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Work in progress, updated test tool to only read and prototyped firmware to continuously write to the TX buffer. Firmware still needs work, this was only done to understand how the pico usb core works.

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This commit is contained in:
Mickey Malone
2021-02-09 07:05:45 -06:00
parent c8e1023366
commit b1eb887656
2 changed files with 66 additions and 40 deletions
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38
firmware/pico_rng.c
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@@ -578,10 +578,38 @@ void ep1_out_handler(uint8_t *buf, uint16_t len) {
usb_start_transfer(ep, (char*)new_buf, size);
}
void get_random_data(char *buffer, uint16_t len) {
uint16_t adc_result;
uint8_t size;
int i;
gpio_put(25, 1);
if(len > 64)
{
//TODO handle length error
size = 64;
}
memset(buffer, 0, len);
for(i = 1; i <= len; i=i+1)
{
adc_result = adc_read();
memcpy(&buffer[i-1], (void*)&adc_result, 2);
}
gpio_put(25, 0);
}
void ep2_in_handler(uint8_t *buf, uint16_t len) {
printf("Sent %d bytes to host\n", len);
// Get ready to rx again from host
usb_start_transfer(usb_get_endpoint_configuration(EP1_OUT_ADDR), NULL, 64);
char buffer[64];
get_random_data(buffer, 64);
//usb_start_transfer(usb_get_endpoint_configuration(EP1_OUT_ADDR), NULL, 64);
struct usb_endpoint_configuration *ep = usb_get_endpoint_configuration(EP2_IN_ADDR);
usb_start_transfer(ep, buffer, 64);
}
int main(void) {
@@ -604,8 +632,12 @@ int main(void) {
tight_loop_contents();
}
// Get ready to rx from host
usb_start_transfer(usb_get_endpoint_configuration(EP1_OUT_ADDR), NULL, 64);
char buffer[64];
// Get ready to tx
get_random_data(buffer, 64);
usb_start_transfer(usb_get_endpoint_configuration(EP2_IN_ADDR), buffer, 64);
//usb_start_transfer(usb_get_endpoint_configuration(EP1_OUT_ADDR), NULL, 64);
// Everything is interrupt driven so just loop here
while (1) {