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atsamd: Add support for programming SERCOM pins

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Signed-off-by: Florian Heilmann <Florian.Heilmann@gmx.net>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-02-19 00:32:37 -05:00
parent 8617cbcb76
commit c8d7e28a35
10 changed files with 500 additions and 41 deletions
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34
src/atsamd/i2c.c
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@@ -1,5 +1,6 @@
// i2c support on samd
//
// Copyright (C) 2019 Florian Heilmann <Florian.Heilmann@gmx.net>
// Copyright (C) 2018-2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@@ -13,22 +14,14 @@
#define I2C_FREQ 100000
static void
i2c_init(void)
i2c_init(uint32_t bus, SercomI2cm *si)
{
static int have_run_init;
if (have_run_init)
static int have_run_init[8];
if (have_run_init[bus])
return;
have_run_init = 1;
// Setup clock
enable_pclock(SERCOM3_GCLK_ID_CORE, ID_SERCOM3);
// Configure SDA, SCL pins
gpio_peripheral(GPIO('A', 22), 'C', 0);
gpio_peripheral(GPIO('A', 23), 'C', 0);
have_run_init[bus] = 1;
// Configure i2c
SercomI2cm *si = &SERCOM3->I2CM;
si->CTRLA.reg = 0;
uint32_t areg = (SERCOM_I2CM_CTRLA_LOWTOUTEN
| SERCOM_I2CM_CTRLA_INACTOUT(3)
@@ -36,7 +29,7 @@ i2c_init(void)
| SERCOM_I2CM_STATUS_MEXTTOUT
| SERCOM_I2CM_CTRLA_MODE(5));
si->CTRLA.reg = areg;
uint32_t freq = get_pclock_frequency(SERCOM3_GCLK_ID_CORE);
uint32_t freq = sercom_get_pclock_frequency(bus);
uint32_t baud = (freq/I2C_FREQ - 10 - freq*TIME_RISE/1000000000) / 2;
si->BAUD.reg = baud;
si->CTRLA.reg = areg | SERCOM_I2CM_CTRLA_ENABLE;
@@ -52,10 +45,17 @@ i2c_init(void)
struct i2c_config
i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr)
{
if (bus)
#ifdef SERCOM7
if (bus > 7)
#else
if (bus > 5)
#endif
shutdown("Unsupported i2c bus");
i2c_init();
return (struct i2c_config){ .addr=addr<<1 };
Sercom *sercom = sercom_enable_pclock(bus);
sercom_i2c_pins(bus);
SercomI2cm *si = &sercom->I2CM;
i2c_init(bus, si);
return (struct i2c_config){ .si=si, .addr=addr<<1 };
}
static void
@@ -97,7 +97,7 @@ i2c_stop(SercomI2cm *si)
void
i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write)
{
SercomI2cm *si = &SERCOM3->I2CM;
SercomI2cm *si = (SercomI2cm *)config.si;
i2c_start(si, config.addr);
while (write_len--)
i2c_send_byte(si, *write++);