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mac-rom-simm-programmer
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Oops! the MCP23S17's DDR is backwards from the AVR. 1 = input, 0 = output. After swapping them, my electrical test is working!

This commit is contained in:
Doug Brown 2011-12-07 21:30:42 -08:00
parent b475c28040
commit 918b615654
1 changed files with 2 additions and 2 deletions
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4
mcp23s17.c
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@ -98,7 +98,7 @@ void MCP23S17_Init()
void MCP23S17_SetDDR(uint16_t ddr)
{
MCP23S17_WriteBothRegs(MCP23S17_IODIRA, ddr);
MCP23S17_WriteBothRegs(MCP23S17_IODIRA, ~ddr);
}
void MCP23S17_SetPins(uint16_t data)
@ -124,7 +124,7 @@ uint16_t MCP23S17_GetOutputs(void)
uint16_t MCP23S17_GetDDR(void)
{
return MCP23S17_ReadBothRegs(MCP23S17_IODIRA);
return ~MCP23S17_ReadBothRegs(MCP23S17_IODIRA);
}
uint16_t MCP23S17_GetPullups(void)