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lpc176x: Introduce get_pclock_frequency()

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Add get_pclock_frequency() - a standard way of obtaining the
peripheral clock frequency.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-03-24 19:45:43 -04:00
parent 964e3cc456
commit 6cab7bcfcb
6 changed files with 23 additions and 12 deletions
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4
src/lpc176x/serial.c
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@@ -1,6 +1,6 @@
// lpc176x serial port
//
// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2018-2021 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@@ -61,7 +61,7 @@ serial_init(void)
// Setup baud
LPC_UART0->LCR = (1<<7); // set DLAB bit
enable_pclock(PCLK_UART0);
uint32_t pclk = SystemCoreClock;
uint32_t pclk = get_pclock_frequency(PCLK_UART0);
uint32_t div = pclk / (CONFIG_SERIAL_BAUD * 16);
LPC_UART0->DLL = div & 0xff;
LPC_UART0->DLM = (div >> 8) & 0xff;