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SiLabs Pearl: More SPI fixes for 9-16 bit frames 

spi_buffer_tx_write fixed to work correctly with 9-16 bit frames,
if transfer length > 1. If frame is 9-16 bit client can use uint16_t or
uint32_t buffer for data storage, spi_api's default is to use uint16_t.

Added precompiler condition USE_UINT16_BUFFER to change assumption for
DMA and IRQ -transfers.
pull/1501/head
jhokajar 2015-12-01 10:29:36 +02:00 committed by Steven Cooreman
parent 6bb98769b0
commit 0dfca1ad86
1 changed files with 33 additions and 44 deletions
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49
libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/spi_api.c
View File

@ -51,6 +51,8 @@
static uint16_t fill_word = SPI_FILL_WORD;
#define SPI_LEAST_ACTIVE_SLEEPMODE EM0
#define USE_UINT16_BUFFER
static inline CMU_Clock_TypeDef spi_get_clock_tree(spi_t *obj)
{
switch ((int)obj->spi.spi) {
@ -488,19 +490,25 @@ void spi_buffer_set(spi_t *obj, const void *tx, uint32_t tx_length, void *rx, ui
static void spi_buffer_tx_write(spi_t *obj)
{
uint32_t data;
// This routine gets triggered on TXBL (= buffer empty), so check to see if we can write a double value
if (obj->spi.bits % 9 != 0) {
// No special 9-bit scenario
if((obj->tx_buff.pos < obj->tx_buff.length - 1) && ((obj->tx_buff.pos & 0x1) == 0)) {
if(obj->spi.bits >= 9) {
// write double frame
if (obj->tx_buff.buffer == (void *)0) {
data = SPI_FILL_WORD;
} else {
#ifdef USE_UINT16_BUFFER
uint16_t *tx = (uint16_t *)(obj->tx_buff.buffer);
data = tx[obj->tx_buff.pos / 2] & 0xFFFF;
#else
uint32_t *tx = (uint16_t *)(obj->tx_buff.buffer);
#endif
data = tx[obj->tx_buff.pos] & 0xFFFF;
}
obj->tx_buff.pos += 2;
obj->tx_buff.pos += 1;
if(obj->spi.bits == 9){
obj->spi.spi->TXDATAX = data;
}else {
obj->spi.spi->TXDOUBLE = data;
}
} else if (obj->tx_buff.pos < obj->tx_buff.length) {
// write single frame
if (obj->tx_buff.buffer == (void *)0) {
@ -510,32 +518,9 @@ static void spi_buffer_tx_write(spi_t *obj)
data = tx[obj->tx_buff.pos] & 0xFF;
}
obj->tx_buff.pos++;
obj->spi.spi->TXDATA = data;
}
} else {
// 9-bit frame
if(obj->tx_buff.pos < obj->tx_buff.length - 3) {
// write double frame
if (obj->tx_buff.buffer == (void *)0) {
data = ((SPI_FILL_WORD & 0x01FF) << 16) | (SPI_FILL_WORD & 0x1FF);
} else {
uint32_t *tx = (uint32_t *)(obj->tx_buff.buffer);
data = tx[obj->tx_buff.pos / 4] & 0x01FF01FF;
}
obj->tx_buff.pos += 4;
obj->spi.spi->TXDOUBLEX = data;
} else if (obj->tx_buff.pos < obj->tx_buff.length - 1) {
// write single frame
if (obj->tx_buff.buffer == (void *)0) {
data = SPI_FILL_WORD & 0x01FF;
} else {
uint16_t *tx = (uint16_t *)(obj->tx_buff.buffer);
data = tx[obj->tx_buff.pos / 2] & 0x01FF;
}
obj->tx_buff.pos += 2;
obj->spi.spi->TXDATAX = data;
}
}
}
static void spi_buffer_rx_read(spi_t *obj)
@ -897,8 +882,12 @@ static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int t
LDMA_TransferCfg_t xferConf = LDMA_TRANSFER_CFG_PERIPHERAL(dma_periph);
LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_M2P_BYTE(txdata, target_addr, tx_length);
if(obj->spi.bits >= 9){
#ifdef USE_UINT16_BUFFER
desc.xfer.size = ldmaCtrlSizeHalf;
#else
desc.xfer.size = ldmaCtrlSizeHalf;
desc.xfer.srcInc = ldmaCtrlSrcIncTwo;
#endif
}
LDMA_StartTransfer(obj->spi.dmaOptionsTX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete,obj->spi.dmaOptionsRX.dmaCallback.userPtr);