int32_t w1_read_temp(struct w1_dev *dev, unsigned long flags)
{
static uint8_t scratchpad[8];
int class = w1_class(dev);
int32_t res;
int16_t cval;
int i;
/* The caller is expected to have checked the class. but still... */
switch(class) {
case 0x10: case 0x28: case 0x42:
break; /* Supported, at least for temperature input */
default:
return 1l<<31; /* very negative */
}
/* If so asked, jump over start-conversion and only collect result */
if (flags & W1_FLAG_COLLECT)
goto collect;
w1_match_rom(dev);
w1_write_byte(dev->bus, W1_CMDT_CONVERT);
/* If so asked, don't wait for the conversion to be over */
if (flags & W1_FLAG_NOWAIT)
return 0;
while(bathos_w1_ops.read_bit(dev->bus) == 0)
;
collect:
w1_match_rom(dev);
w1_write_byte(dev->bus, W1_CMDT_R_SPAD);
for (i = 0; i < sizeof(scratchpad); i++)
scratchpad[i] = w1_read_byte(dev->bus);
res = 0;
cval = scratchpad[1] << 8 | scratchpad[0];
switch(class) {
case 0x10:
/* 18S20: two bytes plus "count remain" value */
res = (int32_t)cval << 15; /* 1 decimal points */
res -= 0x4000; /* - 0.25 degrees */
res |= scratchpad[6] << 12; /* 1/16th of degree each */
break;
case 0x28:
case 0x42:
/* 18B20 and DS28EA00: only the two bytes */
res = (int32_t)cval << 12; /* 4 decimal points */
break;
}
return res;
}
int w1_write_eeprom(struct w1_dev *dev, int offset, const uint8_t *buffer,
int blen)
{
int i;
int read_data;
w1_match_rom(dev);
w1_write_byte(dev->bus, W1_CMDR_W_SPAD);
/* write of target addr */
w1_write_byte(dev->bus, LSB_ADDR(offset));
w1_write_byte(dev->bus, MSB_ADDR(offset));
/* write to scratchpad */
for (i = 0; i < blen; i++)
w1_write_byte(dev->bus, buffer[i]);
for (; i < 32; i++)
w1_write_byte(dev->bus, '\0'); /*padding */
w1_match_rom(dev);
w1_write_byte(dev->bus, W1_CMDR_C_SPAD);
/* copy to memory */
w1_write_byte(dev->bus, LSB_ADDR(offset));
w1_write_byte(dev->bus, MSB_ADDR(offset));
/* ending offset/data status byte */
w1_write_byte(dev->bus, 0x1f);
usleep(10000);
/* check final status byte */
read_data = w1_read_byte(dev->bus);
if (read_data != 0xaa)
return -1;
return 0;
}
int w1_read_eeprom(struct w1_dev *dev, int offset, uint8_t *buffer, int blen)
{
int i;
w1_match_rom(dev);
w1_write_byte(dev->bus, W1_CMDR_R_MEMORY);
/* read of target addr */
w1_write_byte(dev->bus, LSB_ADDR(offset));
w1_write_byte(dev->bus, MSB_ADDR(offset));
for (i = 0; i < blen; i++)
buffer[i] = w1_read_byte(dev->bus);
return 0;
}
static int handle_1w(const char *line)
{
if (strncmp(line, "read", 4) == 0 && line[4] != '_') {
int n = 1;
if (line[4] == ' ')
n = undec(line+5);
if (n < 1) {
printf("\nERROR:arguments\n");
return 0;
}
printf("1WIRE DATA");
while (n--) {
int r = w1_read(w1);
if (r < 0) {
printf("\nERROR:%i\n", r);
return 0;
}
printf(" %02x", r);
}
printf("\nOK\n");
} else
if (strncmp(line, "write ", 6) == 0) {
line += 5;
int written = 0;
while (line[0] == ' ') {
int data = unhex8(line+1);
if (data < 0)
break;
int r = w1_write(w1, data);
if (r < 0) {
printf("ERROR:%i\n", r);
return 0;
}
line += 3;
written++;
}
printf("OK:%i\n", written);
} else
if (strncmp(line, "read_rom", 8) == 0) {
w1_addr_t addr;
int r = w1_read_rom(w1, &addr);
if (r < 0) {
printf("ERROR:%i\n", r);
return 0;
}
u8 *b = addr.bytes;
printf("OK:%02x%02x%02x%02x%02x%02x%02x%02x\n",
b[0], b[1], b[2], b[3],
b[4], b[5], b[6], b[7]);
} else
if (strncmp(line, "match_rom ", 10) == 0) {
w1_addr_t addr;
w1_unpack(&addr, line+10);
int r = w1_match_rom(w1, addr);
if (r < 0) {
printf("ERROR:%i\n", r);
return 0;
}
printf("OK\n");
} else
if (strncmp(line, "skip_rom", 8) == 0) {
int r = w1_skip_rom(w1);
if (r < 0) {
printf("ERROR:%i\n", r);
return 0;
}
printf("OK\n");
} else
if (strcmp(line, "scan") == 0) {
w1_addr_t addrs[5];
int n = w1_scan(w1, addrs, 5);
if (n <= 0) {
printf("ERROR:%i\n", n);
return 0;
}
printf("OK:%i 1-wire devices:\n", n);
int i;
for (i=0; i<n; i++) {
u8 *b = addrs[i].bytes;
printf("1WIRE DEV %02x%02x%02x%02x%02x%02x%02x%02x\n",
b[0], b[1], b[2], b[3],
b[4], b[5], b[6], b[7]);
}
} else
if (strcmp(line, "scan_read") == 0) {
w1_addr_t addrs[5];
int n = w1_scan(w1, addrs, 5);
if (n <= 0) {
printf("ERROR:%i\n", n);
return 0;
}
printf("OK:%i 1-wire devices:\n", n);
int i;
for (i=0; i<n; i++) {
u8 *b = addrs[i].bytes;
if (addrs[i].bytes[0] == FAMILY_DS18B20) {
s16 temp;
u8 tmp[9];
w1_match_rom(w1, addrs[i]);
w1_write(w1, 0x44); /* conversion */
mdelay(750); /* 750ms conversion time */
w1_match_rom(w1, addrs[i]);
w1_write(w1, 0xbe); /* read */
int j;
for (j=0; j<9; j++)
tmp[j] = w1_read(w1);
if (crc8r(tmp, 9) != 0)
continue;
temp = tmp[1]<<8 | tmp[0];
printf("1WIRE DS18B20 %02x%02x%02x%02x%02x%02x%02x%02x ",
b[0], b[1], b[2], b[3],
b[4], b[5], b[6], b[7]);
if (temp < 0) {
printf("-");
temp = -temp;
}
printf("%i.%02i\n", temp>>4, 100*(temp&0xf)/16);
} else {