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| author | Kevin O'Connor <kevin@koconnor.net> | 2021-03-24 19:49:08 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2021-03-25 11:35:04 -0400 |
| commit | ae89a65956f95c2bee652396286d97b47ff804b6 (patch) | |
| tree | 196d9447cfacccecb7766bcfd922dd205c84dc81 | |
| parent | 6cab7bcfcb12003a538435f351a73978f5fbb954 (diff) | |
| download | kutter-ae89a65956f95c2bee652396286d97b47ff804b6.tar.gz kutter-ae89a65956f95c2bee652396286d97b47ff804b6.tar.xz kutter-ae89a65956f95c2bee652396286d97b47ff804b6.zip | |
lpc176x: Do not modify PCLKSELx at runtime
The lpc176x has an errata that could cause updates to PCLKSELx to not
take effect. Rework the code to use the default peripheral clock
speed (25Mhz or 30Mhz) so that this register does not need to be
updated at runtime.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
| -rw-r--r-- | src/lpc176x/main.c | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/src/lpc176x/main.c b/src/lpc176x/main.c index b35e31ee..d12bcd57 100644 --- a/src/lpc176x/main.c +++ b/src/lpc176x/main.c @@ -49,20 +49,13 @@ void enable_pclock(uint32_t pclk) { LPC_SC->PCONP |= 1<<pclk; - if (pclk < 16) { - uint32_t shift = pclk * 2; - LPC_SC->PCLKSEL0 = (LPC_SC->PCLKSEL0 & ~(0x3<<shift)) | (0x1<<shift); - } else { - uint32_t shift = (pclk - 16) * 2; - LPC_SC->PCLKSEL1 = (LPC_SC->PCLKSEL1 & ~(0x3<<shift)) | (0x1<<shift); - } } // Return the frequency of the given peripheral clock uint32_t get_pclock_frequency(uint32_t pclk) { - return CONFIG_CLOCK_FREQ; + return CONFIG_CLOCK_FREQ / 4; } // Main entry point - called from armcm_boot.c:ResetHandler() |