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canboot: add application code check

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Enter the bootloader if the first block of the application area contains 0xFF.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
This commit is contained in:
Arksine 2021-02-07 12:52:34 -05:00
parent 4cd17a6f5e
commit 1d2ce10dbd
1 changed files with 16 additions and 3 deletions
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19
src/canboot_main.c
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@ -214,6 +214,19 @@ canboot_process_rx(uint32_t id, uint32_t len, uint8_t *data)
}
}
static inline uint8_t
check_application_code(void)
{
// Read the first block of memory, if it
// is all 0xFF then no application has been flashed
flash_read_block(0, (uint32_t*)page_buffer);
for (uint8_t i = 0; i < CONFIG_BLOCK_SIZE; i++) {
if (page_buffer[i] != 0xFF)
return 1;
}
return 0;
}
/****************************************************************
* Startup
@ -252,9 +265,9 @@ void
canboot_main(void)
{
uint16_t mkey = read_magic_key();
// Attempt to enter the bootloader. This function should not
// return
if (mkey == CONFIG_MAGIC_KEY)
// Enter the bootloader if the magic key has been set or if
// no application has been flashed
if (mkey == CONFIG_MAGIC_KEY || !check_application_code())
enter_bootloader();
// set magic key and delay for one second. This enters the bootloader if