diff options
| author | Keith Packard <keithp@keithp.com> | 2012-08-05 12:17:25 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2012-08-05 12:17:25 -0700 |
| commit | 0f82021186565fda10df7893b95deae4a1f32778 (patch) | |
| tree | c0298ecdcb60a41a8a4246d4fd73a735b4212019 | |
| parent | 39594fdb3e30a1a25dd894c217e3d9d773bab972 (diff) | |
src/cc1111: Enable SPI slave mode
This is untested...
Signed-off-by: Keith Packard <keithp@keithp.com>
| -rw-r--r-- | src/cc1111/ao_spi.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/src/cc1111/ao_spi.c b/src/cc1111/ao_spi.c index 1bf5e155..88cff9dd 100644 --- a/src/cc1111/ao_spi.c +++ b/src/cc1111/ao_spi.c @@ -40,6 +40,7 @@ static __xdata uint8_t ao_spi_const; void ao_spi_send_bus(void __xdata *block, uint16_t len) __reentrant { +#if !AO_SPI_SLAVE ao_dma_set_transfer(ao_spi_dma_in_id, &U0DBUFXADDR, &ao_spi_const, @@ -50,7 +51,7 @@ ao_spi_send_bus(void __xdata *block, uint16_t len) __reentrant DMA_CFG1_SRCINC_0 | DMA_CFG1_DESTINC_0 | DMA_CFG1_PRIORITY_NORMAL); - +#endif ao_dma_set_transfer(ao_spi_dma_out_id, block, &U0DBUFXADDR, @@ -62,11 +63,18 @@ ao_spi_send_bus(void __xdata *block, uint16_t len) __reentrant DMA_CFG1_DESTINC_0 | DMA_CFG1_PRIORITY_NORMAL); +#if !AO_SPI_SLAVE ao_dma_start(ao_spi_dma_in_id); +#endif ao_dma_start(ao_spi_dma_out_id); ao_dma_trigger(ao_spi_dma_out_id); +#if AO_SPI_SLAVE + __critical while (!ao_spi_dma_out_done) + ao_sleep(&ao_spi_dma_out_done); +#else __critical while (!ao_spi_dma_in_done) ao_sleep(&ao_spi_dma_in_done); +#endif } /* Receive bytes over SPI. @@ -115,10 +123,19 @@ ao_spi_recv_bus(void __xdata *block, uint16_t len) __reentrant * MO P1_5 * MI P1_4 * CLK P1_3 + * CSS P1_2 * - * Chip select is the responsibility of the caller + * Chip select is the responsibility of the caller in master mode */ +#if AO_SPI_SLAVE +#define CSS (1 << 2) +#define UxCSR_DIRECTION UxCSR_SLAVE +#else +#define CSS 0 +#define UxCSR_DIRECTION UxCSR_MASTER +#endif + void ao_spi_init(void) { @@ -131,7 +148,7 @@ ao_spi_init(void) P2SEL = (P2SEL & ~P2SEL_PRI3P1_MASK) | P2SEL_PRI3P1_USART0; /* Make the SPI pins be controlled by the USART peripheral */ - P1SEL |= ((1 << 5) | (1 << 4) | (1 << 3)); + P1SEL |= ((1 << 5) | (1 << 4) | (1 << 3) | CSS); /* Set up OUT DMA */ ao_spi_dma_out_id = ao_dma_alloc(&ao_spi_dma_out_done); @@ -143,7 +160,7 @@ ao_spi_init(void) * * SPI master mode */ - U0CSR = (UxCSR_MODE_SPI | UxCSR_RE | UxCSR_MASTER); + U0CSR = (UxCSR_MODE_SPI | UxCSR_RE | UxCSR_DIRECTION); /* Set the baud rate and signal parameters * |