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Forum Post: RE: U0CSR.TX_BYTE won't clear

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Hi Michael,

From your previous post:
[quote user="Michael Toolin"]  // Device hardware initialization can be added here or in main() (Zmain.c).
   // Configure the GPIO and ports correctly  Begin Mike_T
  P0_4 = 1;
  P2_0 = 1;     // Set both CS high
  PERCFG &= ~0x01;     // PeRCFG.U0CFG = 0 - Set Alt 1 location for SPI interface pg 78 swru191
  P0SEL |= 0x2C;      // pins set to peripheral function, not GPIO ,pg 78
  P0SEL &= ~0x10;     // Clear bit 4, enable GPIO function
  P2DIR |= 0x01;      // Set GPIO as output for A2D
  P0DIR |= 0x10;      // Set GPIO as output for ROM[/quote] 

You have to configure chip select for A2D and ROM before assigning these

pins a value, means first configure PxSEL PxDIR, then set  P0_4 = 1; and P2_0 = 1;

I'm very busy these days at the office, so I have no much time to entirely review your code.

Meanwhile try to debug with the right setting. Update this post, or write me a private message

if you have any question/progress 


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