pi-pico: work on i2c

pi-pico/i2c/Makefile

@@ -0,0 +1,82 @@
+CC = arm-none-eabi-gcc
+AS = arm-none-eabi-as
+LD = arm-none-eabi-ld
+
+OBJDUMP = arm-none-eabi-objdump
+OBJCOPY = arm-none-eabi-objcopy
+#CFLAGS = -g -O2 -Wall
+CFLAGS = -g -O3 -Wall -I..
+CFLAGS += -mlittle-endian -mthumb -mcpu=cortex-m0plus
+CFLAGS += -fno-common
+CFLAGS += -ffunction-sections -fdata-sections
+ASFLAGS =
+
+ELF2UF2	= ../elf2uf2/elf2uf2
+
+##### Project specific libraries #####
+SRC_FILES = i2c-display.c
+
+all:  i2c-display.uf2 i2c-display.dis
+
+clean:
+	rm -f i2c-display.bin i2c-display.elf *~ *.o *.dis *.uf2
+
+crt0.o:	crt0.S
+	$(AS) $(ASFLAGS) -o crt0.o -c crt0.S
+
+#boot2_w25q080.o:	boot2_w25q080.S
+#	$(AS) $(ASFLAGS) -o boot2_w25q080.o -c boot2_w25q080.S
+
+idivmod.o:	idivmod.S
+	$(AS) $(ASFLAGS) -o idivmod.o -c idivmod.S
+
+uldivmod.o:	uldivmod.S
+	$(AS) $(ASFLAGS) -o uldivmod.o -c uldivmod.S
+
+runtime.o:	runtime.c
+	$(CC) $(CFLAGS) -c runtime.c
+
+i2c-display.elf: i2c-display.o \
+	crt0.o bootrom.o runtime.o \
+	mmio.o timer.o clocks.o gpio.o i2c.o idivmod.o uldivmod.o
+	$(LD) -v -Tmemmap_default.ld -nostartfiles -o i2c-display.elf i2c-display.o \
+		bootrom.o crt0.o runtime.o \
+		mmio.o timer.o clocks.o gpio.o i2c.o idivmod.o uldivmod.o
+#		boot2_w25q080.o 
+
+bootrom.o:	bootrom.c
+	$(CC) $(CFLAGS) -c bootrom.c
+
+clocks.o:	clocks.c
+	$(CC) $(CFLAGS) -c clocks.c
+
+timer.o:	timer.c
+	$(CC) $(CFLAGS) -c timer.c
+
+i2c-display.o:	i2c-display.c
+	$(CC) $(CFLAGS) -c i2c-display.c
+
+i2c-display.uf2: i2c-display.elf
+	$(ELF2UF2) i2c-display.elf i2c-display.uf2
+
+i2c-display.dis:	i2c-display.elf
+	$(OBJDUMP) -h i2c-display.elf > i2c-display.dis
+	$(OBJDUMP) -d i2c-display.elf >> i2c-display.dis
+
+####
+
+gpio.o:	gpio.c ../include/gpio.h
+	$(CC) $(CFLAGS) -c gpio.c
+
+####
+
+i2c.o:	i2c.c ./i2c.h
+	$(CC) $(CFLAGS) -c i2c.c
+
+####
+
+mmio.o:	mmio.c
+	$(CC) $(CFLAGS) -c mmio.c
+
+
+

pi-pico/i2c/bootrom.c

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdint.h>
+
+//#include "pico/bootrom.h"
+
+/// \tag::table_lookup[]
+
+// Bootrom function: rom_table_lookup
+// Returns the 32 bit pointer into the ROM if found or NULL otherwise.
+typedef void *(*rom_table_lookup_fn)(uint16_t *table, uint32_t code);
+
+// Convert a 16 bit pointer stored at the given rom address into a 32 bit pointer
+#define rom_hword_as_ptr(rom_address) (void *)(uintptr_t)(*(uint16_t *)rom_address)
+
+void *rom_func_lookup(uint32_t code) {
+    rom_table_lookup_fn rom_table_lookup = (rom_table_lookup_fn) rom_hword_as_ptr(0x18);
+    uint16_t *func_table = (uint16_t *) rom_hword_as_ptr(0x14);
+    return rom_table_lookup(func_table, code);
+}
+
+void *rom_data_lookup(uint32_t code) {
+    rom_table_lookup_fn rom_table_lookup = (rom_table_lookup_fn) rom_hword_as_ptr(0x18);
+    uint16_t *data_table = (uint16_t *) rom_hword_as_ptr(0x16);
+    return rom_table_lookup(data_table, code);
+}
+/// \end::table_lookup[]
+
+int rom_funcs_lookup(uint32_t *table, unsigned int count) {
+    int ok = 1;
+    for (unsigned int i = 0; i < count; i++) {
+        table[i] = (uintptr_t) rom_func_lookup(table[i]);
+        if (!table[i]) ok = 0;
+    }
+    return ok;
+}

