[Ovmsdev] OVMS V2.5 production / Renault Zoe support

Mon May 1 22:30:14 HKT 2017

I’ve re-drawn it, as discussed, and sent to China for their comment.

MAX7317 ends up looking like this:

Our expansion slots like this:

and the ESP32 MCU pinout like this:

New pinout for MCU:

Pin	Type	Function	Name	Function
1	P	Ground	GND	Ground
2	P	Power supply.	3.3V	Power supply to ESP32 WROOM32
3	I	Chip-enable signal. Active high.	ESP32_EN	"EN" switch
4	I	GPIO36, SENSOR_VP, ADC_H, ADC1_CH0, RTC_GPIO0	ADC_IN	ADC in (from 12V vehicle power voltage divider)
5	I	GPIO39, SENSOR_VN, ADC1_CH3, ADC_H, RTC_GPIO3	SD_DET	SD Card DETECT
6	I	GPIO34, ADC1_CH6, RTC_GPIO4	SP_INT1	VSPI INT 1
7	I	GPIO35, ADC1_CH7, RTC_GPIO5	SP_INT2	VSPI INT 2
8	I/O	GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4, TOUCH9, RTC_GPIO9	EXP_1	Expansion GPIO 1
9	I/O	GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5, TOUCH8, RTC_GPIO8	EXP_2	Expansion GPIO 2
10	I/O	GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0	CAN_TXD	CAN, tx to transceiver
11	I/O	GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1	CAN_RXD	CAN, rx from transceiver
12	I/O	GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17, EMAC_RX_DV	SP_CS2	VSPI CS 2 (MCP2515)
13	I/O	GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK, HS2_CLK, SD_CLK, EMAC_TXD2	SD_CLK	SD Card CLK
14	I/O	GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ, HS2_DATA2, SD_DATA2, EMAC_TXD3	SD_DATA2	SD Card DATA2
15	P	Ground	GND	Ground
16	I/O	GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID, HS2_DATA3, SD_DATA3, EMAC_RX_ER	SD_DATA3	SD Card DATA3
17	I/O	GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD	FL_DATA2	SPI flash on ESP-WROOM-32
18	I/O	GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD	FL_DATA3	SPI flash on ESP-WROOM-32
19	I/O	GPIO11, SD_CMD, SPICS0, HS1_CMD, U1RTS	FL_CS1	SPI flash on ESP-WROOM-32
20	I/O	GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS	FL_CLK	SPI flash on ESP-WROOM-32
21	I/O	GPIO7, SD_DATA0, SPIQ, HS1_DATA0, U2RTS	FL_DATA0	SPI flash on ESP-WROOM-32
22	I/O	GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS	FL_DATA1	SPI flash on ESP-WROOM-32
23	I/O	GPIO15, ADC2_CH3, TOUCH3, MTDO, HSPICS0, RTC_GPIO13, HS2_CMD, SD_CMD, EMAC_RXD3	SD_CMD	SD Card CMD
24	I/O	GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0, SD_DATA0	SD_DATA0	SD Card DATA0
25	I/O	GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1, EMAC_TX_CLK	ESP32_IO0	"BOOT" switch
26	I/O	GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1, SD_DATA1, EMAC_TX_ER	SD_DATA1	SD Card DATA1
27	I/O	GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT	MDM_TXD	UART 2, TX to modem
28	I/O	GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180	MDM_RXD	UART 2, RX from modem
29	I/O	GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK	SP_CS1	VSPI CS 1 (MCP2515)
30	I/O	GPIO18, VSPICLK, HS1_DATA7	SP_CLK	VSPI CLK
31	I/O	GPIO19, VSPIQ, U0CTS, EMAC_TXD0	SP_MISO	VSPI MISO
32	-	-	n/a	No connection
33	I/O	GPIO21, VSPIHD, EMAC_TX_EN	SP_CS3	VSPI CS3 (MAX7317 I/O expander)
34	I/O	GPIO3, U0RXD, CLK_OUT2	CSL_TXD	UART 0, TX to console
35	I/O	GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2	CSL_RXD	UART 0, RX from console
36	I/O	GPIO22, VSPIWP, U0RTS, EMAC_TXD1	FL_CS2	SPI to external flash, Chip Select
37	I/O	GPIO23, VSPID, HS1_STROBE	SP_MOSI	VSPI MOSI
38	P	Ground	GND	Ground
39	P	Ground	GND	Ground

Overall, that gives us two free GPIO directly on the ESP-32 and eight free GPIO on the MAX7317 expander.

