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add new board and app for gpio testing on octsimtest board

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Change-Id: I01243044002f51b34e8dc12c1b1f565bbf1740a2
This commit is contained in:
Joachim Steiger
2019-07-26 22:13:51 +02:00
parent 298a5ba722
commit b1a81c130e
11 changed files with 687 additions and 0 deletions
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106
firmware/libboard/octsimtest/source/mcp23017.c Normal file
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#include "board.h"
#include <stdbool.h>
#include "i2c.h"
#include "mcp23017.h"
//defines from https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library/blob/master/Adafruit_MCP23017.h under BSD license
// registers
#define MCP23017_IODIRA 0x00
#define MCP23017_IPOLA 0x02
#define MCP23017_GPINTENA 0x04
#define MCP23017_DEFVALA 0x06
#define MCP23017_INTCONA 0x08
#define MCP23017_IOCONA 0x0A
#define MCP23017_GPPUA 0x0C
#define MCP23017_INTFA 0x0E
#define MCP23017_INTCAPA 0x10
#define MCP23017_GPIOA 0x12
#define MCP23017_OLATA 0x14
#define MCP23017_IODIRB 0x01
#define MCP23017_IPOLB 0x03
#define MCP23017_GPINTENB 0x05
#define MCP23017_DEFVALB 0x07
#define MCP23017_INTCONB 0x09
#define MCP23017_IOCONB 0x0B
#define MCP23017_GPPUB 0x0D
#define MCP23017_INTFB 0x0F
#define MCP23017_INTCAPB 0x11
#define MCP23017_GPIOB 0x13
#define MCP23017_OLATB 0x15
#define MCP23017_INT_ERR 255
//bool i2c_write_byte(bool send_start, bool send_stop, uint8_t byte)
//uint8_t i2c_read_byte(bool nack, bool send_stop)
//static void i2c_stop_cond(void)
int mcp23017_write_byte(uint8_t slave, uint8_t addr, uint8_t byte)
{
bool nack;
WDT_Restart(WDT);
// Write slave address
nack = i2c_write_byte(true, false, slave << 1);
if (nack)
goto out_stop;
nack = i2c_write_byte(false, false, addr);
if (nack)
goto out_stop;
nack = i2c_write_byte(false, true, byte);
if (nack)
goto out_stop;
out_stop:
i2c_stop_cond();
if (nack)
return -1;
else
return 0;
}
int mcp23017_read_byte(uint8_t slave, uint8_t addr)
{
bool nack;
WDT_Restart(WDT);
// dummy write cycle
nack = i2c_write_byte(true, false, slave << 1);
if (nack)
goto out_stop;
nack = i2c_write_byte(false, false, addr);
if (nack)
goto out_stop;
// Re-start with read
nack = i2c_write_byte(true, false, (slave << 1) | 1);
if (nack)
goto out_stop;
return i2c_read_byte(true, true);
out_stop:
i2c_stop_cond();
if (nack)
return -1;
else
return 0;
}
int mcp23017_init(uint8_t slave)
{
printf("mcp23017_init\n");
// all gpio input
if (mcp23017_write_byte(slave, MCP23017_IODIRA, 0xff))
return false;
if (mcp23017_write_byte(slave, MCP23017_IODIRB, 0xff))
return false;
printf("mcp23017 found\n");
return true;
}