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io_mcp.c
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io_mcp.c
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#include "io_mcp.h"
#include "io_config.h"
#include "i2c.h"
#include "util.h"
#include <user_interface.h>
#include <stdlib.h>
typedef struct
{
uint32_t counter;
uint32_t debounce;
} mcp_data_pin_t;
enum
{
_IODIR = 0x00,
_IPOL = 0x02,
_GPINTEN = 0x04,
_DEFVAL = 0x06,
_INTCON = 0x08,
_IOCON = 0x0a,
_GPPU = 0x0c,
_INTF = 0x0e,
_INTCAP = 0x10,
_GPIO = 0x12,
_OLAT = 0x14,
};
#define IODIR(s) (_IODIR + s)
#define IPOL(s) (_IPOL + s)
#define GPINTEN(s) (_GPINTEN + s)
#define DEFVAL(s) (_DEFVAL + s)
#define INTCON(s) (_INTCON + s)
#define IOCON(s) (_IOCON + s)
#define GPPU(s) (_GPPU + s)
#define INTF(s) (_INTF + s)
#define INTCAP(s) (_INTCAP + s)
#define GPIO(s) (_GPIO + s)
#define OLAT(s) (_OLAT + s)
static uint8_t pin_output_cache[2];
static mcp_data_pin_t mcp_data_pin_table[io_mcp_instance_size][16];
irom static io_error_t read_register(string_t *error_message, int address, int reg, int *value)
{
uint8_t i2cbuffer[2];
i2c_error_t error;
i2cbuffer[0] = reg;
if((error = i2c_send(address, 1, &i2cbuffer[0])) != i2c_error_ok)
{
if(error_message)
i2c_error_format_string(error_message, error);
return(io_error);
}
if((error = i2c_receive(address, 1, &i2cbuffer[1])) != i2c_error_ok)
{
if(error_message)
i2c_error_format_string(error_message, error);
return(io_error);
}
*value = i2cbuffer[1];
return(io_ok);
}
irom static io_error_t write_register(string_t *error_message, int address, int reg, int value)
{
uint8_t i2cbuffer[2];
i2c_error_t error;
i2cbuffer[0] = reg;
i2cbuffer[1] = value;
if((error = i2c_send(address, 2, &i2cbuffer[0])) != i2c_error_ok)
{
if(error_message)
i2c_error_format_string(error_message, error);
return(io_error);
}
return(io_ok);
}
irom static io_error_t clear_set_register(string_t *error_message, int address, int reg, int clearmask, int setmask)
{
uint8_t i2cbuffer[2];
i2c_error_t error;
i2cbuffer[0] = reg;
if((error = i2c_send(address, 1, &i2cbuffer[0])) != i2c_error_ok)
{
if(error_message)
i2c_error_format_string(error_message, error);
return(io_error);
}
if((error = i2c_receive(address, 1, &i2cbuffer[1])) != i2c_error_ok)
{
if(error_message)
i2c_error_format_string(error_message, error);
return(io_error);
}
i2cbuffer[1] &= ~clearmask;
i2cbuffer[1] |= setmask;
if((error = i2c_send(address, 2, &i2cbuffer[0])) != i2c_error_ok)
{
if(error_message)
i2c_error_format_string(error_message, error);
return(io_error);
}
return(io_ok);
}
irom io_error_t io_mcp_init(const struct io_info_entry_T *info)
{
int ix;
int instance, pin;
uint8_t i2cbuffer[0x16];
mcp_data_pin_t *mcp_pin_data;
if(i2c_send_1(info->address, IODIR(0)) != i2c_error_ok)
return(io_error);
if(i2c_receive(info->address, sizeof(i2cbuffer), i2cbuffer) != i2c_error_ok)
return(io_error);
for(ix = DEFVAL(0); ix < 0x0b; ix++)
if(i2cbuffer[ix] != 0x00)
return(io_error);
for(ix = 0x0e; ix < 0x0f; ix++)
if(i2cbuffer[ix] != 0x00)
return(io_error);
for(instance = 0; instance < io_mcp_instance_size; instance++)
