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SiLabs Pearl: SPI support for 9-16 bit long frames 

Added LDMA-transfer support for 9-16 bit long SPI-frames.
pull/1501/head
jhokajar 2015-11-24 08:56:00 +02:00 committed by Steven Cooreman
parent 838b0a6c56
commit 3e593439ae
1 changed files with 34 additions and 14 deletions
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48
libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/spi_api.c
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@ -853,18 +853,28 @@ static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int t
if( txdata ) {
volatile void *target_addr;
/* Select TX target address. 9 bit frame length requires to use extended register.
10 bit and larger frame requires to use TXDOUBLE register. */
switch((int)obj->spi.spi) {
case USART_0:
dma_periph = ldmaPeripheralSignal_USART0_TXBL;
target_addr = &USART0->TXDATA;
if(obj->spi.bits <= 8){
target_addr = &USART0->TXDATA;
}else if(obj->spi.bits == 9){
target_addr = USART0->TXDOUBLEX;
}else{
target_addr = &USART0->TXDOUBLE;
}
break;
case USART_1:
dma_periph = ldmaPeripheralSignal_USART1_TXBL;
target_addr = &USART1->TXDATA;
break;
case LEUART_0:
dma_periph = ldmaPeripheralSignal_LEUART0_TXBL;
target_addr = &LEUART0->TXDATA;
if(obj->spi.bits <= 8){
target_addr = &USART1->TXDATA;
}else if(obj->spi.bits == 9){
target_addr = &USART1->TXDATAX;
}else{
target_addr = &USART1->TXDOUBLE;
}
break;
default:
EFM_ASSERT(0);
@ -872,6 +882,7 @@ static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int t
break;
}
/* Check the transmit lenght, and split long transfers to smaller ones*/
int max_length = 1024;
#ifdef _LDMA_CH_CTRL_XFERCNT_MASK
max_length = (_LDMA_CH_CTRL_XFERCNT_MASK>>_LDMA_CH_CTRL_XFERCNT_SHIFT)+1;
@ -890,19 +901,28 @@ static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int t
}
if(rxdata) {
volatile const void *source_addr;
/* Select RX source address. 9 bit frame length requires to use extended register.
10 bit and larger frame requires to use RXDOUBLE register. */
switch((int)obj->spi.spi) {
case USART_0:
dma_periph = ldmaPeripheralSignal_USART0_RXDATAV;
source_addr = &USART0->RXDATA;
if(obj->spi.bits <= 8){
source_addr = &USART0->RXDATA;
}else if(obj->spi.bits == 9){
source_addr = &USART0->RXDATAX;
}else{
source_addr = &USART0->RXDOUBLE;
}
break;
case USART_1:
dma_periph = ldmaPeripheralSignal_USART1_RXDATAV;
source_addr = &USART1->RXDATA;
break;
case LEUART_0:
dma_periph = ldmaPeripheralSignal_LEUART0_RXDATAV;
source_addr = &LEUART0->RXDATA;
if(obj->spi.bits <= 8){
source_addr = &USART1->RXDATA;
}else if(obj->spi.bits == 9){
source_addr = &USART1->RXDATAX;
}else{
source_addr = &USART1->RXDOUBLE;
}
break;
default:
EFM_ASSERT(0);
@ -912,7 +932,7 @@ 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_P2M_BYTE(source_addr, rxdata, rx_length);
LDMA_StartTransfer(obj->spi.dmaOptionsRX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete,obj->spi.dmaOptionsRX.dmaCallback.userPtr); // obj->spi.dmaOptionsTX.dmaCallback JJH
LDMA_StartTransfer(obj->spi.dmaOptionsRX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete,obj->spi.dmaOptionsRX.dmaCallback.userPtr);
}
}