pi-pico/i2c/bs2_default_padded_checksummed.S

@@ -0,0 +1,23 @@
+// Padded and checksummed version of: /home/vince/research/vmw-meter.git/pi-pico/pico/pico-examples/build/pico-sdk/src/rp2_common/boot_stage2/bs2_default.bin
+
+.cpu cortex-m0plus
+.thumb
+
+.section .boot2, "ax"
+
+.byte 0x00, 0xb5, 0x32, 0x4b, 0x21, 0x20, 0x58, 0x60, 0x98, 0x68, 0x02, 0x21, 0x88, 0x43, 0x98, 0x60
+.byte 0xd8, 0x60, 0x18, 0x61, 0x58, 0x61, 0x2e, 0x4b, 0x00, 0x21, 0x99, 0x60, 0x02, 0x21, 0x59, 0x61
+.byte 0x01, 0x21, 0xf0, 0x22, 0x99, 0x50, 0x2b, 0x49, 0x19, 0x60, 0x01, 0x21, 0x99, 0x60, 0x35, 0x20
+.byte 0x00, 0xf0, 0x44, 0xf8, 0x02, 0x22, 0x90, 0x42, 0x14, 0xd0, 0x06, 0x21, 0x19, 0x66, 0x00, 0xf0
+.byte 0x34, 0xf8, 0x19, 0x6e, 0x01, 0x21, 0x19, 0x66, 0x00, 0x20, 0x18, 0x66, 0x1a, 0x66, 0x00, 0xf0
+.byte 0x2c, 0xf8, 0x19, 0x6e, 0x19, 0x6e, 0x19, 0x6e, 0x05, 0x20, 0x00, 0xf0, 0x2f, 0xf8, 0x01, 0x21
+.byte 0x08, 0x42, 0xf9, 0xd1, 0x00, 0x21, 0x99, 0x60, 0x1b, 0x49, 0x19, 0x60, 0x00, 0x21, 0x59, 0x60
+.byte 0x1a, 0x49, 0x1b, 0x48, 0x01, 0x60, 0x01, 0x21, 0x99, 0x60, 0xeb, 0x21, 0x19, 0x66, 0xa0, 0x21
+.byte 0x19, 0x66, 0x00, 0xf0, 0x12, 0xf8, 0x00, 0x21, 0x99, 0x60, 0x16, 0x49, 0x14, 0x48, 0x01, 0x60
+.byte 0x01, 0x21, 0x99, 0x60, 0x01, 0xbc, 0x00, 0x28, 0x00, 0xd0, 0x00, 0x47, 0x12, 0x48, 0x13, 0x49
+.byte 0x08, 0x60, 0x03, 0xc8, 0x80, 0xf3, 0x08, 0x88, 0x08, 0x47, 0x03, 0xb5, 0x99, 0x6a, 0x04, 0x20
+.byte 0x01, 0x42, 0xfb, 0xd0, 0x01, 0x20, 0x01, 0x42, 0xf8, 0xd1, 0x03, 0xbd, 0x02, 0xb5, 0x18, 0x66
+.byte 0x18, 0x66, 0xff, 0xf7, 0xf2, 0xff, 0x18, 0x6e, 0x18, 0x6e, 0x02, 0xbd, 0x00, 0x00, 0x02, 0x40
+.byte 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x07, 0x00, 0x00, 0x03, 0x5f, 0x00, 0x21, 0x22, 0x00, 0x00
+.byte 0xf4, 0x00, 0x00, 0x18, 0x22, 0x20, 0x00, 0xa0, 0x00, 0x01, 0x00, 0x10, 0x08, 0xed, 0x00, 0xe0
+.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x74, 0xb2, 0x4e, 0x7a