{
for(pin = 0; pin < 16; pin++)
{
mcp_pin_data = &mcp_data_pin_table[instance][pin];
mcp_pin_data->counter = 0;
mcp_pin_data->debounce = 0;
}
}
pin_output_cache[0] = 0;
pin_output_cache[1] = 0;
return(io_ok);
}
irom void io_mcp_periodic(int io, const struct io_info_entry_T *info, io_data_entry_t *data, io_flags_t *flags)
{
int pin;
int intf[2], intcap[2];
int bank, bankpin;
mcp_data_pin_t *mcp_pin_data;
io_config_pin_entry_t *pin_config;
read_register((string_t *)0, info->address, INTF(0), &intf[0]);
read_register((string_t *)0, info->address, INTF(1), &intf[1]);
read_register((string_t *)0, info->address, INTCAP(0), &intcap[0]);
read_register((string_t *)0, info->address, INTCAP(1), &intcap[1]);
for(pin = 0; pin < 16; pin++)
{
bank = (pin & 0x08) >> 3;
bankpin = pin & 0x07;
mcp_pin_data = &mcp_data_pin_table[info->instance][pin];
pin_config = &config.io_config[io][pin];
if(pin_config->llmode == io_pin_ll_counter)
{
if(mcp_pin_data->debounce != 0)
{
if(mcp_pin_data->debounce >= 10)
mcp_pin_data->debounce -= 10; // 10 ms per tick
else
mcp_pin_data->debounce = 0;
}
else
{
if((intf[bank] & (1 << bankpin)) && !(intcap[bank] & (1 << bankpin))) // only count downward edge, counter is mostly pull-up
{
mcp_pin_data->counter++;
mcp_pin_data->debounce = pin_config->speed;
flags->counter_triggered = 1;
}
}
}
}
}
irom io_error_t io_mcp_init_pin_mode(string_t *error_message, const struct io_info_entry_T *info, io_data_pin_entry_t *pin_data, const io_config_pin_entry_t *pin_config, int pin)
{
int bank, bankpin;
bank = (pin & 0x08) >> 3;
bankpin = pin & 0x07;
if(clear_set_register(error_message, info->address, IPOL(bank), 1 << bankpin, 0) != io_ok) // polarity inversion = 0
return(io_error);
if(clear_set_register(error_message, info->address, GPINTEN(bank), 1 << bankpin, 0) != io_ok) // pc int enable = 0
return(io_error);
if(clear_set_register(error_message, info->address, DEFVAL(bank), 1 << bankpin, 0) != io_ok) // compare value = 0
return(io_error);
if(clear_set_register(error_message, info->address, INTCON(bank), 1 << bankpin, 0) != io_ok) // compare source = 0
return(io_error);
if(clear_set_register(error_message, info->address, GPPU(bank), 1 << bankpin, 0) != io_ok) // pullup = 0
return(io_error);
if(clear_set_register(error_message, info->address, GPIO(bank), 1 << bankpin, 0) != io_ok) // gpio = 0
return(io_error);
if(clear_set_register(error_message, info->address, OLAT(bank), 1 << bankpin, 0) != io_ok) // latch = 0
return(io_error);
switch(pin_config->llmode)
{
case(io_pin_ll_disabled):
{
break;
}
case(io_pin_ll_input_digital):
case(io_pin_ll_counter):
{
if(clear_set_register(error_message, info->address, IODIR(bank), 0, 1 << bankpin) != io_ok) // direction = 1
return(io_error);
if(pin_config->flags.pullup && (clear_set_register(error_message, info->address, GPPU(bank), 0, 1 << bankpin) != io_ok))
return(io_error);
if((pin_config->llmode == io_pin_ll_counter) && (clear_set_register(error_message, info->address, GPINTEN(bank), 0, 1 << bankpin) != io_ok)) // pc int enable = 1
return(io_error);
break;
}
case(io_pin_ll_output_digital):
