m68k i2c driver fixes

[Bart Veer]

This removes a spurious big of diagnostics code, and fixes a bug
reported quite some time ago.

Bart

2009-02-09  Bart Veer  <ba...@ecoscentric.com>

        * src/i2c_mcf52xx.c (mcf52xx_i2c_isr): handle RXAK error
        condition, reported by Rainer Arndt.

        * src/i2c_mcf52xx.c (cyg_mcf52xx_i2c_tx): remove spurious
        diag_printf(). 

Index: src/i2c_mcf52xx.c
===================================================================
RCS file: 
/cvs/ecos/ecos/packages/devs/i2c/m68k/mcf52xx/current/src/i2c_mcf52xx.c,v
retrieving revision 1.2
diff -u -p -r1.2 i2c_mcf52xx.c
--- src/i2c_mcf52xx.c   29 Jan 2009 17:48:33 -0000      1.2
+++ src/i2c_mcf52xx.c   9 Feb 2009 22:49:01 -0000
@@ -163,7 +163,7 @@ mcf52xx_i2c_isr(cyg_vector_t vec, cyg_ad
     } else if (CYG_MCF52xx_I2C_XFER_MODE_STARTRX == extra->i2c_mode) {
         // Start followed by RX. The address byte has been sent, we
         // need to switch to receiving.
-        if (sr & HAL_MCF52xx_I2C_SR_IAL) {
+        if (sr & (HAL_MCF52xx_I2C_SR_IAL | HAL_MCF52xx_I2C_SR_RXAK)) {
             // Looks like no device acknowledged the address.
             result = CYG_ISR_HANDLED | CYG_ISR_CALL_DSR;
         } else {
@@ -367,7 +367,6 @@ cyg_mcf52xx_i2c_tx(const cyg_i2c_device*
         if (send_start) {
             extra->i2c_data.i2c_tx_data = tx_data;
             if (! mcf52xx_i2c_send_start(extra, (dev->i2c_address << 1) | 
0x00)) {
-                diag_printf("send_start failed\n");
                 return 0;
             }
             mcf52xx_i2c_doit(extra);