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st7565.c: Move wait and data write to a single function.

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This makes the code much easier to follow and understand.
This commit is contained in:
Wouter van Gulik 2023-10-06 14:02:34 +02:00
parent f494b8565b
commit b087ed5502
1 changed files with 16 additions and 18 deletions
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34
driver/st7565.c
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@ -32,6 +32,13 @@ uint8_t g_frame_buffer[7][128];
uint8_t contrast = 31; // 0 ~ 63 uint8_t contrast = 31; // 0 ~ 63
#endif #endif
static inline void ST7565_LowLevelWrite(uint8_t Value)
{
/* Wait for space in the fifo */
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {}
SPI0->WDR = Value;
}
void ST7565_DrawLine(const unsigned int Column, const unsigned int Line, const unsigned int Size, const uint8_t *pBitmap) void ST7565_DrawLine(const unsigned int Column, const unsigned int Line, const unsigned int Size, const uint8_t *pBitmap)
{ {
unsigned int i; unsigned int i;
@ -46,16 +53,14 @@ void ST7565_DrawLine(const unsigned int Column, const unsigned int Line, const u
{ {
for (i = 0; i < Size; i++) for (i = 0; i < Size; i++)
{ {
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite(pBitmap[i]);
SPI0->WDR = pBitmap[i];
} }
} }
else else
{ {
for (i = 0; i < Size; i++) for (i = 0; i < Size; i++)
{ {
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite(0);
SPI0->WDR = 0;
} }
} }
@ -83,8 +88,7 @@ void ST7565_BlitFullScreen(void)
GPIO_SetBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0); GPIO_SetBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0);
for (Column = 0; Column < ARRAY_SIZE(g_frame_buffer[0]); Column++) for (Column = 0; Column < ARRAY_SIZE(g_frame_buffer[0]); Column++)
{ {
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite(g_frame_buffer[Line][Column]);
SPI0->WDR = g_frame_buffer[Line][Column];
} }
SPI_WaitForUndocumentedTxFifoStatusBit(); SPI_WaitForUndocumentedTxFifoStatusBit();
} }
@ -114,8 +118,7 @@ void ST7565_BlitStatusLine(void)
for (i = 0; i < ARRAY_SIZE(g_status_line); i++) for (i = 0; i < ARRAY_SIZE(g_status_line); i++)
{ {
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite(g_status_line[i]);
SPI0->WDR = g_status_line[i];
} }
SPI_WaitForUndocumentedTxFifoStatusBit(); SPI_WaitForUndocumentedTxFifoStatusBit();
@ -140,8 +143,7 @@ void ST7565_FillScreen(const uint8_t Value)
GPIO_SetBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0); GPIO_SetBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0);
for (j = 0; j < 132; j++) for (j = 0; j < 132; j++)
{ {
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite(Value);
SPI0->WDR = Value;
} }
SPI_WaitForUndocumentedTxFifoStatusBit(); SPI_WaitForUndocumentedTxFifoStatusBit();
} }
@ -226,20 +228,16 @@ void ST7565_HardwareReset(void)
void ST7565_SelectColumnAndLine(const uint8_t Column, const uint8_t Line) void ST7565_SelectColumnAndLine(const uint8_t Column, const uint8_t Line)
{ {
GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0); GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0);
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite(Line + 176);
SPI0->WDR = Line + 176; ST7565_LowLevelWrite(((Column >> 4) & 0x0F) | 0x10);
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite((Column >> 0) & 0x0F);
SPI0->WDR = ((Column >> 4) & 0x0F) | 0x10;
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {}
SPI0->WDR = ((Column >> 0) & 0x0F);
SPI_WaitForUndocumentedTxFifoStatusBit(); SPI_WaitForUndocumentedTxFifoStatusBit();
} }
void ST7565_WriteByte(const uint8_t Value) void ST7565_WriteByte(const uint8_t Value)
{ {
GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0); GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_ST7565_A0);
while ((SPI0->FIFOST & SPI_FIFOST_TFF_MASK) != SPI_FIFOST_TFF_BITS_NOT_FULL) {} ST7565_LowLevelWrite(Value);
SPI0->WDR = Value;
} }
#ifdef ENABLE_CONTRAST #ifdef ENABLE_CONTRAST