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em9304: enforce 4-byte alignment on SPI operations

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This commit is contained in:
Matthias Ringwald 2017-12-20 14:52:47 +01:00
parent fc46bba0b0
commit 24b2b71b6f
1 changed files with 18 additions and 9 deletions
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27
src/hci_transport_em9304_spi.c
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@ -58,8 +58,7 @@ static void em9304_spi_engine_run(void);
#define EM9304_SPI_HEADER_TX 0x42
#define EM9304_SPI_HEADER_RX 0x81
#define SPI_EM9304_RX_BUFFER_SIZE 64
#define SPI_EM9304_TX_BUFFER_SIZE 64
#define SPI_EM9304_BUFFER_SIZE 64
#define SPI_EM9304_RING_BUFFER_SIZE 128
// state
@ -86,6 +85,8 @@ static uint16_t em9304_spi_engine_rx_request_len;
static uint16_t em9304_spi_engine_tx_request_len;
static btstack_ring_buffer_t em9304_spi_engine_rx_ring_buffer;
// note: needs to be aligned
static uint8_t em9304_spi_engine_rx_ring_buffer_storage[SPI_EM9304_RING_BUFFER_SIZE];
static const uint8_t * em9304_spi_engine_tx_data;
@ -107,9 +108,9 @@ union {
} sStas;
union {
uint32_t words[SPI_EM9304_RX_BUFFER_SIZE/4];
uint8_t bytes[SPI_EM9304_RX_BUFFER_SIZE];
} em9304_spi_engine_spi_rx_buffer;
uint32_t words[SPI_EM9304_BUFFER_SIZE/4];
uint8_t bytes[SPI_EM9304_BUFFER_SIZE];
} em9304_spi_engine_spi_buffer;
static void em9304_spi_engine_ready_callback(void){
// TODO: collect states
@ -154,7 +155,7 @@ static void em9304_spi_engine_start_tx_transaction(void){
}
static inline int em9304_engine_space_in_rx_buffer(void){
return btstack_ring_buffer_bytes_free(&em9304_spi_engine_rx_ring_buffer) >= SPI_EM9304_RX_BUFFER_SIZE;
return btstack_ring_buffer_bytes_free(&em9304_spi_engine_rx_ring_buffer) >= SPI_EM9304_BUFFER_SIZE;
}
static void em9304_engine_receive_buffer_ready(void){
@ -210,7 +211,7 @@ static void em9304_spi_engine_run(void){
// read data
em9304_spi_engine_state = SPI_EM9304_RX_W4_DATA_RECEIVED;
em9304_spi_engine_rx_request_len = sStas.bytes[0];
btstack_em9304_spi->receive(em9304_spi_engine_spi_rx_buffer.bytes, em9304_spi_engine_rx_request_len);
btstack_em9304_spi->receive(em9304_spi_engine_spi_buffer.bytes, em9304_spi_engine_rx_request_len);
break;
case SPI_EM9304_RX_DATA_RECEIVED:
@ -218,7 +219,7 @@ static void em9304_spi_engine_run(void){
em9304_engine_action_done();
// move data into ring buffer
btstack_ring_buffer_write(&em9304_spi_engine_rx_ring_buffer, em9304_spi_engine_spi_rx_buffer.bytes, em9304_spi_engine_rx_request_len);
btstack_ring_buffer_write(&em9304_spi_engine_rx_ring_buffer, em9304_spi_engine_spi_buffer.bytes, em9304_spi_engine_rx_request_len);
em9304_spi_engine_rx_request_len = 0;
// notify about new data available -- assume empty
@ -263,7 +264,15 @@ static void em9304_spi_engine_run(void){
// send command
em9304_spi_engine_state = SPI_EM9304_TX_W4_DATA_SENT;
btstack_em9304_spi->transmit( (uint8_t*) em9304_spi_engine_tx_data, em9304_spi_engine_tx_request_len);
if ( (((uintptr_t) em9304_spi_engine_tx_data) & 0x03) == 0){
// 4-byte aligned
btstack_em9304_spi->transmit( (uint8_t*) em9304_spi_engine_tx_data, em9304_spi_engine_tx_request_len);
} else {
// TODO: get rid of alignment requirement
// enforce alignment by copying to spi buffer first
memcpy(em9304_spi_engine_spi_buffer.bytes, em9304_spi_engine_tx_data, em9304_spi_engine_tx_request_len);
btstack_em9304_spi->transmit( (uint8_t*) em9304_spi_engine_spi_buffer.bytes, em9304_spi_engine_tx_request_len);
}
break;
case SPI_EM9304_TX_DATA_SENT: