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cc2538: Allow for configuration of processor speed

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This commit is contained in:
Ulf Knoblich 2015-05-12 14:06:40 +02:00
parent 730bda2001
commit d8efa8428c
7 changed files with 107 additions and 38 deletions
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12
cpu/cc2538/dev/i2c.c
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@ -43,15 +43,7 @@
#include <stdint.h>
#include "clock.h"
/*---------------------------------------------------------------------------*/
/* Additional functions */
static uint32_t
get_sys_clock(void)
{
/* Get the clock status diviser */
return SYS_CTRL_32MHZ /
(1 << (REG(SYS_CTRL_CLOCK_STA) & SYS_CTRL_CLOCK_STA_SYS_DIV));
}
#include "sys-ctrl.h"
/*---------------------------------------------------------------------------*/
void
i2c_init(uint8_t port_sda, uint8_t pin_sda, uint8_t port_scl, uint8_t pin_scl,
@ -111,7 +103,7 @@ void
i2c_set_frequency(uint32_t freq)
{
/* Peripheral clock setting, using the system clock */
REG(I2CM_TPR) = ((get_sys_clock() + (2 * 10 * freq) - 1) /
REG(I2CM_TPR) = ((SYS_CTRL_SYS_CLOCK + (2 * 10 * freq) - 1) /
(2 * 10 * freq)) - 1;
}
/*---------------------------------------------------------------------------*/