cy22393.c

Freescale MCF5445evb 参考测试代码

/*! 
 * \file    cy22393.c
 * \brief   Cypress Clock Generator Driver
 * 
 * This driver uses the I2C bus to communicate with the Cypress CY22393. All
 * writes to the CY22393 are volatile.  A device reset will revert the clock
 * outputs to the state defined in the non-volatile memory of the CY22393.
 *
 * \author  Michael Norman
 * \version $Revision: 1.1 $
 */

#include "common.h"
#include "cy22393.h"
#include "i2c.h"

extern I2C_BUFFER i2c_tx_buffer;
extern I2C_BUFFER i2c_rx_buffer;

/********************************************************************/
void
cy22393_init(void)
{
    /* Configure GPIO pins to I2C function */
    MCF_GPIO_PAR_FECI2C |= 0
        | MCF_GPIO_PAR_FECI2C_SCL_SCL 
        | MCF_GPIO_PAR_FECI2C_SDA_SDA;

    /* Set transmission frequency 0x19 = 103.9kHz, 0x1A = 86.6kHz */
    MCF_I2C_I2FDR = 0x19;
    /* Set module's I2C address to 0x6A */
    MCF_I2C_I2AR = 0x6A;
    /* Enable I2C module */
    MCF_I2C_I2CR = 0xC0;

}
/********************************************************************/
void
cy22393_read(int addr, uint8 *buf, int bytes)
{
    int i;
    
    i2c_tx_buffer.tx_index = 0;
    i2c_tx_buffer.rx_index = 0;
    i2c_tx_buffer.data_present = TRUE;
    i2c_tx_buffer.length = 1;
    i2c_tx_buffer.buf[0] = addr; /* Starting address of Cypress clock memory */

    /* Initialize RX buffer structure */
    i2c_rx_buffer.tx_index = 0;
    i2c_rx_buffer.rx_index = 0;
    i2c_rx_buffer.data_present = FALSE;
    i2c_rx_buffer.length = bytes;

    /* Perform TX/RX using Repeated start */
    i2c_master(I2C_TXRX, CY22393_WR_ADDR);
    
    for (i = 0; i < bytes; i++)
        buf[i] = i2c_rx_buffer.buf[i];
}
/********************************************************************/
void
cy22393_write(int addr, uint8 *buf, int bytes)
{
}
/********************************************************************/
void
cy22393_dump (void)
{
    int i;
    
    i2c_tx_buffer.tx_index = 0;
    i2c_tx_buffer.rx_index = 0;
    i2c_tx_buffer.data_present = TRUE;
    i2c_tx_buffer.length = 1;
    i2c_tx_buffer.buf[0] = 0x0; /* Starting address of Cypress clock memory */

    /* Initialize RX buffer structure */
    i2c_rx_buffer.tx_index = 0;
    i2c_rx_buffer.rx_index = 0;
    i2c_rx_buffer.data_present = FALSE;
    i2c_rx_buffer.length = 88;

    /* Perform TX/RX using Repeated start */
    i2c_master(I2C_TXRX, CY22393_WR_ADDR);
    
    printf("   00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F\n");
    printf("   -----------------------------------------------");
    for ( i = 0; i < 88; i++ )
    {
        if ((i % 16) == 0)
            printf("\n%02X ", i);
        printf("%02X ", i2c_rx_buffer.buf[i]);
    }
}
/********************************************************************/
void
cy22393_disable_clk(CY22393_CLK clk)
{
    switch (clk)
    {
        case CY22393_CLKA: 
            i2c_tx_buffer.buf[0] = 0x08;
            i2c_tx_buffer.buf[1] = 0x0;
            i2c_tx_buffer.buf[2] = 0x0;
            i2c_tx_buffer.length = 3;
            break;
        case CY22393_CLKB: 
            i2c_tx_buffer.buf[0] = 0x0A;
            i2c_tx_buffer.buf[1] = 0x0;
            i2c_tx_buffer.buf[2] = 0x0;
            i2c_tx_buffer.length = 3;
            break;
        case CY22393_CLKC: 
            i2c_tx_buffer.buf[0] = 0x0C;
            i2c_tx_buffer.buf[1] = 0x0;
            i2c_tx_buffer.length = 2;
            break;
        case CY22393_CLKD: 
            i2c_tx_buffer.buf[0] = 0x0D;
            i2c_tx_buffer.buf[1] = 0x0;
            i2c_tx_buffer.length = 2;
            break;
        case CY22393_CLKE: 
            i2c_tx_buffer.buf[0] = 0x0F;
            i2c_tx_buffer.buf[1] = 0x58;
            i2c_tx_buffer.length = 2;
            break;
        default:
            break;
    }
    
    i2c_tx_buffer.tx_index = 0;
    i2c_tx_buffer.rx_index = 0;
    i2c_tx_buffer.data_present = TRUE;
    
    i2c_master(I2C_TX, CY22393_WR_ADDR);
}
/********************************************************************/