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Fixes to the LM4F clock configuration. Errors in register handling caused everything to run at half speed

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This commit is contained in:
Gregory Nutt 2013-04-09 17:27:13 -06:00
parent 2bc1740a60
commit 37d4a4e99d
1 changed files with 23 additions and 3 deletions
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26
configs/lm4f120-launchpad/include/board.h
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@ -77,16 +77,36 @@
* - No auto-clock gating reset
*/
#define LM_RCC_VALUE (SYSCON_RCC_OSCSRC | SYSCON_RCC_XTAL | SYSCON_RCC_USESYSDIV | SYSCON_RCC_SYSDIV(LM_SYSDIV))
#define LM_RCC_VALUE (SYSCON_RCC_OSCSRC | SYSCON_RCC_XTAL | \
SYSCON_RCC_USESYSDIV | SYSCON_RCC_SYSDIV(LM_SYSDIV))
/* RCC2 settings -- RCC2 not used. Other RCC2 settings
/* RCC2 settings
*
* - PLL and sys dividers not bypassed.
* - PLL not powered down
* - Not using RCC2
*
* When SYSCON_RCC2_DIV400 is not selected, SYSDIV2 is the divisor-1.
* When SYSCON_RCC2_DIV400 is selected, SYSDIV2 is the divisor-1)/2, plus
* the LSB:
*
* SYSDIV2 SYSDIV2LSB DIVISOR
* 0 N/A 2
* 1 0 3
* " 1 4
* 2 0 5
* " 1 6
* etc.
*/
#define LM_RCC2_VALUE (SYSCON_RCC2_OSCSRC | SYSCON_RCC2_SYSDIV(LM_SYSDIV) | SYSCON_RCC2_DIV400)
#if (LM_SYSDIV & 1) == 0
# define LM_RCC2_VALUE (SYSCON_RCC2_OSCSRC | SYSCON_RCC2_SYSDIV2LSB | \
SYSCON_RCC2_SYSDIV_DIV400(LM_SYSDIV) | \
SYSCON_RCC2_DIV400 | SYSCON_RCC2_USERCC2)
#else
# define LM_RCC2_VALUE (SYSCON_RCC2_OSCSRC | SYSCON_RCC2_SYSDIV_DIV400(LM_SYSDIV) | \
SYSCON_RCC2_DIV400 | SYSCON_RCC2_USERCC2)
#endif
/* LED definitions ******************************************************************/
/* The LM4F120 LaunchPad has a single RGB LED. There is only one visible LED which