altos/lpc: Leave SPI enabled all the time

Might be able to turn it off with some care; more experimentation required.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/lpc/ao_spi_lpc.c b/src/lpc/ao_spi_lpc.c
index e7edca4c1a165e7a090339c20e7354d4ec75601c..7c830053d90557def4e3a104c89b397b1cea6355 100644 (file)
--- a/src/lpc/ao_spi_lpc.c
+++ b/src/lpc/ao_spi_lpc.c
@@ -89,24 +89,11 @@ ao_spi_get(uint8_t id, uint32_t speed)
        
        /* Set the clock prescale */
        lpc_ssp->cpsr = speed;
-
-       /* Enable the device */
-       lpc_ssp->cr1 = ((0 << LPC_SSP_CR1_LBM) |
-                       (1 << LPC_SSP_CR1_SSE) |
-                       (LPC_SSP_CR1_MS_MASTER << LPC_SSP_CR1_MS) |
-                       (0 << LPC_SSP_CR1_SOD));
 }
 
 void
 ao_spi_put(uint8_t id)
 {
-       struct lpc_ssp  *lpc_ssp = ao_lpc_ssp[id];
-
-       /* Disable the device */
-       lpc_ssp->cr1 = ((0 << LPC_SSP_CR1_LBM) |
-                       (0 << LPC_SSP_CR1_SSE) |
-                       (LPC_SSP_CR1_MS_MASTER << LPC_SSP_CR1_MS) |
-                       (0 << LPC_SSP_CR1_SOD));
        ao_mutex_put(&ao_spi_mutex[id]);
 }
 
@@ -121,6 +108,13 @@ ao_spi_channel_init(uint8_t id)
                        (0 << LPC_SSP_CR0_CPOL) |
                        (0 << LPC_SSP_CR0_CPHA) |
                        (0 << LPC_SSP_CR0_SCR));
+
+       /* Enable the device */
+       lpc_ssp->cr1 = ((0 << LPC_SSP_CR1_LBM) |
+                       (1 << LPC_SSP_CR1_SSE) |
+                       (LPC_SSP_CR1_MS_MASTER << LPC_SSP_CR1_MS) |
+                       (0 << LPC_SSP_CR1_SOD));
+
        /* Drain the receive fifo */
        for (d = 0; d < LPC_SSP_FIFOSIZE; d++)
                (void) lpc_ssp->dr;