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atsamd: Add a get_pclock_frequency() helper function

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-01-18 18:52:44 -05:00
parent 8f763d80b7
commit c5fc264a07
5 changed files with 13 additions and 7 deletions
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3
src/atsamd/spi.c
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@@ -4,7 +4,6 @@
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_CLOCK_FREQ
#include "internal.h" // enable_pclock
#include "command.h" // shutdown
#include "gpio.h" // spi_setup
@@ -47,7 +46,7 @@ spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
| SERCOM_SPI_CTRLA_DIPO(0)
| SERCOM_SPI_CTRLA_DOPO(1)
| SERCOM_SPI_CTRLA_ENABLE);
uint32_t baud = CONFIG_CLOCK_FREQ / (2 * rate) - 1;
uint32_t baud = get_pclock_frequency(SERCOM4_GCLK_ID_CORE) / (2 * rate) - 1;
spi_init(ctrla, baud);
return (struct spi_config){ .ctrla = ctrla, .baud = baud };
}