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Merge pull request #2322 from peturdainn/peturdainn-patch-1 

fix for ds18b20 negative decimals
This commit is contained in:
Terry Ellison 2018-04-27 11:35:07 +01:00 committed by GitHub
parent 53e44d5ece a1e02fc6a8
commit 45fea23d66
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 2 deletions
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6
app/modules/ds18b20.c
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@ -197,6 +197,7 @@ static int ds18b20_lua_read(lua_State *L) {
static int ds18b20_read_device(uint8_t *ds18b20_device_rom) {
lua_State *L = lua_getstate();
int16_t ds18b20_raw_temp;
if (onewire_crc8(ds18b20_device_rom,7) == ds18b20_device_rom[7]) {
@ -221,8 +222,9 @@ static int ds18b20_read_device(uint8_t *ds18b20_device_rom) {
lua_pushfstring(L, "%d:%d:%d:%d:%d:%d:%d:%d", ds18b20_device_rom[0], ds18b20_device_rom[1], ds18b20_device_rom[2], ds18b20_device_rom[3], ds18b20_device_rom[4], ds18b20_device_rom[5], ds18b20_device_rom[6], ds18b20_device_rom[7]);
ds18b20_device_scratchpad_conf = (ds18b20_device_scratchpad[4] >> 5) + 9;
ds18b20_device_scratchpad_temp = ((int8_t)(ds18b20_device_scratchpad[1] << 4) + (ds18b20_device_scratchpad[0] >> 4) + ((double)(ds18b20_device_scratchpad[0] & 0x0F) / 16));
ds18b20_device_scratchpad_temp_dec = ((double)(ds18b20_device_scratchpad[0] & 0x0F) / 16 * 1000);
ds18b20_raw_temp = ((ds18b20_device_scratchpad[1] << 8) | ds18b20_device_scratchpad[0]);
ds18b20_device_scratchpad_temp = (double)ds18b20_raw_temp / 16;
ds18b20_device_scratchpad_temp_dec = (ds18b20_raw_temp - (ds18b20_raw_temp / 16 * 16)) * 1000 / 16;
if (ds18b20_device_scratchpad_conf >= ds18b20_device_res) {
ds18b20_device_res = ds18b20_device_scratchpad_conf;