Parallel bus emulation sample code

Diff: hardware_abs.h

Revision:

0:d6ec2b9171cb

Child:

1:5526d3e04b7a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hardware_abs.h	Wed Jul 11 09:37:35 2012 +0000
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+/** A sample code for "mini board PCU9669/PCA9665"
+ *
+ *  @author  Akifumi (Tedd) OKANO, NXP Semiconductors
+ *  @version 1.0
+ *  @date    26-Mar-2012
+ *
+ *  Released under the MIT License: http://mbed.org/license/mit
+ *
+ *  An operation sample of PCU9669/PCA9665 I2C bus controller.
+ *  The mbed accesses the bus controller's parallel port (8/2 bit address and 8 bit data) by bit-banging.
+ *  The bit-banging is poerformed by PortInOut function of mbed library.
+ *
+ *    To make the code porting easier, all codes are partitioned into layers to abstract other parts.
+ *    The mbed specific parts are concentrated in lowest layer: "hardware_abs.*".
+ *    This module may need to be modified for the porting.
+ *
+ *    All other upper layers are writen in standard-C.
+ *
+ *    base code is written from 05-Sep-2011 to 09-Sep-2011.
+ *    And demo code has been build on 11-Sep-2011.
+ *    Debug and code adjustment has been done on 08-Sep-2011.
+ *    Small sanitization for main.cpp. All mbed related codes are moved in to "hardware_abs.*". 13-Oct-2011
+ *    hardware_abs are moved into parallel_bus library folder, 3 LED driver operation sample 13-Feb.-2012
+ *    PCU9669 and PCA9665 codes are packed in a project 14-Feb-2012. 
+ *    
+ *    Before builidng the code, please edit the file mini_board_PCU9669/config.h
+ *    Un-comment the target name what you want to target. 
+ */
+
+/** Hardware abstraction layer module
+ *
+ *  All MCU hardware related code are defined in this module
+ *  This module may need to be modified when the code is ported to other MCU. 
+ */
+
+#ifndef MINIBOARD_HARDWARE_ABS__
+#define MINIBOARD_HARDWARE_ABS__
+
+/** @def BURST_DATA_ACCESS
+ *
+ *  To accelerate multiple bus access on same addess, use BURST_DATA_ACCESS
+ *  On the mbed emvironment, this burst access enables 3 times faster read/write compare to single access.
+ *  For code porting, the BURST_DATA_ACCESS code part is not neccesary if the hardware is fast enough. 
+ */
+#define     BURST_DATA_ACCESS
+
+
+/** @def ASSERT / DEASSERT
+ *
+ *  Reset signal logic difinition 
+ */
+#define     ASSERT      0   //  for hardware reset
+#define     DEASSERT    1   //  for hardware reset
+
+
+/** Install an ISR
+ *
+ *  Registering function as ISR. 
+ *  The function will be called when the interrupt asserted.
+ *
+ *  @param fptr a pointer to a function
+ */
+void    install_ISR( void (*fptr)(void) );
+
+/** Hardware initialization
+ *
+ *  MCU side initialization should be done in this function. 
+ *  For the mbed, it set the initial state of parallel bus control signal. 
+ */
+void    hardware_initialize( void );
+
+/** Reset signal control
+ *
+ *  This function drives the RESET signal line with given state.  
+ *
+ *  @param signal the state of RESET signal: ASSERT | DEASSERT
+ */
+void    hardware_reset( char signal );
+
+/** Hardware reset
+ *
+ *  Asserts the RESET signal with required pulse width and waits its recovery time
+ *  
+ *  @param reset_pulse_width_us RESET pulse width in micro-seconds
+ *  @param reset_recovery_us RESET  recovery time in micro-seconds (wait time after RESET de-assertion)
+ */
+void reset( int reset_pulse_width_us, int reset_recovery_us );
+
+/** Triger signal control
+ *
+ *  This function drives the TRIGGER signal line with given state.  
+ *
+ *  @param signal the state of TRIGGER signal: ASSERT | DEASSERT
+ */
+void    hardware_trigger( char signal );
+
+/** Write data
+ *
+ *  Writes 1 byte  
+ *
+ *  @param addr 8 bit address where the data should be written to 
+ *  @param data 8 bit data which will be written
+ *  @see read_data()
+ */
+void    write_data( char addr, char data );
+
+/** Read data
+ *
+ *  Reads 1 byte  
+ *
+ *  @return 8 bit data which is read from bus
+ *  @param addr 8 bit address where the data should be read from 
+ *  @see write_data()
+ */
+char    read_data( char addr );
+
+/** Wait micro-seconds
+ *
+ *  Wait function waits given-micro-seconds
+ *
+ *  @param micro-seconds the program should wait (32 bit integer value)
+ *  @see wait_sec()
+ */
+void    hw_wait_us( int v );
+
+/** Wait seconds
+ *
+ *  Wait function waits given-seconds
+ *
+ *  @param seconds the program should wait (float value)
+ *  @see hw_wait_us()
+ */
+void    wait_sec( float );
+
+
+/** BURST_DATA_ACCESS option code
+ *
+ *  This code is option to accelerate the bus access
+ */
+#ifdef  BURST_DATA_ACCESS
+
+/** Write data
+ *
+ *  Writes multiple bytes to same address. 
+ *  This function suitable to use for the registers like SLATABLE, TRANCONFIG and data buffers (through DATA register).
+ *  While this access is going, the interrupt will be tempolary disabled (ISR execution will be postponed)
+ *
+ *  @param addr   8 bit address where the data should be written to 
+ *  @param *data  pointer to char array. The data in this array will be written
+ *  @param length length of the data (bytes)
+ *  @see read_data_burst()
+ */
+void    write_data_burst( char addr, char *data, char length );
+
+/** Read data
+ *
+ *  Reads multiple bytes from same address. 
+ *  This function suitable to use for the registers like SLATABLE, TRANCONFIG and data buffers (through DATA register).
+ *  While this access is going, the interrupt will be tempolary disabled (ISR execution will be postponed)
+ *
+ *  @param addr   8 bit address where the data should be written to 
+ *  @param *data  pointer to char array. The read data will be written to this
+ *  @param length length of the data (bytes)
+ *  @see write_data_burst()
+ */
+void    read_data_burst( char addr, char *data, char length );
+#endif
+
+#endif  //   MINIBOARD_HARDWARE_ABS__
+