TS-7670 DIO

This CPU uses CPU GPIO, typically there are 4 functions associated with each physical pin (I2C, PWM, SPI, DIO, etc). See the CPU manual for the complete listing and for information on how to control these DIO.

Note that most of the pins start in their "Function" mode and must be set to DIO mode to be able to be used as DIO. Be aware that doing this on a running system may have adverse effects if there are kernel drivers trying to use specific pins in their peripheral mode(s).

DIO numbers are referenced in bank_pin notation in the table below. This makes associating pins with DIO registers much simpler when looking at the manual. The example code below is also based around using the bank and pin notation.

DIO	Location	Function
0_17	N/A	RED_LED#
0_21	N/A	ETH_3.3V_EN#
0_28	N/A	GREEN_LED#
1_1	N/A	GPS_PWR_EN#
1_7	HD1_14	DC_DIO_4
1_8	HD1_9	DC_DIO_5
1_9	HD1_7	DC_DIO_6
1_13	N/A	MODBUS_24V_EN
1_15	N/A	MODBUS_3V#_EN
1_20	Push Switch	Reset
1_22	J5_7	UART1_CTS
1_23	J5_8	UART1_RTS
1_24	N/A	BLUE_LED
1_25	N/A	RS-232_EN
1_26	N/A	YEL_LED#
1_27	N/A	HOST_USB_5V_EN
2_18	HD1_10	UART3_RXD
2_19	HD1_12	UART3_TXD
3_30	N/A	CAN_EN#
1_14	N/A	MODBUS_FAULT

Example code for DIO manipulation:

#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#define DIO_Z 2
volatile unsigned int *pinctl = NULL;

/*******************************************************************************
* setdiopin: accepts a DIO register and value to place in that DIO pin.
*   Values can be 0 (low), 1 (high), or 2 (z - high impedance).
*******************************************************************************/
void setdiopin(int bank, int pin, int val)
{
	if(val == 2) {
		pinctl[((0xB00) + (0x10 * bank) + 0x8)/4] = (0x1 << pin);
	} else {
		pinctl[((0x700) + (0x10 * bank) + (0x8 / (val+1)))/4] =
		  (0x1 << pin);
		pinctl[((0xB00) + (0x10 * bank) + 0x4)/4] = (0x1 << pin);
	}	
}
/*******************************************************************************
* getdiopin: accepts a DIO pin number and returns its value.  
*******************************************************************************/
int getdiopin(int bank, int pin)
{
	return (((pinctl[((0x900) + (0x10 * bank))/4]) >> pin) & 0x1);
}

/*******************************************************************************
* Main: accept input from the command line and act accordingly.
*******************************************************************************/
int main(int argc, char **argv)
{
	int devmem = 0;
	int pin, bank, reg = 0, muxpin;
	int val;
	int returnedValue;
         
	// Check for invalid command line arguments
	if ((argc > 4) | (argc < 3)) {
		printf("Usage: %s bank pin [0|1|2]>\n", argv[0]);
		return 1;
	}
   
	// We only want to get val if there are more than 3 command line arguments
	if (argc == 3) {
		bank = strtoul(argv[1], NULL, 0);
		pin = strtoul(argv[2], NULL, 0);
		val = 0;
	}
	else {
		bank = strtoul(argv[1], NULL, 0);
		pin = strtoul(argv[2], NULL, 0);
		val = strtoul(argv[3], NULL, 0);
	}

	assert(bank >= 0 && bank < 5);
	assert(pin >= 0 && pin < 32);
	assert(val >=0 && val < 3);

	devmem = open("/dev/mem", O_RDWR|O_SYNC);
	pinctl = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, devmem, 0x80018000);

	/* We determine what muxsel reg we need, and set the right pin to DIO*/
	if(pin > 15) {
		reg = 1;
		muxpin = pin - 16;
	} else muxpin = pin; 
	pinctl[((0x100) + (0x20 * bank) + (0x10 * reg) + 0x4)/4] = (0x3 << (muxpin * 2));
	
	// Parse through the command line arguments, check for valid inputs, and exec
	if (argc == 3) {
		returnedValue = getdiopin(bank, pin);
		printf("dio_%d_%d=%d\n", bank, pin, returnedValue);
	} else if(argc == 4) {
		setdiopin(bank, pin, val);
	}
	return 0;
}