diff options
Diffstat (limited to 'firmware/microblaze/lib')
-rw-r--r-- | firmware/microblaze/lib/spi.c | 41 | ||||
-rw-r--r-- | firmware/microblaze/lib/spi.h | 7 |
2 files changed, 48 insertions, 0 deletions
diff --git a/firmware/microblaze/lib/spi.c b/firmware/microblaze/lib/spi.c index bef808e57..4371b9b8a 100644 --- a/firmware/microblaze/lib/spi.c +++ b/firmware/microblaze/lib/spi.c @@ -17,6 +17,9 @@ #include "spi.h" #include "memory_map.h" +#include "nonstdio.h" + +void (*volatile spi_callback)(void); //SPI callback when xfer complete. void spi_init(void) @@ -59,3 +62,41 @@ spi_transact(bool readback, int slave, uint32_t data, int length, uint32_t flags else return 0; } + +void spi_register_callback(void (*volatile callback)(void)) { + spi_callback = callback; +} + +void spi_irq_handler(void) { + printf("SPI IRQ handler\n"); + if(spi_callback) spi_callback(); //we could just use the PIC to register the user's callback, but this provides the ability to do other things later +} + +uint32_t spi_get_data(void) { + return spi_regs->txrx0; +} + +bool +spi_async_transact(int slave, uint32_t data, int length, uint32_t flags, void (*volatile callback)(void)) { + flags &= (SPI_CTRL_TXNEG | SPI_CTRL_RXNEG); + int ctrl = SPI_CTRL_ASS | (SPI_CTRL_CHAR_LEN_MASK & length) | flags; + + if(spi_regs->ctrl & SPI_CTRL_GO_BSY) return false; //we don't wait on busy, we just return failure. + + // Tell it which SPI slave device to access + spi_regs->ss = slave & 0xffff; + + // Data we will send + spi_regs->txrx0 = data; + + // Run it -- write once and rewrite with GO set + spi_regs->ctrl = ctrl; + spi_regs->ctrl = ctrl | SPI_CTRL_GO_BSY; + + spi_regs->ctrl |= SPI_CTRL_IE; //we do these here so that we don't have to start the PIC before the SPI sets up the clocks on startup + pic_register_handler(IRQ_SPI, spi_irq_handler); + + spi_register_callback(callback); + + return true; +} diff --git a/firmware/microblaze/lib/spi.h b/firmware/microblaze/lib/spi.h index 01e4d26fd..18699f21a 100644 --- a/firmware/microblaze/lib/spi.h +++ b/firmware/microblaze/lib/spi.h @@ -48,6 +48,13 @@ void spi_wait(void); uint32_t spi_transact(bool readback, int slave, uint32_t data, int length, uint32_t flags); +bool +spi_async_transact(int slave, uint32_t data, int length, uint32_t flags, void (*volatile callback)(void)); + +uint32_t spi_get_data(void); +void spi_irq_handler(void); +void spi_register_callback(void (*volatile callback)(void)); + // ---------------------------------------------------------------- // Routines that manipulate the FLASH SPI BUS // ---------------------------------------------------------------- |