ESP32 ethernet, SPI, JTAG pin questions
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- Posts: 7
- Joined: Mon Oct 24, 2016 12:39 pm
ESP32 ethernet, SPI, JTAG pin questions
Hello,
I am working on ESP-32 Wroom module. I want to know about how can I interface RMII signals to the MCU as I need Ethernet connection!!!!!!!
As there are different pins for MDC_out(any GPIO given in datasheet), MDI_in, MDO_out......
And for REF_CLK, can I connect it with EMAC_Tx_CLK ? Both are same or different??
Also for SPI interface I saw few discussion based on SPI signals(MTDI, MTCK, MTMS, MTDO). Please try to solve my confusion related to MISO, MOSI, SCK, CS... Which signal is related to MTDI/MTCK/MTMS/MTDO??
Try to reply ASAP
Thank you
I am working on ESP-32 Wroom module. I want to know about how can I interface RMII signals to the MCU as I need Ethernet connection!!!!!!!
As there are different pins for MDC_out(any GPIO given in datasheet), MDI_in, MDO_out......
And for REF_CLK, can I connect it with EMAC_Tx_CLK ? Both are same or different??
Also for SPI interface I saw few discussion based on SPI signals(MTDI, MTCK, MTMS, MTDO). Please try to solve my confusion related to MISO, MOSI, SCK, CS... Which signal is related to MTDI/MTCK/MTMS/MTDO??
Try to reply ASAP
Thank you
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- Posts: 9757
- Joined: Thu Nov 26, 2015 4:08 am
Re: ESP32 hardware pin questions
Please see http://www.espressif.com/sites/default/ ... t_en_0.pdf for documentation on which pins connect to the Ethernet MAC.
MTDI/MTDO/... are JTAG signals and don't have anything to do with SPI. You can look up the pins for SPI in the above document as well. If you don't mind a latency of 2 80MHz clock cycles and a slower SPI slave mode speed, you can also route the SPI pins to any other GPIO as well.
MTDI/MTDO/... are JTAG signals and don't have anything to do with SPI. You can look up the pins for SPI in the above document as well. If you don't mind a latency of 2 80MHz clock cycles and a slower SPI slave mode speed, you can also route the SPI pins to any other GPIO as well.
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- Posts: 7
- Joined: Mon Oct 24, 2016 12:39 pm
RMII Interface
Hi,
As I'm using Wroom-32 and I want to use RMII Interface then which pin provides 50MHz of clock output as a reference clock for PHY transceiver??? Either GPIO16(EMAC_CLOCK_OUT) or GPIO17(EMAC_CLOCK_OUT_180).....
And also, what will be the output of CLOCK_OUT1(IO0), CLOCK_OUT2(IO3) and CLOCK_OUT3(IO1)???
As I'm using Wroom-32 and I want to use RMII Interface then which pin provides 50MHz of clock output as a reference clock for PHY transceiver??? Either GPIO16(EMAC_CLOCK_OUT) or GPIO17(EMAC_CLOCK_OUT_180).....
And also, what will be the output of CLOCK_OUT1(IO0), CLOCK_OUT2(IO3) and CLOCK_OUT3(IO1)???
Re: RMII Interface
Ankit Nikumbh wrote:Hi,
As I'm using Wroom-32 and I want to use RMII Interface then which pin provides 50MHz of clock output as a reference clock for PHY transceiver??? Either GPIO16(EMAC_CLOCK_OUT) or GPIO17(EMAC_CLOCK_OUT_180).....
And also, what will be the output of CLOCK_OUT1(IO0), CLOCK_OUT2(IO3) and CLOCK_OUT3(IO1)???
push!
1++
why this not work for use RMII CLK Out ?
Code: Select all
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO16_U, FUNC_GPIO16_EMAC_CLK_OUT);
see no CLK set. is this the standard 50MHz CLK or how we can set/use FUNC_GPIO16_EMAC_CLK_OUT
can we use this in silicon V1 ?
best wishes
rudi
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love it, change it or leave it.
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Re: ESP32 ethernet, SPI, JTAG pin questions
push
1++
Does anyone in Espressif have any details on actually getting the emac to work with rmii (specifically with 50MHz clock out to clock the rmii)?
1++
Does anyone in Espressif have any details on actually getting the emac to work with rmii (specifically with 50MHz clock out to clock the rmii)?
Re: ESP32 ethernet, SPI, JTAG pin questions
push
+1
https://github.com/espressif/esp-idf/issues/372
we play now more as 5 days only in this, now its time to say from espressif team:
- Yes it run..
- you must use this hardware...
- you must use this hardware reference ..
- here is the link
or
- no, just in time not supportet, its an theoretical example
I can not believe that this example was even tried at espressif and it works.
Recently a pin was added which switched the PHY Power.
https://github.com/espressif/esp-idf/co ... 134355011e
the ip get function is based on wifi station and ap ip function
https://esp32.com/viewtopic.php?f=2&t=1249&p=5518#p5518
btw the question is unanswered - not sure is this the reason for not get an ip
I hate this quiet question
We all sit at the pc and wait for reply!
And if it's just a "we're testing that ..."
+1
https://github.com/espressif/esp-idf/issues/372
we play now more as 5 days only in this, now its time to say from espressif team:
- Yes it run..
- you must use this hardware...
- you must use this hardware reference ..
- here is the link
or
- no, just in time not supportet, its an theoretical example
I can not believe that this example was even tried at espressif and it works.
Recently a pin was added which switched the PHY Power.
https://github.com/espressif/esp-idf/co ... 134355011e
the ip get function is based on wifi station and ap ip function
https://esp32.com/viewtopic.php?f=2&t=1249&p=5518#p5518
btw the question is unanswered - not sure is this the reason for not get an ip
I hate this quiet question
We all sit at the pc and wait for reply!
And if it's just a "we're testing that ..."
Last edited by rudi ;-) on Sun Feb 26, 2017 7:13 pm, edited 1 time in total.
-------------------------------------
love it, change it or leave it.
-------------------------------------
問候飛出去的朋友遍全球魯迪
love it, change it or leave it.
-------------------------------------
問候飛出去的朋友遍全球魯迪
Re: ESP32 ethernet, SPI, JTAG pin questions
Followup: got both tlk110 and lan8720 working. Key for me was physically routing CRS/DV to GPIO27. I'm using the onboard crystal/oscillator on the phy eval boards and haven't tried generating a clock from the ESP32.
Robin
Robin
Re: ESP32 ethernet, SPI, JTAG pin questions
Since GPIO0 is the strapping pin for booting mode, how do you handle it if it is used for RMII clock input? How do you disconnect it during reset?
Colman
Colman
Re: ESP32 ethernet, SPI, JTAG pin questions
clk disablecolman wrote:Since GPIO0 is the strapping pin for booting mode, how do you handle it if it is used for RMII clock input? How do you disconnect it during reset?
Colman
-------------------------------------
love it, change it or leave it.
-------------------------------------
問候飛出去的朋友遍全球魯迪
love it, change it or leave it.
-------------------------------------
問候飛出去的朋友遍全球魯迪
Re: ESP32 ethernet, SPI, JTAG pin questions
I am using LAN8720, it always output the 50MHz RMII clock even though it is being reset, there is no clock enable/disable option via software programming.
Colman
Colman
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