GREEN_LED = LED_OFF;
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}
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void led_state(int led, int state) {
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int val = state ? LED_ON : LED_OFF;
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switch (led) {
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case 1: RED_LED = val; break;
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case 2: YELLOW_LED = val; break;
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case 3: GREEN_LED = val; break;
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}
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}
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void led_toggle(int led) {
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switch (led) {
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case 1: RED_LED ^= 1; break;
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case 2: YELLOW_LED ^= 1; break;
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case 3: GREEN_LED ^= 1; break;
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}
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}
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/********************************************************************/
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// switches
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#define SWITCH_S1_TRIS _TRISD8
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#define SWITCH_S2_TRIS _TRISD9
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#define SWITCH_S1 _RD8
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#define SWITCH_S2 _RD9
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void switch_init(void) {
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// set switch GPIO as inputs
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SWITCH_S1_TRIS = 1;
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SWITCH_S2_TRIS = 1;
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}
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int switch_get(int sw) {
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int val = 1;
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switch (sw) {
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case 1: val = SWITCH_S1; break;
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case 2: val = SWITCH_S2; break;
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}
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return val == 0;
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}
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/********************************************************************/
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// UART
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/*
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// TODO need an irq
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void uart_rx_irq(void) {
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if (c == interrupt_char) {
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MP_STATE_VM(mp_pending_exception) = MP_STATE_PORT(keyboard_interrupt_obj);
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}
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}
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*/
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void uart_init(void) {
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// baudrate = F_CY / 16 (uxbrg + 1)
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// F_CY = 40MHz for us
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UART1.uxbrg = 64; // 38400 baud
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UART1.uxmode = 1 << 15; // UARTEN
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UART1.uxsta = 1 << 10; // UTXEN
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}
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int uart_rx_any(void) {
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return UART1.uxsta & 1; // URXDA
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}
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int uart_rx_char(void) {
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return UART1.uxrxreg;
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}
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void uart_tx_char(int chr) {
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while (UART1.uxsta & (1 << 9)) {
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// tx fifo is full
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}
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UART1.uxtxreg = chr;
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}

‎pic16bit/board.h‎

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/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef __MICROPY_INCLUDED_PIC16BIT_BOARD_H__
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#define __MICROPY_INCLUDED_PIC16BIT_BOARD_H__
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void cpu_init(void);
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void led_init(void);
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void led_state(int led, int state);
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void led_toggle(int led);
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void switch_init(void);
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int switch_get(int sw);
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void uart_init(void);
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int uart_rx_any(void);
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int uart_rx_char(void);
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void uart_tx_char(int chr);
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#endif // __MICROPY_INCLUDED_PIC16BIT_BOARD_H__

‎pic16bit/main.c‎

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/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12+
* copies of the Software, and to permit persons to whom the Software is
13+
* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19+
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <p33Fxxxx.h>
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#include "py/compile.h"
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#include "py/runtime.h"
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#include "py/gc.h"
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#include "pyexec.h"
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#include "readline.h"
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#include MICROPY_HAL_H
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#include "board.h"
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#include "modpyb.h"
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_FGS(GWRP_OFF & GCP_OFF);
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_FOSCSEL(FNOSC_FRC);
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_FOSC(FCKSM_CSECMD & OSCIOFNC_ON & POSCMD_NONE);
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_FWDT(FWDTEN_OFF);
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// maximum heap for device with 8k RAM
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static char heap[4600];
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int main(int argc, char **argv) {
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// init the CPU and the peripherals
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cpu_init();
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led_init();
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switch_init();
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uart_init();
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soft_reset:
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// flash green led for 150ms to indicate boot
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led_state(1, 0);
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led_state(2, 0);
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led_state(3, 1);
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mp_hal_milli_delay(150);
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led_state(3, 0);
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// init MicroPython runtime
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int stack_dummy;
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MP_STATE_VM(stack_top) = (char*)&stack_dummy;
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gc_init(heap, heap + sizeof(heap));
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mp_init();
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mp_hal_init();
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readline_init0();
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// REPL loop
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for (;;) {
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if (pyexec_mode_kind == PYEXEC_MODE_RAW_REPL) {
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if (pyexec_raw_repl() != 0) {
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break;
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}
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} else {
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if (pyexec_friendly_repl() != 0) {
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break;
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}
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}
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}
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printf("PYB: soft reboot\n");
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mp_deinit();
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goto soft_reset;
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}
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void gc_collect(void) {
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// TODO possibly need to trace registers
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void *dummy;
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gc_collect_start();
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// Node: stack is ascending
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gc_collect_root(&dummy, ((mp_uint_t)&dummy - (mp_uint_t)MP_STATE_VM(stack_top)) / sizeof(mp_uint_t));
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gc_collect_end();
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}
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mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
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return NULL;
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}
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mp_import_stat_t mp_import_stat(const char *path) {
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return MP_IMPORT_STAT_NO_EXIST;
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}
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mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args, mp_map_t *kwargs) {
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
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void nlr_jump_fail(void *val) {
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}
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void NORETURN __fatal_error(const char *msg) {
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while (1);
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}
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#ifndef NDEBUG
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void MP_WEAK __assert_func(const char *file, int line, const char *func, const char *expr) {
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printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
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__fatal_error("Assertion failed");
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}
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#endif

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