razzor/twiboot
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Fix sizeof(VERSION_STRING)

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- sizeof(info) should not be increased (16->18) since the size is never
  exchanged with the I2C master. Also using a non 2^x size will result
  in bigger code since the compiler can no longer use a simple AND to
  implement the bcnt %= sizeof(info).

- when using a info[16] the firmware is small enough to fit in a 512
  word bootloader again :)
This commit is contained in:
Olaf Rempel 2015-03-21 09:15:43 +01:00
parent 31d65c76d7
commit bc5d45359a
2 changed files with 4 additions and 4 deletions
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4
Makefile
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@ -42,9 +42,9 @@ endif
ifeq ($(MCU), atmega328p) ifeq ($(MCU), atmega328p)
# (8Mhz internal RC-Osz., 2.7V BOD) # (8Mhz internal RC-Osz., 2.7V BOD)
AVRDUDE_MCU=m328p -F AVRDUDE_MCU=m328p -F
AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xda:m efuse:w:0xfd:m AVRDUDE_FUSES=lfuse:w:0xc2:m hfuse:w:0xdc:m efuse:w:0xfd:m
BOOTLOADER_START=0x7800 BOOTLOADER_START=0x7C00
endif endif
# --------------------------------------------------------------------------- # ---------------------------------------------------------------------------

4
main.c
View File

@ -55,7 +55,7 @@
#define SIGNATURE_BYTES 0x1E, 0x94, 0x06 #define SIGNATURE_BYTES 0x1E, 0x94, 0x06
#elif defined (__AVR_ATmega328P__) #elif defined (__AVR_ATmega328P__)
#define VERSION_STRING "TWIBOOT m328pv2.1" #define VERSION_STRING "TWIBOOTm328pv2.1"
#define SIGNATURE_BYTES 0x1E, 0x95, 0x0F #define SIGNATURE_BYTES 0x1E, 0x95, 0x0F
#else #else
@ -154,7 +154,7 @@
* SLA+W, 0x02, 0x02, addrh, addrl, {* bytes}, STO * SLA+W, 0x02, 0x02, addrh, addrl, {* bytes}, STO
*/ */
const static uint8_t info[18] = VERSION_STRING; const static uint8_t info[16] = VERSION_STRING;
const static uint8_t chipinfo[8] = { const static uint8_t chipinfo[8] = {
SIGNATURE_BYTES, SIGNATURE_BYTES,