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Improve SPI block write 

Replace looping construct with actual block writes.
pull/6202/head
Keyur Hariya 2018-02-02 10:51:07 -06:00
parent 8d778d5d8b
commit 80b0ae0d9e
1 changed files with 49 additions and 11 deletions
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60
targets/TARGET_Maxim/TARGET_MAX32625/spi_api.c
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@ -167,19 +167,58 @@ int spi_master_write(spi_t *obj, int value)
return *req.rx_data;
}
int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length,
char *rx_buffer, int rx_length, char write_fill) {
int total = (tx_length > rx_length) ? tx_length : rx_length;
//******************************************************************************
int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, char write_fill)
{
spim_req_t req;
for (int i = 0; i < total; i++) {
char out = (i < tx_length) ? tx_buffer[i] : write_fill;
char in = spi_master_write(obj, out);
if (i < rx_length) {
rx_buffer[i] = in;
}
if (!(tx_length | rx_length) ||
(tx_length < 0) ||
(rx_length < 0)) {
return 0;
}
return total;
req.width = SPIM_WIDTH_1;
req.ssel = 0;
req.deass = 1;
req.callback = NULL;
__disable_irq();
if (tx_length == rx_length) {
req.tx_data = (uint8_t *)tx_buffer;
req.rx_data = (uint8_t *)rx_buffer;
req.len = tx_length;
SPIM_Trans(obj->spi, &req);
} else if (tx_length < rx_length) {
req.tx_data = (tx_length > 0) ? (uint8_t *)tx_buffer : NULL;
req.rx_data = (uint8_t *)rx_buffer;
req.len = (tx_length > 0) ? tx_length : rx_length;
SPIM_Trans(obj->spi, &req);
if (tx_length) {
req.tx_data = NULL;
req.rx_data = (uint8_t *)(rx_buffer + tx_length);
req.len = rx_length - tx_length;
SPIM_Trans(obj->spi, &req);
}
} else {
req.tx_data = (uint8_t *)tx_buffer;
req.rx_data = (rx_length > 0) ? (uint8_t *)rx_buffer : NULL;
req.len = (rx_length > 0) ? rx_length : tx_length;
SPIM_Trans(obj->spi, &req);
if (rx_length) {
req.tx_data = (uint8_t *)(tx_buffer + rx_length);
req.rx_data = NULL;
req.len = tx_length - rx_length;
SPIM_Trans(obj->spi, &req);
}
}
__enable_irq();
while (SPIM_Busy(obj->spi));
return tx_length > rx_length ? tx_length : rx_length;
}
//******************************************************************************
@ -193,4 +232,3 @@ uint8_t spi_get_module(spi_t *obj)
{
return obj->index;
}