ghnotgood opened a new pull request, #17478:
URL: https://github.com/apache/nuttx/pull/17478
## Summary
We need a way to set Block Protect of an EEPROM.
I am happy to discuss other possibilities.
## Impact
EEPROM driver may use ioctl to set Block Protect bits.
## Testing
I wrote a program `foo` to test read/write to the EEPROM:
```
$ tio /dev/ttyUSB0
[17:16:22.306] tio 3.9
[17:16:22.306] Press ctrl-t q to quit
[17:16:22.323] Connected to /dev/ttyUSB0
__start: Reset status: 00:00
NuttShell (NSH) NuttX-12.11.0
nsh> foo r &
foo [3:100]
nsh> IAI21121AR06,BR07,CR05
J24,J25,J29:2-3
closed with 0
foo w &
foo [4:100]
nsh> written 3
closed with 0
nsh> foo r &
foo [5:100]
nsh> barIAI21121AR06,BR07,CR05
J24,J25,J29:2-3
closed with 0
nsh> foo v &
foo [6:100]
nsh> written 3
closed with 0
nsh> foo r &
foo [7:100]
nsh> IAI21121AR06,BR07,CR05
J24,J25,J29:2-3
closed with 0
nsh> foo 1
ioctl returns 0
closed with 0
nsh> foo r &
foo [9:100]
nsh> IAI21121AR06,BR07,CR05
J24,J25,J29:2-3
closed with 0
nsh> foo w &
foo [10:100]
nsh> written 3
closed with 0
nsh> foo r &
foo [11:100]
nsh> IAI21121AR06,BR07,CR05
J24,J25,J29:2-3
closed with 0
nsh>
```
the `foo` is compiled from the `main.c` (just test app, not to be included
in NuttX):
```
#include <fcntl.h> /* open */
#include <unistd.h> /* close, read, write */
#include <stdio.h> /* printf */
#include <sys/ioctl.h> /* ioctl */
#include <nuttx/eeprom/eeprom.h> /* EEPIOC_BLOCKPROTECT */
#define BLEN 100
static void
print_buff(char const *b, size_t len)
{
while (len--) {
putchar(*b++);
}
putchar('\n');
putchar('\n');
}
int
main(int argc, char **argv)
{
int r;
char b[BLEN];
int fd = open("/dev/eeprom0", O_RDWR);
if (-1 == fd) {
printf("ERROR: Failed to open /dev/eeprom0");
return 1;
}
if (2 == argc) {
switch (argv[1][0]) {
case 'a':
while (0 < (r = read(fd, b, BLEN))) {
print_buff(b, BLEN);
}
break;
case 'r':
r = read(fd, b, BLEN);
print_buff(b, BLEN);
break;
case 'w':
r = write(fd, "bar", 3);
printf("written %d\n", r);
break;
case 'v':
b[0] = 0x00;
b[1] = 0x00;
b[2] = 0x00;
r = write(fd, b, 3);
printf("written %d\n", r);
break;
case '0':
r = ioctl(fd, EEPIOC_BLOCKPROTECT, 0);
printf("ioctl returns %d\n", r);
break;
case '1':
r = ioctl(fd, EEPIOC_BLOCKPROTECT, 3);
printf("ioctl returns %d\n", r);
break;
default:
printf("just chilling\n");
}
}
r = close(fd);
printf("closed with %d\n", r);
return 0;
}
```
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