Functions | |
void | spi_pulse_0 () |
SPI test routine. | |
void | spi_pulse_1 () |
SPI test routine. | |
void | spi_setup () |
Setup ports and pins for SPI output. | |
void | spi_write (uns8 data) |
Send a byte of data using software spi. | |
void | spi_write_lsb (uns8 data) |
Send a byte of data using software spi. | |
void | spi_write_sure (uns8 data) |
SPI write for Sure devices. |
void spi_pulse_0 | ( | ) |
00090 { 00091 change_pin(spi_data_port, spi_data_pin, 0); 00092 clear_pin(spi_clk_port, spi_clk_pin); 00093 set_pin(spi_clk_port, spi_clk_pin); 00094 }
void spi_pulse_1 | ( | ) |
00096 { 00097 change_pin(spi_data_port, spi_data_pin, 1); 00098 clear_pin(spi_clk_port, spi_clk_pin); 00099 set_pin(spi_clk_port, spi_clk_pin); / 00100 }
void spi_setup | ( | ) |
void spi_write | ( | uns8 | data | ) |
Sends a byte of data MSB first, data only changes on clock low
00041 { 00042 00043 uns8 count; 00044 for (count = 0; count < 8; count++) { 00045 clear_pin(spi_clk_port, spi_clk_pin); // set to low 00046 change_pin(spi_data_port, spi_data_pin, data.7); 00047 data = data << 1; 00048 set_pin(spi_clk_port, spi_clk_pin); // set to low 00049 } 00050 00051 }
void spi_write_lsb | ( | uns8 | data | ) |
Sends a byte of data LSB first, data only changes on clock low
00055 { 00056 00057 uns8 count; 00058 00059 00060 for (count = 0; count < 8; count++) { 00061 clear_pin(spi_clk_port, spi_clk_pin); // set to low 00062 change_pin(spi_data_port, spi_data_pin, data.0); 00063 data = data >> 1; 00064 set_pin(spi_clk_port, spi_clk_pin); // set to low 00065 } 00066 00067 }
void spi_write_sure | ( | uns8 | data | ) |
SPI write byte for Sure devices. Sure devices do things a little differently. Data goes LSB first but data changes on clock high.
00075 { 00076 00077 uns8 count; 00078 uns8 data_in; 00079 00080 data_in = data; 00081 for (count = 0; count < 8; count++) { 00082 change_pin(spi_data_port, spi_data_pin, data_in.0); 00083 clear_pin(spi_clk_port, spi_clk_pin); 00084 set_pin(spi_clk_port, spi_clk_pin); 00085 data_in = data_in >> 1; 00086 } 00087 }