j3d1/esp-open-rtos
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

fix of #480

Browse source
This commit is contained in:
Gunar Schorcht 2017-11-14 08:23:20 +01:00
parent e0410b2c5d
commit 57c049ac73
1 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
extras/i2c/i2c.c
View file

@ -43,8 +43,8 @@
// Following array contain delay values for different frequencies
// Warning: 1 is minimal, that mean at 80MHz clock, frequency max is 320kHz
const static uint8_t i2c_freq_array[][2] = {
[I2C_FREQ_80K] = {255, 35},
[I2C_FREQ_100K] = {100, 20},
[I2C_FREQ_80K] = {255, 80},
[I2C_FREQ_100K] = {100, 55},
[I2C_FREQ_400K] = {10, 1},
[I2C_FREQ_500K] = {6, 1}
};
@ -150,7 +150,7 @@ static inline bool read_sda(uint8_t bus)
{
gpio_write(i2c_bus[bus].g_sda_pin, 1);
// TODO: Without this delay we get arbitration lost in i2c_stop
i2c_delay(bus);
// i2c_delay(bus);
return gpio_read(i2c_bus[bus].g_sda_pin); // Clock high, valid ACK
}
@ -203,6 +203,9 @@ bool i2c_stop(uint8_t bus)
// Stop bit setup time, minimum 4us
i2c_delay(bus);
// SCL is high, set SDA from 0 to 1
read_sda(bus);
// additional delay before testing SDA value to avoid wrong state
i2c_delay(bus);
if (read_sda(bus) == 0) {
debug("arbitration lost in i2c_stop from bus %u", bus);
}