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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/spi.c
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@@ -1,6 +1,6 @@
// SPI support on lpc176x
//
// 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.
@@ -58,7 +58,7 @@ spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
// Setup clock rate and mode
struct spi_config res = {spi_bus[bus].spi, 0, 0};
uint32_t pclk = SystemCoreClock;
uint32_t pclk = get_pclock_frequency(spi_bus[bus].pclk);
uint32_t div = DIV_ROUND_UP(pclk/2, rate) << 1;
res.cpsr = div < 2 ? 2 : (div > 254 ? 254 : div);
res.cr0 = 0x07 | ((mode & 2) << 5) | ((mode & 1) << 7);