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Fix possible I2C init errors

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Fix possible I2C init errors
This commit is contained in:
Theo Arends 2019-10-01 16:21:39 +02:00
parent c311632b7a
commit 92c2196e73
1 changed files with 6 additions and 10 deletions
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16
sonoff/support.ino
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@ -1460,8 +1460,8 @@ void I2cScan(char *devs, unsigned int devs_len)
void I2cSetActive(uint32_t addr, uint32_t count = 1) void I2cSetActive(uint32_t addr, uint32_t count = 1)
{ {
addr &= 0x7F; addr &= 0x7F; // Max I2C address is 127
count &= 0x7F; count &= 0x7F; // Max 4 x 32 bits available
while (count-- && (addr < 128)) { while (count-- && (addr < 128)) {
i2c_active[addr / 32] |= (1 << (addr % 32)); i2c_active[addr / 32] |= (1 << (addr % 32));
addr++; addr++;
@ -1471,7 +1471,7 @@ void I2cSetActive(uint32_t addr, uint32_t count = 1)
bool I2cActive(uint32_t addr) bool I2cActive(uint32_t addr)
{ {
addr &= 0x7F; addr &= 0x7F; // Max I2C address is 127
if (i2c_active[addr / 32] & (1 << (addr % 32))) { if (i2c_active[addr / 32] & (1 << (addr % 32))) {
return true; return true;
} }
@ -1480,16 +1480,12 @@ bool I2cActive(uint32_t addr)
bool I2cDevice(uint8_t addr) bool I2cDevice(uint8_t addr)
{ {
addr &= 0x7F; // Max I2C address is 127
if (I2cActive(addr)) { if (I2cActive(addr)) {
return false; // If already active report as not present; return false; // If already active report as not present;
} }
for (uint8_t address = 1; address <= 127; address++) { Wire.beginTransmission(addr);
Wire.beginTransmission(address); return (0 == Wire.endTransmission());
if (!Wire.endTransmission() && (address == addr)) {
return true; // Report as present;
}
}
return false;
} }
#endif // USE_I2C #endif // USE_I2C