diff options
Diffstat (limited to 'chip/g/sps.c')
| -rw-r--r-- | chip/g/sps.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/chip/g/sps.c b/chip/g/sps.c index fc7a0d8458..6a78c5f7d5 100644 --- a/chip/g/sps.c +++ b/chip/g/sps.c @@ -60,6 +60,9 @@ static uint32_t sps_tx_count, sps_rx_count, tx_empty_count, max_rx_batch; #define CPUTS(outstr) cputs(CC_SPS, outstr) #define CPRINTS(format, args...) cprints(CC_SPS, format, ## args) +/* Flag indicating if there has been any data received while CS was asserted. */ +static uint8_t seen_data; + void sps_tx_status(uint8_t byte) { GREG32(SPS, DUMMY_WORD) = byte; @@ -198,6 +201,8 @@ static void sps_configure(enum sps_mode mode, enum spi_clock_mode clk_mode, GWRITE_FIELD(SPS, ICTRL, RXFIFO_LVL, 1); + seen_data = 0; + /* Use CS_DEASSERT to retrieve all remaining bytes from RX FIFO. */ GWRITE_FIELD(SPS, ISTATE_CLR, CS_DEASSERT, 1); GWRITE_FIELD(SPS, ICTRL, CS_DEASSERT, 1); @@ -306,8 +311,6 @@ static void sps_advance_rx(int port, int data_size) */ static void sps_rx_interrupt(uint32_t port, int cs_deasserted) { - static uint8_t seen_data; - for (;;) { uint8_t *received_data = NULL; size_t data_size; @@ -329,14 +332,14 @@ static void sps_rx_interrupt(uint32_t port, int cs_deasserted) } if (cs_deasserted) { - sps_rx_handler(NULL, 0, 1); - if (seen_data) { /* * SPI does not provide inherent flow control. Let's * use this pin to signal the AP that the device has * finished processing received data. */ + + sps_rx_handler(NULL, 0, 1); gpio_set_level(GPIO_INT_AP_L, 0); gpio_set_level(GPIO_INT_AP_L, 1); seen_data = 0; |