If China is OK with that, they’ll finalise the board layout next week and make a couple of development boards to ensure that all the components work as expected.

I attached the revised draft schematic (2017-05-01). This one also incorporates the change to the external flash arrangement.

Regards, Mark.

A note on displays

In general, for external displays I’m thinking that a UART/Bluetooth/SPI/CAN interface would be better suited, with some small micro-controller, rather than raw GPIO. I know raw GPIO is simple, but there is so much more that can be done with this, and the prices of displays are plummeting. I certainly intend to use bluetooth to a cellphone, and we can expose the OVMS protocol to that to allow for some pretty powerful control.

The ESP32 now has two direct GPIO pins free (EXT_1 and EXT_2) and those can be mapped to a UART, for example.

Along with some HUDs, I’ve been experimenting with a little OBDII display that costs around US$25 (quantity: 1). Connection is via OBDII (CAN bus) - the idea being that we will emulate an OBDII ECU on one of our CAN buses that connects to this. So, we can output battery temperate where the unit expects coolant temperature, SOC% as fuel level, etc. MCU in that unit is a GD32F103 (like an STM32, but 108MHz). Input is via a little jog-left, jog-right, push-to-click button on the front. Just an idea and something I’m messing around with.

> On 29 Apr 2017, at 1:07 AM, Michael Balzer <dexter at expeedo.de> wrote:
> 
> Currently the Think uses two GPIO pins, the Leaf one, and the Twizy eight (4 in + 4 out for the SimpleConsole).
> 
> This is the only SPI bus left for general purpose extensions?
> 
> But as the MAX7317 is 16 bit and supports daisy chaining, it will still be possible to add a touch screen or other I/O extensions to it?
> 
> If it doesn't create problems for "higher level" addons it's got my vote as well.
> 
> Regards,
> Michael
> 
> 
> Am 28.04.2017 um 07:02 schrieb Mark Webb-Johnson:
>> Copying OVMS developers in on this, as it is an interesting question.
>> 
>> Free pins are very tight on the OVMS v3. We’ve added so much as standard (extra flash, SD card, 3 CAN buses, etc, etc) that there is not much free.
>> 
>> In the first draft design (shown on the attached pictures), we had two general GPIO pins free - EXP_1 and EXP_2. However, working with Espressif (the makers of the ESP-32 MCU) it seems that the best and simplest way to use external flash is to change the SPI bus chip select line and add an external flash on that. If we do that, we need one more pin, and that means goodbye EXP_2.
>> 
>> So, only one free GPIO pin - EXP_1.
>> 
>> We do have two internal expansion slots where piggy-back boards can be plugged (one for the optional modem and one free for general use). These use standard 0.1” SIP connectors (two 1x10), so very easy to breadboard. For those, we have EXP_1 on the attached diagram.
>> 
>> These pins are also available on a DA26 female expansion connector on the side of the module (so you can use them directly).
>> 
>> There is also a SW_12V switched 12volt supply on the DA26 female expansion connector.
>> 
>> So, the short answer is if you just need a single GPIO, that is available either internally of externally as EXP_1. If you need a second, you could probably use the SW_12V as well.
>> 
>> I/O expansion
>> 
>> If you need more than two, then you could use a SPI bus I/O expander, probably on one of the internal expansion slots, and use EXP_1 to drive that. The MAX7317 is suitable.
>> 
>> In the first draft design for OVMS v3, we have three relatively unused simple I/O pins
>> MDM_EN - UART 2, modem enable (used to reset the modem - very infrequent)
>> SW_CTL - Switched 12V control signal (used to turn on/off the external 12V - very infrequent)
>> EXP_1 - expansion pin
>> 
>> What I’ve been considering is adding a MAX7317 as standard, using EXP_1 to drive that (along with the normal SPI bus used for two of the CAN buses), then moving MDM_EN and SW_CTL to that. The MAX7317 has 10 I/O ports, so if we did that, we’d get 8 free I/O ports from the MAX7317 as well as 2 direct off the ESP32 MCU.
>> 
>> I’m 99% decided to do that, but just trying to work out cost impact and if there is enough room on the board to actually fit it in.
>> 
>> Regards, Mark.
>> 
>> 
>> 
>> 
>> 
>> 
>>> On 28 Apr 2017, at 3:04 AM, Wolfgang Jenne <wolfi at spider.li <mailto:wolfi at spider.li>> wrote:
>>> 
>>> One question: The OVMS v3 module: is it going to have some digital inputs somehow?
>>> 
>>> thanks,
>>> Wolfgang
>> 
>> 
>> 
>> _______________________________________________
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> 
> -- 
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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