diff options
Diffstat (limited to 'src/linux/spidev.c')
| -rw-r--r-- | src/linux/spidev.c | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/src/linux/spidev.c b/src/linux/spidev.c index d68f9861..cb511205 100644 --- a/src/linux/spidev.c +++ b/src/linux/spidev.c @@ -1,6 +1,6 @@ -// Communicating with an SPI device via linux spidev +// Very basic shift-register support via a Linux SPI device // -// Copyright (C) 2017 Kevin O'Connor <kevin@koconnor.net> +// Copyright (C) 2017-2018 Kevin O'Connor <kevin@koconnor.net> // // This file may be distributed under the terms of the GNU GPLv3 license. @@ -8,6 +8,7 @@ #include <stdio.h> // snprintf #include <unistd.h> // write #include "command.h" // DECL_COMMAND +#include "gpio.h" // spi_setup #include "internal.h" // report_errno #include "sched.h" // shutdown @@ -47,22 +48,33 @@ spi_open(uint32_t bus, uint32_t dev) return fd; } -static void -spi_write(int fd, char *data, int len) +struct spi_config +spi_setup(uint32_t bus, uint8_t mode, uint32_t rate) { - int ret = write(fd, data, len); + int bus_id = (bus >> 8) & 0xff, dev_id = bus & 0xff; + int fd = spi_open(bus_id, dev_id); + return (struct spi_config) { fd }; +} + +void +spi_transfer(struct spi_config config, uint8_t receive_data + , uint8_t len, uint8_t *data) +{ + int ret = write(config.fd, data, len); if (ret < 0) { report_errno("write spi", ret); shutdown("Unable to write to spi"); } } +// Dummy versions of gpio_out functions +struct gpio_out +gpio_out_setup(uint8_t pin, uint8_t val) +{ + shutdown("gpio_out_setup not supported"); +} + void -command_send_spi(uint32_t *args) +gpio_out_write(struct gpio_out g, uint8_t val) { - int fd = spi_open(args[0], args[1]); - uint8_t len = args[2]; - char *msg = (void*)(size_t)args[3]; - spi_write(fd, msg, len); } -DECL_COMMAND(command_send_spi, "send_spi bus=%u dev=%u msg=%*s"); |