working tutorial, eval adau 1467 and teensy4.1 to control it, in C

Question

Hello, as i was not able to get a working solution with my esp32 in spi to control my eval adau 1467, this time i will try with another board i have and whose sister (teensy 4.0) was the chosen one by ADI for its tuto. We will try spi and i2c. The goal is to help the community to get started with all the needed details of the actions i will go thru to get the mcu control this eval board.

iravelo · Accepted Answer

Here are the pullup resistors, in full glory..)

iravelo · Answer

finally, this did the trick: 
 Nb : there are pullup resistors on scl and sda lines! 
 
 (my actual wire colors are black for gnd, red for scl, brown for sda, orange for reset) 
 I can scan the I2C bus and detect ADAU1467 on address 0x39, 
 and I also can upload an app from teensy4.1 to DSP , over I2C , and it can boot and run it. 
 Thanks all who contributed and helped. 
 Of course you need to check that in USER_SETTINGS.h, you really have: 
 ...
#elif DSP_TYPE == DSP_TYPE_SIGMA300_350
const int DSP_I2C_ADDR = 0x39
#endif
... 
 and also you need to avoid doing 
 #define USE_SPI false 
 in main.ccp, 
 just do not mention it at all !

iravelo · Answer

Answered with image.

iravelo · Answer

Answered with image.

Harishgowtham · Answer

Hello iraivelo, 
 I have noticed that you connected the SCL and SDA line to pins 1 and 3 of the slave control port (J1) respectively. But it's not going to work because those weren't' connected to the DSP. In our Eval board - Slave control port J1, Pins 5 and 7 are connected to the DSP (pin 38 and 39). 
 Pins 5 and 7 are MISO and SCLK respectively which were multiplexed with SDA and SCL. This is a feature where you can shift between I2C and SPI protocols in software without changing the hardware. For that you have to short pin 1 with 7 and pin 3 with 5. 
 In the context of I2C, now pin 5 is SDA and pin 7 is SCL. Connect that directly from teensy. please refer the below block diagram. 
 
 Regards, 
 Harish

Harishgowtham · Answer

Hello iravelo, 
 If you are using I2C then please note this. 
 The ADDR0 and ADDR1 are those pins who choose the device address. It has different combinations. Look at the below table from the datasheet. 
 
 In our ADAU1467 Eval board , the ADDR0 is tied to IOVDD. which represents a binary one (HIGH) always. So by connecting ADDR1 to GND ( '0' - LOW) OR connecting ADDR1 to 3.3v ( '1' - HIGH), You can get the addresses 0x72 (ADDR1 - LOW) and 0x76 (ADDR1 - HIGH) respectively. 
 In the example code given in that wiki page assumes that both ADDR0 and ADDR1 pins are set to LOW. That's not gonna be true for our Eval board since ADDR0 is tied to IOVDD. So you have to change the binary value in the below code, based on any of these addresses (0x72 or 0x76) that is given in hex. 
 Also keep in mind that the wire library of teensy uses 7-bit addressing. It omits the Read/Write bit. That's why 7 bits were given for addressing in the below code. 
 
 In hardware set up, simply change this - Pin-8 of the slave control port (J1) is ADDR1. Connect it to either ground (0x72) or 3.3v (0x76). In 7-bit addressing it is 0x39 and 0x3B respectively. 
 The other way around is Pin-9 of the slave control port (J1) is ADDR0 .which is already tied to IOVDD. You can leave that as it is for now. You don't really need to touch it now. 
 If you want to change the state then remove that R68 resistor. Refer the schematics for more info. 
 
 So in your set up you have to connect pin 8 to either ground or 3.3v. 
 Regards, 
 Harish

Harishgowtham · Answer

Hello iravelo, 
 I forgot to mention one important thing. 
 Since it is I2C protocol, Please don't forget to add pull up resistors: 
 2.2 k&Omega; from SDA to 3.3V 2.2 k&Omega; from SCL to 3.3V 
 Regards, 
 Harish