FlexIO_T4 library: Removed which Teensy specific tables from the library

KurtE

KurtE

Senior Member+
For a while now, I have not liked having #ifdef tables defined in a different places in the cores or libraries to handle the differences in Arduino pins that are on each of the different boards. It made it more complicated when PJRC releases a new board and likewise if someone builds a custom board and tries to create
a variant to handle the differences.

What the code now does, is to do all of the mappings, using more or less the IMXRT Pin name instead... More specifically the
table is built up with pointers to the PinS port config register... And the tables look like:
Code: 
// FlexIO1
static const volatile uint32_t *flexio_t4_pins_flexio1[] PROGMEM = {
    &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_00, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_01, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_02, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_03,
    &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_04, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_05, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_06, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_07,
    &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_08, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_09, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_10, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_11,
    &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_26, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_27, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_28, &IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_29};

The code that converts from pin number to the FlexIO number simply does:
Code: 
if (pin >= CORE_NUM_DIGITAL)
        return 0xff; // pin is out of range.
    volatile uint32_t *pin_mux = portConfigRegister(pin);
And then looks through the table for a match to pin_mux and returns the index.

I also added a reverse mapping: when you can pass in the FlexIO pin number, and it will return the Teensy IO pin number
or 0xff if there is none...

The current code is in my branch: https://github.com/KurtE/FlexIO_t4/tree/teensy_indep
Note: I plan to merge this back into the main branch in the next week or so, unless there are some major issues uncovered.

As part of this: I added a new example sketch FlexIO_pin_list
Which prints out information about the different FlexIO objects.

Output for Micromod:

Code: 
Teensy Micromod FlexIO pin list

FlexIO1:
    Pin Order: Pin:flex
         2:4 3:5 4:6 5:8 33:7
    Flex Pin Order: flex:in
         4:2 5:3 6:4 7:33 8:5
FlexIO2:
    Pin Order: Pin:flex
         6:10 7:17 8:16 9:11 10:0 11:2 12:1 13:3 32:12 40:4 41:5 42:6 43:7 44:8 45:9
    Flex Pin Order: flex:in
         0:10 1:12 2:11 3:13 4:40 5:41 6:42 7:43 8:44 9:45 10:6 11:9 12:32 16:8 17:7
FlexIO3:
    Pin Order: Pin:flex
         7:17 8:16 14:2 15:3 16:7 17:6 18:1 19:0 20:10 21:11 22:8 23:9 26:14 27:15
    Flex Pin Order: flex:in
         0:19 1:18 2:14 3:15 6:17 7:16 8:22 9:23 10:20 11:21 14:26 15:27 16:8 17:7
Flex IO Pin ranges:
    FlexIO1: 4-8
    FlexIO2: 0-12, 16-17
    FlexIO3: 0-3, 6-11, 14-17

Bounds check test:
    FlexIO1  IOToFlex(46):255 IOToFlex(255):255 FlexToIO(16):255 FlexToIO(255):255
    FlexIO2  IOToFlex(46):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255
    FlexIO3  IOToFlex(46):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255

Teensy 4.1:
Code: 
Teensy 4.1 FlexIO pin list

FlexIO1:
    Pin Order: Pin:flex
         2:4 3:5 4:6 5:8 33:7 49:13 50:14 52:12 54:15
    Flex Pin Order: flex:in
         4:2 5:3 6:4 7:33 8:5 12:52 13:49 14:50 15:54
FlexIO2:
    Pin Order: Pin:flex
         6:10 7:17 8:16 9:11 10:0 11:2 12:1 13:3 32:12 34:29 35:28 36:18 37:19
    Flex Pin Order: flex:in
         0:10 1:12 2:11 3:13 10:6 11:9 12:32 16:8 17:7 18:36 19:37 28:35 29:34
FlexIO3:
    Pin Order: Pin:flex
         7:17 8:16 14:2 15:3 16:7 17:6 18:1 19:0 20:10 21:11 22:8 23:9 26:14 27:15 34:29 35:28 36:18 37:19 38:12 39:13 40:4 41:5
    Flex Pin Order: flex:in
         0:19 1:18 2:14 3:15 4:40 5:41 6:17 7:16 8:22 9:23 10:20 11:21 12:38 13:39 14:26 15:27 16:8 17:7 18:36 19:37 28:35 29:34
Flex IO Pin ranges:
    FlexIO1: 4-8, 12-15
    FlexIO2: 0-3, 10-12, 16-19, 28-29
    FlexIO3: 0-19, 28-29

