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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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43
src/atsamd/spi.c
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@@ -1,5 +1,6 @@
// spi 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.
@@ -9,24 +10,14 @@
#include "gpio.h" // spi_setup
#include "sched.h" // sched_shutdown
static void
spi_init(uint32_t ctrla, uint32_t baud)
void
spi_init(uint32_t bus, SercomSpi *ss, uint32_t ctrla, uint32_t baud)
{
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;
have_run_init[bus] = 1;
// Setup clock
enable_pclock(SERCOM4_GCLK_ID_CORE, ID_SERCOM4);
// Configure MISO, MOSI, SCK pins
gpio_peripheral(GPIO('A', 12), 'D', 0);
gpio_peripheral(GPIO('B', 10), 'D', 0);
gpio_peripheral(GPIO('B', 11), 'D', 0);
// Configure spi
SercomSpi *ss = &SERCOM4->SPI;
ss->CTRLA.reg = 0;
ss->CTRLA.reg = ctrla & ~SERCOM_SPI_CTRLA_ENABLE;
ss->CTRLB.reg = SERCOM_SPI_CTRLB_RXEN;
@@ -37,24 +28,30 @@ spi_init(uint32_t ctrla, uint32_t baud)
struct spi_config
spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
{
if (bus)
#ifdef SERCOM7
if (bus > 7)
#else
if (bus > 5)
#endif
shutdown("Invalid spi bus");
uint32_t dipo_dopo = sercom_spi_pins(bus);
uint32_t ctrla = (SERCOM_SPI_CTRLA_MODE(3)
| (mode << SERCOM_SPI_CTRLA_CPHA_Pos)
| SERCOM_SPI_CTRLA_DIPO(0)
| SERCOM_SPI_CTRLA_DOPO(1)
| dipo_dopo
| SERCOM_SPI_CTRLA_ENABLE);
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 };
Sercom *sercom = sercom_enable_pclock(bus);
SercomSpi *ss = &sercom->SPI;
uint32_t baud = sercom_get_pclock_frequency(bus) / (2 * rate) - 1;
spi_init(bus, ss, ctrla, baud);
return (struct spi_config){ .ss = ss, .ctrla = ctrla, .baud = baud };
}
void
spi_prepare(struct spi_config config)
{
uint32_t ctrla = config.ctrla, baud = config.baud;
SercomSpi *ss = &SERCOM4->SPI;
SercomSpi *ss = (SercomSpi *)config.ss;
if (ctrla == ss->CTRLA.reg && baud == ss->BAUD.reg)
return;
ss->CTRLA.reg = ctrla & ~SERCOM_SPI_CTRLA_ENABLE;
@@ -67,7 +64,7 @@ void
spi_transfer(struct spi_config config, uint8_t receive_data
, uint8_t len, uint8_t *data)
{
SercomSpi *ss = &SERCOM4->SPI;
SercomSpi *ss = (SercomSpi *)config.ss;
if (receive_data) {
while (len--) {
ss->DATA.reg = *data;