/*
* Function called from task's main loop.
*/
void task_ad_spi_at45_worker_func(const struct task_item *task)
{
/*
* Handle to flash device.
*/
spi_device dev;
uint8_t sum;
uint8_t prev_sum = 0;
int i, j;
/*
* Open device connected to SPI bus.
* This will not start any transmission yet.
*/
dev = ad_spi_open(AT45DB011D);
for (;;) {
OS_DELAY(2000);
sum = 0;
/*
* Calculate checksum of 1000 bytes starting from address 0x8000.
* This could be done in one call to at45db_read but this would required to have
* 1000 bytes in buffer. For purpose of demonstration only 10 bytes buffer will
* be used.
* To have accurate checksum flash memory will be locked for all read transactions.
*/
ad_spi_device_acquire(dev);
for (i = 0; i < 1000; i += sizeof(buf)) {
/*
* Read some part of memory, and calculate checksum.
*/
at45db_read(dev, 0x8000 + i, buf, sizeof(buf));
for (j = 0; j < sizeof(buf); ++j) {
sum += buf[j];
}
}
/*
* Device access finished, let other task use it.
*/
ad_spi_device_release(dev);
/*
* If something changed in memory from last checksum computation notify user
* and update checksum.
*/
if (sum != prev_sum) {
uart_printfln_s("Memory updated, checksum now 0x%X", sum);
prev_sum = sum;
}
}
/*
* This task will not use flash for time being, close it.
*/
ad_spi_close(dev);
}
static int flash_read(uint8_t *buf, off_t sector, unsigned int sector_num)
{
int ret = 0;
off_t off;
off = (sector << SECTOR_PGSHIFT);
d_print("Reading %d bytes at offset %lu\r\n",
sector_num << SECTOR_PGSHIFT, off);
ret = at45db_read(off, sector_num << SECTOR_PGSHIFT, buf);
if (ret == -1)
return -EIO;
return sector_num;
}
void menu_ad_spi_at45_print_log_func(const struct menu_item *m, bool checked)
{
char buf[32];
int i;
/*
* Handle to flash device.
*/
spi_device dev;
/*
* Open device connected to SPI bus.
* This will not start any transmission yet.
*/
dev = ad_spi_open(AT45DB011D);
uart_printfln(false, "Start of log:");
/*
* Read records from memory, record is empty when first byte if 0xFF.
* Stop reading on first empty record.
*/
for (i = 0; i < 1024; i += 32) {
/*
* Read just one record at a time.
*/
at45db_read(dev, 0x8000 + i, (uint8_t *) buf, 32);
if (buf[0] == (char) 0xFF) {
break;
}
uart_printfln(false, buf);
}
uart_printfln(false, "End of log");
/*
* This task will not use flash for time being, close it.
*/
ad_spi_close(dev);
}
