h3n3/klipper
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

atsamd: Add a get_pclock_frequency() helper function

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

5
src/atsamd/i2c.c
View File

@@ -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" // i2c_setup
@@ -38,8 +37,8 @@ i2c_init(void)
| SERCOM_I2CM_STATUS_MEXTTOUT
| SERCOM_I2CM_CTRLA_MODE_I2C_MASTER);
si->CTRLA.reg = areg;
uint32_t baud = (CONFIG_CLOCK_FREQ / I2C_FREQ
- 10 - CONFIG_CLOCK_FREQ*TIME_RISE/1000000000) / 2;
uint32_t freq = get_pclock_frequency(SERCOM3_GCLK_ID_CORE);
uint32_t baud = (freq/I2C_FREQ - 10 - freq*TIME_RISE/1000000000) / 2;
si->BAUD.reg = baud;
si->CTRLA.reg = areg | SERCOM_I2CM_CTRLA_ENABLE;
while (si->SYNCBUSY.reg & SERCOM_I2CM_SYNCBUSY_ENABLE)