diff options
Diffstat (limited to 'firmware/zpu/lib/spi.h')
| -rw-r--r-- | firmware/zpu/lib/spi.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/firmware/zpu/lib/spi.h b/firmware/zpu/lib/spi.h new file mode 100644 index 000000000..125e1a502 --- /dev/null +++ b/firmware/zpu/lib/spi.h @@ -0,0 +1,49 @@ +/* + * Copyright 2012 Ettus Research LLC + * Copyright 2006,2007 Free Software Foundation, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef INCLUDED_SPI_H +#define INCLUDED_SPI_H + +#include <stdbool.h> +#include <stdint.h> + +/*! + * \brief One time call to initialize SPI + */ +void spi_init(void); + +/*! + * \brief Wait for last SPI transaction to complete. + * Unless you need to know it completed, it's not necessary to call this. + */ +void spi_wait(void); + +#define SPI_TXONLY false // readback: no +#define SPI_TXRX true // readback: yes + +/* + * Flags for spi_transact + */ +#define SPI_PUSH_RISE (1 << 0) // push tx data on rising edge of SCLK +#define SPI_PUSH_FALL (1 << 1) // push tx data on falling edge of SCLK +#define SPI_LATCH_RISE (1 << 2) // latch rx data on rising edge of SCLK +#define SPI_LATCH_FALL (1 << 3) // latch rx data on falling edge of SCLK + +uint32_t spi_transact(bool readback, int slave, uint32_t data, int length, uint32_t flags); + +#endif /* INCLUDED_SPI_H */ |