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atsamd: Initial support for SAMD51

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-01-14 18:21:50 -05:00
parent f6ce875818
commit 8cd83b4c2d
17 changed files with 434 additions and 61 deletions
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7
src/atsamd/i2c.c
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@@ -1,13 +1,12 @@
// i2c support on samd21
// i2c support on samd
//
// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2018-2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "internal.h" // enable_pclock
#include "command.h" // shutdown
#include "gpio.h" // i2c_setup
#include "samd21.h" // SERCOM3
#include "sched.h" // sched_shutdown
#define TIME_RISE 125ULL // 125 nanoseconds
@@ -35,7 +34,7 @@ i2c_init(void)
| SERCOM_I2CM_CTRLA_INACTOUT(3)
| SERCOM_I2CM_STATUS_SEXTTOUT
| SERCOM_I2CM_STATUS_MEXTTOUT
| SERCOM_I2CM_CTRLA_MODE_I2C_MASTER);
| SERCOM_I2CM_CTRLA_MODE(5));
si->CTRLA.reg = areg;
uint32_t freq = get_pclock_frequency(SERCOM3_GCLK_ID_CORE);
uint32_t baud = (freq/I2C_FREQ - 10 - freq*TIME_RISE/1000000000) / 2;