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gpio Makefile changed to add PREFIX & DESTDIR

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mcp3004.c bugfixed. It works now!
This commit is contained in:
Gordon Henderson
2013-07-14 12:28:12 +01:00
parent 45bfe43c1e
commit 4d43c8cdca
2 changed files with 20 additions and 15 deletions
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15
wiringPi/mcp3004.c
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@@ -2,6 +2,8 @@
* mcp3004.c:
* Extend wiringPi with the MCP3004 SPI Analog to Digital convertor
* Copyright (c) 2012-2013 Gordon Henderson
*
* Thanks also to "ShorTie" on IRC for some remote debugging help!
***********************************************************************
* This file is part of wiringPi:
* https://projects.drogon.net/raspberry-pi/wiringpi/
@@ -35,18 +37,19 @@
static int myAnalogRead (struct wiringPiNodeStruct *node, int pin)
{
unsigned char spiData [2] ;
unsigned char spiData [3] ;
unsigned char chanBits ;
int chan = pin - node->pinBase ;
chanBits = 0b11000000 | (chan << 3) ;
chanBits = 0b10000000 | (chan << 4) ;
spiData [0] = chanBits ;
spiData [1] = 0 ;
spiData [0] = 1 ; // Start bit
spiData [1] = chanBits ;
spiData [2] = 0 ;
wiringPiSPIDataRW (node->fd, spiData, 2) ;
wiringPiSPIDataRW (node->fd, spiData, 3) ;
return ((spiData [0] << 7) | (spiData [1] >> 1)) & 0x3FF ;
return ((spiData [1] << 8) | spiData [2]) & 0x3FF ;
}