/* wiringPiFindNode
*
* Parameters:
* - pin: int
* Return Type: struct wiringPiNodeStruct *
*/
mrb_value
mrb_Pi_wiringPiFindNode(mrb_state* mrb, mrb_value self) {
mrb_int native_pin;
/* Fetch the args */
mrb_get_args(mrb, "i", &native_pin);
/* Invocation */
struct wiringPiNodeStruct * result = wiringPiFindNode(native_pin);
/* Box the return value */
mrb_value return_value = (result == NULL ? mrb_nil_value() : mruby_box_wiringPiNodeStruct(mrb, result));
return return_value;
}
int init_zyncoder() {
int i,j;
for (i=0;i<MAX_NUM_ZYNSWITCHES;i++) {
zynswitches[i].enabled=0;
zynswitches[i].midi_cc=0;
}
for (i=0;i<MAX_NUM_ZYNCODERS;i++) {
zyncoders[i].enabled=0;
for (j=0;j<ZYNCODER_TICKS_PER_RETENT;j++) zyncoders[i].dtus[j]=0;
}
wiringPiSetup();
#ifdef MCP23017_ENCODERS
uint8_t reg;
mcp23017Setup(MCP23017_BASE_PIN, 0x20);
// get the node cooresponding to our mcp23017 so we can do direct writes
mcp23017_node = wiringPiFindNode(MCP23017_BASE_PIN);
// setup all the pins on the banks as inputs and disable pullups on
// the zyncoder input
reg = 0xff;
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_IODIRA, reg);
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_IODIRB, reg);
// enable pullups on the unused pins (high two bits on each bank)
reg = 0xff;
//reg = 0xc0;
//reg = 0x60;
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_GPPUA, reg);
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_GPPUB, reg);
// disable polarity inversion
reg = 0;
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_IPOLA, reg);
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_IPOLB, reg);
// disable the comparison to DEFVAL register
reg = 0;
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_INTCONA, reg);
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_INTCONB, reg);
// configure the interrupt behavior for bank A
uint8_t ioconf_value = wiringPiI2CReadReg8(mcp23017_node->fd, MCP23x17_IOCON);
bitWrite(ioconf_value, 6, 0); // banks are not mirrored
bitWrite(ioconf_value, 2, 0); // interrupt pin is not floating
bitWrite(ioconf_value, 1, 1); // interrupt is signaled by high
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_IOCON, ioconf_value);
// configure the interrupt behavior for bank B
ioconf_value = wiringPiI2CReadReg8(mcp23017_node->fd, MCP23x17_IOCONB);
bitWrite(ioconf_value, 6, 0); // banks are not mirrored
bitWrite(ioconf_value, 2, 0); // interrupt pin is not floating
bitWrite(ioconf_value, 1, 1); // interrupt is signaled by high
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_IOCONB, ioconf_value);
// finally, enable the interrupt pins for banks a and b
// enable interrupts on all pins
reg = 0xff;
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_GPINTENA, reg);
wiringPiI2CWriteReg8(mcp23017_node->fd, MCP23x17_GPINTENB, reg);
// pi ISRs for the 23017
// bank A
wiringPiISR(MCP23017_INTA_PIN, INT_EDGE_RISING, mcp23017_bank_ISRs[0]);
// bank B
wiringPiISR(MCP23017_INTB_PIN, INT_EDGE_RISING, mcp23017_bank_ISRs[1]);
#ifdef DEBUG
printf("MCP23017 initialized: INTA %d, INTB %d\n",MCP23017_INTA_PIN,MCP23017_INTB_PIN);
#endif
#else
mcp23008Setup (100, 0x20);
init_poll_zynswitches();
#endif
return 1;
}
