Scratch debugging

src/board/system76/galp3-c/scratch/main.c

@@ -1,4 +1,5 @@
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdint.h>
 
 #include <scratch/pmc.h>
@@ -33,6 +34,14 @@ enum PmcState {
     PMC_STATE_WRITE,
 };
 
+void puthex(uint8_t data) {
+    if (data <= 9) {
+        putchar(data + '0');
+    } else {
+        putchar(data + 'A');
+    }
+}
+
 static void pmc_event(struct Pmc * pmc) {
     static enum PmcState state = PMC_STATE_DEFAULT;
 
@@ -40,6 +49,10 @@ static void pmc_event(struct Pmc * pmc) {
     if (sts & PMC_STS_IBF) {
         uint8_t data = pmc_read(pmc);
         if (sts & PMC_STS_CMD) {
+            puthex((data >> 4) & 0xF);
+            puthex(data & 0xF);
+            putchar('\n');
+
             switch (state) {
                 case PMC_STATE_DEFAULT:
                     switch (data) {

src/board/system76/galp3-c/scratch/scratch.mk

@@ -1,4 +1,17 @@
-SCRATCH_OBJ=$(patsubst src/%.c,$(BUILD)/%.rel,$(SCRATCH_SRC))
+# Enable I2C debugging
+SCRATCH_SRC+=\
+	src/common/i2c.c \
+	src/ec/$(EC)/i2c.c
+SCRATCH_INCLUDE+=\
+	src/common/include/common/*.h \
+	src/ec/$(EC)/include/ec/*.h
+SCRATCH_CFLAGS+=\
+	-Isrc/common/include \
+	-Isrc/ec/$(EC)/include \
+	-DI2C_DEBUGGER=0x76
+
+SCRATCH_BUILD=$(BUILD)/scratch
+SCRATCH_OBJ=$(patsubst src/%.c,$(SCRATCH_BUILD)/%.rel,$(SCRATCH_SRC))
 SCRATCH_CC=\
 	sdcc \
 	-mmcs51 \
@@ -7,21 +20,21 @@ SCRATCH_CC=\
 	--Werror
 
 # Convert from binary file to C header
-$(BUILD)/include/scratch.h: $(BUILD)/scratch.rom
+$(BUILD)/include/scratch.h: $(SCRATCH_BUILD)/scratch.rom
 	@mkdir -p $(@D)
 	xxd --include < $< > $@
 
 # Convert from Intel Hex file to binary file
-$(BUILD)/scratch.rom: $(BUILD)/scratch.ihx
+$(SCRATCH_BUILD)/scratch.rom: $(SCRATCH_BUILD)/scratch.ihx
 	@mkdir -p $(@D)
 	makebin -p < $< > $@
 
 # Link object files into Intel Hex file
-$(BUILD)/scratch.ihx: $(SCRATCH_OBJ)
+$(SCRATCH_BUILD)/scratch.ihx: $(SCRATCH_OBJ)
 	@mkdir -p $(@D)
 	$(SCRATCH_CC) -o $@ $^
 
 # Compile C files into object files
-$(SCRATCH_OBJ): $(BUILD)/%.rel: src/%.c $(SCRATCH_INCLUDE)
+$(SCRATCH_OBJ): $(SCRATCH_BUILD)/%.rel: src/%.c $(SCRATCH_INCLUDE)
 	@mkdir -p $(@D)
 	$(SCRATCH_CC) $(SCRATCH_CFLAGS) -o $@ -c $<

src/board/system76/galp3-c/scratch/stdio.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+#ifdef SERIAL_DEBUGGER
+    #include <mcs51/8051.h>
+#endif
+
+#ifdef I2C_DEBUGGER
+    #include <common/i2c.h>
+#endif
+
+int putchar(int c) {
+    unsigned char byte = (unsigned char)c;
+    if (byte == '\n') putchar('\r');
+#ifdef SERIAL_DEBUGGER
+    SBUF = byte;
+#endif
+#ifdef I2C_DEBUGGER
+    i2c_send(I2C_DEBUGGER, &byte, 1);
+#endif
+    return (int)byte;
+}