np_driver_spi.c

00001 /*
00002  * np_driver_spi.c
00003  *
00004  *  Created on: July 14, 2016
00005  *      Author: Alan.Lin
00006  *
00007  *  Copyright: NexPack Ltd.
00008  */
00009 
00010 #include "np_config.h"
00011 #include "spis.h"
00012 #include "np_driver_spi.h"
00013 #include "np_app_spi.h"
00014 
00015 int driver_spi_slave_initial(void){
00016     uint8_t spis_req_value = 0x10;
00017     //IO INITIAL
00018     MXC_IOMAN->spis_req = spis_req_value;
00019     //IO initial IS OK
00020     if(spis_req_value != MXC_IOMAN->spis_ack){
00021         return E_BUSY;
00022     }
00023     CLKMAN_SetClkScale((clkman_clk_t)(CLKMAN_CLK_SPIS), CLKMAN_SCALE_DIV_1);
00024 
00025     //spis function intial
00026     MXC_SPIS->gen_ctrl = 0;
00027     MXC_SPIS->gen_ctrl = (MXC_F_SPIS_GEN_CTRL_SPI_SLAVE_EN | MXC_F_SPIS_GEN_CTRL_TX_FIFO_EN |
00028                             MXC_F_SPIS_GEN_CTRL_RX_FIFO_EN |(0x01 << MXC_F_SPIS_GEN_CTRL_SPI_MODE_POS));
00029 
00030     MXC_SPIS_FIFO->tx_8[0] = '$';   //keep first TX byte of next communication is '$'.Meaningless on here
00031 
00032     MXC_SPIS->fifo_ctrl &= (~MXC_F_SPIS_FIFO_CTRL_RX_FIFO_AF_LVL);
00033     MXC_SPIS->fifo_ctrl |=  (0x0 << MXC_F_SPIS_FIFO_CTRL_RX_FIFO_AF_LVL_POS);
00034 
00035     MXC_SPIS->inten = MXC_F_SPIS_INTEN_RX_FIFO_AF;// | MXC_F_SPIS_INTEN_TX_FIFO_AE;
00036     NVIC_EnableIRQ(SPIS_IRQn);
00037 
00038     return E_NO_ERROR;
00039 }
00040 
00041 void np_driver_spis_put_byte_to_tx_buff(uint8_t t_tx_byte){
00042     MXC_SPIS_FIFO->tx_8[0] = t_tx_byte;
00043 }
00044 
00045 //------------------------interrupt function---------------------------------
00046 void SPIS_IRQHandler(void){
00047     uint32_t spis_int_flags = MXC_SPIS->intfl;
00048 
00049     if (spis_int_flags & MXC_F_SPIS_INTFL_RX_FIFO_AF) {
00050         // Check for data
00051         while(MXC_SPIS->fifo_stat & MXC_F_SPIS_FIFO_STAT_RX_FIFO_USED) {
00052             np_app_spis_message(MXC_SPIS_FIFO->rx_8[0]);
00053         }
00054         MXC_SPIS->intfl = MXC_F_SPIS_INTFL_RX_FIFO_AF;
00055     }
00056 }