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add/fix mcp23017 i2c gpio expander functions and tests

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Change-Id: Ia2e5a1bf3f97272931014e54e587109297556c03
This commit is contained in:
Joachim Steiger
2019-10-24 18:09:05 +02:00
parent 3feadfa910
commit f7f1ea864d
6 changed files with 52 additions and 9 deletions
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40
firmware/libboard/octsimtest/source/mcp23017.c
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@@ -94,13 +94,47 @@ out_stop:
int mcp23017_init(uint8_t slave)
{
printf("mcp23017_init\n");
printf("mcp23017_init\n\r");
// all gpio input
if (mcp23017_write_byte(slave, MCP23017_IODIRA, 0xff))
return false;
if (mcp23017_write_byte(slave, MCP23017_IODIRB, 0xff))
// msb of portb output, rest input
if (mcp23017_write_byte(slave, MCP23017_IODIRB, 0x7f))
return false;
printf("mcp23017 found\n");
if (mcp23017_write_byte(slave, MCP23017_IOCONA, 0x20)) //disable SEQOP (autoinc addressing)
return false;
printf("mcp23017 found\n\r");
return true;
}
int mcp23017_test(uint8_t slave)
{
printf("mcp23017_test\n\r");
printf("GPIOA 0x%x\n\r", mcp23017_read_byte(slave,MCP23017_GPIOA));
printf("GPIOB 0x%x\n\r", mcp23017_read_byte(slave,MCP23017_GPIOB));
printf("IODIRA 0x%x\n\r", mcp23017_read_byte(slave,MCP23017_IODIRA));
printf("IODIRB 0x%x\n\r", mcp23017_read_byte(slave,MCP23017_IODIRB));
printf("IOCONA 0x%x\n\r", mcp23017_read_byte(slave,MCP23017_IOCONA));
printf("IOCONB 0x%x\n\r", mcp23017_read_byte(slave,MCP23017_IOCONB));
return 0;
}
int mcp23017_toggle(uint8_t slave)
{
// example writing MSB of gpio
static bool foo=false;
if (foo)
{
printf("+\n\r");
mcp23017_write_byte(slave, MCP23017_OLATB, 0x80);
foo=false;
}
else
{
printf("-\n\r");
mcp23017_write_byte(slave, MCP23017_OLATB, 0x00);
foo=true;
}
return 0;
}