Bounds check test:
    FlexIO1  IOToFlex(55):255 IOToFlex(255):255 FlexToIO(16):255 FlexToIO(255):255
    FlexIO2  IOToFlex(55):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255
    FlexIO3  IOToFlex(55):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255

Teensy 4:
Code: 
Teensy 4 FlexIO pin list

FlexIO1:
    Pin Order: Pin:flex
         2:4 3:5 4:6 5:8 33:7
    Flex Pin Order: flex:in
         4:2 5:3 6:4 7:33 8:5
FlexIO2:
    Pin Order: Pin:flex
         6:10 7:17 8:16 9:11 10:0 11:2 12:1 13:3 32:12
    Flex Pin Order: flex:in
         0:10 1:12 2:11 3:13 10:6 11:9 12:32 16:8 17:7
FlexIO3:
    Pin Order: Pin:flex
         7:17 8:16 14:2 15:3 16:7 17:6 18:1 19:0 20:10 21:11 22:8 23:9 26:14 27:15
    Flex Pin Order: flex:in
         0:19 1:18 2:14 3:15 6:17 7:16 8:22 9:23 10:20 11:21 14:26 15:27 16:8 17:7
Flex IO Pin ranges:
    FlexIO1: 4-8
    FlexIO2: 0-3, 10-12, 16-17
    FlexIO3: 0-3, 6-11, 14-17

Bounds check test:
    FlexIO1  IOToFlex(40):255 IOToFlex(255):255 FlexToIO(16):255 FlexToIO(255):255
    FlexIO2  IOToFlex(40):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255
    FlexIO3  IOToFlex(40):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255

And the Dev Board 4:
Code: 
Teensy Micromod FlexIO pin list

FlexIO1:
    Pin Order: Pin:flex
         2:4 3:5 4:6 5:8 33:7
    Flex Pin Order: flex:in
         4:2 5:3 6:4 7:33 8:5
FlexIO2:
    Pin Order: Pin:flex
         6:10 7:17 8:16 9:11 10:0 11:2 12:1 13:3 32:12 40:4 41:5 42:6 43:7 44:8 45:9 46:12 47:14 48:15 49:18 50:19 51:20 52:21 53:22 54:23 55:24 56:25 57:26 58:27 59:28 60:29 61:30 62:31 63:13
    Flex Pin Order: flex:in
         0:10 1:12 2:11 3:13 4:40 5:41 6:42 7:43 8:44 9:45 10:6 11:9 12:32 13:63 14:47 15:48 16:8 17:7 18:49 19:50 20:51 21:52 22:53 23:54 24:55 25:56 26:57 27:58 28:59 29:60 30:61 31:62
FlexIO3:
    Pin Order: Pin:flex
         7:17 8:16 14:2 15:3 16:7 17:6 18:1 19:0 20:10 21:11 22:8 23:9 26:14 27:15 49:18 50:19 51:20 52:21 53:22 54:23 55:24 56:25 57:26 58:27 59:28 60:29 61:30 62:31
    Flex Pin Order: flex:in
         0:19 1:18 2:14 3:15 6:17 7:16 8:22 9:23 10:20 11:21 14:26 15:27 16:8 17:7 18:49 19:50 20:51 21:52 22:53 23:54 24:55 25:56 26:57 27:58 28:59 29:60 30:61 31:62
Flex IO Pin ranges:
    FlexIO1: 4-8
    FlexIO2: 0-31
    FlexIO3: 0-3, 6-11, 14-31

Bounds check test:
    FlexIO1  IOToFlex(64):255 IOToFlex(255):255 FlexToIO(16):255 FlexToIO(255):255
    FlexIO2  IOToFlex(64):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255
    FlexIO3  IOToFlex(64):255 IOToFlex(255):255 FlexToIO(32):255 FlexToIO(255):255
 
Quick udpate: I merged it into the main branch.
Created a backup branch.

Not sure when it will be picked up in a Teensy beta and release.
No idea when those might happen.
 
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