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Simplify SPI code

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This commit is contained in:
Manuel Bleichenbacher 2018-10-22 12:57:49 +02:00
parent 2e351ada9a
commit ee08d2a3c1
2 changed files with 19 additions and 62 deletions
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75
src/hal/hal_esp32.c
View File

@ -133,50 +133,8 @@ s1_t hal_getRssiCal (void) {
// ----------------------------------------------------------------------------- // -----------------------------------------------------------------------------
// SPI // SPI
#define SPI_QUEUE_SIZE 4
#define SPI_NUM_TRX_SLOTS (SPI_QUEUE_SIZE + 1)
static spi_device_handle_t spi_handle; static spi_device_handle_t spi_handle;
static spi_transaction_t spi_trx_queue[SPI_NUM_TRX_SLOTS]; static spi_transaction_t spi_trx;
static int spi_trx_queue_head = 0;
static int spi_num_outstanding_trx = 0;
static spi_transaction_t* get_next_spi_trx_desc()
{
spi_transaction_t* trx = spi_trx_queue + spi_trx_queue_head;
memset(trx, 0, sizeof(spi_transaction_t));
return trx;
}
static void collect_spi_result()
{
int head = spi_trx_queue_head;
int tail = head - spi_num_outstanding_trx;
if (tail < 0)
tail += SPI_NUM_TRX_SLOTS;
spi_transaction_t* trx;
esp_err_t err = spi_device_get_trans_result(spi_handle, &trx, 100 / portTICK_PERIOD_MS);
ESP_ERROR_CHECK(err);
ASSERT(trx == spi_trx_queue + tail);
spi_num_outstanding_trx--;
}
static void submit_spi_trx()
{
if (spi_num_outstanding_trx >= SPI_QUEUE_SIZE)
collect_spi_result();
int head = spi_trx_queue_head;
esp_err_t err = spi_device_queue_trans(spi_handle, spi_trx_queue + head, 100 / portTICK_PERIOD_MS);
ESP_ERROR_CHECK(err);
spi_num_outstanding_trx++;
head++;
if (head >= SPI_NUM_TRX_SLOTS)
head = 0;
spi_trx_queue_head = head;
}
static void hal_spi_init() static void hal_spi_init()
{ {
@ -187,7 +145,7 @@ static void hal_spi_init()
.command_bits = 0, .command_bits = 0,
.address_bits = 8, .address_bits = 8,
.spics_io_num = lmic_pins.nss, .spics_io_num = lmic_pins.nss,
.queue_size = SPI_QUEUE_SIZE, .queue_size = 1,
.cs_ena_posttrans = 2 .cs_ena_posttrans = 2
}; };
@ -199,26 +157,25 @@ static void hal_spi_init()
void hal_spi_write(u1_t cmd, const u1_t *buf, int len) void hal_spi_write(u1_t cmd, const u1_t *buf, int len)
{ {
spi_transaction_t* trx = get_next_spi_trx_desc(); memset(&spi_trx, 0, sizeof(spi_trx));
trx->addr = cmd; spi_trx.addr = cmd;
trx->length = 8 * len; spi_trx.length = 8 * len;
trx->tx_buffer = buf; spi_trx.tx_buffer = buf;
submit_spi_trx(); esp_err_t err = spi_device_transmit(spi_handle, &spi_trx);
ESP_ERROR_CHECK(err);
} }
void hal_spi_read(u1_t cmd, u1_t *buf, int len) void hal_spi_read(u1_t cmd, u1_t *buf, int len)
{ {
memset(buf, 0, len); memset(buf, 0, len);
spi_transaction_t* trx = get_next_spi_trx_desc(); memset(&spi_trx, 0, sizeof(spi_trx));
trx->addr = cmd; spi_trx.addr = cmd;
trx->length = 8 * len; spi_trx.length = 8 * len;
trx->rxlength = 8 * len; spi_trx.rxlength = 8 * len;
trx->tx_buffer = buf; spi_trx.tx_buffer = buf;
trx->rx_buffer = buf; spi_trx.rx_buffer = buf;
submit_spi_trx(); esp_err_t err = spi_device_transmit(spi_handle, &spi_trx);
ESP_ERROR_CHECK(err);
while (spi_num_outstanding_trx > 0)
collect_spi_result();
} }
// ----------------------------------------------------------------------------- // -----------------------------------------------------------------------------

6
src/lmic/hal.h
View File

@ -61,14 +61,14 @@ void hal_pin_rst (u1_t val);
// BEGIN ttn-esp32 change // BEGIN ttn-esp32 change
// use higher level SPI functions // use higher level SPI functions
/* /*
* perform SPI write transaction with radio * Perform SPI write transaction with radio chip
* - write the command byte 'cmd' * - write the command byte 'cmd'
* - write 'len' bytes in 'buf' * - write 'len' bytes out of 'buf'
*/ */
void hal_spi_write(u1_t cmd, const u1_t* buf, int len); void hal_spi_write(u1_t cmd, const u1_t* buf, int len);
/* /*
* perform SPI read transaction with radio * Perform SPI read transaction with radio chip
* - write the command byte 'cmd' * - write the command byte 'cmd'
* - read 'len' bytes into 'buf' * - read 'len' bytes into 'buf'
*/ */