{
if(clear_set_register(error_message, info->address, IODIR(bank), 1 << bankpin, 0) != io_ok) // direction = 0
return(io_error);
break;
}
default:
{
if(error_message)
string_cat(error_message, "invalid mode for this pin\n");
return(io_error);
}
}
return(io_ok);
}
irom io_error_t io_mcp_get_pin_info(string_t *dst, const struct io_info_entry_T *info, io_data_pin_entry_t *pin_data, const io_config_pin_entry_t *pin_config, int pin)
{
int bank, bankpin, tv;
int io, olat, cached;
mcp_data_pin_t *mcp_pin_data;
bank = (pin & 0x08) >> 3;
bankpin = pin & 0x07;
mcp_pin_data = &mcp_data_pin_table[info->instance][pin];
switch(pin_config->llmode)
{
case(io_pin_ll_input_analog):
{
if(read_register(dst, info->address, GPIO(bank), &tv) != io_ok)
return(io_error);
string_format(dst, "current io: %s", onoff(tv & (1 << bankpin)));
break;
}
case(io_pin_ll_counter):
{
if(read_register(dst, info->address, GPIO(bank), &tv) != io_ok)
return(io_error);
string_format(dst, "current io: %s, debounce: %d", onoff(tv & (1 << bankpin)), mcp_pin_data->debounce);
break;
}
case(io_pin_ll_output_digital):
{
if(read_register(dst, info->address, GPIO(bank), &tv) != io_ok)
return(io_error);
io = tv & (1 << bankpin);
if(read_register(dst, info->address, OLAT(bank), &tv) != io_ok)
return(io_error);
olat = tv & (1 << bankpin);
cached = pin_output_cache[bank] & (1 << bankpin);
string_format(dst, "current latch: %s, io: %s, cache: %s", onoff(io), onoff(olat), onoff(cached));
break;
}
default:
{
}
}
return(io_ok);
}
irom io_error_t io_mcp_read_pin(string_t *error_message, const struct io_info_entry_T *info, io_data_pin_entry_t *pin_data, const io_config_pin_entry_t *pin_config, int pin, int *value)
{
int bank, bankpin, tv;
mcp_data_pin_t *mcp_pin_data;
bank = (pin & 0x08) >> 3;
bankpin = pin & 0x07;
mcp_pin_data = &mcp_data_pin_table[info->instance][pin];
switch(pin_config->llmode)
{
case(io_pin_ll_input_digital):
case(io_pin_ll_output_digital):
{
if(read_register(error_message, info->address, GPIO(bank), &tv) != io_ok)
return(io_error);
*value = !!(tv & (1 << bankpin));
break;
}
case(io_pin_ll_counter):
{
*value = mcp_pin_data->counter;
break;
}
default:
{
if(error_message)
string_cat(error_message, "invalid mode for this pin\n");
return(io_error);
}
}
return(io_ok);
}
irom io_error_t io_mcp_write_pin(string_t *error_message, const struct io_info_entry_T *info, io_data_pin_entry_t *pin_data, const io_config_pin_entry_t *pin_config, int pin, int value)
{
int bank, bankpin;
mcp_data_pin_t *mcp_pin_data;
bank = (pin & 0x08) >> 3;
bankpin = pin & 0x07;
mcp_pin_data = &mcp_data_pin_table[info->instance][pin];
if(value)
pin_output_cache[bank] |= 1 << bankpin;
else
pin_output_cache[bank] &= ~(1 << bankpin);
switch(pin_config->llmode)
{
case(io_pin_ll_output_digital):
{
if(write_register(error_message, info->address, GPIO(bank), pin_output_cache[bank]) != io_ok)
return(io_error);
break;
}
case(io_pin_ll_counter):
{
mcp_pin_data->counter = value;
break;
}
default:
{
if(error_message)
string_cat(error_message, "invalid mode for this pin\n");
return(io_error);
}
}
return(io_ok);
}