Always keep clock high when idle

sd_tests/hardware_spi/hardware_spi.ino

@@ -21,6 +21,8 @@
 #include <avr/pgmspace.h>
 #include <util/delay.h>
 
+#include "tinySPI.h"        // https://github.com/JChristensen/tinySPI
+
 #define output(directions,pin) (directions |= pin) // set port direction for output
 #define input(directions,pin) (directions &= (~pin)) // set port direction for input
 #define set(port,pin) (port |= pin) // set port pin
@@ -193,6 +195,10 @@ void put_hex_string(uint8_t *string, uint16_t length) {
 // SPI_write
 //    write an SPI character and return the response
 //
+unsigned char SPI_write_hardware(uint8_t chr) {
+   return SPI.transfer(chr);
+}
+
 unsigned char SPI_write(uint8_t chr) {
    static unsigned char bit,ret;
    ret = 0;
@@ -352,11 +358,15 @@ void loop() {
    set(MOSI_port, MOSI_pin);
    set(CS_port, CS_pin);
    for (count = 0; count < 80; ++count) {
-      set(SCK_port,SCK_pin);
+      set(SCK_port, SCK_pin);
       SPI_delay();
-      clear(SCK_port,SCK_pin);
+      clear(SCK_port, SCK_pin);
       SPI_delay();
-      }
+   }
+   set(SCK_port, SCK_pin);
+
+   //SPI.begin();
+   //SPI.setDataMode(SPI_MODE1);
 
    //
    // CMD0: reset and enter idle state
@@ -575,5 +585,6 @@ void loop() {
       //
       }
    put_flash_string(PSTR("\r\n\r\nend of file\r\n"));
+   //SPI.end();
    led_port &= ~led_pin;
 }