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Check rows before running hello_otp example #555

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Sep 27, 2024
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Check rows before running hello_otp example #555

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19 changes: 19 additions & 0 deletions otp/hello_otp/hello_otp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,25 @@ int main() {
// Row to write raw data
uint16_t raw_row = 0x410;

// Check rows are empty - else the rest of the tests won't behave as expected
unsigned char initial_data[32] = {0};
cmd.flags = ecc_row;
ret = rom_func_otp_access(initial_data, sizeof(initial_data)/2, cmd);
if (ret) {
printf("ERROR: Initial ECC Row Read failed with error %d\n", ret);
}
cmd.flags = raw_row;
ret = rom_func_otp_access(initial_data+(sizeof(initial_data)/2), sizeof(initial_data)/2, cmd);
if (ret) {
printf("ERROR: Initial Raw Row Read failed with error %d\n", ret);
}
for (int i=0; i < sizeof(initial_data); i++) {
if (initial_data[i] != 0) {
printf("ERROR: This example requires empty OTP rows to run - change the ecc_row and raw_row variables to an empty row and recompile\n");
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Minor nitpick: I wonder if "to an empty row" should have been "to empty rows", in case people misinterpret "change the ecc_row and raw_row variables to an empty row" to mean "set them to the same empty row"?

return 0;
}
}

if (ecc_row) {
// Write an ECC value to OTP - the buffer must have a multiple of 2 length for ECC data
unsigned char ecc_write_data[16] = "Hello from OTP";
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