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WiringPi
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WiringPi/wiringPi/mcp23x0817.h

88 rindas
2.5 KiB
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  1. /*

  2.  * mcp23xxx:

  3.  *	Copyright (c) 2012-2013 Gordon Henderson

  4.  *

  5.  *	Header file for code using the MCP23x08 and 17 GPIO expander

  6.  *	chips.

  7.  *	This comes in 2 flavours: MCP230xx (08/17) which has an I2C

  8.  *	interface, and the MXP23Sxx (08/17) which has an SPI interface.

  9.  ***********************************************************************

  10.  * This file is part of wiringPi:

  11.  *	https://projects.drogon.net/raspberry-pi/wiringpi/

  12.  *

  13.  *    wiringPi is free software: you can redistribute it and/or modify

  14.  *    it under the terms of the GNU Lesser General Public License as

  15.  *    published by the Free Software Foundation, either version 3 of the

  16.  *    License, or (at your option) any later version.

  17.  *

  18.  *    wiringPi is distributed in the hope that it will be useful,

  19.  *    but WITHOUT ANY WARRANTY; without even the implied warranty of

  20.  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  21.  *    GNU Lesser General Public License for more details.

  22.  *

  23.  *    You should have received a copy of the GNU Lesser General Public

  24.  *    License along with wiringPi.

  25.  *    If not, see <http://www.gnu.org/licenses/>.

  26.  ***********************************************************************

  27.  */

  28. 

  29. // MCP23x08 Registers

  30. 	

  31. #define	MCP23x08_IODIR		0x00

  32. #define	MCP23x08_IPOL		0x01

  33. #define	MCP23x08_GPINTEN	0x02

  34. #define	MCP23x08_DEFVAL		0x03

  35. #define	MCP23x08_INTCON		0x04

  36. #define	MCP23x08_IOCON		0x05

  37. #define	MCP23x08_GPPU		0x06

  38. #define	MCP23x08_INTF		0x07

  39. #define	MCP23x08_INTCAP		0x08

  40. #define	MCP23x08_GPIO		0x09

  41. #define	MCP23x08_OLAT		0x0A

  42. 

  43. // MCP23x17 Registers

  44. 

  45. #define	MCP23x17_IODIRA		0x00

  46. #define	MCP23x17_IPOLA		0x02

  47. #define	MCP23x17_GPINTENA	0x04

  48. #define	MCP23x17_DEFVALA	0x06

  49. #define	MCP23x17_INTCONA	0x08

  50. #define	MCP23x17_IOCON		0x0A

  51. #define	MCP23x17_GPPUA		0x0C

  52. #define	MCP23x17_INTFA		0x0E

  53. #define	MCP23x17_INTCAPA	0x10

  54. #define	MCP23x17_GPIOA		0x12

  55. #define	MCP23x17_OLATA		0x14

  56. 

  57. #define	MCP23x17_IODIRB		0x01

  58. #define	MCP23x17_IPOLB		0x03

  59. #define	MCP23x17_GPINTENB	0x05

  60. #define	MCP23x17_DEFVALB	0x07

  61. #define	MCP23x17_INTCONB	0x09

  62. #define	MCP23x17_IOCONB		0x0B

  63. #define	MCP23x17_GPPUB		0x0D

  64. #define	MCP23x17_INTFB		0x0F

  65. #define	MCP23x17_INTCAPB	0x11

  66. #define	MCP23x17_GPIOB		0x13

  67. #define	MCP23x17_OLATB		0x15

  68. 

  69. // Bits in the IOCON register

  70. 

  71. #define	IOCON_UNUSED	0x01

  72. #define	IOCON_INTPOL	0x02

  73. #define	IOCON_ODR	0x04

  74. #define	IOCON_HAEN	0x08

  75. #define	IOCON_DISSLW	0x10

  76. #define	IOCON_SEQOP	0x20

  77. #define	IOCON_MIRROR	0x40

  78. #define	IOCON_BANK_MODE	0x80

  79. 

  80. // Default initialisation mode

  81. 

  82. #define	IOCON_INIT	(IOCON_SEQOP)

  83. 

  84. // SPI Command codes

  85. 

  86. #define	CMD_WRITE	0x40

  87. #define CMD_READ	0x41