+void
+ao_i2c_recv(void *block, uint16_t len, uint8_t index)
+{
+ struct stm_i2c *stm_i2c = ao_i2c_stm_info[index].stm_i2c;
+ uint8_t rx_dma_index = ao_i2c_stm_info[index].rx_dma_index;
+
+ stm_i2c->cr2 |= (1 << STM_I2C_CR2_LAST);
+ ao_dma_set_transfer(rx_dma_index,
+ &stm_i2c->dr,
+ block,
+ len,
+ (0 << STM_DMA_CCR_MEM2MEM) |
+ (STM_DMA_CCR_PL_MEDIUM << 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));
+
+ ao_dma_start(rx_dma_index);
+ cli();
+ while (!ao_dma_done[rx_dma_index])
+ ao_sleep(&ao_dma_done[rx_dma_index]);
+ sei();
+ ao_dma_done_transfer(rx_dma_index);
+}
+