diff options
| author | Keith Packard <keithp@keithp.com> | 2014-07-05 00:04:06 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2014-07-05 00:38:10 -0700 |
| commit | 292cb8380b478542555b5f370e8252eafa2f74ac (patch) | |
| tree | c596a045bf49faefe845e42539691db7adbca8cc /src/stm/ao_spi_stm.c | |
| parent | e0ee2ac6bc68b73e13bf34fac3ffd4a3b79dce98 (diff) | |
altos: Rework packet receive for cc1120
Instead of blocking on PQT, just set up the receiver to start going
and when the first bit interrupt comes in, grab the SPI bus if
possible and configure it for reception. This improves sensitivity in
the radio by a significant amount while making the code conceptually a
bit nicer.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src/stm/ao_spi_stm.c')
| -rw-r--r-- | src/stm/ao_spi_stm.c | 51 |
1 files changed, 45 insertions, 6 deletions
diff --git a/src/stm/ao_spi_stm.c b/src/stm/ao_spi_stm.c index 56329c24..885af544 100644 --- a/src/stm/ao_spi_stm.c +++ b/src/stm/ao_spi_stm.c @@ -154,6 +154,28 @@ ao_spi_send_fixed(uint8_t value, uint16_t len, uint8_t spi_index) } void +ao_spi_send_sync(void *block, uint16_t len, uint8_t spi_index) +{ + uint8_t *b = block; + struct stm_spi *stm_spi = ao_spi_stm_info[AO_SPI_INDEX(spi_index)].stm_spi; + + stm_spi->cr2 = ((0 << STM_SPI_CR2_TXEIE) | + (0 << STM_SPI_CR2_RXNEIE) | + (0 << STM_SPI_CR2_ERRIE) | + (0 << STM_SPI_CR2_SSOE) | + (0 << STM_SPI_CR2_TXDMAEN) | + (0 << STM_SPI_CR2_RXDMAEN)); + + /* Clear RXNE */ + (void) stm_spi->dr; + + while (len--) { + while (!(stm_spi->sr & (1 << STM_SPI_SR_TXE))); + stm_spi->dr = *b++; + } +} + +void ao_spi_recv(void *block, uint16_t len, uint8_t spi_index) { struct stm_spi *stm_spi = ao_spi_stm_info[AO_SPI_INDEX(spi_index)].stm_spi; @@ -356,13 +378,11 @@ ao_spi_enable_index(uint8_t spi_index) } } -void -ao_spi_get(uint8_t spi_index, uint32_t speed) +static void +ao_spi_config(uint8_t spi_index, uint32_t speed) { uint8_t id = AO_SPI_INDEX(spi_index); struct stm_spi *stm_spi = ao_spi_stm_info[id].stm_spi; - - ao_mutex_get(&ao_spi_mutex[id]); stm_spi->cr1 = ((0 << STM_SPI_CR1_BIDIMODE) | /* Three wire mode */ (0 << STM_SPI_CR1_BIDIOE) | (0 << STM_SPI_CR1_CRCEN) | /* CRC disabled */ @@ -378,7 +398,7 @@ ao_spi_get(uint8_t spi_index, uint32_t speed) (0 << STM_SPI_CR1_CPOL) | /* Format 0 */ (0 << STM_SPI_CR1_CPHA)); if (spi_index != ao_spi_index[id]) { - + /* Disable old config */ ao_spi_disable_index(ao_spi_index[id]); @@ -386,13 +406,32 @@ ao_spi_get(uint8_t spi_index, uint32_t speed) /* Enable new config */ ao_spi_enable_index(spi_index); - + /* Remember current config */ ao_spi_index[id] = spi_index; } } +uint8_t +ao_spi_try_get(uint8_t spi_index, uint32_t speed, uint8_t task_id) +{ + uint8_t id = AO_SPI_INDEX(spi_index); + + if (!ao_mutex_try(&ao_spi_mutex[id], task_id)) + return 0; + ao_spi_config(spi_index, speed); + return 1; +} + +void +ao_spi_get(uint8_t spi_index, uint32_t speed) +{ + uint8_t id = AO_SPI_INDEX(spi_index); + ao_mutex_get(&ao_spi_mutex[id]); + ao_spi_config(spi_index, speed); +} + void ao_spi_put(uint8_t spi_index) { |