I am having an issue with the I2C communication between the MCU STM8208C6 and the Ambient Light Sensor APDS 9306-065.
Before any setting is set up during the debugging, the I2C register I2C_SR3 in the field BUSY is 1.
• I checked if there was any short circuit in the SCL and SDA pins, but none was found.
• In the oscilloscope both SDA and SCL pings are high (+3V3) before the start condition.
• I am making use of STM8S/A Standard peripheral library and IAR IDE.
The code for the I2C setup is the following:
void I2C_Config(void)
{
I2C_DeInit();
I2C_Init(
(20000),
(0x00000000),
I2C_DUTYCYCLE_16_9,
I2C_ACK_NONE,
I2C_ADDMODE_7BIT,
(CLK_GetClockFreq() / 1000000));
I2C_Cmd(ENABLE);
}
I have implemented a lock-up recovery function that sends 10 clock signals in the SCL, but the I2C_SR3 remains in BUSY high state.
From time to time I was able to read the Part Number (ID) of the sensor via I2C, but just following that the register I2C_SR3 - BUSYgot stuck in high state, then I was unable to read the other data.
(I such cases the I2C_SR3 - BUSY was in low state when I started the debug, but most of the time it was being initialized in high state and I could not read anything).
I do not think the problem might be in the firmware, the same code had worked in a previous sensor ISL29035.
I just wonder if it might be an internal issue of this sensor or the MCU.
