bms.cpp

00001 
00002 #include "mbed.h"
00003 #include "bms.h"
00004 
00005 SPI spi(p5,p6,p7);
00006 DigitalOut cs(p8);
00007 
00008 void cs_low(void)
00009 {
00010     cs=0;
00011 }
00012 
00013 void cs_high(void)
00014 {
00015     cs=1;
00016 }
00017 
00018 void delay_u(uint16_t micro)
00019 {
00020     wait_us(micro);
00021 }
00022 
00023 void delay_m(uint16_t milli)
00024 {
00025     wait_ms(milli);
00026 }
00027 
00028 void spi_enable(void) // Configures SCK frequency. Use constant defined in header file.
00029 {
00030     cs = 1;                     //high as init for disable SPI
00031     spi.format(8, 3);               //byte width, spi mode
00032     spi.frequency(1000000);         //1MHz
00033 }
00034     
00035 
00036 /*
00037 Writes an array of bytes out of the SPI port
00038 */
00039 void spi_write_array(uint8_t len, // Option: Number of bytes to be written on the SPI port
00040                      uint8_t data[] //Array of bytes to be written on the SPI port
00041                     )
00042 {
00043     //cs=0;
00044     for (uint8_t i = 0; i < len; i++) {
00045         spi.write((int8_t)data[i]);
00046     }
00047     //cs=1;
00048 }
00049 
00050 /*
00051  Writes and read a set number of bytes using the SPI port.
00052 
00053 */
00054 
00055 void spi_write_read(uint8_t tx_Data[],//array of data to be written on SPI port
00056                     uint8_t tx_len, //length of the tx data arry
00057                     uint8_t *rx_data,//Input: array that will store the data read by the SPI port
00058                     uint8_t rx_len //Option: number of bytes to be read from the SPI port
00059                    )
00060 {
00061     //cs=0;
00062     for (uint8_t i = 0; i < tx_len; i++) {
00063         spi.write(tx_Data[i]);
00064     }
00065     //cs=1;
00066 
00067     //cs=0;
00068     for (uint8_t i = 0; i < rx_len; i++) {
00069 
00070         rx_data[i] = (uint8_t)spi.write(0xFF);
00071     }
00072     //cs=1;
00073 
00074 }
00075 
00076 
00077 uint8_t spi_read_byte(uint8_t tx_dat)
00078 {
00079     uint8_t data;
00080     //cs=0;
00081     data = (uint8_t)spi.write(0xFF);
00082     //cs=1;
00083     return(data);
00084 }