altos/stm: Note that ao_i2c_recv_dma_isr isn't actually used

[fw/altos] / src / stm / ao_i2c_stm.c

diff --git a/src/stm/ao_i2c_stm.c b/src/stm/ao_i2c_stm.c
index 158f5b218ebfe0edd877b4049322fb11b51f18fd..c02bc5a535169f0922b638f4947756c8d5133256 100644 (file)
--- a/src/stm/ao_i2c_stm.c
+++ b/src/stm/ao_i2c_stm.c
@@ -3,7 +3,8 @@
  *
  * 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; version 2 of the License.
+ * the Free Software Foundation; either version 2 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
@@ -74,6 +75,9 @@ uint8_t       ao_i2c_mutex[STM_NUM_I2C];
 #if AO_PCLK1 == 16000000
 # define AO_STM_I2C_CR2_FREQ   STM_I2C_CR2_FREQ_16_MHZ
 #endif
+#if AO_PCLK1 == 24000000
+# define AO_STM_I2C_CR2_FREQ   STM_I2C_CR2_FREQ_24_MHZ
+#endif
 #if AO_PCLK1 == 32000000
 # define AO_STM_I2C_CR2_FREQ   STM_I2C_CR2_FREQ_32_MHZ
 #endif
@@ -137,7 +141,7 @@ ao_i2c_ev_isr(uint8_t index)
                ao_wakeup(&ao_i2c_state[index]);
        }
        if (sr1 & (1 << STM_I2C_SR1_RXNE)) {
-               if (ao_i2c_recv_len[index]) {                   
+               if (ao_i2c_recv_len[index]) {
                        *(ao_i2c_recv_data[index]++) = stm_i2c->dr;
                        if (!--ao_i2c_recv_len[index])
                                ao_wakeup(&ao_i2c_recv_len[index]);
@@ -254,7 +258,7 @@ ao_i2c_send(void *block, uint16_t len, uint8_t index, uint8_t stop)
                            (0 << STM_DMA_CCR_PINC) |
                            (0 << STM_DMA_CCR_CIRC) |
                            (STM_DMA_CCR_DIR_MEM_TO_PER << STM_DMA_CCR_DIR));
-                          
+
        ao_dma_start(tx_dma_index);
        ao_arch_block_interrupts();
        while (!ao_dma_done[tx_dma_index])
@@ -271,7 +275,7 @@ ao_i2c_send(void *block, uint16_t len, uint8_t index, uint8_t stop)
                stm_i2c->cr1 = AO_STM_I2C_CR1 | (1 << STM_I2C_CR1_STOP);
                ao_i2c_wait_stop(index);
        }
-       return TRUE;
+       return true;
 }
 
 void
@@ -296,10 +300,10 @@ uint8_t
 ao_i2c_recv(void *block, uint16_t len, uint8_t index, uint8_t stop)
 {
        struct stm_i2c  *stm_i2c = ao_i2c_stm_info[index].stm_i2c;
-       uint8_t         ret = TRUE;
+       uint8_t         ret = true;
 
        if (len == 0)
-               return TRUE;
+               return true;
        if (len == 1) {
                ao_i2c_recv_data[index] = block;
                ao_i2c_recv_len[index] = 1;
@@ -330,13 +334,24 @@ ao_i2c_recv(void *block, uint16_t len, uint8_t index, uint8_t stop)
                                    block,
                                    len,
                                    (0 << STM_DMA_CCR_MEM2MEM) |
-                                   (STM_DMA_CCR_PL_MEDIUM << STM_DMA_CCR_PL) |
+                                   (STM_DMA_CCR_PL_HIGH << STM_DMA_CCR_PL) |
                                    (STM_DMA_CCR_MSIZE_8 << STM_DMA_CCR_MSIZE) |
                                    (STM_DMA_CCR_PSIZE_8 << STM_DMA_CCR_PSIZE) |
                                    (1 << STM_DMA_CCR_MINC) |
                                    (0 << STM_DMA_CCR_PINC) |
                                    (0 << STM_DMA_CCR_CIRC) |
                                    (STM_DMA_CCR_DIR_PER_TO_MEM << STM_DMA_CCR_DIR));
+
+               /* XXX ao_i2c_recv_dma_isr hasn't ever been used, so it
+                * doesn't appear to be necessary. Testing with a device
+                * that uses i2c would really be useful here to discover
+                * whether this function is necessary or not.
+                */
+#if 0
+               ao_dma_set_isr(rx_dma_index, ao_i2c_recv_dma_isr);
+#else
+               (void) ao_i2c_recv_dma_isr;
+#endif
                stm_i2c->cr1 = AO_STM_I2C_CR1 | (1 << STM_I2C_CR1_ACK);
                stm_i2c->cr2 = AO_STM_I2C_CR2 |
                        (1 << STM_I2C_CR2_DMAEN) | (1 << STM_I2C_CR2_LAST);